RE: phoenix decathlon
It seems that I am the only one checking this thread. What happened did you all crash the decathlon?
Well after much tweaking I found that the problem seems to be with pressure. I found that the remote needle had a fracture at the back plate where the needle holder comes out and this was causing some problems. I accidentally broke the remote needle holder arm as I was trying to figure out what was happening.
I decided to tighten up the back plate screws, drill two holes in the remaining piece of the needle holder and screwed it to the fire wall. I tested the engine and all problems are now going away.
I still get some bubbles but as soon as I accelerate they immediately disappear. The other change that I did is that I am now running about 500 rpm lower by richening the mixture. And last I changed to 10% nitro with castor oil. This combination seems to work best. I am turning a 12x6 at 11200 (+-150). So far I have 3 flights and no dead sticks.