The razorback option applies to the model 7 SS. It is a 3 inch high dorsal fin extension to the vertical stab reaching forward and tapering to zero height at the rear of the baggage compartment.
According to the supplement in the builder's manual it "does add to the yaw stability of the aircraft."
The option is made from a 5 foot long piece of aluminum tube and a plywood rib. The parts weigh about 7 ounces. The increase in fabric is negligible.
This photo shows the razorback tubing and the plywood support. It is bonded in place with Hysol at the rear. The front end of the tube slips over a weldment and is bonded to a fuselage cross member.
Re: Razor Back Option
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