Increasing Parachute Drag

Measuring the effectiveness of reefing a parachute to create more drag. This is useful for time of flight competitions, or when you don't have enough room in your rocket for a bigger chute.
More details are available here: www.AirCommandRockets.com/day1...

[@PieroAcme]

Simple and well done! Thanks for sharing your usefull experiences!

[@RaketfuedrocketsDeutschland]

Thank you for this interesting video, George! Quite impressive, how easy it is to improve the effectiveness of a parachute. Keep it up! Juian

[@AirCommandRockets]

Thanks Julian. While I don't expect we would use this technique all the time, it may be useful in some scenarios.

[@danielzhang7025]

This is so helpful! Thanks for the info.

[@neil3850]

Can you tell me the physics behind how reefing a parachute increases the drag?

[@RhyssRocketProject]

Great work i might do something like this for the kookaburra 5 if thats okay.

[@carmoldu]

Really interesting and well edited and explained!

[@AirCommandRockets]

Cheers carmoldu :)

[@davidz2935]

Really good video, what's the name and reference of the onboard camera and the altimeter ?

[@MacStrange]

Very, very interesting 🚀

[@Basrockets]

Cool video

[@AndreBandarra1]

Quite interesting George. These pulled-apex parachutes are the most common parachutes we use in paragliding as a reserve or backup should anything nasty happen to the paraglider (big collapses, tangles, loss of controll, etc)

[@itsjustme4026]

Andre Bandarra what was the GSM of the fibre of the paraglider that you had done a experiment of testing very short the lines?

[@1islam1]

@@itsjustme4026 ⚠️ God has said in the Quran: 🔵 { O mankind, worship your Lord, who created you and those before you, that you may become righteous - ( 2:21 ) 🔴 [He] who made for you the earth a bed [spread out] and the sky a ceiling and sent down from the sky, rain and brought forth thereby fruits as provision for you. So do not attribute to Allah equals while you know [that there is nothing similar to Him]. ( 2:22 ) 🔵 And if you are in doubt about what We have sent down upon Our Servant [Muhammad], then produce a surah the like thereof and call upon your witnesses other than Allah, if you should be truthful. ( 2:23 ) 🔴 But if you do not - and you will never be able to - then fear the Fire, whose fuel is men and stones, prepared for the disbelievers.( 2:24 ) 🔵 And give good tidings to those who believe and do righteous deeds that they will have gardens [in Paradise] beneath which rivers flow. Whenever they are provided with a provision of fruit therefrom, they will say, "This is what we were provided with before." And it is given to them in likeness. And they will have therein purified spouses, and they will abide therein eternally. ( 2:25 ) ⚠️ Quran

[@KerbalChris]

Make a motor pull the string in and out for normal and reefed parachutes so you can descend fast at high altitudes so it doesn’t land too far and then reef it at low altitudes to slow down for a gentle landing

[@thorinti]

Como siempre George, tus videos son muy ilustrativos e instructivos. Gracias por tus conocimientos y el trabajo realizado para enseñarlo mas allá del idioma :) Luciano

[@AirCommandRockets]

Thank you for the nice words Luciano. :)

[@tumblingsloth6206]

How would i make a high velocity parachute without it ripping? I have a simulation in open rocket that says it will deploy at 60-40 meters a second.

[@AirCommandRockets]

You could try reefing it with a reefing ring, or deploy a drogue first and then when the rocket slows down open the main.

[@mdk2127]

Verry usefull invention George!

[@AirCommandRockets]

Hi Mathieu, I can't take credit for this one. This is a known technique for reefing parachutes, it's just not very commonly used.

[@rsmukesh1702]

Mathieu DK djkl

[@kwinvdv]

So how much smaller reefed parachute could you use instead of a normal parachute, which have the same decent rate? And therefore how much weight you can safe and thus reach an higher altitude.

[@AirCommandRockets]

Aerocon Systems sells 36" parachutes reefed in this way and they claim that it is as effective as 44" chute. When you substitute the numbers into the parachute descent rate formula the rate difference is around 18% for those two chutes. I would imagine the difference in weight of these two chutes would be fairly small and so a potential weight saving as a percentage of the overall rocket weight would be also small.

[@BLOODqeqed]

Nice video, one question.. for 700g and for 1 kg what diameter (size parachute) is required for a very slow landing? Thanks.

[@AirCommandRockets]

There are a number of factors that affect how fast the rocket descends under parachute. Here is a good reference that lets you calculate the descent rate, size of chute etc. web.archive.org/web/20111018045919/http:/my.execpc.com/~culp/rockets/descent.html

[@deepavelan6594]

How did you make the parachute

[@designer.346]

nice video ;)

[@xXGamerHDXxxXGanerHDXx]

Where did You geht the parachutes

[@cooperthompson4850]

They are homemade

[@-.._.-_...-_.._-..__..._.-.-.-]

Science!

[@newchannel-yk5gb]

Kaise banate ho pairashut

[@parhamray4843]

Hello AirCommand I'm only 12 and I wanted to make a water bottle rocket I don't want to go too big only one bottle I know all the aerodynamics but I want to make a launch pad how could I make a cheap easy launch pad for pressurising rockets and have a release cord PS: could I get all the materials at bunnings? Thanks!

[@AirCommandRockets]

Hi, yes you should be able to get everything from bunnings. I would recommend building the Clark Cable tie launcher as its fairly inexpensive to build. If you need the Shrader valve you may need to visit a store like SuperCheap Auto. You may also want to read this article on launchers: www.aircommandrockets.com/rocket_launcher.htm

[@parhamray4843]

AirCommandRockets Thank you so much!

[@riocruz5691]

Sir, can you give a scientific explanation as to why the parachute with the reefed at the center has higher drag than the normal parachute? Thanks

[@Shangoo]

pretty sure its because it pockets slightly more air (because of its changed shape), keeping it under the chute for longer, but not 100% on that

[@Nightwolf323]

Hey I remember looking at your site that I was looking at some of your experiments and I saw that you did a microgravity experiment with m&ms but the video is broken, so all we can see is some pictures. I would love to see that video. I am actually building my own rocket with a payload bay to see what kind of microgravity I can create, and I would love to reference your video to see what I can expect. Can you please fix it somehow? Thank you very much!

[@AirCommandRockets]

There is a whole bunch of videos that were on the old channel that we would like to move over to the new channel. When we find some time, we will re-upload them to this channel. We still have a copy of some of the videos on MySpace... mysp.ac/3aFVC

[@Nightwolf323]

AirCommandRockets cool thanks!

[@neil3850]

How do you figure out the exact string length for the reefing line

[@AirCommandRockets]

The length is just set so that the center of chute is in line with the outside of the parachute. The length isn't super critical.

[@neil3850]

If I use a hole for the parachute should use more string around the hole to make the parachute more stable?

[@AirCommandRockets]

@@neil3850 I wouldn't think so. The hole is what makes the chute more stable.

[@blackmantis35]

Great knowledge ! ...thanks so much Now Im going to win 4 sure ??? !

[@AirCommandRockets]

Good luck?!

[@manoranjantripathi9546]

shushant

[@itsjustme4026]

Just construct a bigger parachute! XD

[@AirCommandRockets]

Then reef the bigger parachute and get even more drag. The point is you can take any similar shaped chute and give it more drag.

[@itsjustme4026]

Air Command Rockets yeah lol