Rajay wrote:
Hey Rich,
You reminded me - I've always wondered why the props on the P-38 turn outboard. Isn't that backwards from most counter-rotating twin engine installations?
Based on the little bit of multi-engine training that I've had, I thought that the idea was to have both props turning inboard to eliminate the "critical" engine (that the downward blade was more thrust efficient so you want it closest to the fuselage/centerline.) On the P-38, with both props turning outboard, doesn't that make both engines "critical?"
Dave M.
They installed the engines that way after 1st flying it with a normal set up. The airflow over the wing to fus junction created issues when it hit the horizontal. I guess it was better turning outboard rather than inward with the prop.
The improvement came after they installed large fairings that smoother the airflow and then later the electric dive flaps. In the several conversations I had with Tony Levier I don't recall discussing the prop rotation and whether they tried inward direction again after installing the wing to fus fairings.
Rich