george1966 Posted November 5, 2014 Share Posted November 5, 2014 Here we go again, I have changed my 3 blade prop system on my macro 2 for a 2 blade. I purchased a new pulley from parajet which I believe is for the compact and have purchased an after market carbon 125 with a reduction of 2.7 prop. I went for a fly tonight and had to abort my takeoff as the thrust was well down and would never of got me off the ground. We checked the rpm and it was reving at 7900 so the engine is fine. Any ideas guys, cheers. Quote Link to comment Share on other sites More sharing options...
Steve Posted November 5, 2014 Share Posted November 5, 2014 Is the prop on backwards? Quote Link to comment Share on other sites More sharing options...
Guest Posted November 5, 2014 Share Posted November 5, 2014 It may well be the after market prop mate SW Quote Link to comment Share on other sites More sharing options...
AdEves Posted November 5, 2014 Share Posted November 5, 2014 Did you check prop rpm or engine rpm? Quote Link to comment Share on other sites More sharing options...
george1966 Posted November 6, 2014 Author Share Posted November 6, 2014 My friend connected a device to the ht lead. Quote Link to comment Share on other sites More sharing options...
AdEves Posted November 6, 2014 Share Posted November 6, 2014 Could be wrong pulley = not enough prop RPM and/or prop pitched wrong. Worth sending a photo of your pulley/prop to parajet. Quote Link to comment Share on other sites More sharing options...
AdEves Posted November 6, 2014 Share Posted November 6, 2014 Come to think of it I dont think I've ever seen a 2 blade on a compact. Quote Link to comment Share on other sites More sharing options...
pete_b Posted November 7, 2014 Share Posted November 7, 2014 2 blade needs a different pulley as it needs to turn faster. Quote Link to comment Share on other sites More sharing options...
PatPux Posted November 7, 2014 Share Posted November 7, 2014 The Compact runs a 2.6:1 hub driving a 3 blade prop The Macro runs either a 3.2:1 reduction hub driving a 3 blade prop or the 2.6:1 hub driving a 2 blade hub. George has a Macro, now set up with the 2.6:1 hub and a 2 blade prop. So that means he must be under pitched........doesn't it? given he has recorded 7900rpm engine speed , which is around the XT172 specified max. Quote Link to comment Share on other sites More sharing options...
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