work on about 1/4 mile per 1000' in a R22. It might give you a rough estimate but you would have to factor in MAUW, W/V, etc etc. That's what I was taught, but never used the figures in real life. Go out in whatever heli you're using, start at 1500' and auto to 500' recovery. Use ground markers to see how far you get. Even going for a range auto doesn't exactly give you another 1/4 mile. No matter what you fly, I can pretty much guarantee you won't get where you want to be if you have to do it in anger!
