I just got a Cox 049 with a Davis Diesel head running. It runs a bit
inconsistently; I'm still trying to sort out the best tuning that'll
give me a good flight. It tunes well on the ground, but in the air it
definitely unloads and starts to 'cackle' like it's under-compressed,
although it could be too rich; I suspect not enough compression because
usually an engine leans out a bit in the air.
It also puts out a lot of black gunk in the exhaust. I don't remember
this happening the last time I had that head on an engine, but Jimmy
Carter was president then so it may have spewed ink all over everything
for all I can remember.
Does any one know what the black stuff in the exhaust may be? And
should I expect the think to need a bit more compression in the air than
on the ground?
It's running a 7-4 prop, on a control-line trainer.
--
Tim Wescott
Wescott Design Services
http://www.wescottdesign.com
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"Applied Control Theory for Embedded Systems" gives you just what it says.
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