I'd like some input from the group here on an engine recomendation for a King Kobra kit I have ordered. I love my little Kobra so much I wanted to go with it's bigger brother. I have had very good luck in the past with O.S but am learning to love my Super Tigres after getting better at engine tuning. I haven't any experience with any of the other manufacturers. My requirements are plenty of power but I'd like to not break the bank - when the kit arrives it will be a suprise to my wife After the F18 I ordered I'm on shall we say the thinner part of the ice.....

Please no this or that is junk, I know better than that - just some honest recommendations.

Thanks a bunch,
Dan

I honestly think the OS AX .55 is the perfect engine for this plane. Remember, this plane was designed around the lighter, small-case sixties of yesteryear. Many of today's sixties are basically ninety-size cases and a lot heavier.

That's interesting. I looked up the specs on Tower and see that it is very comparable to the S.T. 61 in HP but much lighter. If I say I plan to put retracts in the plane would that sway you at all??

Thanks,
Dan

Thunder Tiger .61 Pro

With the added weight of the retracts I'd definitely go with the lighter .55. Higher wing loadings never really fly better.

Dan , The engine choice for the KKobra entirely depends on the kind of performance you are looking for. It can be an excellent precise pattern flyer with any two stroke .61 , however if it is speed you want then go with a .91 fx with a tuned muffler or a Jett 90.
I have two KKs one with retracts and one with fixed gear and they are both powered with 91 fx and Nelson ultrathust mufflers driving APC 12X10 props . I believe this is the best combofor power and reliablity.
The Sig KK is one of the best flying kits in the market so I would not hesitate to invest a few more $s for the right power source. I advise you to stay away from the 55AX which would be ideal for the Kobra or the Cougar.
Keep us posted.
Kal

Fox .60 Eagle 4

Are 4-strokes not a good match for this airframe? I noticed that the Thunder Tiger F-91s is actually about 3 oz lighter than the Thunder Tiger Pro .61 2-stroke. I was actually leanining toward the TT F-91s for mine (I have a brand new one sitting around looking for a home), but a Super Tigre G-61 or Thunder Tiger Pro .61 would seem to be a more popular choice for this airframe.

I also run a King Kobra with the .91 FX, Macs tuned pipe, and turning a 13x7. It used to have a piped .91 FX, and now its night and day difference. It does a nice unlimited vertical, and huge loops. I love how when doing a low knife edge fly by, you can hear the air ripping. .91 all the way.