[Skidoo55]

I have to repair mine, the wing came off in flight, and the plane lawn darted into a farmers field. Suprisingly, I survived largely intact. I have an OS 25 FSR on it, which was good, but a little more speed would have been nice as well. You'll be fine with a 25 in it.

[MJD]

BTW, there are several examples of Kobras that have been fitted with .46-.50 engines, including Sport Jett .50's (i.e. 17k on a 10-6) which will pull the thing into the 125 range or so with that thick wing. I've flown one with a .46 (not mine) and honestly I didn't find the engine weight and landing performance to be anything scary. It's no Kadet but it is not a nightmare by any means. Depends what you want it to do.

[pep]

That is one plane i always wanted to build, would one of you guys still have the plans for it.
Thank you. Phil

[MJD]

https://sigmfg.com/collections/sig-r...nt=46025615241

$6.99 at SIG.

[floyd]

Originally Posted by MJD

BTW, there are several examples of Kobras that have been fitted with .46-.50 engines, including Sport Jett .50's which will pull the thing into the 125 range or so with that thick wing. I've flown one with a .46 and honestly I didn't find the engine weight and landing performance to be anything scary. It's no Kadet but it is not a nightmare by any means.

My own Kobra with a 46 in it stalled and dropped fast on landing when you slowed it down. That's with the battery as far back as I could get it and the servo's as well. The CG was very close to the recommended location. When I put the GMS 32 in it and moved the battery back to the front my first landing was so easy. Again the 32 is 6 ounces lighter than the 46 and the Kobra is a small light plane. Performance wise the 32 is just as fast as the 46 was. Looking at the wing, when you calculate the built in taper its not that big of a wing area.

On a Big Stick 60 I bought ready to fly with a OS 75AX engine in it, my first landing was hard as I had no elevator, it just fell out of the sky. I increased the elevator throw and tried again with the same result. So I increased the throw again with the same result. The CG was good so I started shedding some weight from the plane. I removed 8 ounces of weight In total and what a difference in the planes landing performance. The extra weight alone was the problem with landing. The engine swap I did shed 5 ounces of nose weight. I now have elevator control when I land. It seems to fly the same as well. Cheers Floyd.

[MJD]

They don't like a trainer for sure, but on any decent surface they can be landed fine. There are far more difficult aircraft to land than a hopped up Kobra. Folks overpower them for the obvious meat-headed reasons, but the thick wing holds it back so the net gain is not as impressive as it could be. For sure, it is a more well mannered aircraft with the proper weight powerplant in it. All depends what turns your crank and what you want it to do.

[stuntman]

I flew mine with a OS 35FP. Just be aware that this plane does a wicked snap if you slow it down too much. Therefore, keep the speed up when you land.

[floyd]

Originally Posted by stuntman

I flew mine with a OS 35FP. Just be aware that this plane does a wicked snap if you slow it down too much. Therefore, keep the speed up when you land.

Mine doesn't snap at all when I slow it down. Must be the CG location.
The worst plane I ever flew for snapping was the Great Planes Super Sportster 20. The location of the servo's made it a top heavy plane. Cheers Floyd

[HAL9KPCM]

Ya, I never had a problem when I had mine, slowed down quite nicely.

Funny story about a guy in a Sig group on Facebook. He got a Kobra that somebody had scratch built. He had a friend fly it and he said it was a horrible flyer. Wanted to tip stall, snap, poor low speed performance, but it flew great upside down. Turned out the wing was built upside down.

[MJD]

It shouldn't be snap happy as a general personality trait - something was up. I just inherited a few things including an older Q500 racer where the left wing panel had been installed upside down, and this is not a symmetrical airfoil. Apparently he still flew and raced it.. I may pass.