harley1 Posted September 2, 2007 Share Posted September 2, 2007 Having used graupner props for many years i was interested to find out what the new g sonic's were like and i have to say not only have i found them to be quiet but fairly robust.However i recently bought a batch for my os 55ax,12 x 8 and some 13 x 6 however i found that the centre hole is far to big.I double checked against my irvine 53 and yes there about 2mm to big, so i contacted the supplier only to be told that i should use some fuel tubing to get over the issue.Surely i shoudn't have to in my terms bodge them to fit you don't have to with apc's,you use a prop reamer.Has anyone else had the same experience or is there a source for prop spacers. Quote Link to comment Share on other sites More sharing options...
harley1 Posted September 2, 2007 Author Share Posted September 2, 2007 I did try fuel tubing,not a good idea in my book.carbon rod is an idea,but why have i got to buy a lenght of carbon rod with a 6mm id because they dont fit. but what i cant understand is a prop manufacture like graupner making props to big, that don't fit something as basic as a 46-53 size motor. Quote Link to comment Share on other sites More sharing options...
Andy Gates Posted November 30, 2007 Share Posted November 30, 2007 Speak to an electric flying buddy, and ask if you can have some of the inserts that come with APC E props. They come as a tree of 6 and one will fit the hub of your prop. All you then do is ream out the inset to match your engine shaft Quote Link to comment Share on other sites More sharing options...
Evan Pimm Posted December 2, 2007 Share Posted December 2, 2007 I would have thought that a 12x8 prop would be far too big a load for a .55 anyway. Surely an 11x7 or 11x8 would be far more appropriate.Evan. Quote Link to comment Share on other sites More sharing options...
Tim Mackey Posted December 2, 2007 Share Posted December 2, 2007 In my experience, the old grey graupner props were noisy and inefficient compared to the razor like APC. A quick and very light flash over the edge with a bit of emery paper though and they are fine. Quote Link to comment Share on other sites More sharing options...
harley1 Posted December 3, 2007 Author Share Posted December 3, 2007 evan,os suggest 12x8-13x6,however ive been useing a 12x8 for a couple of months and in all honesty it pulls my wot 4 round the sky far better than my irvine 53 which it replaced.considering the os55ax only cost £76 its a bargain in my book.along the prop spacers route,motors & rotors who supplied the g sonics took my grip on board and supplied the spacers free of charge which secured my continueing support to them.timbo,i note your comment about the old grey graupner props but you ought to try the new g sonics i prefer them to apc's now. Quote Link to comment Share on other sites More sharing options...
Tim Mackey Posted December 4, 2007 Share Posted December 4, 2007 Ok I will do on my next IC model -if there ever is one Quote Link to comment Share on other sites More sharing options...
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