---------------------------------------------------------- RV7-List Digest Archive --- Total Messages Posted Sun 01/25/04: 1 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 05:45 PM - Re: Too short rivets ? (Paul Pflimlin) ________________________________ Message 1 _____________________________________ Time: 05:45:42 PM PST US From: "Paul Pflimlin" Subject: Re: RV7-List: Too short rivets ? --> RV7-List message posted by: "Paul Pflimlin" ----- Original Message ----- From: "Kent Sorensen" Subject: RV7-List: Too short rivets ? Sometimes the HS-609 reinf. bar is too tight a fit against the inside curve of the 603 and needs to be rounded/edged to fit perfect. The slightest separation of parts being rivited could cause the rivit to "smush" (tech. term) between the two parts, thus appearing to shorten the rivit. The tightest possible fit is necessary to maintain the airframe integrity and is essentially more important than a slightly short rivit. > --> RV7-List message posted by: Kent Sorensen > > I'm now getting ready to get my work inspected (this is part of the > requirements up here in Canada). All that's left is some work on the > elevators and the HS rear spar, but I've hit an issue with the plans > calling for rivets that are too short. > > The callout for the joining of HS-603 (the rear spars) and HS-609 > (reinforcement bars) say to use AN470AD4-6 here but after setting the > first one it seems that the -6 is quite a bit too short to set > correctly. If set to fulfill the head width requirement it gets too > thin. > > The combined thickness of the 603 spar and the 609 reinforcement bar is > 0.23 inches so the formula would indeed call for a little less than a > -7. > > I'm curious if I'm making a mistake, if I got a thicker stock of > reinforcement bar in my kit, or if this is simply a non-issue and the > -6 is acceptable after all ? This will have to be inspected and > approved so I'm afraid the last choice is not valid.. > > On the VS back spar the callout is also for -6 but there the combined > thickness is just 0.175 inches so the -6 is ok. > > I have come across this problem two other places in the tail and it's > puzzling. > > The other places I found the rivet length to be inadequate was the > 5 rivets in HS center hinge bracket VA-146. The thickness is 0.185 > inches which calls for a -6 but the plans said -5 > > 6 rivets that join the rudder horn, the shim plate,R-904 lower rib, > R-902 spar and the reinforcement place. The plans said AD4-7 but that > was inadequate so I used -8. > > Kent > Ontario, CA. Almost done with tail. QB fuselage and wings on order > >