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D-tube connection to fuselage

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rv7charlie

Well-Known Member
Joined
Nov 17, 2014
Messages
1,251
Location
Jackson
The RVs use a 2x2.5x3/16" angle, trimmed to fit into the nose. See the pic of left wing root nose. An .063" doubler goes on the inside of the root rib; the angle goes on the outside, facing the fuselage. A similar angle (aluminum in early kits, steel in later kits) mounts to the fuselage side at an interior bulkhead. The overlap gets a single bolt. In the RV kits, the root nose rib is also the end of the fuel tank. Because crash impact can drive the wing aft, pulling the nose away from the fuselage, one of the tabs gets a horizontal slot instead of a hole. This allows the joint to slide apart instead of ripping the end out of the fuel tank. In normal operation, the bolted joint is loaded only in vertical shear, so a horizontal slotted joint has no effect in normal operation.



Charlie

nose attach.jpg
 

PTAirco

Well-Known Member
Joined
Sep 20, 2003
Messages
3,602
Location
Corona CA
That's one way to do it. Most other designs use a stout root rib and all the loads from the D-box get transferred to that and get picked up by the rear spar root fitting.
 
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