[Doug Lewis]

I'm just getting started on dimpling the horizontal stab. When doing parts that will have 3 parts being rivted (hs-708 rib, hs702 spar, hs-801pp skin) should I be machine countersinking the middle part (hs-702 spar) and leaving the rib flat, or dimple all three? The spar is .040 thick.

 

[Mel]

When in boubt, Dimple!

Always dimple when given a choice. For anything thicker than .032", machine countersinking is required for a 3/32" rivet.

 

[David Z]

0.032"

I just measured HS-702 on my RV8 empennage, and it's only 0.032". I dimpled all three because none were thick enough to countersink.

 

[trackdom]

anyone knows the thickness of HS801 PP ?
regards

 

[Doug Lewis]

Looks to be .032 as well.


Finished dimpling one half of the HS today. Can someone confirm that the 6 inboard holes that are marked to be left open for fairing attach points are still dimpled even though they're left open?

 

[Doug Lewis]

Hi Doug
No dimples there. Look on drawing 44 in your manual and it should show K1000-06 nutplates installed. I am building a 7 but the fairing attachment should be similar. Hope this helps.

****..

Hi Arnie, Thanks for the reply. I didn't dimple the ribs, and was trying to avoid dimpling the skin, but counted the holes wrong and left the wrong holes undimpled. .. Stupid question: Can I put two smooth dies in the squeezer and flatten them back out?

 

[Doug Lewis]

Thanks again Arnie.

 

[trackdom]

Thanks again Arnie.

Hi Doug ,
do you mean you won't dimple your HS skin,but rather countersink?
To morrow I dimple the skin of my HS, using a pneumatic squeezer when possible, and C-frames in the other cases . I hope the job will be similar .
regards

 

[Doug Lewis]

No, I've already dimpled the skins and structure.

 

[trackdom]

sorry, I didn't understand the parts you spoke about...