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Old 07-14-2018, 11:41 AM
tyconnell tyconnell is offline
 
Join Date: Jul 2007
Location: Atlanta, GA
Posts: 136
Default Empennage tip cs4-4 hole to #6 screw conversion

Greetings,

RV-9 empennage, fiberglass attach points: Iíve drilled / dimpled the skins for the CS4-4 rivets per the plans. Now Iím rethinking that. I *think* a #6 screw is a slightly larger hole. Is it possible at this point to convert these CS4-4 holes so I can attach the fiberglass tips with screws instead?

Not a big deal if not, Iíll just continue with what I have.
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N997TL reserved
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  #2  
Old 07-14-2018, 12:49 PM
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az_gila az_gila is offline
 
Join Date: Jan 2005
Location: 57AZ - NW Tucson area
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A good printable reference chart here -

https://littlemachineshop.com/images...DrillSizes.pdf

The #6 screw clearance hole is only .019" larger diameter.

Drill the existing holes out with a #27 drill and re-dimple and countersink with the #6 sized tools.
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Old 07-14-2018, 12:53 PM
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sbal0906 sbal0906 is offline
 
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Location: Winnipeg, Canada
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Would you need to use platenuts to screw into?
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Old 07-14-2018, 02:25 PM
Davoakes@att.net Davoakes@att.net is offline
 
Join Date: Dec 2012
Location: Greenfield, IN
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You need something to screw in to. I would use nutplates.
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  #5  
Old 07-17-2018, 03:00 PM
tyconnell tyconnell is offline
 
Join Date: Jul 2007
Location: Atlanta, GA
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Quote:
Originally Posted by az_gila View Post
A good printable reference chart here ...
Thatís a great reference, thanks!

And to answer the other question, yes platenuts.
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Atlanta, GA
EAA Chapter 690
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N997TL reserved
RV-9(A?) empennage in progress
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