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Torque ?s

 
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rwill1(at)adelphia.net
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PostPosted: Sun Feb 12, 2006 7:35 am    Post subject: Torque ?s Reply with quote
Group,
Installing spinner on the KF... Have a 3blade wooden GSC prop - I can find the best torque specs for the prop 75-100in lbs - but having a hard time pinning down the Hub Flange torque specs??? Anyone know?

Also, would regular AN4 bolts with Head drilled provide the same strength and purpose than regular "Prop Bolts" ? Believe they are all Grade 8 regardless.. so if right size, does it matter ??

thanks
Richard

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rdmac(at)swbell.net
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PostPosted: Sun Feb 12, 2006 9:48 am    Post subject: Torque ?s Reply with quote
Rich, I believe the instructions say 140 in lbs. on the Hub Flange. However
I used AN5 bolts.
Roger Mac
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dcaofak(at)acsalaska.net
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PostPosted: Mon Feb 13, 2006 9:45 am    Post subject: Torque ?s Reply with quote
Prop bolts have a longer threaded portion than standard AN bolts. When selecting bolts for your propellor make certain that the bolt is not 'bottoming out' on the shoulder where the threads end. It is possible to torque a bolt in this condition to spec, and have little or no compression on the parts being bolted together.
John Stoner
KF III, 582
Alaska

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rwill1(at)adelphia.net
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PostPosted: Mon Feb 13, 2006 3:50 pm    Post subject: Torque ?s Reply with quote
Thank you, I did find this out and because of the "non prop" bolts.. I just used a die nf 1/4-28 and lengthened the tread so it would not bottom out... They are AN4 bolts so I am thinking the torque specs must in the in the 120in lbs range...

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lcfitt(at)sbcglobal.net
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PostPosted: Mon Feb 13, 2006 5:01 pm    Post subject: Torque ?s Reply with quote
Rich,

I suspect you might hear of this from others also, but here goes. Aircraft
bolts have rolled rather than cut threads to reduce the tendency for
thread cutting leaving burs that could result in stress risers and ultimate
stress fracture. I think good advice would be to get the proper prop bolts
and fly with a bit less stress on you.

Lowell

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rwill1(at)adelphia.net
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PostPosted: Fri Feb 24, 2006 12:56 pm    Post subject: Torque ?s Reply with quote
Agreed...thanks

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