With the Whirlwind 7 we had to hover by 40" as max power was 44" as it took 4" to fly away. I think our hover height was either 15ft or 20ft which we got off the cable, no doppler, rad alt or other modern aids, the main aid being the Mk 1 eye ball!
The looker had to really be on the ball & we had to fly exactly as he asked.
