I currently fly only electrics (small scale and aero planes, and helis), but am thinking about trying ic-power so I can fly larger stuff in more wind.

I want to find the quietest, most scale-like fuel-powered model engine out there. So, before you all flame me for listing engines of very different sizes and power, please understand that I want to (do this backwards and) pick the right engine first, and then think about what plane.

Here are the choices I'm considering:

(1) OS FT-160 twin
(2) Saito 60 twin
(3) Saito FA 90R3 (3 cylinder radial)
(4) 4-stroke gas conversion (Ryobi 25cc or Honda GX31)

I know that none of these are for beginners, but I have a good engine test stand (PSP Mfg. -- awesome!) and don't mind fussing and tinkering.

Any thoughts out there? Any choices I'm missing? I would really appreciate the input.

Thanks.

I think you are asking for trouble starting out with multicylinder engines.

Thanks -- you may well be right. I guess I'm a glutton for punishment. Assuming I can deal with the trouble, any views?

I don't know about the 3-cylinder radial and the 4-stroke gas conversion, but the twin Saito's that I've heard at my field were louder than the single cylinder four strokes. Any 120 or smaller single cylinder four stroke engines will be relatively quiet.

Hi!
All ic engines on the market could be made to run quiet...not just those you mentioned...it's up to you as a builder of the model what level you choose.
Things that affect Quietness is ...silencer material ,volume and design, propeller size and shape (APC best of plastic props).


Regards!
Jan K
Sweden

I think Saito's are louder than OS right out of the box. I'm strictly a Saito man too. My experience is that the really small four stroke, like .45 and under, are terribly quiet. Especially if you put-put around. Be careful with the twins. Some come with straight pipes!

I don't own any gassers, but a local club has quite a bit of gas action. I can say that the loudest and the quietest IC model airplane I have ever heard were gassers. The "pros" set-ups are so quiet its eerie. Of course, some buffoons run open exhaust and run props with mach tip speeds. Good way to lose a field if you ask me.

To find the really quiet mufflers, you're going to have to do some searching. If you like to tinker, this could be a major opportunity for experimentation. This forum has lots of info if you do a keyword search.

Good luck.