Vmc and Ground Effect
Vmc in Ground Effect
Don't go anywhere near it unless you want a short cut to the big hangar in the sky.
To determine your Vmc you progressively reduce IAS at a safe height.until you are unable to maintain control. Every pilot who tries that in ground effect has made his/her last flight unless the crash is survivable.
The mc in Vmc means minimum control for you under particular conditions of asymmetry in a particular aircraft under particular conditions.
Having determined the value of your Vmc and having remembered the conditions under which it was determined you are then pre programmed to be able to better handle an engine failure and to make a decision as to whether you can extract yourself from a marginal situation..
Ground effect may enable you to reach the beach from a little way off shore!
Ground Effect will vary with the following
Wing span and shape
Wing sweep
Fuselage shape
Aircraft configuration
Alpha
Distance above ground
TAS
Wind gusts
Ground/water surface regularity
And some others which I haven't thought of at this time.
A RAAF pilot under instruction in a B707 had 2 engines on one side shut down at about 1500 ft. He went below Vmc.
They didn't make it.