[yock]

I'm having trouble recreating the poster's numbers. I'm sure it's my own ignorance, so I'd appreciate some correction.

radius is 3500m velocity is 82m/s

82^2/3500 ~ 1.92

atan(1.92/9.81) ~ 0.19 or 10 degrees of bank.

Where have I gone wrong?

[htareque]

It looks like you used 3500m as the radius when 3500m is the diameter.

[yock]

Thanks a lot, that's it.