Hi everyone,
I have a quick question about my RV-7 elevator, but I'm sure it applies to other types so I have put this post in the General section. No success using google to find the answer, so please forgive me if this topic has already been covered.
There is a single hole on each side of each elevator where there are 4 layers fastened together with a flush AD3-4.5 rivet. It is where the skin is on top, the counterbalance skin is next, then the spar and finally a little tab from the counterbalance rib (E-704 on the 7). Obviously the 2 skins should be dimpled; my question is whether to dimple the spar and the rib, or countersink the spar and avoid dimpling the rib. The manual implies that both are permissible but seems to suggest a preference for countersinking the middle layer when 3 or more layers come together. However given that some of my countersunk holes so far have been of dubious quality I would prefer to dimple everything. Also I have read that over time, countersunk holes are more prone to smoking rivets than dimpled ones.
What are the pros and cons? Thanks for any help.
I have a quick question about my RV-7 elevator, but I'm sure it applies to other types so I have put this post in the General section. No success using google to find the answer, so please forgive me if this topic has already been covered.
There is a single hole on each side of each elevator where there are 4 layers fastened together with a flush AD3-4.5 rivet. It is where the skin is on top, the counterbalance skin is next, then the spar and finally a little tab from the counterbalance rib (E-704 on the 7). Obviously the 2 skins should be dimpled; my question is whether to dimple the spar and the rib, or countersink the spar and avoid dimpling the rib. The manual implies that both are permissible but seems to suggest a preference for countersinking the middle layer when 3 or more layers come together. However given that some of my countersunk holes so far have been of dubious quality I would prefer to dimple everything. Also I have read that over time, countersunk holes are more prone to smoking rivets than dimpled ones.
What are the pros and cons? Thanks for any help.