Well the subject says it all.

Is there a table or a rough rule of thumb where I can see the comperable size glow vs gas.

I realize that each plane size has their ideal engine, but still there are a couple of glow engines in the 120-220 bracket that could be changed for a gas and/or the other way around.

Although most folks have an opinion on this subject, not many are willing to suffer the debate that follows after said opinion is posted.

Which size glow engine are you trying to replace with a gasoline engine? The larger the better.

I'll start the fracas by stating that it takes a good 40cc gas engine to replace an OS 1.60 FX glow engine. Many will agree that a 26cc gas engine can sub for a 1.20 four-stroke glow engine (non YS).

Of course, because the gas engines are usually heavier than the glow engines that they replace, the model's performance suffers a bit, but this has been improving as time progresses.


Ed Cregger

a 150 whether its a two stroke of four stroke is so close to a 25cc gas engine that you cannot measure it with a micrometer.

Hi,

There is simple example and tested manufactured experiement = MVVS.
MVVS 26-Gas and 26-Glow have the almost same weight, deliver the same power
and in fact seem to be more benefited from Reson.Exhaust than OS160, i.e. the
whole debate gets near to F3A class. Still most of the F3A folks fly Glow, and
then some fly Electric and almost nobody fly on Gas. Conclusion seem obvious
from performance point of view - for me Gas makes very good sense for the
displacements like 80cc or more. For less than 50cc, better stay on glow.

Just we are just debating that on another Discussion and that might save
some time here:

http://www.rcuniverse.com/forum/fb.asp?m=6218653

Well, my own choice goes after cost-and-comfort i.e. : Depending on the
Cost-of-Fuel (Ready or Home-made) and also the Ignition sys.Cost, there
is a "Gray-Scale-Range" of 20-40 cc where everybody's opinion is correct.

Cheers,
Nick