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Old 03-13-2020, 08:29 AM
jharkin is offline
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Quote:
Originally Posted by Mark Dennis View Post
Well if the manual says it, it must be true? Who knows their engines better than the manufacturer?

Somebody read the spec sheet for 12.9 bolts and missed the point that you cant use the published steel into steel torque value when threading into aluminum.


Or they didn't read a spec sheet at all and just guessed. Most of these hobby companies don't actually have degreed engineers doing their design work. The community wouldn't tolerate the prices they would have to charge if they did.
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Old 03-13-2020, 09:57 AM
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You should consider following the specifications. Torque is not like Goldilocks, first time was too tight now itís too loose.

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Originally Posted by Xpira View Post
Great! I tightened it to 75in lbs
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Old 03-13-2020, 12:59 PM
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Originally Posted by William_Burkert View Post
You should consider following the specifications. Torque is not like Goldilocks, first time was too tight now itís too loose.
Honestly the real spec should be from the prop manufacturer. They know the compression requirements of their prop. The bolts and engine hub can handle way more torque than the prop can. I would not go over where he is at now. What I believe he needs to do is run the engine on the ground for a short time and let it cool. Recheck torque. Fly briefly and recheck torque. I would personally check the torque at least 5 times before declaring good.
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Old 03-16-2020, 01:49 PM
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I flew the plane and checked the bolts. They were still tight. Thanks for the help guys.
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Old 03-16-2020, 08:12 PM
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Good stuff, Glade to hear its a going well now.
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