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WHAT ENGINE TO USE

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WHAT ENGINE TO USE

Old 04-15-2010, 04:17 PM
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billberry189
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Default WHAT ENGINE TO USE



Hi Guys, I have been away from the R/C aircraft sport for sometime and I am not familiar with today's engine technology. I am currently building an old (circa 1975) Sterling Fokker D-7 war bird and I am wondering what OS Engines has that will both fit and power this bird adequately. Any suggestions would be greatly appreciated. Thanks

Old 04-15-2010, 05:20 PM
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aerowoof
 
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Default RE: WHAT ENGINE TO USE

fs 91 0r 75ax
Old 04-15-2010, 06:51 PM
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ChuckW
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Default RE: WHAT ENGINE TO USE

What's the size and estimated weight of the airplane? To me, that D-7 wouldn't be right unless it had a 4-stroke in it. I think it would just sound more appropriate.
Old 04-15-2010, 06:52 PM
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Crash Campbell
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Default RE: WHAT ENGINE TO USE


ORIGINAL: aerowoof

fs 91 0r 75ax
Hi,

IMHO the four strike is more appropriate not that there is anything wrong with the 75AX but four strokes have that sound.

Cheers,

Colin
Old 04-15-2010, 08:48 PM
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Gray Beard
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Default RE: WHAT ENGINE TO USE

And if you want you can change the sound of the four stroke just by using the stock header and adding flex tube to it and changing the length until you hit the sound you like. They sound pretty cool without the stock mufflers.
Old 04-16-2010, 06:05 AM
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billberry189
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Default RE: WHAT ENGINE TO USE

Thanks for the input guys! My bad, I forgot to include that a 45 to 65 engine is Sterlings suggested engine size and that the weight should come in at 8 to 10 lbs. BTW the engine size is two cycle as there weren't many 4 strokes back in 1975 when I purchased this kit. Yes, I've been carrying it around for 35 years. LOL
Old 04-16-2010, 08:49 AM
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Default RE: WHAT ENGINE TO USE

Bill, be pretty careful about your engine choice.  With a kit like that, you almost want to pick an engine based on weight rather than anything else.  I'd suggest determining how much weight you need to have the CG within range, and then determining your engine with that in mind.

Power-wise,  the suggested engines may be a bit much for a WW1 biplane of that size.
Old 04-16-2010, 01:06 PM
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Default RE: WHAT ENGINE TO USE

What MikeL says is true, however... WWI birds had BIG, HEAVY engines (with very little power by today's standards) so they had relatively short noses. This means that a modeled version can handle the weight of a large engine (and usually needs additional nose weight) - AND, they had huge, kite-like wings, so they can usually lift that extra weight plus a piano or two..

This plane sounds similar in size to a Sopwith Camel that I had. The plane flew very well with an OS 70 4-stroke and it was still more power than it needed.

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