JS2 1st Self Launch

JS2 Revenant Self Launcher from Jonker Sailplanes - maiden self launch take off

[@Schevron]

Well done - and once more such a beautiful Airplane. I also like the new paint scheme 👍🏻

[@francoisdelon932]

BEAUCOUP trop bruyant ... et musique très énervante !!!

[@adamlhotak8180]

still waitin for the self launch jet motor with afterburner 😆

[@Mike-nk3ue]

Well done Jonkers Team! Another Milestone!

[@Voyteck]

Looks like my next dream glider!

[@awk8356]

Could you please show us the altimeter next time? I would like to see the whole take off recorded. Thank you.

[@victorwargnysoaring806]

that moment when you see something so beautiful and awesome that you know that you will never be able to afford it

[@SeanFChannel]

Pretty slick! Will it whoop the EB29? Does that guarantee come in writing? If so I’ll take 3!

[@eglide73]

Love the glider. Hate the motor. Hate the smell of gas. Hate the vibration. Hate the possibility of dying in a fiery crash.

[@KB4QAA]

Or he can learn to be a better pilot so he won't crash.

[@TheSoaringChannel]

There isn't any vibration with this new Solo and Jonker developed engine. None.

[@bad71hd]

Dope

[@StickandGlider]

I'll take 2, please!

[@TheSoaringChannel]

I'd love to test fly one sometime in the future. Let Attie know ;) haha! I would really love to have a lightweight single seater SLS. My DG505MB is killing my back every time I assemble it. I'm getting better at it, and eventually I'll be able to do it on my own. But man those wings are heavy! What does each main wing panel weigh? I've seen a JS1 get derigged and it doesn't seem bad.

[@CoinedBeatz]

they specify

[@dunodisko2217]

If it can propel itself on its own, then is it technically not a glider anymore?

[@timbaeyens4986]

Why was the landing executed with the engine out, prop brake / stop not engaged?

[@experimental_av]

assume to keep it simple.

[@jonkersailplanes3113]

The propeller brake function was tested in flight and it was demonstrated that the airflow will advance the propeller to the propeller stop. Inflight extension and retraction will be following shortly.

[@TheSoaringChannel]

@@jonkersailplanes3113 makes sense. Baby steps.

[@StickandGlider]

Good question. I wasn’t sure if the camera frame rate was just matching prop speed.

[@jeanvis5915]

When do you expect an electrical version?

[@realpokski]

Shouldn't be long until the electric JS3 RES flies :)

[@everythingforyou8188]

What type of engine you’re using

[@TheSoaringChannel]

A new variant of the Solo 2625 O2i

[@lucasparapaguimaraes255]

Beautful I'm Brazil...

[@Mike-Bell]

Dit lyk vir my asof julle channel "safe for kids" or "made for kids" ingestel is. Dit blok die moontlikheid om die bell notifications aan te skakel. Ek sal graag he KZbin moet vir my onmiddelik laat weet wanneer julle nuwe video het.

[@williedutoit3372]

Is this better than the jet propulsion ?

[@realpokski]

It can self launch and has longer range. But is more complex, takes longer to start engine and is not as cool as a jet :)

[@TheSoaringChannel]

Pluses and minuses to each system. The jet runs through A LOT of fuel quickly and cannot self launch. The exhaust if idling on the ground has been a problem for some. But the gas engine vibrates and shakes etc and is loud as sin and burns oil. It's all a trade. Right now the 2 stroke engine is the best all round option.

[@soaruk3697]

@@TheSoaringChannel or maybe the rotary? Schleichers self launch ASH26, 30, 31, 32 are rotary engines.... smoother

[@90secondsofaviation86]

Can JS3 self launch with its electric propulsion?

[@realpokski]

Yes, but not at max weight And it hasn't done it yet, that's what I'm really waiting to see :)

[@90secondsofaviation86]

@@realpokski hm, is electric propulsion new to JS3 or just so dangerous nobody tried it

[@realpokski]

The Antares glider has been capable of electric self launch since 2003, with good success. But it's an expensive and heavy glider.

[@90secondsofaviation86]

@@realpokski Is the JS3 FES gonna be better in these aspects then? I couldn't even find JS3 price tag to be honest

[@realpokski]

@@90secondsofaviation86 a JS3 is not cheap 🙂 But it's less than the equivalent German gliders.

[@lukabevk4276]

first :)

[@kirkmason7079]

The heavy beat of music makes the idea of sailplaning senseless

[@darkredvan]

Sounds not that much different to a SF-27 M many moons ago. Self launch capable too.

[@soaruk3697]

yep but the js2 probably glides as well as the SF27 will ever, at 120knots

[@darkredvan]

@@soaruk3697 Well, ~55 years of R&D should show. 😀👍 Now it is a proven solution, back then it was a test, trying out new ways of powered gliders. (the engines were far from reliable in the 1960‘s, improvements everywhere.

[@airasj1]

@@darkredvan Yes, in essence it is exactly the same. The problem however is that with 55 years of R&D, the self launch engine systems are still very unreliable. If you search on the net you can find a some research than shows the average reliability of self launch systems give a mean time between failures of about 5 hrs. This is more or less the same for electric systems ( surprise to me). This is really bad and stems from the vibration of the 2 stroke engine and general complexity of the system. So for the JS2 system we spend a lot of time to try and find better solutions for the vibration problem. Only time will tell if we have succeeded. If you look at our system is looks superficially the same as other systems, but is really quite different in how the system kinematics work and how the engine is attached to the airframe. So in time we will see if our is solution gets a better mean time between failures....

[@darkredvan]

@@airasj1 Thank you for your kind answer. I remember - though a kid at that time- when the first self launching gliders in the mid-1960‘s were coming around. At that time my father went for gliding in the Austrian alps at Aigen, a former Luftwaffe airfield of about 1200 m length (and ~1000 m width). 1. example was a SF 25 A (with a 2-stroke engine, Hirth IIRC), the high wing one. Take off with 2 people on board, climb rate near nil, at the end of the 1200 m barely 10 m height, always had problems with the engine performance, finally Scheibe used a 4-stroke engine on the SF 25 B which solved the problems. 2. same time frame, friends of my father owned a brand new SF 27M, same airfield. During 2 weeks they only were able to do 3 or 4 self-launched flights due to endless engine problems, fuel problems, spark plug problems. A small scooter garage‘s mechanic told them to use different spark plugs, the original ones used by the engine manufacturer might be the wrong ones. Miraculously it helped a lot. 2-stroke engines are great, but they are a different kind of fish in comparison to 4-stroke ones. The SF 27M based at our home airfield had endless engine issues due to foul fuel, spark plugs, carburetor clogging, clogged fuel lines etc. and notoriously loose bolts and screws. Many landings out in a field had to be made because the engine simply refused to (re-)start in flight. Well, I am sure a lot of problems / things were improved and solved in the last number of years. I wish you all the very best with your new approach, your new glider. Sometimes it is essentially necessary to look at a problem from a different point of view. You are building great gliders, and I am quite sure JS-2 will be a great success too. All the best from Germany, Michael. 👍👍.

[@jcornscorndog941]

Why? Just use a normal plane at this point.

[@jcornscorndog941]

@AdventureDog a normal plane doesn’t have to glide because it has an engine. I don’t need to be a plane surgeon to understand that. The whole point of a glider is that it doesn’t have a propulsion system, it glides. At this point it’s just a plane with extra steps.

[@realpokski]

@@jcornscorndog941 That's like saying, what is the point of sailboat which has a motor (which is almost every sailboat today), just get a powerboat. The idea is to use as a pure sailboat/sailplane for 95% of the time, but have the convenience of the motor when needed.

[@jcornscorndog941]

@@realpokski what actually is the point of a sailboat with a motor? If you’re going to have a motor on your boat than get a speedboat if you want a propeller on your plane get a normal plane.what is the point of experiencing any of these things if all your going to do is take the challenge out of it?

[@realpokski]

@@jcornscorndog941 Guess you're just trolling, so probably shouldn't waste anymore time. Suffice to say, many glider pilots do see the the advantage, and do buy gliders with motors. This glider is for them.

[@StickandGlider]

One could make an argument that the SLS on a "per seat mile" basis is much more eco friendly than a single engine avgas powered airplane.

[@tomasinacovell4293]

The "music" is annoying and idiotic.

[@biondanishgenomeinstitute8193]

Distracting musac again .. pity