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jconnell(at)fmwildblue.co
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 Posted: Sun Apr 05, 2009 12:33 pm Post subject: Adjusting Sensenich prop tracking |
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Gentlemen:
I have an RV-9A with and Aero Sport 160 hp O-320 with a Sensenich fixed pitch prop and a 2 1/4 spacer. Today I hung the prop and spacer on the engine and torqued the 7/16ths bolts to 40 ft lbs.
I raised the nose strut and rested it on a block to keep the nose from moving. The top spark plugs were removed.
I set up a heavy camera tripod and attached a probe to touch the aft edge of the prop about 3 inches from the end of the prop. I've rotated the prop a number of times and the deviation between the two blades is .02 inches.
Am I in the ball park on this? I could rotate the spacer 180 degrees to the prop and try again. I could rotate the prop and spacer in relation to the engine. Is it normal to be able to get the tracking closer?
Suggestions are welcome - I need to get this squared away before I proceed too far with the spinner.
Many thanks...
Joe Connell
Stewartville, MN
RV-9A N95JJ
[quote][b]
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brucebell74(at)sbcglobal.
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| Posted: Sun Apr 05, 2009 12:56 pm Post subject: Adjusting Sensenich prop tracking |
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Question! What does it do at the very tip of the prop? Try that! BBB
[quote] ---
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jsflyrv(at)verizon.net
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| Posted: Sun Apr 05, 2009 1:54 pm Post subject: Adjusting Sensenich prop tracking |
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Joe & Jan Connell wrote:
1/16" or less and you are good to go.
| Quote: | I have an RV-9A with and Aero Sport 160 hp O-320 with a Sensenich
fixed pitch prop and a 2 1/4 spacer. Today I hung the prop and spacer
on the engine and torqued the 7/16ths bolts to 40 ft lbs.
I raised the nose strut and rested it on a block to keep the nose from
moving. The top spark plugs were removed.
I set up a heavy camera tripod and attached a probe to touch the aft
edge of the prop about 3 inches from the end of the prop. I've
rotated the prop a number of times and the deviation between the two
blades is .02 inches.
Am I in the ball park on this? I could rotate the spacer 180 degrees
to the prop and try again. I could rotate the prop and spacer in
relation to the engine. Is it normal to be able to get the tracking
closer?
Suggestions are welcome - I need to get this squared away before I
proceed too far with the spinner.
Many thanks...
Joe Connell
Stewartville, MN
RV-9A N95JJ
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Charles Heathco
Joined: 10 Jan 2006
Posts: 201
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| Posted: Mon Apr 06, 2009 6:22 am Post subject: Adjusting Sensenich prop tracking |
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I am not sure, but I think 40ft punds is too much??
[quote][b]
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jfogarty(at)tds.net
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| Posted: Mon Apr 06, 2009 8:05 am Post subject: Adjusting Sensenich prop tracking |
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Joe and Jan, Here is a good guy to check with, Doug Shears, A&P/Vibe Tech, Propbalancing.com, 5 Como Ave., St. Paul, MN. Check him out online. He was at our last MNWing Van's Air Force meeting at Lake Elmo.
Jim
RV9a Building
[quote] ---
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jconnell(at)fmwildblue.co
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| Posted: Tue Apr 07, 2009 7:35 am Post subject: Adjusting Sensenich prop tracking |
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The info I have from Sensenich is:
3/8 inch 23 to 25 lb-ft
7/16 inch 40 to 45 lb-ft
1/2 inch 60 to 65 lb-ft
Source is http://www.sensenich.com/new/70cminst.htm
Joe
Time: 07:22:50 AM PST US
From: "charlie heathco" <cheathco(at)cox.net (cheathco(at)cox.net)>
Subject: Re: RV-List: Adjusting Sensenich prop tracking
I am not sure, but I think 40ft punds is too much??
[quote][b]
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rlundin46(at)yahoo.com
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| Posted: Wed Apr 08, 2009 2:40 am Post subject: Adjusting Sensenich prop tracking |
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I thought the discussion started with torquing the bolts on a wood prop. The table you site is for an aluminum prop.
Rick
--- On Tue, 4/7/09, Joe & Jan Connell <jconnell(at)fmwildblue.com> wrote:
| Quote: | From: Joe & Jan Connell <jconnell(at)fmwildblue.com>
Subject: Re: Adjusting Sensenich prop tracking
To: "RV-List" <rv-list(at)matronics.com>
Date: Tuesday, April 7, 2009, 11:27 AM
The info I have from Sensenich is:
3/8
inch
23 to 25 lb-ft
7/16
inch
40
to 45 lb-ft
1/2
inch
60 to 65 lb-ft
Source is http://www.sensenich.com/new/70cminst.htm
Joe
Time: 07:22:50 AM PST US
From: "charlie heathco" <cheathco(at)cox.net>
Subject: Re:
Adjusting Sensenich prop tracking
I am not sure, but I think 40ft punds
is too much??
|
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jconnell(at)fmwildblue.co
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| Posted: Thu Apr 09, 2009 11:06 am Post subject: Adjusting Sensenich prop tracking |
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Hi Rick,
Sorry for the confusion - I should have stated the Sensenich is aluminum.
Joe
Time: 03:40:45 AM PST US
From: Richard Lundin <[url=]rlundin46(at)yahoo.com[/url]>
Subject: Re: Adjusting Sensenich prop tracking
I thought the discussion started with torquing the bolts on a wood prop. The table
you site is for an aluminum prop.
Rick
[quote][b]
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