well...

It runs. Not flying yet, but broke in the engine. I had a terible time getting it to start. I must of cranked it 1000 times and couldn't get it to fire. In desperation I called my good friend Cyberwolf and we worked on it together. He determined we had a leak in the diaphram and we finally got it to run. After we fixed that it ran good.

We ran it for 30 minutes or so. Final numbers were about 6650 RPM with the 21x8 prop. Cyberwolf thought that was pretty good. I was hoping for 7000 RPM. These readings were using an engine that only had 30 minutes run time and using the break in oil mixed at 30:1. Does anybody have an opinion on whether or not the RPM will increase with additional run time and also when I lean the mix down to 40:1? Do you think it will get to 7000?

When I got home from Cyberwolf's I started the engine myself, just to see if I could get it to run. I did. Seems to start fine now. I also put my trusty fish scale test to it and got a peak of 19lbs 0ozs of thrust with it settling back to 18lbs 8ozs of thrust when the engine settled down at full speed. I only ran it there for a few seconds but I did the test several times with the same results. What kind of thrust would on normally see from a 50CC class engine. Keep in mind my elevation is 4800'. Any opinions on whether or not this will increase with break in also?

My plane weighs 13lbs 5ozs so I have about 1.38:1 ratio. It will hover but I'm uncertain about pull out. What do you normally expect?

I'll do the maiden on Friday or Saturday and give a report.

Thanks for all the help here and especially for Cyberwolf who help with the engine after I was about to give up.

Barry