Airfoil Firewall Torque 
Plane and Pilot
OCTOBER 3, 2024
Another advantage of the counter-rotating props is the elimination of torque roll. This is the tendency to dig in the left tip float during takeoff while countering engine torque. The airfoil is a Harry Riblett shape, giving modernized flow separation on the leading edge for a soft stall yet with good lift and drag performance.
Vintage Aviation News
MAY 2, 2025
The bulge in the back side of the firewall provides clearance for the oil tank. image via AirCorps Aviation) The flap control torque tube assembly mounts below and behind the cockpit area, as shown here. The lever with the yellow knob operates the flaps, while the upright lever at the top adjusts the carburetor air control.
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