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Putting a .45 engine on a .39 airplane kit

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Putting a .45 engine on a .39 airplane kit

Old 09-02-2008, 06:59 AM
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NoviceMikeG
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Default Putting a .45 engine on a .39 airplane kit

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?
Old 09-02-2008, 07:27 AM
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Gringo Flyer
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Default RE: Putting a .45 engine on a .39 airplane kit

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.
Old 09-02-2008, 07:43 AM
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Default RE: Putting a .45 engine on a .39 airplane kit

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.
Old 09-03-2008, 07:53 PM
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Default RE: Putting a .45 engine on a .39 airplane kit

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.
Old 09-04-2008, 09:48 AM
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Default RE: Putting a .45 engine on a .39 airplane kit

..
Old 09-04-2008, 09:56 AM
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Default RE: Putting a .45 engine on a .39 airplane kit

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
Old 09-05-2008, 05:22 AM
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NoviceMikeG
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Default RE: Putting a .45 engine on a .39 airplane kit

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]
Old 09-08-2008, 07:43 AM
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bassfish
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Default RE: Putting a .45 engine on a .39 airplane kit

Hi my friend, I also have the Kobra with an o s .60 and no problems with balancing . Flys great!
Old 09-08-2008, 10:37 AM
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daven
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Default RE: Putting a .45 engine on a .39 airplane kit

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...
Old 09-08-2008, 11:17 AM
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bassfish
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Default RE: Putting a .45 engine on a .39 airplane kit

It is the Sig "Kobra kit" ws-45in. recommended engine, .19 to .35
Old 09-08-2008, 12:53 PM
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Default RE: Putting a .45 engine on a .39 airplane kit

wow, how did you like it?

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