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Design => Stunt design => Topic started by: jim gilmore on July 16, 2009, 06:39:36 PM

Title: Just how big an engine......
Post by: jim gilmore on July 16, 2009, 06:39:36 PM

Ok well here is where my question  gets a bit hazy. If I go with an .09 or .10 that should be close to the right size. If I go with a .15 it might be a bit large but I'm guessing that by prop and venturi selection it can be run at what ever speed needed to fly The  model at the right speed. The weight difference is less than an ounce I belive.

Title: Re: Just how big an engine......
Post by: Geoff Goodworth on July 17, 2009, 05:30:57 AM

Jim

Which model? If it is the Akro, 1oz in the nose requires 2.2oz at the tail to balance. 3+oz of extra weight may make the wing loading pretty high.

Cheers, Geoff

Title: Re: Just how big an engine......
Post by: jim gilmore on July 17, 2009, 08:05:38 AM

Aside from adding weight. Couldn't wing position be moved to adjust the balance within reason.  I'm not talking about drastic changes here. And I know weight considerations are an issue. I'm not aiming to build a rock on a string. Though I could end up with one. I'm just trying to find ouf if a slightly larger engine would be able to slowed down/or controlled to fly at a slower speed through the use of prop and venturi size.