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True Turn nuts and jams

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True Turn nuts and jams

Old 01-17-2011, 05:00 AM
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richardgerardi
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Default True Turn nuts and jams

Has anyone ever counterbore a propeller so the jam nut fits. I am using a Saito 91 and it has a short shaft for the spinner the kit came with. The Ture Turn calls for 1/2 inch hole at a depth of 3/8 inches.
Old 01-17-2011, 06:07 PM
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tailskid
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Default RE: True Turn nuts and jams

I would call Tru-Turn and see what they recommend....
Old 01-19-2011, 10:19 AM
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stevenmax50
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Default RE: True Turn nuts and jams

I have a Magnum 91 and my Tru Turn spinner would bottom out before seating against the backplate.  I talked to Tru Turn on the phone and they were very helpful.  Except that the replacement they sent me also bottomed out.  I simply cannot make it fit.  My problem sounds differant from yours tho.  I just gave up and flew without it.
Old 01-19-2011, 02:36 PM
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hy flyr
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Default RE: True Turn nuts and jams

Yep, I had to do that for my Saito 72. Had to drill the prop out a bit so the jam nut I had would fit. Worked just fine.
Old 01-20-2011, 06:59 AM
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richardgerardi
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Default RE: True Turn nuts and jams

Hy Flyr
What did u used to drill the prop? I was instructed to buy a counterbore tool but can't find one and the ones I saw are like 80$.
Old 01-20-2011, 07:55 AM
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Bob Yeager
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Default RE: True Turn nuts and jams

What did u used to drill the prop? I was instructed to buy a counterbore tool but can't find one and the ones I saw are like 80$.
Go to this page and scroll down to prop drills. I have used these with good results!

http://bennettbuilt.com/page9.htm
Old 01-20-2011, 09:04 AM
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richardgerardi
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Default RE: True Turn nuts and jams

Hi Bob
True Turn gave me B&B's number and have been calling for a week but no answer. Any ideas if they are still in business?? Thanks
Old 01-20-2011, 10:24 AM
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Bob Yeager
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Default RE: True Turn nuts and jams

Good Morning Richard:

I have no clue regarding B&B's status, but it doesn't sound good. I purchased my drill bits several years ago. Keep trying, good luck!
Old 01-20-2011, 06:11 PM
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Campy
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Default RE: True Turn nuts and jams

Check Fox products (the engine makers), they have crankshaft extensions. http://www.foxmanufacturing.com/inde...ort=20a&page=3
Old 02-06-2011, 02:47 PM
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d_bodary
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Default RE: True Turn nuts and jams

Good plan on the prop shaft extensions, But i do think a Saito91 is 7mm. Fox does make three different prop reamers including one that goes from 10mm to 12mm which is probably what you need to counterbore with. I never did like the stepped down drill bits have always been paranoid about it catching in the prop and sending it spinning into my hand.
Old 02-06-2011, 02:50 PM
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d_bodary
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Default RE: True Turn nuts and jams

the 12mm counterbore is obviously going to be 1mm to small for what you need but should get you close enough. to just touch up with a 1/2 drill.
Old 02-06-2011, 03:07 PM
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d_bodary
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Default RE: True Turn nuts and jams

The Fox part# for the 10mm and 12mm reamer is 7207 it is 15.95 from Fox. Tower has it also Part# LXNL18 $14.99

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