funnily enough i have flown an Ultralight that requires a 3 deg or less approach, anything steeper, with power at idle will result in the aircraft accelerating even with full flap. very slippery little bugger, yet in a high lift, STOL aircraft, and keeping with my preference to always be in gliding range, the approach will be in the order of 10 deg or more approach angle at about 45kts and touchdown at 30kts.