Which motor mounts are suppose to take all viberation out caused by a 3 blade prop?
Kevin
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motor mounts
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motor mounts
by pa24-250 » Sat Aug 30, 2008 7:30 pm
- pa24-250
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motor mounts
by Don Nelson » Sat Aug 30, 2008 11:34 pm
Which 3-Blade Prop, Kevin?
Don't know what Hartzell does, but McCauley normally supplies 4 new Lord J-3804-41 mounts, or at least they did with the prop supplied for my 250 last year.
Except that they mistakenly supplied one J-3804-42 set, that turns out to have a gel surrounded spacer. Tho at first denied, it seems that a few installations, like mine, had excessive movement on engine startup and/or shut down, allowing the metal mount spacer to bang on the engine mount.
In my case I learned about that from Lord, who eventually supplied me with additional gel spacers when McCauley wouldn't - although McCauley supplied the paperwork necessary for the Field Approval to use those spacers.
Having said all that, I should add that most McCauley 3 blade installations are fine with the softer Lord mounts supplied with the propellor kit.
Hope this helps.
Best, Don
Don't know what Hartzell does, but McCauley normally supplies 4 new Lord J-3804-41 mounts, or at least they did with the prop supplied for my 250 last year.
Except that they mistakenly supplied one J-3804-42 set, that turns out to have a gel surrounded spacer. Tho at first denied, it seems that a few installations, like mine, had excessive movement on engine startup and/or shut down, allowing the metal mount spacer to bang on the engine mount.
In my case I learned about that from Lord, who eventually supplied me with additional gel spacers when McCauley wouldn't - although McCauley supplied the paperwork necessary for the Field Approval to use those spacers.
Having said all that, I should add that most McCauley 3 blade installations are fine with the softer Lord mounts supplied with the propellor kit.
Hope this helps.
Best, Don
-
Don Nelson - ICS member
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- Joined: Mon Nov 10, 2003 5:57 pm
- Location: Burlington, Washington; KBVS
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