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HBaker
Joined: 16 Nov 2008
Posts: 119
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 Posted: Sun Nov 16, 2008 1:47 pm Post subject: Murphy Moose Prop |
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I have no knowledge of the available propellers for a Murphy Moose with an M-14 engine. Some of the questions I have are: 1. Is there a 2-bladed aluminum prop available with Western fittings? 2. How does the performance compare between 2 & 3 blades on floats? 3. What is the clearance between the cowling and the propeller flange?
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Currently building a Murphy Moose - any help would be appreciated. |
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george(at)gesoco.com
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| Posted: Mon Nov 17, 2008 4:54 am Post subject: Murphy Moose Prop |
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The propeller options are as follows:
1. Russian two blade composite V-530 Not in Production but available
overhauled and some new old stock. Prices about $5,000 for a good overhauled
prop. Replacement modern blades are also available for the hubs.
2. MTV-9 German three blade composite prop. In production with several
variations including reversing. Price in the range of $15,000 to $20,000
depending on options.
3. Hartzell aluminum prop. Price around $12,000. Requires different
governor. Governor price ranges between $1400 and $2200. Spinner is
additional $1500. Total price around $15,000.
I personally did the flight testing for certification by Hartzell for the
Hartzell propeller. They needed to be sure it was suitable for M14P engine.
There are one or two other composite props that are available, but not in
much use. They have not been proven in my estimation.
There is no two blade aluminum prop that has been tested for the M14P
engine. Remember that the relatively low RPM of the engine at full power
(1950 RPM at the prop) requires a rather long bade to absorb the torque and
translate it to thrust. At 60% power, the prop is only turning at 1170 RPM!
The 3 blade propeller will give about 15% more thrust than a two blade prop
with all other things being equal. It is a decided advantage on floats.
The cowling clearance depends on the cowling. I think on Moose aircraft it
is about 6 inches.
George Coy
Coy Aircraft Sales
714 Airport Rd.
Swanton VT 05488
802-868-5633 off
802-363-5782 cell
george.coy(at)gmail.com
SKYPE george.coy
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