ORIGINAL: RTK
ORIGINAL: vanguard
guys read my original post. I didnt ask how to tune an engine. I normally tune them when new and forget them. Hate to mess with needles unless really necessary. Our weather has been very very hot and humid the last two weeks. I noticded that my DA85 started to sag a little after about 10 minutes in the are. Normally sagging would indicate a lean condition..
guys
Sagging is different than loss of performance. If you notice this after about 10 minutes you are probably getting it a little hot. Reasons have already been mentioned for this but I would bet it has more to do with air flow and cooling than the needles. You should not crutch or compensate the needles for poor cooling.
I have posted this many many times, it is useful for every modeler to look at.
http://www.prme.nl/forum/viewtopic.php?p=506#506
I am building a round cowl setup right now. When done, I will expand the cooling post with pictures. I still must solve the carb/air filterintallation. Plane is for towing duty, so the engine runs prolonged WOT at lower speeds.