bignos Posted November 16, 2009 Share Posted November 16, 2009 i want the best power from my "new" motor (im building a paramotor) it came from a fly products power plus (its an mz34) with a 1:2.2 ratio reduction, by my calculations the tip speed is slow (.56 mach) that seems a bit slow?? even if i up the prop size to a 130 it only goes up to .59 mach. My limited understanding is that it should be running at about .9 Quote Link to comment Share on other sites More sharing options...
fanman Posted November 16, 2009 Share Posted November 16, 2009 It's actually higher than most paramotors. Most run between M0.4 to M0.5 unlike light aircraft that often do M0.9. Quote Link to comment Share on other sites More sharing options...
bignos Posted November 16, 2009 Author Share Posted November 16, 2009 It's actually higher than most paramotors. Most run between M0.4 to M0.5 unlike light aircraft that often do M0.9. lol, you know your stuff!! thanks Quote Link to comment Share on other sites More sharing options...
Phil_P Posted November 17, 2009 Share Posted November 17, 2009 I would think that prop choice would be a factor, as your prop and redrive combo presumably want to be chosen to load the motor so it runs at the 'best' revs. Best in this instance might be your selection that gives perhaps the best rate of climb, best cruise speed, or optimum fuel economy. Personally, I would probably choose a combo that would load the motor such that it is held to around it's peak power RPM. Phil Quote Link to comment Share on other sites More sharing options...
t_andrews Posted November 19, 2009 Share Posted November 19, 2009 Get thee a ground adjustable prop. Quote Link to comment Share on other sites More sharing options...
fanman Posted November 19, 2009 Share Posted November 19, 2009 Get thee a ground adjustable prop. +1 Why let everyone else tell you what pitch you should be running when no 2 engines perform the same. Quote Link to comment Share on other sites More sharing options...
bignos Posted November 19, 2009 Author Share Posted November 19, 2009 where do i get a ground adjustable prop? that would be ideal Quote Link to comment Share on other sites More sharing options...
t_andrews Posted November 19, 2009 Share Posted November 19, 2009 It's been discussed already here elsewhere but here are some options: 1) http://www.ultralightprops.com/tech_ser ... adjust.htm 2) http://ivoprop.com/mediummodel.htm 3) http://www.warpdriveprops.com/ Some offer inflight adjustable kits. Please do post something on them of you decide they're for you. Quote Link to comment Share on other sites More sharing options...
pete_b Posted November 19, 2009 Share Posted November 19, 2009 where do i get a ground adjustable prop? that would be ideal Ran one on my Simonini and I could put a slightly courser pitch in If I was just boating about (dropped the revs so used less fuel) or finer pitch to get quicker response when flying low, low means Low. I ran the two blade http://www.ultralightprops.com/ppg_prop ... adjust.htm Quote Link to comment Share on other sites More sharing options...
pete_b Posted November 19, 2009 Share Posted November 19, 2009 I think I may have a complete repaired one still here some where? Quote Link to comment Share on other sites More sharing options...
bignos Posted November 19, 2009 Author Share Posted November 19, 2009 when flying low, low means Low. im interested if you do have one lying around... is it repaired because of the above quote!! Quote Link to comment Share on other sites More sharing options...
pete_b Posted November 19, 2009 Share Posted November 19, 2009 when flying low, low means Low. im interested if you do have one lying around... is it repaired because of the above quote!! Dont take off with a 6 foot high tree 20 foot in front of you Yes I have it just the tips needed a little work, blades are now white. Price ? make me a reasonable offer (you can PM it if you like) Quote Link to comment Share on other sites More sharing options...
bignos Posted November 20, 2009 Author Share Posted November 20, 2009 i dont know how much they are new?? what size is it? you must have some idea if you have 2?! Quote Link to comment Share on other sites More sharing options...
pete_b Posted November 20, 2009 Share Posted November 20, 2009 i dont know how much they are new?? what size is it? you must have some idea if you have 2?! Approx £200 + import tax 125cm If I remember right I will measure it tomorrow if I remember Quote Link to comment Share on other sites More sharing options...
bignos Posted November 20, 2009 Author Share Posted November 20, 2009 could you ring me tomorrow? 07743899090 or i could ring you if you have a no.? Quote Link to comment Share on other sites More sharing options...
pete_b Posted November 21, 2009 Share Posted November 21, 2009 could you ring me tomorrow? 07743899090 or i could ring you if you have a no.? 07703381197 Quote Link to comment Share on other sites More sharing options...
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