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Prop extensions versus prop weight and Acrobatics

 
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endspeed(at)YAHOO.COM
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PostPosted: Thu May 11, 2006 6:02 am    Post subject: Prop extensions versus prop weight and Acrobatics Reply with quote

Hi Bill,

I too will be running a Sam James cowl on my 8A. I
have chosen an ACI prop which is composite for those
unaware of them. With all the back and forth going on
on this board about prop extensions I decided to call
the prop designer about any problems I might encounter
with acro and the engine crankshaft. He told me it
was a non issue because of the lightness of the
composite prop. He actually performed some
engineering and calculated some of the stresses out
for me as we spoke. He said it was not a factor using
the ACI prop which is 17 lbs. lighter than the
Hartzell. He did mention the heavier metal prop could
become problematic with an extension vis a vis acro
but did not run any calculations. The moral of the
story is the guys with light composite props probably
don't have to worry about their prop extensions.

Fly safely,
Bob Sultzbach

--- Bill Anton <bnanton(at)pld.com> wrote:

[quote]
<bnanton(at)pld.com>

I'm close to finishing my RV-8 and have chosen to
install the SJ cowl,
plenum, and wheel pants. I am using the 200hp
Lycoming IO360 A1B6 in
conjunction with the Whirlwind 200RV prop. The first
-8 cowl was received 6
months ago and we've just begun the installation.
The cowl will not work
without a prop extension without extensive
fiberglass work. Will James
directed me to a company called Sabre Manufacturing
that machines a very
beautiful prop extension. In speaking with the
owner, he assures me that
there will be no prop restrictions with the use of
this extension and that
they have never had a problem with this. I have
heard that the heavier
Hartzell CS prop could have some restriction with an
extension. You should
check with Sabre Mfg for their input.

The original cowling would not fit the engine and
Will James is in the
process of redesigning the cowling to fit the RV-8
with the 200hp lyc. He
has changed the design, including materials used, to
create a lighter and
stronger cowling than previously offered. The
plenum with baffling has been
installed and looks great. At this point I can't
answer any of the
questions regarding increased speed etc. I chose
the SJ products because I
like the appearance and wanted something a little
different. Hopefully,
there will be some speed and/or economy benefits.
It will be difficult to
quantify without apple to apple comparisons which
are hard to come by with
all the different ways the RVs are built.

Bill

--


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LessDragProd(at)aol.com
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PostPosted: Thu May 11, 2006 7:17 am    Post subject: Prop extensions versus prop weight and Acrobatics Reply with quote

There is the MT Propeller. It is a bolt on propeller and spinner assembly
that matches the Sam James cowl.
No prop extension required. No aerobatic restrictions.
There is an option of counterweighted blades to protect your engine and
propeller from overspeeding during "zero" G and vertical maneuvers.
It is also less expensive than the AC propeller.

Just make certain that you provide the correct cowl spacing. Van's cowl
installs at about 1 1/2", and the Sam James cowl installs at about 3 7/8".

Regards,
Jim Ayers
Custom Aircraft Propellers
A division of Less Drag Products, Inc. - An MT Propeller distributor
Certified propellers custom designed for the experimental.

In a message dated 05/11/2006 7:05:37 AM Pacific Daylight Time,
endspeed(at)YAHOO.COM writes:


Hi Bill,

I too will be running a Sam James cowl on my 8A. I
have chosen an ACI prop which is composite for those
unaware of them. With all the back and forth going on
on this board about prop extensions I decided to call
the prop designer about any problems I might encounter
with acro and the engine crankshaft. He told me it
was a non issue because of the lightness of the
composite prop. He actually performed some
engineering and calculated some of the stresses out
for me as we spoke. He said it was not a factor using
the ACI prop which is 17 lbs. lighter than the
Hartzell. He did mention the heavier metal prop could
become problematic with an extension vis a vis acro
but did not run any calculations. The moral of the
story is the guys with light composite props probably
don't have to worry about their prop extensions.

Fly safely,
Bob Sultzbach


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Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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Back to top
endspeed(at)yahoo.com
Guest





PostPosted: Thu May 11, 2006 9:13 am    Post subject: Prop extensions versus prop weight and Acrobatics Reply with quote

Good Point about the no prop extension required. My
ACI prop doesn't need an extension either however, to
be honest it is an extended hub. It has to be to work
with the Sam James Cowl. The distance required is a
fixed distance for any Sam James cowl. You can get
there with either a prop extension on a std prop hub
or an extended hub. I hope this clarifies the last
post. Bob

--- LessDragProd(at)aol.com wrote:

Quote:



There is the MT Propeller. It is a bolt on
propeller and spinner assembly
that matches the Sam James cowl.
No prop extension required. No aerobatic
restrictions.
There is an option of counterweighted blades to
protect your engine and
propeller from overspeeding during "zero" G and
vertical maneuvers.
It is also less expensive than the AC propeller.

Just make certain that you provide the correct cowl
spacing. Van's cowl
installs at about 1 1/2", and the Sam James cowl
installs at about 3 7/8".

Regards,
Jim Ayers
Custom Aircraft Propellers
A division of Less Drag Products, Inc. - An MT
Propeller distributor
Certified propellers custom designed for the
experimental.

In a message dated 05/11/2006 7:05:37 AM Pacific
Daylight Time,
endspeed(at)YAHOO.COM writes:



<endspeed(at)yahoo.com>

Hi Bill,

I too will be running a Sam James cowl on my 8A. I
have chosen an ACI prop which is composite for
those
unaware of them. With all the back and forth going
on
on this board about prop extensions I decided to
call
the prop designer about any problems I might
encounter
with acro and the engine crankshaft. He told me it
was a non issue because of the lightness of the
composite prop. He actually performed some
engineering and calculated some of the stresses out
for me as we spoke. He said it was not a factor
using
the ACI prop which is 17 lbs. lighter than the
Hartzell. He did mention the heavier metal prop
could
become problematic with an extension vis a vis acro
but did not run any calculations. The moral of the
story is the guys with light composite props
probably
don't have to worry about their prop extensions.

Fly safely,
Bob Sultzbach









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