James, I've never owned a 1.80 but have a high compression 1.50, (11.24 to 1), I run Master Airscrew Classics or Mejzlicks on it for that reason. It has C&H Ignition on it now, it's a ***** cat.Picture #2 is what the 1.50 will do to a Graupner 16x8 when leaned a little too far.
Last edited by Hobbsy; 03-21-2015 at 11:46 AM.