I found a kit that I would like to build. As I was re reading the tech specs, it says the plane is for a .19 - .39 engine. What are the ramifications of building that plane and using an existing .45 engine?

Most of the time it will be fine. Just be sure to keep CG in the right plane.

What plane is it? You dont see very many planes with that size engine recomnedation.

A little extra power doesn't hurt. You can always pull the throttle back and cruise around but if you get into a jam, it's nice to have that extra power to pull you out. As mentioned, pay attention to the CG.

That's quite a variable, 19-39. Extra power can be ok but also must be concerned with extra weight, structural integrity and CG as mentioned. Off hand without knowing more about plane I would not recommend a 45 engine.

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I wouldn't worry about it. If it will fit, put it on. Just make sure that you are allways aware of the power. Start out with min throttle till u get used to it and then increase as u get more used to it. I've been flying a kit built Sig Kadet recomended motor was a .25, (plane is over 30 yrs old) with an O.S. .60 and it flys great. The only thing I added was alerons.>>>-> Bill

The kit is a SIG Kobra. Correct balance has always been a priority when I build a kit. I am a part-time flyer right now, so a well balanced plane compensates for wanting skills.

Thank you all for your input and encouragement. [sm=thumbs_up.gif]

Hi my friend, I also have the Kobra with an o s .60 and no problems with balancing . Flys great!

Is that a Kobra or King Kobra BassFish?

I think you could put a .45 in the small one also, but a 60 sounds big...

It is the Sig "Kobra kit" ws-45in. recommended engine, .19 to .35

wow, how did you like it?