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Prop Pitch Tool

 
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n7188u



Joined: 15 Nov 2015
Posts: 395

PostPosted: Thu Sep 09, 2021 12:44 pm    Post subject: Prop Pitch Tool Reply with quote

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

PostPosted: Thu Sep 09, 2021 1:28 pm    Post subject: Prop Pitch Tool Reply with quote

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: 395

PostPosted: Fri Sep 10, 2021 5:38 am    Post subject: Re: Prop Pitch Tool Reply with quote

Darn it. Where is my head these days. Here it is.
Chris


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Prop Angle Tool.pdf
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Fred Klein



Joined: 26 Mar 2012
Posts: 503

PostPosted: Fri Sep 10, 2021 3:51 pm    Post subject: Prop Pitch Tool Reply with quote

thank you Chris

Quote:
On Sep 10, 2021, at 6:38 AM, n7188u <chmgarb(at)gmail.com> wrote:



Darn it. Where is my head these days. Here it is.
Chris




Read this topic online here:

http://forums.matronics.com/viewtopic.php?p=503117#503117











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