Countersink this?

DavidP2020 · #1 11-30-2022, 03:48 PM

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).

Richard Connell · #2 11-30-2022, 04:40 PM

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

DavidP2020 · #3 11-30-2022, 09:07 PM

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

hoz · #4 12-01-2022, 09:23 AM

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)

DavidP2020 · #5 12-01-2022, 01:44 PM

Quote:

Originally Posted by hoz

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. That’s a key detail. Thank you!