wooden prop location

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Lwells
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wooden prop location

Post by Lwells » Tue Feb 10, 2015 10:35 pm

Does it matter what position a wood prop is installed on an engine. Like 10 o'clock position or number one cylinder up and then prop installed at certain position or does it matter. Also , it is an o-320 and I was wondering about the hub bolt torque. I'm thinking around 225 to 275 Ft labs so how close am I.

Lwells
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Re: wooden prop location

Post by Lwells » Tue Feb 10, 2015 10:37 pm

That is suppose to be lbs. Not labs but my computer changed the spelling.lol

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lyc200
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Re: wooden prop location

Post by lyc200 » Wed Feb 11, 2015 4:59 am

It does if u ever have to hand prop it.

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stroked470
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Re: wooden prop location

Post by stroked470 » Wed Feb 11, 2015 8:11 am

100000000% It matters for the exact reason LYC200 said....you have to position the prop right before the impulse mag fires on compression stroke at an angle that you can grab the prop and turn it on a downward pull so in case you ever have a starter failure you can atleast hand prop it and get it started again, this is always on the left side of the boat looking at the rear with the prop position somewhere between center line vertical and about 10oclock ....The ability to hand prop also depends on your rigging and the clearance to hand prop. But with that being said if you never intend to hand prop it, which no one does but shtt happens sometimes and it is required...you can bolt the prop on any way you want and torque to manufactures specs. Even after I torque a wood prop I still track it and make sure the prop is running true, I always clamp a piece of tig filler rod 1/8" from the trailing edge at the tip and spin the prop through, if the opposite blade hits then you need to adjust that side tighter until the prop is true. Usually it is spot on when torqueing but it is always good to check in my opinion.

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Re: wooden prop location

Post by Waggs » Wed Feb 11, 2015 9:04 am

stroked470 wrote:100000000% It matters for the exact reason LYC200 said....you have to position the prop right before the impulse mag fires on compression stroke at an angle that you can grab the prop and turn it on a downward pull so in case you ever have a starter failure you can atleast hand prop it and get it started again, this is always on the left side of the boat looking at the rear with the prop position somewhere between center line vertical and about 10oclock ....The ability to hand prop also depends on your rigging and the clearance to hand prop. But with that being said if you never intend to hand prop it, which no one does but shtt happens sometimes and it is required...you can bolt the prop on any way you want and torque to manufactures specs. Even after I torque a wood prop I still track it and make sure the prop is running true, I always clamp a piece of tig filler rod 1/8" from the trailing edge at the tip and spin the prop through, if the opposite blade hits then you need to adjust that side tighter until the prop is true. Usually it is spot on when torqueing but it is always good to check in my opinion.

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Lwells
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Re: wooden prop location

Post by Lwells » Wed Feb 11, 2015 2:41 pm

Thanks guys but I'm confused on the torque. Prop company showed over 200 lbs. For aircraft unless I read wrong but one fellow says 35lbs. My bolts are 7/16 I believe. So get me straight on this and thanks.

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Re: wooden prop location

Post by mdelaney » Wed Feb 11, 2015 2:56 pm

Yes 35 pounds is correct for a wood prop!

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Re: wooden prop location

Post by Lwells » Wed Feb 11, 2015 6:06 pm

Thank you

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Re: wooden prop location

Post by Packman » Thu Feb 12, 2015 8:28 am

This is where I keep my Wood prop
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Re: wooden prop location

Post by M3 Racing » Thu Feb 12, 2015 7:01 pm

If that's a new prop torque at 15lbs then go to 35 let sit for about 15 min. loosen and do it again, then check torque after your first trip out.
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Southern Style
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Re: wooden prop location

Post by Southern Style » Mon Feb 16, 2015 8:39 pm

Yup, first torque will set in on the wood... X2 as stated above.. torque, set, loosen, and re-torque... And I always set prop so as to be able to hand prop.. Always nice to know you can run home with no battery.. Murphy rides with us ALL !!! Good luck..
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Swamper470
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Re: wooden prop location

Post by Swamper470 » Tue Feb 17, 2015 8:14 am

My prop is a carbon fiber and it only calls for 60 lbs. I would have thought wood was more or could that cause a split?
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Olf Art
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Re: wooden prop location

Post by Olf Art » Tue Feb 17, 2015 7:57 pm

Swamper470 wrote:My prop is a carbon fiber and it only calls for 60 lbs. I would have thought wood was more or could that cause a split?
Wood will crush if over torqued .... your carbon prop won't. It'll take a 'set' the first time.
Always use a crush plate with any prop to distribute the clamping of the prop bolts evenly over the surface of the hub center.
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Re: wooden prop location

Post by Chick » Wed May 13, 2015 2:01 am

It has been years ago, but the best I remember, I torqued my Banks-Maxwell prop at 75 lbs. But, I had a 1/4" aluminum plate between the bolt head and the wood.

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Re: wooden prop location

Post by air-roberts » Wed May 13, 2015 8:33 am

yes put on top dead center then bolt prop with leading edge at1:00
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Deano
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Re: wooden prop location

Post by Deano » Wed May 13, 2015 8:41 am

I would additionally check and re-torque it if need be, after you've put a couple hours on it.
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Olf Art
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Re: wooden prop location

Post by Olf Art » Fri May 15, 2015 4:31 pm

:wink:
Deano wrote:I would additionally check and re-torque it if need be, after you've put a couple hours on it.
Good advice there. Something else you can do, after you've re-torqued? Paint a
'slippage mark' down a flat of each bolt, or safety wire them together in pairs.

The 'old school' rule for hanging a prop is to mount it at 90 deg. to #1 cyl. at TDC.
You can even do that with the blade on a lawnmower ..... it'll run smoother.
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