sorry didnt obsorbe what you were saying, possibly because ide just got out of bed! i see what you are saying now and do it all the time on my neighbors property when i mow for them.
the only thing is trying to calculate the angle so you can run strait up and down and not miss patches, but that depends on how wide the section is your mowing. no problem on a bit area with a flat rise at the top but if you try and turn sharply on to avoid fences or such its a pain in the ...
sorry i misunderstood what you were saying
regards jay