BARRY CHECK 6
Joined: 15 Mar 2011
Posts: 738
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 Posted: Mon Nov 14, 2011 6:43 pm Post subject: RotaxEngines-List Digest: No. of blades vs. prop diameter |
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John:
The rule of thumb for an aluminum prop is 2" per blade.
So, reduce by 2" going from a 2 blade to a 3 blade and another 2" going to a 4 blade.
NOW! The pitch INCREASES 1" above MAX when going from a 2 blade to a 3 blade...
So, if you were at 60" of pitch on a 2 blade you go to a 61" on a three blade and then a 63" on a 4 blade.
The other rule of thumb is: You will loose 50 RPM for every inch of increase pitch and gain 50 RPM for every inch of decrease in diameter.
The ONLY final test is TEST - TEST - TEST.
Barry
On Mon, Nov 14, 2011 at 2:26 PM, John Goodings <goodings(at)yorku.ca (goodings(at)yorku.ca)> wrote:
[quote]--> RotaxEngines-List message posted by: John Goodings <goodings(at)yorku.ca (goodings(at)yorku.ca)>
We are currently using a 68" 3-blade GSC prop on our Zodiac 601HD with R912S. We are happy with it, but the ground clearance is not great for grass strips. I saw a recent reference to a Warp Drive 4-blade prop. If we went to a 4-blade prop, by how much would the prop diameter be reduced?
John & Peter Goodings, C-FGPJ, CH601HD with R912S, Carp/Ottawa/Toronto.
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