Originally Posted by
Hobbsy
I tried a couple of different props on the little .30 just now.
Fuel===WildCat 10% full synthetic 18% lube.
Plug===Fox Miracle
Prop===Taipan 9x6 rpm==picture #1
Prop===MA 3 blade 8x6 rpm==picture #2
I don't think I'd fly either of those props. I guess the 10 or 10.5" Bolly's and or Graupner's are best.
Dan, I believe your the only person on planet Earth who stumbled onto a good setting for those poor excuse' for pumps. Not trying to be a bad guy.
Those pumps are a beauty in simplicity. All they do is convert the crankcase into an air compressor W/the use of check valves. Regulate the pressure, then find the proper needle settings.
The hard part is understanding the concept. If you fiddle W/things in the wrong order, you will end up chasing your tail.
When I bought my FA-300TTDP back in the late '90s, the 300 twins where very popular in large scale aerobatic planes, but everyone I talked to had mixture balance issues W/the single carburetor engines at idle. That's when I decided that the dual carburetor engine was the way to go. The engine runs fine W/the factory recommended pump setting but I have tweaked it a bit. One starts out @ the factory pump setting & maximizes the needle settings. Then screw down the pump a little until the engine sags from the A/F ratio becoming rich. Re-visit the needle settings by leaning them out again for maximum performance.