The Murphy Builders Site

That is a very exciting looking PSRU. Nice and light! I think mine weighs
about 100 pounds. I really like the small depth. Mine makes the cowl look
too long. The offset is pretty small at 7.6 inches. Mine is 9 inches and I
came pretty close to needing a bump on the top of the cowl. The smaller the
offset between the input shaft (coupled to the engine crankshaft) and the
prop shaft the higher the engine will sit assuming you put the prop where
MAM intended it. There is a lot of debate about helical cut gears and spur
gears. I won't pretend to know what's better. I went with a helical gear
PSRU simply because of their common use on turboprops and excellent reports
from other users of the one I went with (Firewall Forward CAM-500).
Turboprops have to reduce from upwards of 40,000 RPM down to usable prop
speeds. For arguments on both sides of the debate have a look at the
following:

http://www.mail-archive.com/lancair.lis ... 09503.html

http://www.epi-eng.com/GBX-SpurGearRel.htm

Now don't get me started on the gears versus belts versus chains debate! :-)

Mike
044SR

-----Original Message-----
From: mike.davis@dcsol.com [mailto:mike.davis@dcsol.com] On Behalf Of
rickhm@comcast.net
Sent: Tuesday, March 20, 2007 8:49 PM
To: rebel-builders@dcsol.com
Subject: [rebel-builders] PSRU for V8

I just did a google search for PSRU and found this web site. Having done
this several times before through the years, I don't recall this one before.
Anyone know anything about this company?

http://www.geareddrives.com/

Rick Muller
SR70



-----------------------------------------------------------------
List archives located at: https://mail.dcsol.com/login
username "rebel" password "builder"
Unsubscribe: rebel-builders-unsubscribe@dcsol.com
List administrator: mike.davis@dcsol.com
-----------------------------------------------------------------






-----------------------------------------------------------------
List archives located at: https://mail.dcsol.com/login
username "rebel" password "builder"
Unsubscribe: rebel-builders-unsubscribe@dcsol.com
List administrator: mike.davis@dcsol.com
-----------------------------------------------------------------

That is a very exciting looking PSRU. Nice and light! I think mine weighs
about 100 pounds. I really like the small depth. Mine makes the cowl look
too long. The offset is pretty small at 7.6 inches. Mine is 9 inches and I

came pretty close to needing a bump on the top of the cowl. The smaller

offset between the input shaft (coupled to the engine crankshaft) and the
prop shaft the higher the engine will sit assuming you put the prop where
MAM intended it. There is a lot of debate about helical cut gears and spur

gears. I won't pretend to know what's better. I went with a helical gear
PSRU simply because of their common use on turboprops and excellent

from other users of the one I went with (Firewall Forward CAM-500).
Turboprops have to reduce from upwards of 40,000 RPM down to usable prop
speeds. For arguments on both sides of the debate have a look at the
following:

http://www.mail-archive.com/lancair.lis ... 09503.html

http://www.epi-eng.com/GBX-SpurGearRel.htm

Now don't get me started on the gears versus belts versus chains debate!

Mike
044SR

-----Original Message-----
From: mike.davis@dcsol.com [mailto:mike.davis@dcsol.com] On Behalf Of
rickhm@comcast.net
Sent: Tuesday, March 20, 2007 8:49 PM
To: rebel-builders@dcsol.com
Subject: [rebel-builders] PSRU for V8

I just did a google search for PSRU and found this web site. Having done
this several times before through the years, I don't recall this one

Anyone know anything about this company?

http://www.geareddrives.com/

Rick Muller
SR70



-----------------------------------------------------------------
List archives located at: https://mail.dcsol.com/login
username "rebel" password "builder"
Unsubscribe: rebel-builders-unsubscribe@dcsol.com
List administrator: mike.davis@dcsol.com
-----------------------------------------------------------------






-----------------------------------------------------------------
List archives located at: https://mail.dcsol.com/login
username "rebel" password "builder"
Unsubscribe: rebel-builders-unsubscribe@dcsol.com
List administrator: mike.davis@dcsol.com
-----------------------------------------------------------------