I've always tried to build in the perfect line pull weight in my planes. To get the same pull weight at 90 degrees that you get in level flight is the trick. If you have a plane that pulls harder in level flight than at 90 degrees, how would you trim it to attain perfect pull weight balance?

Leadouts go forwards a tad.

Effectively you can't because (for a stunter at least) they develop around 3g in level flight from centrifugal force (let's not argue about centripetal ) but overhead gravity counteracts by 1G (naturally) leaving 2G for line tension. Any other line tension comes from aerodynamics/trim/engine offset/whatever.

Yes, move the leadouts forward. Do it a little at a time, like 1/8 inch. You can get it to where the pull feels similar level and in the overhead 8s, for example.

Running your engine a bit rich allows more lean out at 90 degrees resulting in a power and llifting increase. And, Eric Rule told me one of his propellers would pull the lines better above 45 degrees than the Zinger 10/6 I was using on my Brodak P40/OS Max .35 Stunt plane. He was right.

Originally Posted by downunder

Effectively you can't because (for a stunter at least) they develop around 3g in level flight from centrifugal force (let's not argue about centripetal ) but overhead gravity counteracts by 1G (naturally) leaving 2G for line tension. Any other line tension comes from aerodynamics/trim/engine offset/whatever.

But...
Move the leadouts ahead and the outward yaw angle is decreased- so the speed goes up a bit- you get slightly less tension in level flight, but the extra speed helps in the climb and overhead areas to gain more tension when it is needed there.