Propeller Clearance on SR

Scott & Leere' Aldrich · Post by **Scott & Leere' Aldrich** » Fri Feb 17, 2012 9:22 pm

Trying to figure out what the propeller clearance is in the level attitude
of the SR with the M14. I am looking at a larger diameter prop than the two
blade.

The numbers I just got from Murphy are 18 inch clearance in the three point
attitude and 15 inches (they said approximately 15") in the level attitude.

I scratched my head all morning and don't think it is possible to go down
only 3 inches from three point to level? Since I don't have the fuselage
all my numbers where estimates scaled off of a side view and using different
estimated angles between three point and level.

I always come up with a drop from between 10 and 14 inches??

It should be a fairly similar drop with any type of engine, depending on the
difference in distance from center of rotation to the prop.

So, finally to my question: Has any measured the actual difference between
level and three point on a SR (of any engine configuration) so I could do
some comparisons??

Thanks,
Scott Aldrich
SR#174

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Scott & Leere' Aldrich · Post by **Scott & Leere' Aldrich** » Fri Feb 17, 2012 9:22 pm

Disregard question on prop clearance..Just got new numbers from Murphy. 18
in the three point, 12" with the tail up 20 inches and 9" of clearance with
the tail up 30 inches (not sure if that is level or not)

Scott
SR#174

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Wayne G. O'Shea · Post by **Wayne G. O'Shea** » Fri Feb 17, 2012 9:22 pm

Scott, are those numbers with the M14P's 2-blade wooden prop and the new
SR3500 gear legs??? Do you know the length of the M14's prop?

I ask, as I'm now the owner of a partially completed SR, and if I take it to
completion will be most likely installing the M462RF (315HP) that I obtained
with it, along with the V530 metal 2 blade prop that is 106" long (2" less
than 9 feet!). I am curious about sufficient clearance when wheel landing.

Thanks,
Wayne G. O'Shea
www.irishfield.on.ca

----- Original Message -----
From: "Scott & Leere' Aldrich" <flynski@peoplepc.com>
To: <murphy-rebel@dcsol.com>
Sent: Thursday, November 15, 2001 4:59 PM
Subject: RE: Propeller Clearance on SR

Disregard question on prop clearance..Just got new numbers from Murphy.

18

in the three point, 12" with the tail up 20 inches and 9" of clearance

with

the tail up 30 inches (not sure if that is level or not)

Scott
SR#174

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John Worden · Post by **John Worden** » Fri Feb 17, 2012 9:22 pm

Wayne,
This is what I got from Grant a few months ago.

John

At 10:25 AM 9/13/01 -0700, you wrote:

John Hi
The New Radial Super Rebel has a 96" diameter prop on the 3500 gear legs
which are 2" taller than the regular gear legs. The tires presently being
used are 600 X 850 which stand about 22.5" high. We regularly wheel land the
aircraft and no ones hit the prop yet. If your going to use the 2500 gear
legs your probably restricted to 94" prop diameter.
Grant McDaniel
Technical Support
Murphy Aircraft Mfg. LTD.
----- Original Message -----
From: "John Worden" <worden@owt.com>
To: <murtech@murphyair.com>
Sent: Wednesday, September 12, 2001 5:19 PM
Subject: Propeller dia

At 02:19 PM 11/15/01, you wrote:

Scott, are those numbers with the M14P's 2-blade wooden prop and the new
SR3500 gear legs??? Do you know the length of the M14's prop?

I ask, as I'm now the owner of a partially completed SR, and if I take it to
completion will be most likely installing the M462RF (315HP) that I obtained
with it, along with the V530 metal 2 blade prop that is 106" long (2" less
than 9 feet!). I am curious about sufficient clearance when wheel landing.

Thanks,
Wayne G. O'Shea
www.irishfield.on.ca

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Wayne G. O'Shea · Post by **Wayne G. O'Shea** » Fri Feb 17, 2012 9:22 pm

Thanks John!

I thought that the M14's prop was longer than 96", since that is 2" smaller
in diameter than my 3 blade Hartzells on the GSO480 geared engine UTVA 66's
that I have. I think/hope Grant was reminiscing about the 3 blade Hartzell
they had on the O-540, but on the other hand seems a little long for the
direct drive engine. I will do some more digging (or wait for some more
details from the list) as I thought the M14's prop was either 102 or 104".
Considering the prop that I have is 106 1/2" long that would only leave me
3.75 inches of clearance, with the tail up 30 inches, if they based the
clearance numbers on a 96" prop. Hope the numbers are wrong, or I will have
to turn the tread off some truck tires like they did for the Sherpa, because
I very rarely fly off of pavement (wouldn't that be wild and also require a
ladder to get in!)! Not even considering cutting down the prop length, on
those 10" chord blades!

Regards,
Wayne G. O'Shea
www.irishfield.on.ca

----- Original Message -----
From: "John Worden" <worden@owt.com>
To: <murphy-rebel@dcsol.com>
Sent: Thursday, November 15, 2001 7:59 PM
Subject: Re: Propeller Clearance on SR

Wayne,
This is what I got from Grant a few months ago.

John

At 10:25 AM 9/13/01 -0700, you wrote:

John Hi
The New Radial Super Rebel has a 96" diameter prop on the 3500 gear legs
which are 2" taller than the regular gear legs. The tires presently being
used are 600 X 850 which stand about 22.5" high. We regularly wheel land

the

aircraft and no ones hit the prop yet. If your going to use the 2500 gear
legs your probably restricted to 94" prop diameter.
Grant McDaniel
Technical Support
Murphy Aircraft Mfg. LTD.
----- Original Message -----
From: "John Worden" <worden@owt.com>
To: <murtech@murphyair.com>
Sent: Wednesday, September 12, 2001 5:19 PM
Subject: Propeller dia

At 02:19 PM 11/15/01, you wrote:
Scott, are those numbers with the M14P's 2-blade wooden prop and the new

SR3500 gear legs??? Do you know the length of the M14's prop?

I ask, as I'm now the owner of a partially completed SR, and if I take it

to

completion will be most likely installing the M462RF (315HP) that I

obtained

with it, along with the V530 metal 2 blade prop that is 106" long (2"

less

than 9 feet!). I am curious about sufficient clearance when wheel

landing.

Thanks,
Wayne G. O'Shea
www.irishfield.on.ca
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Mike Davis · Post by **Mike Davis** » Fri Feb 17, 2012 9:22 pm

Hi Wayne, according to Murphy's web site, the Hartzell constant speed props
that they sell for the SR are 84" in both 2 and 3 blade configuration. They
also say on their web site that their M-14P is turning a 94" propeller at
1900 RPM. Seems to be some confusion with Grant saying it is 96"... either
way, looks like it's considerably less than your 106".

Mike

----- Original Message -----
From: "Wayne G. O'Shea" <oifa@irishfield.on.ca>
To: <murphy-rebel@dcsol.com>
Sent: Thursday, November 15, 2001 1:19 PM
Subject: Re: Propeller Clearance on SR

Scott, are those numbers with the M14P's 2-blade wooden prop and the new
SR3500 gear legs??? Do you know the length of the M14's prop?

I ask, as I'm now the owner of a partially completed SR, and if I take it

to

completion will be most likely installing the M462RF (315HP) that I

obtained

with it, along with the V530 metal 2 blade prop that is 106" long (2" less
than 9 feet!). I am curious about sufficient clearance when wheel landing.

Thanks,
Wayne G. O'Shea
www.irishfield.on.ca

----- Original Message -----
From: "Scott & Leere' Aldrich" <flynski@peoplepc.com>
To: <murphy-rebel@dcsol.com>
Sent: Thursday, November 15, 2001 4:59 PM
Subject: RE: Propeller Clearance on SR

Disregard question on prop clearance..Just got new numbers from Murphy.
18
in the three point, 12" with the tail up 20 inches and 9" of clearance
with
the tail up 30 inches (not sure if that is level or not)

Scott
SR#174

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Mike Davis · Post by **Mike Davis** » Fri Feb 17, 2012 9:22 pm

Oops, that was supposed to be 2900 RPM! It's right above the picture of the
demonstrator with the fork lift hooked to it's tail, and two folks laying
across it trying to keep it down... looked very windy, and very wet!

Mike

----- Original Message -----
From: "Mike Davis" <mike.davis@dcsol.com>
To: <murphy-rebel@dcsol.com>
Sent: Thursday, November 15, 2001 8:07 PM
Subject: Re: Propeller Clearance on SR

Hi Wayne, according to Murphy's web site, the Hartzell constant speed

props

that they sell for the SR are 84" in both 2 and 3 blade configuration.

They

also say on their web site that their M-14P is turning a 94" propeller at
1900 RPM. Seems to be some confusion with Grant saying it is 96"...

either

way, looks like it's considerably less than your 106".

Mike

----- Original Message -----
From: "Wayne G. O'Shea" <oifa@irishfield.on.ca>
To: <murphy-rebel@dcsol.com>
Sent: Thursday, November 15, 2001 1:19 PM
Subject: Re: Propeller Clearance on SR

Scott, are those numbers with the M14P's 2-blade wooden prop and the new
SR3500 gear legs??? Do you know the length of the M14's prop?

I ask, as I'm now the owner of a partially completed SR, and if I take

it

to
completion will be most likely installing the M462RF (315HP) that I
obtained
with it, along with the V530 metal 2 blade prop that is 106" long (2"

less

than 9 feet!). I am curious about sufficient clearance when wheel

landing.

Thanks,
Wayne G. O'Shea
www.irishfield.on.ca

----- Original Message -----
From: "Scott & Leere' Aldrich" <flynski@peoplepc.com>
To: <murphy-rebel@dcsol.com>
Sent: Thursday, November 15, 2001 4:59 PM
Subject: RE: Propeller Clearance on SR

Disregard question on prop clearance..Just got new numbers from

Murphy.

18
in the three point, 12" with the tail up 20 inches and 9" of clearance
with
the tail up 30 inches (not sure if that is level or not)

Scott
SR#174
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