RE: O.S. GF40 4st gas
Iv'e been flying it on my new Giant super sportster and it's getting better every flight!
About 10-15 flights so far and it pulls like crazy! 19-8 Xoar laminated is what it seems to like so far.
Running Klotz kl-100 synthetic oil at 32-1 so it still smells like a model plane.
It runs very smooth, doesn't shake the crap out of the ailerons or tail at idle, plus it's quiet!
Everyone that sees it at the field wants one.
Mark