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Flying Flea - Help with prop sought
Posted: Tue Mar 03, 2015 9:33 pm
by Le Pou
Construction of my Flying Flea is now complete and I ran the engine today for the first time. See photo. The engine is a Rotax 503 UL DCDI fitted with a 3,06 :1 belt drive reduction. Naively I thought I would be able to use a P Prop (70x45) designed for use with a 3.47 :1 reduction drive but the highest RPM I could get was only 4200! I believe that the correct P Prop size for my reduction drive is 70x38.
The belt reduction drive is the same as that used on the older Quicksilver and on the Minimax, I believe. The six prop bolts lie on a circle of 75mm which is smaller than the usual Rotax gearbox drive. Has anybody perhaps got a 70x38 right hand prop that I could borrow for a trial, or buy?
Thanks,
Roy
Re: Flying Flea - Help with prop sought
Posted: Wed Mar 04, 2015 8:16 am
by nicow
Le Pou wrote:Construction of my Flying Flea is now complete and I ran the engine today for the first time. See photo. The engine is a Rotax 503 UL DCDI fitted with a 3,06 :1 belt drive reduction. Naively I thought I would be able to use a P Prop (70x45) designed for use with a 3.47 :1 reduction drive but the highest RPM I could get was only 4200! I believe that the correct P Prop size for my reduction drive is 70x38.
The belt reduction drive is the same as that used on the older Quicksilver and on the Minimax, I believe. The six prop bolts lie on a circle of 75mm which is smaller than the usual Rotax gearbox drive. Has anybody perhaps got a 70x38 right hand prop that I could borrow for a trial, or buy?
Thanks,
Roy
Wow-that looks very nice!!!
Re: Flying Flea - Help with prop sought
Posted: Wed Mar 04, 2015 10:47 am
by Martinvt
That looks like fun....
What is the cost of building it round about?
Re: Flying Flea - Help with prop sought
Posted: Wed Mar 04, 2015 9:08 pm
by Le Pou
Hi
Thanks for the nice comments!
Costs? It has been 10 years in the making (and I thought I would do it in 2 years!),I tell my wife it costs less than it does to play golf but she says I don't play golf - but then women don't understand logic.
I started off listing the costs but soon dropped the idea - I am no accountant and also I found it too depressing so I just did as they tell you in the AA "One day at a time". So frankly I don't know. Perhaps R60 grand?
Roy
Re: Flying Flea - Help with prop sought
Posted: Fri Mar 06, 2015 9:54 pm
by Le Pou
Hi
I saw Pieter de Necker today. He is going to do some surgery on my prop which should solve the problem. We are very very fortunate to have a guru like Pieter in our community.
Re: Flying Flea - Help with prop sought
Posted: Sat Mar 07, 2015 8:31 pm
by Jean Crous
That is the truth, I tell you
Jean.