4 stroke ultralight engine takes flight! Presenting the latest project... Thump-Air!

[@alfreddurbyn642]

I know this is a older video and you've done a lot of modifications to get this far but thought I'd mention that predator is now making a 459 max engine that has a pressurized oiling and that could make a difference on long-term use, especially using a small oil cooler with it. Just thought I'd mention it, it's awesome what you have done with it.

[@rhoda4558]

It looks like it has good power. Thanks for giving us a peek at it preforming.

[@briand4000]

Man I commend you for exploring the alternative engine realm. I'm currently bringing a 912ULS into current airworthiness in a SLSA and it is INSANE the cost of everything! Of course they like to use weird "only available in the European market" stuff. Carry on and best wishes!

[@garybucher6824]

That's sweet man , i had a feeling after i checked into MULA and saw what your doing you were gonna make things happen. Good for you ! Hopefully i get down there next spring met you and start learning to fly.

[@kidkhaos6427]

I am working on it! Look forward I to seeing you at our next fly in.

[@Tomsfoolery.]

My first Powered Parachute was a Buckeye Dragonfly with the 4stroke Generac engine. It sounded just like that in the air! My two stroke friends teased me saying I sounded like a lawnmower in the air lol

[@kjlahti782]

Great job on the engine,

[@eshannonfly]

Looks like she has some torque!!💥

[@kidkhaos6427]

Facts.

[@daviddavids2884]

tail control surfaces are IN the prop wash. engine seems to be making 200 db of noise

[@kidkhaos6427]

Every Aerolite 103 ever built shares the same exact tail feather location as this airplane. It happens to be extremely handy to be able to blast the tail with the prop. It provides superb authority on the controls. The engine is definitely quieter than the rotax 2 stroke it replaced. Maybe a cell phone microphone isn't a great decibel measuring apparatus? 🤷‍♂️

[@Mikeofmanyhats]

This is so cool!! I’ve been following you for a while and I can’t wait to see how it progresses! How far out do you think production/kits will be? Thanks for sharing!!

[@kidkhaos6427]

I'm working on this non stop to have it ready for oshkosh. I should have at least one engine ready for sale, one flying in my airplane, and another hanging of the front of a badland aircraft ultralight!

[@chrisjohnson6610]

Any updates? How many hours on the test bed? Any other Thump Airs in the sky?

[@Down_To_The_Bone_Garage]

Nice work!!!! How do you like it?!

[@kidkhaos6427]

Its a very different power delivery than i an used to. Kind of strange but I'm still speaking from very limited experience.

[@Down_To_The_Bone_Garage]

@@kidkhaos6427 you got off the ground fast! I'm impressed.

[@kidkhaos6427]

@@Down_To_The_Bone_Garage its weird. The "launch" when I repease the brakes doesn't feel as hard as the rotax, but it hops off the ground super fast still. Im still experimenting with it. It will definitely take some getting used to but overall it provides a nice experience. I think it will work out nicely.

[@evanbudzinsky221]

Aspiring pilot where should I start is ultralight the way?

[@vg23air]

What is the size and pitch of that 3 blade, and the top rpm of the engine with that prop ?

[@michaelguy7168]

Any specs on your new engine, looking for a lightweight engine for a Rans S4.

[@kidkhaos6427]

Honestly everything is an estimate right now as I'm still in the test and tune phase. I can tell you it seems like it's going to be a hoot to fly!

[@stevecarlisle3323]

What happened to the 2 stroke Arctic Cat power plant ?

[@kidkhaos6427]

@@stevecarlisle3323 i have it squirreled away for a special project coming up for it.

[@gerwheelz3154]

Subscribed 👍love this plane i wish i could afford to build one .

[@kidkhaos6427]

Join a flying club! The cost of the aircraft is shared as well as the maintenance.

[@gerwheelz3154]

@@kidkhaos6427 I live in Ireland we dont have part 103 so it costs upwards if 10,000 euro just get licence ppl 😔 for that much money in the states I would have a nice ultralight.

[@kidkhaos6427]

I'm sorry it's complicated for you. One of many reasons I love being a red blooded American!

[@jasongrinnell1986]

@@kidkhaos6427👍🏻

[@sacooper802]

there are a lot of performance parts for the 440cc engine, and even the newer 460cc engine as the Aftermarket parts interchange with the gx390 honda engine parts, but the 650cc engine which does not share parts with any other engine only has a billet con rod and heavy duty valve springs to offer but it has enough HP even at stock 21-23hp stock and after some mods should be 30-35hp, whats your take on the 625cc single cylinder engine? seems like the threshold from single cylinder to v-twin is around 650cc to 670cc, but v-twin is so darn heavy to qualify for UL part 103. have you taken a look at the EFI kits as well for the small engines, walbro has one as well as ecotrons and then of course the ebay versions?

[@abelferquiza1627]

brand?power?

[@kidkhaos6427]

Thump-Air, 40 hp www.kidchaosconcepts.com/product-page/thump-air-4-stroke-ultralight-aircraft-engine

[@jasongrinnell1986]

What are the advantages of 4 stroke?

[@alaskaaksala123]

Generally they are quieter, more fuel efficient, no mixing gas, more range and distance. And generally they are more reliable.

[@Tailwind1]

Hi Scott, I'm in the market, would really appreciate your feedback on the Airbike vs. Aerolight. TIA :)

[@vg23air]

So this engine achieves 1.42 hp per cid That's fantastic, Rotax will be jealous, they only get 1.2 hp per cid on the rotax 912 uls with 82.5 cid and 10.8:1 compression ratio A few more tweaks and you can easily surpass the ULS Vz POWER TURBO conversion of the 912 which achieves 1.46 hp per cid.

[@johnwadmaniii]

Looks like you’re almost out of ground effect. Have you gotten to pattern altitude with it? Rate of climb tested yet?

[@kidkhaos6427]

Yes it flys awesome.

[@barnabyandanthonysofficial1497]

what's your estimated gallons per hour?

[@kidkhaos6427]

Just shy of 2 GPH.

[@barnabyandanthonysofficial1497]

@@kidkhaos6427 thank you, quick draw McGraw! I wish you all the luck in this, its very exciting! I hope in a couple years when I'm done with grad school I can get back to flying :)

[@barnabyandanthonysofficial1497]

@@kidkhaos6427 love it! can't wait for whats next to come.

[@kidkhaos6427]

@@barnabyandanthonysofficial1497 I'm machining a billet head for this engine currently. It's pretty neat. Thanks for the support!

[@barnabyandanthonysofficial1497]

@@kidkhaos6427 my pleasure! Do you think it rock dual ignition?

[@machoman5356]

Sounds like a string of m80,s going off only way to fly.

[@kidkhaos6427]

Its pretty unique for sure. Reminds me if an old thumper dirt bike, hence the name Thump-Air.

[@machoman5356]

@kidkhaos6427 tail drag areolite? How many lb tail drag save? If it was even an ounce it,s worth it.

[@kidkhaos6427]

It shaves a surprising amount of weight, well over 10 lbs. Its super easy amd forgiving to land also. I'm very happy with it.

[@machoman5356]

@kidkhaos6427 I would be to. Plain looks excellent!

[@siswaabadi7780]

Top

[@bkairys]

Yeeeehaww!

[@daviddavids2884]

the wisdom of using a three-bladed prop is less-than certain.

[@kidkhaos6427]

Prop was recommended by a team of engineers from a highly successful and globally renowned propeller company.

[@vg23air]

yeah i have the same concern.

[@LeonardLayne]

looks like a BMW engine..Sounds like a baby v-twin

[@sacooper802]

have you flown the pattern yet with this new engine? has Badlands flown the pattern or even done crow hops? do you have a dyno? I know you gotta test stand, I would run the crap out of this engine on test stand before going to the air? but I'll let you be the Guinea pig...LOL

[@kidkhaos6427]

😅 no worries sir! I've survived multiple engine outs and will fly with an escape plan until im extremly confident. There is a conpany abroad that has had great success flying these.

[@sacooper802]

@@kidkhaos6427 Im flying a Powered parachute which is safer during an engine out IMO so I can try all sorts of engine combos. but I also have a phantom x1 UL and a j3 kitten, I got gaokin 800c v-twin to test and a kohler v-twin to try out but you really got me researching the possibilities of these big block single piston version to save weight to make part 103, thanks for the inspiration.

[@MrFoslund]

Dam that's a noisy engine

[@thatfeeble-mindedboy]

Get a better camera or at least a better microphone… geez that’s pathetic…

[@kidkhaos6427]

Can't afford it. Spent all my money on airplane parts.

[@thegarre]

It’s fine just as is 👍🏼