ORIGINAL: vbortone

I did try the Abbra (design for the ZDZ 40) around 8-10 years ago. I was able to compare the same aircraft with ZDZ 40, YS 160 and OS 160. There was at least 30% difference in power (glow more power). This was in the middle of humid summer that is the correct way to do it. I was flying the AMA Masters schedule in that time. The ZDZ 40 was having problems in some portions to a point that I was not able to use it. Clearly this could be a good option for lower classes in AMA. I will agree that we need 50-55cc with tuned pipe to get equivalent power of glow engines for 2 meter pattern planes. Meeting weight and noise is clearly challenging with 50-55 cc gasser.