Landing on snow-covered grass

That is my experience. Think about the relative velocity of air through
the prop at full RPM. Now think about the relative velocity of the air
through the prop when moving at the 5-10 MPH most recommend before using
full throttle. The difference is virtually nil. If you are going to
pick up gravel, you will pick it up at 10 MPH about as readily as at 0 MPH.

Gotcha.

Rather than peg it to a specific ground speed, I think the procedure
is more along the lines of this:

"Gradually increase throttle and RPM at a rate commensurate with the
increase in ground speed." Using this rule of thumb you might not
hit full throttle till you're 25% of the way down the runway.
(Everything depends on runway *length*, of course...)

Personally, on a loose surface I would not go to full throttle until
I'm rolling a LOT faster than 5 to 10 mph.
--
Jay Honeck
Iowa City, IA
Pathfinder N56993
www.AlexisParkInn.com
"Your Aviation Destination"