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Model Forum / Radio Controlled / Air Models / May 2004Quiet engine
I recently posted message concerning the Sig 1/5 scale Cub and recieved a very good responce. Now I have another question. How can I find reasonably quiet running .25 engine for my 1/6 scale cub also by Sig. I have previously built the 1/6 size and powered it with 10 cell and a geared motor and an 12/8 prop. But this time I would try a .25 engine. Any ideas. Carl Anderson. Delta B.C. Can. On 5/14/2004 12:23 AM Ted shuffled out of his cave and grunted these great (and sometimes not so great) words of knowledge: To minimize noise, use an efficient prop. APC is quieter and more efficient than MAS. The blade shape and width also affect the noise. I reduced the noise on my 46 FX by about 8db just by switching to an APC from a MAS. Also check after market mufflers. Many of the after market mufflers are a lot quieter than stock mufflers. Be aware though, that the quieter mufflers USUALLY rob power from the engine. > I recently posted message concerning the Sig 1/5 scale Cub and recieved a > very good responce. Now I have another question. [quoted text clipped - 6 lines] > Delta B.C. > Can. >I recently posted message concerning the Sig 1/5 scale Cub and recieved a >very good responce. Now I have another question. [quoted text clipped - 3 lines] >geared motor and an 12/8 prop. >But this time I would try a .25 engine. Any ideas. Carl- The K&B .28 Sportster is the quietest 2-stroke engine in the class. The OS .26 and Saito .30 4-strokes are both nice little engines, and swing larger props at lower rpm, which is key to keeping the noise down. For a Cub I would go with the 4-stroke just because the sound of it fits the character of the airplane so much better. Comes at a price though, about $100 US more than the K&B. Abel > I recently posted message concerning the Sig 1/5 scale Cub and recieved a > very good responce. Now I have another question. > How can I find reasonably quiet running .25 engine for my 1/6 scale cub > also by Sig. Use electric. very easy size to find. Almost silent, and just as powerful. > I have previously built the 1/6 size and powered it with 10 cell and a > geared motor and an 12/8 prop. > But this time I would try a .25 engine. Any ideas. > Carl Anderson. > Delta B.C. > Can. We noise test all our models at our club. The OS LA series are very quiet, and adequately powerful for a Cub. The OS 40 LA is both small and light so it may be OK - although apparently oversize - in the Cub. Just turn a bigger prop with it. Otherwise the latest Irvines are quiet but more powerful than the LA's.. My Irvine 36 turns an 11 x 7 APC well and the noise is 75 dbA at 7 metres - and it is a superb throttling engine. C W >> I recently posted message concerning the Sig 1/5 scale Cub and recieved a >> very good responce. Now I have another question. [quoted text clipped - 9 lines] >> Delta B.C. >> Can. I also recommend the K&B Sportster .28. Almost as quiet as electric. Lots of power, and more power to be had if you at a 12" exhaust extension tube (silicone rubber recommended). The engine is out of production but can be found on eBay. Earle > I recently posted message concerning the Sig 1/5 scale Cub and recieved a > very good responce. Now I have another question. [quoted text clipped - 6 lines] > Delta B.C. > Can. |
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