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n7188u
Joined: 15 Nov 2015
Posts: 404
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 Posted: Thu Sep 09, 2021 12:44 pm Post subject: Prop Pitch Tool |
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Someone asked for more info on the pitch tool I made which I then retrofitted with a laser pointer. I am enclosing a pdf here with a template for making it.
Can't take credit since the tool itself I patterned from a friend who bought a new prop and the tool came with it (Whirlwind). But it's just a simple plywood tool with grooves to hold on the the LE and TE of the prop. I just glued a laser pointer I had laying around.
I tested the tool by rotating it around and rechecking the spot position on the ground multiple times and it is very repeatable. But you should check by noting the position of the spot on all blades a few times after you set the pitch. I only chocked the airplane and did the adjustment. Of course, removing the plugs would help but I didn't find it necessary, I just spin the prop slowly and carefully. Don't forget to put some wood blocks under the outriggers if you have a mono like me.
Last, don't forget to ensure the blades are at the same level position when you test (I use a digital protractor) and the tool is at the same place radially. But I didn't go overboard (except making sure blades are at the same position with the protractor when you swap them.
I hope it helps.
Chris
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Fred Klein
Joined: 26 Mar 2012
Posts: 503
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| Posted: Thu Sep 09, 2021 1:28 pm Post subject: Prop Pitch Tool |
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t’was me Chris…thank you for this additional info…alas, I do not find the pdf you referenced.
Fred
A194
| Quote: | On Sep 9, 2021, at 1:44 PM, n7188u <chmgarb(at)gmail.com> wrote:
Someone asked for more info on the pitch tool I made which I then retrofitted with a laser pointer. I am enclosing a pdf here with a template for making it.
Can't take credit since the tool itself I patterned from a friend who bought a new prop and the tool came with it (Whirlwind). But it's just a simple plywood tool with grooves to hold on the the LE and TE of the prop. I just glued a laser pointer I had laying around.
I tested the tool by rotating it around and rechecking the spot position on the ground multiple times and it is very repeatable. But you should check by noting the position of the spot on all blades a few times after you set the pitch. I only chocked the airplane and did the adjustment. Of course, removing the plugs would help but I didn't find it necessary, I just spin the prop slowly and carefully. Don't forget to put some wood blocks under the outriggers if you have a mono like me.
Last, don't forget to ensure the blades are at the same level position when you test (I use a digital protractor) and the tool is at the same place radially. But I didn't go overboard (except making sure blades are at the same position with the protractor when you swap them.
I hope it helps.
Chris
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http://forums.matronics.com/viewtopic.php?p=503110#503110
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n7188u
Joined: 15 Nov 2015
Posts: 404
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| Posted: Fri Sep 10, 2021 5:38 am Post subject: Re: Prop Pitch Tool |
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Darn it. Where is my head these days. Here it is.
Chris
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Prop Angle Tool.pdf |
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305.72 KB |
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Fred Klein
Joined: 26 Mar 2012
Posts: 503
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| Posted: Fri Sep 10, 2021 3:51 pm Post subject: Prop Pitch Tool |
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thank you Chris
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