[f-AA] C85 Tapered Shaft Prop Hub Question
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Sam Burke
Aug 4, 2012, 11:15:32 AM8/4/12
to aer...@westmont.edu, Pat Burke
I need some advise as to how to install and torque the propeller hub for my tapered crank shaft C85. I have been unable to find what the torque should be. I have attached a photo of the hub. Should I lube the tapered section of the crank so it will come off easier when I remove it?
Regards,
Regards,
Sam Burke N6404C 1947 L16A C85-12 7BCM-296 USAF 47-1076
Tom Holmes
Aug 4, 2012, 12:53:21 PM8/4/12
to aer...@westmont.edu
180 - 200 ft lbs.
Tom
From: Sam Burke <samb...@verizon.net>
To: aer...@westmont.edu
Cc: Pat Burke <samb...@verizon.net>
Sent: Saturday, August 4, 2012 11:15 AM
Subject: [f-AA] C85 Tapered Shaft Prop Hub Question
I need some advise as to how to install and torque the propeller hub for my tapered crank shaft C85. I have been unable to find what the torque should be. I have attached a photo of the hub. Should I lube the tapered section of the crank so it will come off easier when I remove it?
Regards,
Regards,
Sam Burke N6404C 1947 L16A C85-12 7BCM-296 USAF 47-1076
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John Rodkey
Aug 4, 2012, 1:07:06 PM8/4/12
to aer...@westmont.edu, Tom Holmes
If you don't have a torque wrench that has an adapter that will fit the hub nut, here's an approach that works.
If you weight 180 pounds, insert a bar that snugly fits the hole in the hub nut that is at least 1 foot long. A large (1/2 inch?) socket extension adapter works for me. Have someone else hold the prop from moving. Hold onto the bar at the 1 foot mark and do a chin-up. Voila! 180 foot pounds!
Move out or in proportionally as your weight requires.--
John (poobah) Rodkey - N9361E 11AC at Goleta
If you weight 180 pounds, insert a bar that snugly fits the hole in the hub nut that is at least 1 foot long. A large (1/2 inch?) socket extension adapter works for me. Have someone else hold the prop from moving. Hold onto the bar at the 1 foot mark and do a chin-up. Voila! 180 foot pounds!
Move out or in proportionally as your weight requires.
John (poobah) Rodkey - N9361E 11AC at Goleta
CaptG...@aol.com
Aug 4, 2012, 1:59:14 PM8/4/12
to aer...@westmont.edu
Torque number are dry.
Cy Galley
Aug 4, 2012, 6:23:40 PM8/4/12
to aer...@westmont.edu
Despite other numbers posted, the Continental manual says to Torque to 200-225 Foot Pounds. Page 28 Section 6-4 under propeller installation.
Cy Galley - Chair, AirVenture Emergency Aircraft Repair
A service project of EAA Chapter 75 since 1963
From: aeronca...@westmont.edu [mailto:aeronca...@westmont.edu] On Behalf Of Sam Burke
Sent: Saturday, August 04, 2012 10:16 AM
To: aer...@westmont.edu
Cc: Pat Burke
Subject: [f-AA] C85 Tapered Shaft Prop Hub Question
I need some advise as to how to install and torque the propeller hub for my tapered crank shaft C85. I have been unable to find what the torque should be. I have attached a photo of the hub. Should I lube the tapered section of the crank so it will come off easier when I remove it?
Tom Holmes
Aug 4, 2012, 7:05:15 PM8/4/12
to aer...@westmont.edu
You are correct of course.
Tom, two tandems, from Tandem
From: Cy Galley <cga...@mchsi.com>
To: aer...@westmont.edu
Sent: Saturday, August 4, 2012 6:23 PM
Subject: Re: [f-AA] C85 Tapered Shaft Prop Hub Question
Sam Burke
Aug 4, 2012, 9:47:33 PM8/4/12
to aer...@westmont.edu, Pat Burke, Lane Tufts
Thanks Friends,
I was able to get a copy of the Club Notes by Krog and Gehring on the subject of the continental tapered shaft hub removal and installation. I used a bolt and a section of pipe that did the job, thanks. I also used anti seize compound on the contact surfaces of the hub and crank shaft. Mission accomplished.
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