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  #1  
Old 11-30-2022, 03:48 PM
DavidP2020 DavidP2020 is offline
 
Join Date: Dec 2020
Location: Howell, MI
Posts: 61
Default Countersink this?

Building an RV-10.

Sec 29-14, step 9 says to “Machine countersink the holes that are common with the F-01069…Fwd Side Skins in the…F-01004K…Center Section Side Plates…”

Some of these holes appear to not get AN426 rivets at any time. Some will get AN470 rivets for wing root fairing supports. Some of the others are for the landing gear mount drill templates.

Would it be accurate to say that none of the highlighted holes in the F-01004K Center Section Side Plate get countersunk?

Related point: Figure 1 on 29-15 does indicate not to dimple the Wing Root Fairing holes, but seems to indicate the remaining highlighted holes do get dimpled (no exception noted).
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David P

RV-10
Kits delivered: Emp Kit (20 Sep 2021), SB Fuse (7 Mar 2022), QB Wings (6 Sep 2022), Finish (6 Dec 2022)
Lycoming Thunderbolt IO-540 ordered
Partnering with BoilermakerMike
Retired U.S. Air Force
Major airline pilot
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Last edited by DavidP2020 : 11-30-2022 at 03:58 PM.
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  #2  
Old 11-30-2022, 04:40 PM
Richard Connell Richard Connell is offline
 
Join Date: Aug 2006
Location: Sydney Australia
Posts: 451
Default

This has changed since I built mine due to the landing gear weldments being redesigned.

Some of those holes get drilled out for the bolts that capture the weldment. They obviously don't get countersunk.

The rest (holding the F-01004T to the skin and F-1004K only - also used to cleco the template) I don't think it really matters. Those rivets aren't seen and could be AN426 or AN470s.

Looking at the drawings, it dosent specify the rivets, it just says rivet the doubler on, leaving the top 3 holes for the fairing open (not countersunk either)

Without knowing how thick the F-0100K is.... I assume its around 0.050 or more from memory but it may not be... Id be inclined to not countersink it for AN426s and use AN470s.
The minimum thickness of the F-0100K for a countersunk AN426AD4 is 0.050

29-21 step 12
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RV7 VH-XRC Sold :-(
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Last edited by Richard Connell : 11-30-2022 at 04:45 PM.
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  #3  
Old 11-30-2022, 09:07 PM
DavidP2020 DavidP2020 is offline
 
Join Date: Dec 2020
Location: Howell, MI
Posts: 61
Default Thanks!

That all makes sense. Just wanted to make sure I wasn't missing something. Thanks Richard!
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David P

RV-10
Kits delivered: Emp Kit (20 Sep 2021), SB Fuse (7 Mar 2022), QB Wings (6 Sep 2022), Finish (6 Dec 2022)
Lycoming Thunderbolt IO-540 ordered
Partnering with BoilermakerMike
Retired U.S. Air Force
Major airline pilot
CFII
2023 VAF Exempt, but donated anyway
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  #4  
Old 12-01-2022, 09:23 AM
hoz hoz is offline
 
Join Date: May 2014
Location: South Africa
Posts: 8
Default

Been there, made that mistake already. Don't countersink or dimple. They get 27xAN470AD4-6 rivets as shown on page 29-21 (step 12, callout on bottom RHS of Figure 2)
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Last edited by hoz : 12-01-2022 at 09:25 AM.
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  #5  
Old 12-01-2022, 01:44 PM
DavidP2020 DavidP2020 is offline
 
Join Date: Dec 2020
Location: Howell, MI
Posts: 61
Default Good catch!

Quote:
Originally Posted by hoz View Post
Been there, made that mistake already. Don't countersink or dimple. They get 27xAN470AD4-6 rivets as shown on page 29-21 (step 12, callout on bottom RHS of Figure 2)
Hoz,

Good eye. Thatís a key detail. Thank you!
__________________
David P

RV-10
Kits delivered: Emp Kit (20 Sep 2021), SB Fuse (7 Mar 2022), QB Wings (6 Sep 2022), Finish (6 Dec 2022)
Lycoming Thunderbolt IO-540 ordered
Partnering with BoilermakerMike
Retired U.S. Air Force
Major airline pilot
CFII
2023 VAF Exempt, but donated anyway
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