TOMAHAWK , does anybody now the eqivelent gas engine for a 75 2 stroke,15cc,20cc or 26cc. thanks

Try This... http://www.unitconversion.org/volume...onversion.html

A .75 cubic inch engine converts to 12.2 cc's

so it would be the 15cc, thanks

mathematically yes, but nitro engines have a higher output per a given displacement, if the plane can handle the weight a 20cc would be more equal power wise