I do not see much difference in the choice of engine volume 10cc.
I is the second model in the photo is used with engine 10cc.
The first was Evo10.
Two days ago I flew model RCGF-10.
Both times the weight of the model will receive 2700 grams.
Both times I had the engine power for 3D flight.
Wingspan 1540mm models.
But in this model, I do not see options to set the 15cc engine.
The reason - the weight of the model will be more.
And this model gives its excellent performance with low weight.
Engine selection from the family of 10cc?
I got almost the same power with NGH-9, Evo-10 and now RCGF-10.
But there is a big difference in the ease of tuning the engine among these brands.
I have no O.S.-10.
From what I have a, I like RCGF-10.
But it has two drawbacks.
One I voiced -
http://www.rcuniverse.com/forum/gas-...cc-engine.html
Second - hard to pump fuel into the carburetor for the first time.
There is no carburetor choke.
Therefore, to release the air from the chamber of the pressure regulator has to close or finger, or press the membrane through the hole of the lid.
This should be done only once before the flight.
Subsequent launches take place with two turns without this procedure.
This is the only moment RCGF-10.
Perhaps the power of the engine still rises.
Because if it counted the amount of the correct standard - this engine has a volume of 12cc.
But you choose.