ORIGINAL: rcflyer96
Hey guys, new to gas and have two flights on my DA50. The engine has about 5 gallons through it, and I am running 50 :1 Amsoil in it right now. It will swing a Menz 22X10 @ 6250 and a MSC 22X8 at 6900. This is with a Bisson pitts.
Do these figures seem about right?
Also how much would I gain by going with a Stock muffler? And lastly what could I expect a Mejzlick 23X8 to turn at?
Thanks Alot!!
Unless you are trying to power a Comp-Arf 2.3 or heavy pig don't worry about the RPM. This engine will produce enough power on a stock muffler to haul a 16 pound plane into space. Tune the engine by ear to the max RPM, back off about 200 and forget about it!
Slimline pitts muffler - excellent power, not too loud, easy to tune
DA Muffler- a little more power, louder, fairly easy to tune
1/4 wave pipes (KS, etc) - quite a bit more power, harder to tune (requires moving pipe in and out to find the node) needle settings are more critical too (easy to overheat)
The DA50 has more power than you will probably ever need ... I am not sure why so many people get hung up on getting every last RPM out of it.
The best props to use on this engine are a Menz or Bolly Wood 22x8, Mejzlik CF 23x8 or NX Wood 23x8 Don't use a 22x10 - too much prop.
If you don't believe me on the RPM or the props.. call DA.. that's right from the horse's (er, Brian and Dave's) mouth...
Also - the "carb mod" made no difference in the RPM, if there is a diff its probably due to the needles still being too rich. DA's run best leaned out on the low end and just under peak on the high end. The carb mod was made to prevent fuel from pooling in the reeds during idle (resulting in dead sticks) it had nothing to do with WOT performance.
I never tach my engines, total waste of time. If my engine starts great, has excellent idle transition, top end, runs cool and takes the plane straight up out of sight... who the %^%$ cares what the RPM is.... !
DP