Previous builder has riveted the fuselage side skins to the longerons and left holes open for rivets common to top and side skins. However, longerons are not countersunk nor are the side skins dimpled.
Plans call for AD4- rivets. The 0.025 F-425 top skin will have to be dimpled. Countersinking the 0.032 side skins for AD4- (1/8") flush rivets will go well beyond the allowed countersinking for a 0.032 skin.
Manual does say that countersink of skin held between sheets (in this case between dimpled top skin and partly countersunk 1/8" longeron) is OK. So I shouldn't worry and just go ahead and countersink for AD4- flush rivets?
I'm thinking of simply doubling number of rivets and using AD3- instead of AD4-. Would two AD3- rivets be as strong as one AD4- rivet?
Finn
Plans call for AD4- rivets. The 0.025 F-425 top skin will have to be dimpled. Countersinking the 0.032 side skins for AD4- (1/8") flush rivets will go well beyond the allowed countersinking for a 0.032 skin.
Manual does say that countersink of skin held between sheets (in this case between dimpled top skin and partly countersunk 1/8" longeron) is OK. So I shouldn't worry and just go ahead and countersink for AD4- flush rivets?
I'm thinking of simply doubling number of rivets and using AD3- instead of AD4-. Would two AD3- rivets be as strong as one AD4- rivet?
Finn