Dear Bax,

I have OS 91 FX mounted inverted in an aircraft having severe fuel flow problems. Can you provide a schematic of tank location wrt to needle valve for inverted mounted engines?

Secondly I am using a fuel tank with plastic nozzle on top for air with no tube protuding in the tank. In most of the OS engine manuals the diagram for Fuel tank shows fuel tanks with air tubing protuding into fuel tank bent at 90 degrees. Which one is better for aerobatic flying ? My 91 FX starts to cough when I do Knife edge.

Regrds,

Khizer