What would be the equivalent Gas Engine Size to Glow Engines: 40-46 Glow, 60 Glow, 90 Glow and 120-150 Glow?

10CC equals .60 2 stroke glow

So far there are none for the little glow engines, there are some new .15cc people are using in 60 size to 90 size planes. A 1.20 glow is 20cc, I have a 1.40 gasser that is 22cc, a 30cc is a 1.80 and afterr that I have to start doing that math stuff. I haven't seen a chart published yet but I have seen people do the math and chart it for there own hobby shops just for fun. As much fun as the little gassers are I don't go gas until after 120 glow. I know others that have been. I am old school and figured an 80 inch wing on a stunt plane called for a 40cc gas engine b ut that was after flying some big planes with the Zinoah 23cc. I have the old RC Showcase 1.40 or 22cc gasser but it is very high performance and I bought it years ago to test on different types of planes. It handles most any 1/4 scale stunt plane and I have it waiting for my next kit build, the Ultra Sport 1000 with an 80 inch span, That little engine turned out great for that type and size of plane.

There are 16.3 cubic centimetres (cc) to the cubic inch (ci). Glow engines are typically size in fractions of a ci and gas engines in whole ccs. Therefore:

0.40 ci = 6.52 cc
0.60 ci = 9.78 cc
0.90 ci = 14.67 cc
1.20 ci = 19.56 cc
1.50 ci = 24.45 cc
1.80 ci = 29.34 cc

... etc.

It's not as simple as just getting the displacement the same. Glow engines make more power for their displacement, so a gasser needs to be a little bigger to be a true equivalent. But then gassers typically make their power at a lower RPM which changes the way the plane responds to the throttle and what prop it needs. The change in prop brings a change in trimming, which may or may not make the plane fly better.

Looking at the math 10CC equals .60 2 stroke glow.
As said above anything over 1.20 glow I'd use a gasser. Fuel is cheaper and the flight time per gallon longer. As far as power goes a 16 lb Yak 54 with a 55CC gasser.will go straight verticle until I pull the throttle back.
Good Flyin to all

That's very true but it also applies when speaking of any different type of engine. It would be easier if it just stopped there. Brand and induction type also mater, if you put one brand next to another of the same size and prop there can be a huge difference. Then you have to factor in engine cost against the added power and quality/ factory/dealer support. Like most everything in this hobby, there is a big learning curve.

You're 100% right, Gray beard. It's not an exact science by any means. The only real foolproof way is to find someone running a setup that you're considering as ask how well it works for them.

Hey Guys,

Appreciate the replies and I fully agree that there's more to it than simple replacing the displacements, I was just looking for a general rule of thumb, in the ballpark numbers to steer me towards the close enough size gas replacement engines.

Thanks.