I have just found my new engine for scale. I use to run the .91 Saito 4 stroke glow, but not any more (at least for my new ships).I now have the gas 4 stroke, Saito FG-14B in my Ryan 200 special. The glow .91 burnt 10-12ozs. for a 8-9 min. run. The gas 4 stroke burnt 2.5 ozs. for a run duration of 17 1/2 min. rpm range for break-in was 3,000 to 8,500. While not broke in yet, I got it to idle at 2,000 rpm. This engine does have to have a little more room up front. It has it's own on-board battery, and the mag. box. but what scale ship can't use a little weight up front? AND, it sounds way-cool too. Can't wait to test fly it.

Blessings
Allen

Allen,
Will the gas engines typically turn a larger prop than the alchy's?
Will

This engine is smaller than the .91 glow and I used a 14X6 on it, the gas swings a 13X6 Evolution prop with a lot of tug. Pet Bergstrom can tell us more on that.

Blessing

Our prop of choice for the 14B is a 14 x 6 prop.  Yes - the gas versions do provide more torque than the glow versions so swinging a larger prop is generally not an issue with these.  We usually see 9000-9200 on this prop once it is fully broken in.

One word - baffle the engines (especially the upper head) for maximum cooling.

Pete