2 vs 3 blade props
Posted: Sat Feb 18, 2012 10:02 am
Barry,
So I've read or been told, the 3 blade has more thrust (perhaps as much
as 20%?) for takeoff. Also a 3 blade should give you a lower tip speed,
meaning lower noise footprint. I would think the 2 blade is more
efficient in cruise.
I'm sure there are some aerodynamicists out there who will set me
straight on the above opinions...
On my Moose with the standard Murphy tailwheel, I have the 3 blade
Hartzell prop. I have slightly over 19" of ground-prop clearance.
Regarding maintenance issues, there might be (probably is) a difference
in the # of hours between recommended blade/prop governor overhaul hours
between the 2 blade and 3 blades, particularly between the composite MT
props and the metal Hartzell's.
Ted
-----Original Message-----
From: mike.davis@dcsol.com [mailto:mike.davis@dcsol.com] On Behalf Of
Barry Haines
Sent: Wednesday, January 19, 2005 11:14 AM
To: rebel-builders@dcsol.com
Subject: Hello from Ohio & a prop question......
Hello everyone! I have been lurking on this list for awhile now and
have
gleaned a great deal of information - am a low time pilot with a strong
interest in building a Moose in the next 18 months or so (finishing a
Master's degree in nursing at the moment). Trying to imagine what it
must
have been like to build an airplane before the internet!!! The
experiences
and advice shared is probably worth more than the price of the kit??? I
look
forward to someday joining the fraternity of builders.....
A question: What are the differences between spinning a 2 blade vs. 3
blade
prop? Ground clearance?, Performance? Noise? Maintenance? (in terms of
the
M14P on a Moose).......
Thanks,
Barry Haines, SRNA
PS. Thanks again to Scott A. for all the info you sent awhile back ; ))
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So I've read or been told, the 3 blade has more thrust (perhaps as much
as 20%?) for takeoff. Also a 3 blade should give you a lower tip speed,
meaning lower noise footprint. I would think the 2 blade is more
efficient in cruise.
I'm sure there are some aerodynamicists out there who will set me
straight on the above opinions...
On my Moose with the standard Murphy tailwheel, I have the 3 blade
Hartzell prop. I have slightly over 19" of ground-prop clearance.
Regarding maintenance issues, there might be (probably is) a difference
in the # of hours between recommended blade/prop governor overhaul hours
between the 2 blade and 3 blades, particularly between the composite MT
props and the metal Hartzell's.
Ted
-----Original Message-----
From: mike.davis@dcsol.com [mailto:mike.davis@dcsol.com] On Behalf Of
Barry Haines
Sent: Wednesday, January 19, 2005 11:14 AM
To: rebel-builders@dcsol.com
Subject: Hello from Ohio & a prop question......
Hello everyone! I have been lurking on this list for awhile now and
have
gleaned a great deal of information - am a low time pilot with a strong
interest in building a Moose in the next 18 months or so (finishing a
Master's degree in nursing at the moment). Trying to imagine what it
must
have been like to build an airplane before the internet!!! The
experiences
and advice shared is probably worth more than the price of the kit??? I
look
forward to someday joining the fraternity of builders.....
A question: What are the differences between spinning a 2 blade vs. 3
blade
prop? Ground clearance?, Performance? Noise? Maintenance? (in terms of
the
M14P on a Moose).......
Thanks,
Barry Haines, SRNA
PS. Thanks again to Scott A. for all the info you sent awhile back ; ))
_________________________________________________________________
Express yourself instantly with MSN Messenger! Download today - it's
FREE!
http://messenger.msn.click-url.com/go/o ... direct/01/
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