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I have an older 601 with the stiff legs.
I am getting significant air into the area under the seat and rear fuselage.
I installed a small scoop at the back under the tail and built covers for the gear box.
All the holes under the belly have been scooped with a punch so they draw air out.
There is enough air pressure that makes the stick boot puff up like a balloon.
Any suggestions where all the cold air is coming in?
An sealed rear fuse access hatch? Assuming you have one. I put a thin strip of weather seal around the opening.
Steering rod holes/boots