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  #11  
Old 10-10-2019, 09:51 AM
Ralph Inkster Ralph Inkster is offline
 
Join Date: Feb 2008
Location: Calgary, Alberta
Posts: 556
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That post was so long ago, I couldn't remember my reasoning...
I've r&r'd probably 8 props for overhaul & Murphy with out fail positions the 6 spinner holes just that bit out of phase, close enough that I wouldn't be able to drill new holes & install nutplates in the bulkhead My solution as described is to reposition the front bulkhead so I have lots of virgin flange to drill new holes & nutplates.
As for elongating the 4 center mount holes, I've seen the damage from cracked spinner bulkheads... cost a set of blades on one plane.
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  #12  
Old 10-10-2019, 12:18 PM
von_flyer von_flyer is offline
 
Join Date: Oct 2014
Location: Metamora, Michigan
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Just went through this a couple months ago when I had the prop seals replaced and blades refinished. They stated the clocking of the front threaded holes may be different since they tighten the 'nut' to a torque and not a position. They showed me a Mooney front plate that has a large amount of rotation allowed by slotting the holes. I assume they have the plate in a mill with a rotating table to assure the slots are concentric to the center point. I had to slot mine perhaps 1/16".
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  #13  
Old 10-10-2019, 01:42 PM
cajunwings cajunwings is offline
 
Join Date: Jun 2007
Location: new iberia la
Posts: 655
Default Slotted bolt holes

Was very common for production planes to have a slotted front bulkhead. On the assembly line it could be rotated as needed to align and if you bought one as a replacement part you could just bolt it on.

Don Broussard
RV9 Rebuild in Progress
57 Pacer
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  #14  
Old 10-16-2019, 07:25 AM
propjoe propjoe is offline
 
Join Date: Mar 2019
Location: Rolling Meadows
Posts: 16
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Quote:
Originally Posted by cajunwings View Post
Was very common for production planes to have a slotted front bulkhead. On the assembly line it could be rotated as needed to align and if you bought one as a replacement part you could just bolt it on.

Don Broussard
RV9 Rebuild in Progress
57 Pacer
Yup, The older Mooney and Arrow propellers have the slotted front support. I work in a prop shop and we always tag that front support when we send them back.
"Align, Tighten and Safety bolts".

Last edited by propjoe : 10-16-2019 at 07:26 AM. Reason: Spelling
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  #15  
Old 10-16-2019, 08:46 AM
sf3543 sf3543 is offline
 
Join Date: Jan 2005
Location: San Antonio, TX
Posts: 970
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Just had this problem last week changing a prop on an RV6A where the holes where off by an inch or so.
Like Paul, all I did was:
-Install the spinner with both bulkheads on the prop and screw in the rear bulkhead screws
-Marked the front bulkhead holes through the existing spinner screw holes with a scribe
-Removed the spinner and front bulkhead
-Drilled out the nut-plates in the front bulkhead and reinstalled them after drilling through the marked locations
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