My Largest Water Rocket Yet

[@AirCommandRockets]

Great video! Looks like Gamma IV is flying pretty well. If you could push the pressure to 100-110psi I think you would get pretty nice performance. Happy to provide air at appropriate pressure if you bring it along to one of the NSWRA launches. :)

[@arro_rockets]

Thanks! Means a lot coming from you guys :) I definitely agree that adding a little more pressure will definitely have it flying better, I'll be sure to borrow some air at future NSWRA launches to save me the pumping!

[@thesovietguttercat3302]

Although I only spent a year or so making water rockets, I got the same impression that the psi was a little low. At 80psi it's struggling to get the weight of the rocket and water moving. If they were to stick at 80 I'd suggest they'd get a longer flight time from reducing the amount of water onboard. If they were to use a polyurethane like Sika 11FC and rough up the seams, the joints should be good for atleast 120psi.

[@CDRaff]

I have always described the sound of a drone as "a million angry wasps" and I'm glad to see that the bees agree.

[@ptonpc]

It never occurred to me that bees would think of a drone as sounding like a wasp.

[@olasod1]

During the late 80ies and 90ies we had plastic bottles in Sweden with thicker plastic. They was reused from by the soda manufacturers several times before they was classed as trash. They had the same threading as our scuba bottles. We hooked one up to our scuba compressor and it exploded at 50 bars (+700 psi). They were heavier but it would have been fun making a rocket like your with those bottles. A bit dangerous though 🤣👍🏼

[@musiqtee]

Tip from steam boiler pressure tests; Do the (over-) pressure test with water only. It’s incompressible, so no explosion on failure. If you can’t use a water (hydraulic type) piston pump, maybe try with 98% water in the rocket, and then pressurise as normal. A failure will produce a hefty water spray, but less of a dangerous explosion. Besides, a failure from water pressure alone will enable better “forensics”, as the pressure vessel is way more intact after failing. Great work anyway, just thinking out loud here…😊👍

[@larrybremer4930]

I so agree with you. Those bottles are very dangerous when containing pressure. People have been maimed and killed by blowing up those bottles by sealing dry ice in them.

[@matthewferos]

How we pressure test PE pipe as well.

[@1943L]

This reminds me of a water rocket I was bought for my birthday when I was a teenager. Super idea you have developed.

[@dannyneumann4547]

Your channel has the coolest background music of any DIY channel I've seen

[@arro_rockets]

Thank you!

[@abcdefg4570]

Nice build! I used to make these a couple of years ago. I found that a good pressure is around 8-9bar for plastic bottles spliced like this, although they handled upwards of 11 bar. I used polyurethane construction glue, (sikabond t2). In the beginning, I had exactly this same issue of the rocket not having enough power, as I put way too little pressure into it. Just like some others mentioned, increase the pressure, and it should work! I designed and 3d printed both 8mm gardena-type nozzles, as well as using the 22 or something mm hole in the bottle. Both worked, but the larger hole made it go slightly higher, although it didn't look as cool. I am lucky to still have my eyesight, as 16-year-old me did not believe in safety goggles, and stood a half a meter from the rockets, releasing the firing mechanism with my fingers..

[@Alan_Hans__]

Very nice. I'd suggest wearing earplugs or earmuffs and safety goggles when pumping up the bottles from so close. The bang when bottles let go is a very serious bang.

[@arro_rockets]

Agreed! Goggles were one of the things I intended to have but unfortunately left behind on the day! That said I kept the rocket pressurised to a relatively low pressure because of my proximity to it and because I was confident it was not going to blow at that pressure

[@missyandmartinbakalorz1725]

I used to experiment with these when I was younger. Mainly ones I bought, but one or two (much smaller, just one bottle) I built as well. Had a 2 stage one I bought as well, loved that one. Years later I came up with a 1.5 stage design that I never got around to building. Concept is this: Stage 1 (the sustainer stage) is basically like your Gamma IV, it could even be a bit taller containing more water/air since it doesn't even need a thrust to weight ratio of over 1 at launch. Stage 0.5 (the boost stage) is a cluster of 3 to 6 bottles that are optimized for high thrust and thrust to weight, but short duration. So, the booster stage is very short height (only 1 or 2 bottles tall, each bottle same diameter as sustainer stage , and no (or as minimal as possible) restrictors on the nozzles, free flowing. Tying it all together is a base plate that holds the boost stage bottles together in a ring around the sustainer. The bottom of the sustainer stage rests in a cradle/hole in the base plate, and the fins of the sustainer stage stick out between the bottles of the boosters. The launch pad will need to be more complex, since starting/releasing all rockets at exactly the same time is critical. guessing some sort of similar system to what you use, but with spring loading that pulls all cords at once. When launched, the boosters accelerate the entire assembly rapidly off the pad, but run out of water only 10 to 50 feet off the ground. (the sustainer stage is also spraying the entire time from launch, but since it has a more restricted nozzle and contains much more water, its contribution to the thrust at launch is minimal, and it is only 10 to 20 percent depleted when the boosters run out) At that point, the booster falls away since it is no longer powered, and the lower but continued thrust of the sustainer stage is enough to pull it away from the booster assembly. and it continues on independently.

[@CRVcomponents]

Noce launches, can’t wait to see the improvements. And that poor drone was crazy.

[@arro_rockets]

Thank you! Thats the second time a drone has been victim to the bees (or vice versa). Any ideas of what you'd like to see with water rockets?

[@ВячеславЯницкий]

наш живчик

[@magnusalsuedi]

I would recommend using eye and ear protection when pressurising spliced bottles (probably any bottles really). I had a splice fail once on the pad around 6 bar and it was very loud and my ears were ringing for a good while after. Like you I started with 3d printed bottle caps and a garden hose connector, my launch rail was just a simple steel rod, maybe 5mm or so, with sections of soda straw taped to the rocket to run along it. After I got access to a lathe the very first project I turned was the heart of a full bore water rocket launcher. It's essentially just a suitably sized tube with grooves on the outside for a pair of o-rings to seal against the inside of the bottle neck. I use a circle of zip ties where the heads act as claws holding down the flange on the bottle close to the threads. These zip ties are are held in place by a spring loaded outer ring that is pulled down by the launch cord to release the rocket. Anyways, full bore rockets accelerate very fast and there is no need for any proper rail (though my launcher has a tube exrending into the bottle, not sure if this matters, it just seemed like a good idea). The downside of full bore is that it doesn't look quite as cool as a rocket slower off the pad, but the performance is way superior to anything I ever achieved with a restricted nozzle.

[@Positive_Altitude]

Great vid! Don't know much about water rockets, but for me, it seems like there should be a little bit more trust-to-weight ratio for this rocket, the start seems slower than it should. Maybe less water, more pressure, or a bigger nozzle would work better! I think there is a lot of space for improvements and it could be fun!

[@arro_rockets]

Thank you! Water rockets tend to suffer from a lack of acceleration due to the high mass of the water (taking up about a third of the volume). You can definitely improve this by using a higher pressure which is certainly something I'll try! (went for a lower pressure for the test flight just to be safe). Also increasing the nozzle diameter increases the flow velocity, which improves acceleration, but that would require completely new launchpad infrastructure.

[@polrty]

really underated video man enjoyed it allot !

[@arro_rockets]

Thank you! Glad you enjoyed it :)

[@ptonpc]

Very nice build. It's great to see you experimenting and building.

[@thorinti]

Excelente vuelo!! Me suscribo 👌👌

[@Pexon_Mid]

Great video I really enjoyed watching the whole process.

[@Azr0n-40k]

He needs more subs!!!!!

[@winstonsmith478]

Shouldn't the 'chute attachment point be placed further forward to avoid a nose down attitude caused by rearward center of pressure caused by the fins instead of further back as I believe you said? You would thereby be putting more of the mass rearward from the attachment point, better overcoming the drag of the fins moving the fin section upward.

[@arro_rockets]

Yes absolutely, only noticed that mistake after uploading!

[@smellycat249]

Your doin better than that Arca space program

[@arro_rockets]

Don't know if that's a particularly high bar 😂

[@daviddavids2884]

good work. larger parachute. result: descent rate and the affects of the fins are reduced. d

[@arro_rockets]

The damage was only really caused by the nose-down attitude of the rocket, and since the rocket has such high drag and surface area, I'm confident the parachute isn't the issue, just the shock cord placement :)

[@shenkclan]

As part of science fair project my son and I took a single bottle rocket added stratofins and a supplemental nose cone with altimeter and tapped a keychain camera to the upper section. We were able to achieve a 300ft altitude with a pretty simple rig at 120psi. We only launched once at that psi normal preassure for launch is 80psi which would get 200ft flights pretty easily. Recovery was simply a tumble recovery. Over the launches we added a shock absorbing mount for the altimeter and had to replace the upper electronics bay at least once. Interested to know hat altitudes your new rocket reached.

[@mearsm50]

How about stretched elastic bungee to give it a boost off the rail? It seems that most of the propellant is used to get it moving. Leting the rocket take over when getting to free air may give a considerable boost.

[@arro_rockets]

Interesting concept, implementation sounds like a challenge tho!

[@bubbleobill267]

How long until we see five backyard rain water tanks as pressure chambers?.

[@malenkiybog]

Cool T-Shirt

[@suetaylor1127]

Dude you should market this as a toy. Your prolly the only one that’s ever achieved this so you know the secret of building them.

[@MatthewZelek-iv8tb]

It’s a whole hobby that has been around for decades. He says it in the video, he bought his nozzle from a supplier.

[@ntshade8806]

i remember making one when the internet just became a thing

[@tranhuyhoang6312]

I think you should keep a board close to the tail of the rocket to optimize lift and you should add additional springs to optimize thrust when lauch the rocket

[@just4callplus]

I enjoy your experimental content

[@jrrarglblarg9241]

Very cool build. Keep experimenting. I’ve flown Estes rockets and my first launch of my first F-motor rocket flew exactly like your Launch 1, and for exactly the same reason, sticky launch rod and thrust causing torque between top and bottom lugs. Expensive and embarrassing to do at a rocket club.

[@mikelakner5622]

What about dry ice vs compressed air? The controller could release it into the water. Add a valve at the exhaust end that does not open until the controller senses a proper amount of pressure.

[@Battlefresh]

I was thinking the exact same thing. We used to blow up oversized 3 liter bottles with dry ice and water and the boom was tremendous. It must have been at least 200 psi before bursting. You could easily adapter a pressure gauge to the fill cap which will freeze the max pressure reading. Then build a release valve which opens just below this value.

[@alexandrelerestif]

It seems to me that the majority of the energy is being used in the very beginning of the acceleration phase. If your objective is to make the rocket go as high as possible, maybe you should consider a second propulsion method for just the first meter or two of the flight. Like a long spring (steel or rubber) or maybe something driven by pullies and weights. It would act as a “booster” and would probably make the rocket go much higher.

[@paradiselost9946]

at that point its cheating... lol. and theres still the issue that the water IN the bottle has to actually STOP. then accelerate the other way. its going UP. it has to be accelerated DOWN to get the BOTTLE to go up instead.

[@hasan-m9o8x]

here before this blows up! so coooollll

[@arro_rockets]

Thanks!

[@JRJetMan]

Enjoyed watching you develop and expand you're water rocket's thanks for sharing. Have you considered a catapult as a launch rail? If you could make one work successfully It would accelerate the rocket off the rail much faster when it needs it most for no weight penalty to the rocket itself, just a thought.

[@jrrarglblarg9241]

Combining the down-pull on the connector with a release for a spring in the rail to push the rocket like a nerf dart as the water starts making thrust is my thought.

[@arro_rockets]

I apologies for the dodgy audio at 4:27, had to cut out some copyrighted music!

[@stuartpatterson1617]

I'd use loose rings on the launch rail for less friction. Nice RTL at the end :)

[@timhochstetler]

what about adding two air pressurized tanks on the sides and water in the center tank, would look like the falcon heavy rockets and give you longer thrust?

[@arro_rockets]

You're totally right! That's actually been done before by Air Command Rockets and I'm sure others. Basically having three cores where the two side cores pump pressurised air out the top and connect to the top of the centre core, pushing the water out.

[@tomsalzano8120]

Tons of fun man. Would it be worth adding a silicone tubing powered 'shuttle' to launch the rocket off of the rails ( sort of like an aircraft carrier launches planes, albeit at low-power / low-tension so as not to rip the launch lugs off of the rocket, yet still prevent hangups on the launch rail.....and preserve internal thrust energy from the rocket, so that it would be applied to achieving higher altitudes on the launches instead of dissipating that energy on the launch rails ? ). Either way, looks like LOADS of fun !

[@daviddavids2884]

oh. you mean a BUNGEE. might be worth trying.

[@arro_rockets]

Seems to be a popular idea considering you're the second person to suggest it, sounds very cool, just tricky to implement!

[@Bob_Adkins]

If there is room in the AL channel, very thin HDPE tape may work better than silicone lubricant, or both may work. There is always going to be wobbling causing misalignment problems in a long channel, rings may work better. There used to be 2-stage toy rockets that would go OOS. I want to say there were even 3 stage ones, but don't remember.

[@Smokkedandslammed]

Self landing water rocket??

[@Game-in-tosh]

Nice your channel , after my mind hauls to develop and innovation research about rocket propulsion types , your channel is highly Appreciated ❤❤❤

[@simonabunker]

Nice work! It might be worth doing a burst test to see how far you can push the pressure up. I think there is PET specific glue that can get a really good join. If you wrap with tape (or fibreglass) you could probably go even higher. Probably better to do any pressure tests filling it entirely with water - it's a lot safer as it is incompressible. I guess you know about Air Command Water rockets website/KZbin channel? Lots of really great information over there!

[@arro_rockets]

Yes bursts tests are always a good idea. Unfortunately pressurising that high is a challenge with a bike pump, and the proximity to the rocket also makes working at those higher pressures a little dicey. That's why I stuck to a relatively low pressure that I knew would work and wouldn't be too dangerous (80psi). This rocket could definitely perform better with higher pressure. And glass tape or fibre glass would be an excellent way to increase pressure! As for Air Command Rockets, I have been watching their videos for many years now, and they were the ones who reached out and suggested silicone lubricant on the launch rail :)

[@simonabunker]

@@arro_rockets I had a lot of problems with a cheap Kmart pump - then I got a mid range pump from a proper bike shop and it got a lot easier! Proximity is definitely an issue - I am not sure about the connectors on air compressor hoses. Haven't tried a launch in ages!

[@arro_rockets]

@@simonabunker Bike floor pumps are definitely the way to go for a manual solution. I know Air Command Rockets use a scuba tank which certainly speeds things up

[@colinrousseau8803]

@@arro_rocketsGreat video! Love to see your futur content! I actually designed and flew a similar but lower volume water rocket, about 1 year ago. We were hoping to reach an operational pressure of 140 psi on our splices. Hence I did multiple and multiple burst tests with different glues and techniques. I finally developed a technique able to withstand 180 psi but 160 before permanent deformation. Without using fiberglass, which is much easier. I have a few tips if you ever need some in that regard. I'd love to talk to you about your deployment system, I've encountered many problems with mine. Keep up the great work!

[@jozefnovak7750]

Super! Thank you very much!

[@oldschoolman1444]

As a child of the 60s we had small hand pumped water rockets that would go up about 70 feet. I'm sure they don't make them anymore with all the safety crap, ah the good old days!

[@DKG1NDP]

the glues joints look like the joints on that titanic sub that imploded

[@javidancool8308]

Would like to have steps for kids, something like projects for starting engineering at 5 th grade. Great vid btw

[@arro_rockets]

Thanks! That's an interesting idea

[@MarcBossYT]

Really cool

[@MatthewZelek-iv8tb]

I’ve seen great success with internal launch tubes instead of external launch rail. Basically launching the rocket like they do off an aircraft carrier. All that inertia before you start using water can give you a lot higher launches.

[@Johnellenberger1]

Very Cool!

[@Dr.Coconut1245]

do you do any simulations for your flights, or is it just a build and see? I’m coming from model rocketry where i use openrocket to make sure my design will actually fly. this is really cool, and seems way more approachable and affordable than solid rocketry.

[@arro_rockets]

That's a great question, and I highly recommend you get into water rocketry (I have a lot of videos covering how to get started, especially with the launcher mechanism). In terms of simulating water rockets, there are simulators online where you can plug in the basic details of your rocket and get a rough estimate. OpenRocket will always be more accurate since it takes into account the aerodynamic properties of the airframe. So, in the video called "Solid Rockets vs Water Rockets" I developed a program which can generate water rocket thrust curves, and then inputed them as their own engine file into OpenRocket to get a complete simulation. Sounds complicated, but there's are report in the description of that video which covers it in more detail.

[@tarstarkusz]

Do you think the nozzle is both too big and dirty? I would think you need an extremely smooth nozzle that is smaller than the one you are using.

[@jayflow7949]

This is Absolutely Amazing!!! I Think Make One From Carbon Fibre & Use A Big Electric High Pressure Water Pump Which You Can Make From Most Cheap Water Blasters!!!! There’s Some KZbin Videos That’ll Show You How Too Do it & it’s The Safest Way Too Increase Pressure 1000 Times Than V1 Much More Powerful Even Make a Dual Chamber With Different Fluid Vessels That Work independently or in Sync…. I Had a Small Toy Version As A Kid!!!!

[@Alex_science]

Very nice. What kind of glue do you use to glue the bottles?

[@arro_rockets]

Selleys liquid nails

[@bunnykiller]

next step, use pressure tanks from paint ball guns and the trigger mech to act like a valve... and if you have the funds, try the 4" dia. medical oxy tanks ( good for 2000psi) use a scuba tank to fill them.... watch your pressures tho....

[@arro_rockets]

Sounds terrifying haha

[@blipco5]

You need to employ some sort of coil spring to get that rocket started off the launch pole.

[@teweldemat]

I speak for cameras: having the rocket you’re filming pee on you hurts the ego more than being blown away by a shockwave.

[@alanjohnstone8766]

I think you should abandon the outside guide rail for an internal metal tube that is attached to your gardenia filling attachment. ie the air comes out of the top of the tube. During launch the pressure is forcing against the top of the tube creating massive acceleration even before the water starts to be pushed out. If you do the math this is the most efficient way to use your precious air pressure and turns the need for a stabilising frame from a negative to a positive in getting the rocket higher.

[@dod180]

You have the room I would go with a larger shoot to slow the decent and soften the impact

[@foamboard_shenanigans]

Awesome video! And a great way to get into model rockets in Australia. Good luck with the future projects.

[@arro_rockets]

It's perfect in the summer months when the weeks are often riddled with fire bans!

[@foamboard_shenanigans]

​@@arro_rocketsi have looked for expanding liquid nails at bunnings but I can't seem to find it. Is it sold under a different name like fast grab or waterproof ? I have the bottles and all the bits apart from the adhesive. Thanks!,

[@arro_rockets]

@@foamboard_shenanigans I used Selleys liquid nails from bunnings --> www.bunnings.com.au/selleys-320g-liquid-nails-original-construction-adhesive_p1233751. I can't recall if I used the heavy duty variants or not but the original should work fine. I hope you're able to track it down in store! And one thing to look out for when using liquid nails for this is to make sure to get an even spread as you push the bottles together and avoid air pockets, you can help yourself with that by making sure the shrunk bottle is not warped in any way (that was the issue with the Gamma III). Best of luck with your rocket building! :)

[@Sir-Dexter]

nice work ...

[@waaggzz2871]

mate my dad has built these for years and they go alot higher than that.. 100psi charge limit. you can make a multi stage rocket also by using a bolt to hold the bottles together, with the bolts hollowed so they are 1 big chamber. this multi bottle rocket goes about as good a single rocket. how my dad launched it was with a fork lift and bungee cords. the bungee cord held a plug with o ring in the nozzle under tension. there was a bike valve fitted to the top bottle to charge it, the pin would fall out the nozzle as it reach the top of the forklift and away it would go. ill have to ask my old man how many bottles was used i was very young back than. but i think it was around 6 or 7 2L coke bottles.

[@RickyD1968]

Very cool !!!!!!

[@nv7213]

Why don't you 3d-print the frame pieces to increase stiffness and make it look more professional?

[@B0aws]

This was great! Please do make more, but most importantly, take good cear of yourself

[@arro_rockets]

Thanks! Let me know the kind of things you'd like to see!

[@charlesspringer4709]

Teflon or Delrin rail "beads" or T shapes. It would be cool to find polycarbonate tubing about twice as think as the soda bottles and triple the pressure. You make me want to try this with PVC plumbing pipe. It can handle much higher pressures than the water pipe rating because it has to take water-hammer and other effects. 4" PVC pipe has a minimum burst pressure of 1100 psi or 7650kPa. 3" is 1200psi.

[@Tonyloeffel]

good comments and suggestions below. I suggest filing back the rail guides a little so they are not a snug fit. All your reasoning sounds good, just loosen it up a little.

[@KennethScharf]

Instead of the aluminum extrusions as a launch rail, I'd probably try using a 1/4 - 3/8" thick piano wire with an aluminum tube attached to the rocket to slide over it, like the old Estes launch system. How much water do you use, ie: whats the air/water volume ratio? Also what's the max PSI you've used? I wonder if a two stage, or parallel stage water rocket would be possible?

[@lavafootpodcast1147]

What model of the Nikon camera are you using?

[@arro_rockets]

It’s a Nikon D3300 :)

[@lavafootpodcast1147]

@@arro_rockets Awesome, Thanks!

[@sptrader6316]

I think a bigger parachute, would minimize damage, regardless of how the rocket landed. (landing slower = less impact).

[@robertstark3326]

With the pressures you're at I believe you should have choked flow. I think the nozzle geometry might be critical to performance. I recommend 3D printing various nozzle geometries (which you can research). I bet you can easily double your performance. Nice video, keep up the water rocket research. One of the first things I bought myself with my own money was a water rocket. I loved that toy. But it isn't a toy, really.

[@arro_rockets]

At the relatively low pressures I was working at for this test flight, I'm certain that simply a larger nozzle diameter would've provided a higher (granted short term) acceleration which would have probably been more ideal. But obviously the 9mm nozzle still worked which was my only concern, and meant I could use the hardware I already had. Tricky thing is with using garden hose fittings is that it limits what geometries and diameters are available, so to experiment with that, I'd have to make new launcher mechanisms, maybe a future project! :)

[@winstonsmith478]

How about having the nose cone/recovery section just friction fitted to the top water reservoir, having the 'chute attached just to the nose cone/recovery section and that section attached to the top reservoir with perhaps a meter's length of 1/4" elastic band of the type used in sewing as a shock cord. The rocket would then come down base first.

[@arro_rockets]

I've used a passive deployment system similar to what you describe, check out the "Solid Rockets vs Water Rockets" video if you're interested. Problem with it is that it's quite finicky and pretty unreliable, especially with water rockets and not just air rockets

[@UnitSe7en]

A tight dovetail is the worst rail you could have. So much friction even if lubed and quite intolerant to offset forces forcing a twist causing binding. Swap it for a simple tube with a slit and an easy-fitting post down the middle. The rocket will find it's own way straight off the rail - It doesn't need to be a high-tolerance fit. The rail isn't for guidance to keep it straight, it's just to stop it falling over before aerodynamics start acting so that's all you have to make it do.

[@arro_rockets]

For this rocket and other water rockets I agree that perhaps a different rail design might be more suited since the tolerances are worse on such a flexible, and changing airframe (as it pressurises). However I wouldn't say the rail I was using is the worst in general since 10/10 extrusion is the standard used in model rocketry

[@TheAdeybob]

I suspect the rocket body is bunching up and flexing when the thrust initiates, causing the guide pins to rattle up the guide rail. I'm not sure of the efficacy of it, but adding a middle guide pin might help distribute the forces - and I'm also thinking an inner bladder might provide better rigidity and allow for less bulky seals along the body..?

[@mrrob7531]

Looks like you had a few pre mature explosions if you catch my drift.

[@rabitrees9709]

Try putting 2 fins on nose cone????

[@AlexFoster2291]

Why do you launch on 1?

[@joejoejoejoejoejoe4391]

Soft foam nose cone?

[@EUPThatsMe]

Soap you say... how about using micro fine particles such as Diatomaceous Earth?

[@TheAdeybob]

flexing. Another guide in middle might sort it...or an inner bladder to add rigidity? Bladder with appropriate physical attributes should also allow you to pressurise the bottle-walls more.

[@andreassittig2772]

Am I the only one who was hoping for some of that logged barometer data?

[@lonewolfhamradio]

Wow great engineering skills 😮 I used to make water rockets when my kids were little, nothing this sophisticated though, just an old coke bottle with a sports cap lid, big inner tube valve and an air pump 😂

[@arro_rockets]

Thank you! And I've made my fair share of single bottle rockets, they're good fun!

[@gliderrider]

I used a plastic straw and a steal rod on my water rocket. Your mounts might be to heavy. Also I used some dish soap. My movies are on my channel but about 15 years ago.

[@gliderrider]

kzbin.info/www/bejne/bpfdf6aorLRohKssi=HPuPc3DGiqaRUYBg

[@markmedia8252]

What is your local councils laws on Rockets and do you need any insurance incase it causes and damage

[@arro_rockets]

You don't need insurance or special permission to launch low-mid power rockets or water rockets. Anything more than that, launching with a club is advised, membership fees covers insurance (last few videos I've made have been with a club)

[@btrocketry3736]

Better to have a broken fin than a broken nose especially if you're carrying a payload or a camera on the way down.

[@arro_rockets]

Exactly, that's the idea of the horizontal landing I was aiming for!

[@g.maryenko]

Лайк за тризуб!

[@arro_rockets]

слава україні!

[@g.maryenko]

@@arro_rockets Героям слава, брате!

[@GridPowerLLC]

Why not use PVC pipe?

[@UhhMyBadd]

Try using a new nozzle

[@phillipbellgreen592]

Your rail buttons are too fair apart. Think maybe 2x the rocket diameter apart, as close the CP or CG would ideal? Your buttons are nose and tail, very far apart creating friction.

[@arro_rockets]

That's a point I haven't heard yet! Thanks!

[@feelincrispy7053]

I liked the video but it really didn’t need to be 18 minutes long

[@johanrheeder1640]

How about using carbonated water instead...

[@techtinkerin]

Dont mean to be nasty but that was bobbins 😂

[@matthewdawsey9892]

Water isnt ideal for a rocket exhaust, because water is incompressible. The water isnt being accelerated through the nozzle very much.

[@matthewdawsey9892]

Try pressurizing the bottle with just air, and add a cd nozzle on it.

[@arro_rockets]

@@matthewdawsey9892 The water is actually a critical component, there's a reason why water rockets are such a common type of rocket. Like you mention, the exhaust velocity is very important for performance, however another component of the thrust equation is the mass flow rate (quantity of mass flowing through the nozzle), so water adds this critical mass to the exhaust, which inherently provides more kinetic energy. You're correct that water is incompressible (which is ok) and also has quite a large mass, so the compromise for water rockets is approximately 1/3 water and the rest air by volume. I've launched this rocket and other water rockets with just air, and the results are much less impressive due to fact air doesn't have a high mass density.

[@BABALOOEY46]

Are you working on a compressed rocket without safety glasses??? Tut tut. 😊

[@swigsher005]

the only thing that i focussed on the video is your ukraine symbol shirt

[@arro_rockets]

I'm Ukrainian :)

[@swigsher005]

@@arro_rockets Wow but it's the first time i've ever seen ukrainian speak english fluently like you

[@lesykyavorskiy7630]

"Zelenskiy will call you"

[@kennethschultz6465]

WD40 Pffff is for stainless steel .. it is not like in N O T at all a lubricant... SILLICON SPRAY. use TEFLON PtFe rail nob´s ... why doe´s nobody make a sepret air pressiur tank who injekt high pressiur air in truh nossels in a wentury nossel so water get added speed.. it is like a water jet under water doe´s not push as hard as a waterjet pusking off the water surface.. any on knows this..

[@arro_rockets]

I used WD-40 brand silicone lubricant, not just regular WD-40, which is fine for aluminium :)

[@kennethschultz6465]

@@arro_rockets yed sorry ... it lok´ed like regular wd40 ...!!! i like your design.. but if you seperate water and air and first blend them in the venturi nossel.. so you feet more air in the water for better thrust.. misty air push harder.. try a regular water hose and make a hole in side .. 5cm from the opening .. push air nossel in hose and open for air .. you get way way more power... on air and water.. make a test.. you can even make a small tube with air injector on side ... just look up venturi nossel .. it accelerate water air pressiur... and water speed/presiur.. push harder longer

[@esahg5421]

excellent 👌 video, now go FREE PALESTINE ✊