Quote:
Originally Posted by wingburner
Jim, in the vids there's an extreme amount of bark coming off the MSC.
Trevor talked with Mike at length yesterday and like you say he sold his whole setup. So he never come up with anything special.
Asked about 11' pitch props but no chancy..
To me on most props I've tested even for the 100cc class, the jump from a 10" to 12" or 8" to 10" pitch is very substancial.....I wish they could give us more pitch options all the way down to the 40cc class.
Oh well the search continues for the ultimate prop.
Wish Trevor would open his wallet to a couple more
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No more wallet opening on this end Jack - The wallet open ups, but there`s nothing left inside!! I now need to behave really, really well at home and keep the dust down and "the boss" may just give me my allowance!!
I agree though Jack - the 11" pitch options IMO are extremely important!
What we`ve seen so far in the testing of the 4 cylinders is that they have so much torque that it`s very tough to load them up to keep the RPM`s down (and hence tip speeds). If you go to a 30" prop to keep tip speed down, you would need a 13 or 14" pitch to load these monsters up and then the plane feels fast (a mix of personal experience and some research)! Go to a bigger prop and the motor doesn`t drop many RPMs and tip speed gets so high and they push an insane amount of air!!!
I can`t believe I`d ever say this, but these motors almost seem a bit too big for a 44-45lb plane unless it`s a plane used in high power situations like IMAC. It would likely be much easier to prop for a 50lb plane for what Jack and I do - 3D and sport flying! (Jack - I have an idea for your next plane!!)
Seems to me that ideal prop would be a 31x11, 32x11, or perhaps a 33x11. 3-Blades are an option, but it get`s really expensive doing a $300.00 test on this size of prop!!
IN SUMMARY - PROP TESTING IS FUN, BUT $$$$