Hi Fanman, my original prop was from Airways where I bought my motor and this was factory fitted by Fly Products. This was destroyed after around 1 year and a replacement purchased from Paul Kilburn. This was a 122cm Power prop which seemed to work fine with no power problems. Three weeks ago I had set up for a foreward launch, I revved up to provide some air movement, stepped back one step ready to run but somehow one line was drawn into the prop pulling most of the left hand lines into and around my prop. Thankfully I was only at tickover but it still threw my back onto the floor, destroying my prop and most of the left hand lines were wound around the reduction wheel causing a slight tear in the belt and lines cut and damaged.
I have had my wing repaired at The Loft, replaced the belt, which seemed to be very tight and overtensioned. I purchased a replacement prop, the same type as before, 122cm power. I fitted this and flew in Wales but had next to no thrust gaining only 400ft above groundat full revs. I then purchased a tiny tach to enable me to accurately measure the revs, 5900rpm at this stage.
I then changed the reduction bearings and tested the revs reaching 7500rpm at cold, I thought my problems had ended. I flew the next day but the power was down when the engine was warm reaching 6500 max in flight. I have cleaned and changed my carb gaskets again with no effect. I tried the engine with no prop ( I know this should not be done but I needed to know if the engine would rev freely) 11500 rpm reached immediately. The engine was tuned when warm and the plug is coffee colour.
Yesterday I tried the same type prop but 115cn and it reached 7500rpm.
I have sent the prop back to Paul along with my original Fly prop which has one edge damaged for him to check and compare the pitch.
If I have left any info you need please let me know and thanks for your help in this matter.
Terry