llavalle
Well Known Member
I started building the elevators and was wondering something...
The plan show the skin to spar rivets to be AN426AD3-3.5 on top and CS4-4 on botton. I get it, one side uses regular rivets, the other one, blind rivets.
The manual state that you can, if you want, use AS426AD3-3.5 on the bottom size, where a squeezer can reach (using the holes in the leading edge to get to them)
Here's the catch : 426AD3 rivets require a #40 hole + #40 dimple. CS4 rivets require a #30 hole + #30 dimple.
The hole, I can oversize... but not the dimple...
I realized that when I closed up my rudder : on the lower section, 1 of the 4 rivets that join the skin to the rib to the horn was unreachable with my sqeezer. I could not get a buck bar in there. The plan said "CS4-4 optionnal". I oversized the hole and without thinking about the dimple, I installed a CS4 rivet in there. The head is sticking out a bit (not too much).
I can live with that, it's on the lower section of the rudder and it's only 1 rivet on each side... but I don't want to repeat this error on 1-2 rivets around the holes in the elevators.
I also read somewhere that CS4-4 rivets are countersunk to 120deg, not 100deg like the other ones. Should I buy a 100deg countersink bit + dimple?
What would you do?
The plan show the skin to spar rivets to be AN426AD3-3.5 on top and CS4-4 on botton. I get it, one side uses regular rivets, the other one, blind rivets.
The manual state that you can, if you want, use AS426AD3-3.5 on the bottom size, where a squeezer can reach (using the holes in the leading edge to get to them)
Here's the catch : 426AD3 rivets require a #40 hole + #40 dimple. CS4 rivets require a #30 hole + #30 dimple.
The hole, I can oversize... but not the dimple...
I realized that when I closed up my rudder : on the lower section, 1 of the 4 rivets that join the skin to the rib to the horn was unreachable with my sqeezer. I could not get a buck bar in there. The plan said "CS4-4 optionnal". I oversized the hole and without thinking about the dimple, I installed a CS4 rivet in there. The head is sticking out a bit (not too much).
I can live with that, it's on the lower section of the rudder and it's only 1 rivet on each side... but I don't want to repeat this error on 1-2 rivets around the holes in the elevators.
I also read somewhere that CS4-4 rivets are countersunk to 120deg, not 100deg like the other ones. Should I buy a 100deg countersink bit + dimple?
What would you do?