The Murphy Builders Site

Posted: **Fri Feb 17, 2012 10:46 pm**

I was wondering why Murphy chose to use the 2 Blade wooden prop versus the MT - 3
blade?

It makes sense to me that the torque from the 3 blade would be much better
distributed therefore putting less stress on the rest of the plane but I am a
beginner and I am willing to listen to the debate.

Thanks

Jim

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Posted: **Fri Feb 17, 2012 10:46 pm**

Since we can't post HTML I can't put it in 4 inch letters for you!

$COST$!!!!!!!!

:>))))
Wayne

----- Original Message -----
From: "Jim Cole" <jcole@rangroup.com>
To: <murphy-rebel@dcsol.com>
Sent: Tuesday, February 11, 2003 1:07 PM
Subject: Re: MK14 Prop

I was wondering why Murphy chose to use the 2 Blade wooden prop versus the

MT - 3

blade?

It makes sense to me that the torque from the 3 blade would be much better
distributed therefore putting less stress on the rest of the plane but I

am a

beginner and I am willing to listen to the debate.

Thanks

Jim

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Posted: **Fri Feb 17, 2012 10:46 pm**

The M14 conversion Murphy did was under a very tight time frame. The 3 blade
MT was weeks out while the 2 blade beaver paddle was cheap and readily
available and it works. Doesn't it ???? I'll let you know in a few months. We
will have our MT out for a try. MT says we won't believe the diff in takeoff,
climb, cruise to the beaver paddle. They claim something near 30% more
thrust.

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Posted: **Fri Feb 17, 2012 10:46 pm**

Most likely, the 2 blade was chosen because it is the least expensive of the
various props that are available. Current prices on the 2 blade are around
$4000-$4500 USD and they are becoming pretty rare. There are several props
to choose from other than the Vperod V-530 2 blade Russian unit. These other
props include the 3 blade MTV9, 3 blade Hoffmann and 3 blade Hartzell. Of
these, I think the MT is the least expensive. They go for under $12k with
spinner and flange adapter. The Hoffman has been slightly more money than
the MT in the past. The Hartzell is a new item and George Coy knows more
about it than I do. I think it has alum blades and requires a different
governor. I don't know how much it costs but I have heard it is more money
than the MT. The, MT and Hoffmann both have wood core composite blades. The
94" diameter 2 blade V-530 prop is capable of producing 1320 pounds of static
thrust on an M14P. The 94" diameter Hoffmann 3 blade make approx 1450lb of
static thrust. The 98.5" diameter 3 blade MT produces 1560lb of static
thrust. A 102" diameter MT 3 blade produces 1640 lb of static thrust. These
are actual measured values mot theoretical. If you wish to have more info on
MT props, feel free to email me privately or call.

Sincerely,

Kevin Kimball, VP Engineering
Jim Kimball Enterprises, Inc.
PO Box 849, 5354 Cemetery Rd.
Zellwood, FL 32798
407-889-3451 phone, 407-889-7168 fax
<A HREF="www.jimkimballenterprises.com">www.jimkimballenterprises.com</A>

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Posted: **Fri Feb 17, 2012 10:46 pm**

Since we can't post HTML I can't put it in 4 inch letters for you!

$COST$!!!!!!!!

:>))))
Wayne

----- Original Message -----

From: "Jim Cole" <jcole@rangroup.com>
To: <murphy-rebel@dcsol.com>
Sent: Tuesday, February 11, 2003 1:07 PM
Subject: Re: MK14 Prop

I was wondering why Murphy chose to use the 2 Blade wooden prop versus

the

MT - 3
blade?

It makes sense to me that the torque from the 3 blade would be much

better

distributed therefore putting less stress on the rest of the plane but I
am a
beginner and I am willing to listen to the debate.

Thanks

Jim

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