>So many planes have a figure like '7.5 oz/sq in'
It's the amount of weight each sq.in. of wing area carries, but we measure it
in oz/sq.ft. For example, a wing that's 48" x 10" is 480 sq.in. in area.
Divide by 144 to get sq.ft. That's 3.33 sq.ft. Let's say this plane weighs 4
pounds. That's 64 ounces. Now divide 64 by 3.33. That's 19.2 oz./sq.ft.
That's a respectible loading for a sport plane.
The lighter the loading is, the quicker the plane will respond, and the easier
it will fly. A typical glider has a loading of around 5, sport planes range
from 12-20, warbirds fly with 25-30, and I've seen giant scale planes upwards
of 50-75. Larger planes can carry higher loading due to wing volume, which is
another topic. These numbers are all general and are not "set in stone".
>Is a high wingloading plane easy or hard to fly?
It will fly better in high wind, but not as well as a low load plane. It will
respond slower and will take longer to stop responding or to recover.
Does a high wingloading plane glide well or drop like a rock?
It might not drop like a rock, but it won't glide as well as a low load plane.
If you get the loading too high on a small plane, it WILL drop like a rock.
For example, I built a Littlest Stick, a 18" span designed originally for .020
and single channel. I put a .049 and two channels in it. I didn't use the
***y servos, but Cox (sized between normal servos and the micros. All my mods
effectively doubled the weight of the plane. It flew great, but when the
engine quit, you'd better be within 100 feet or so of the runway, cause it was
coming down, NOW!
Does a high wingloading plane take off easily?
It will require a longer takeoff roll and more speed.
"There's a Hun in the sun!"