"BTIZ" wrote in message
news:39Yee.11385$fI.8996@fed1read05...
same thing happens on floats and a water take off..

Hmmm...I don't do my runup during the takeoff, even on the water. It's
true, I have no brakes and so the runup involves getting the airplane
moving. But once the runup is completed, I reposition myself for takeoff.

I can see that there are situations when doing the runup during the takeoff
would be useful and beneficial, but a water takeoff in a seaplane doesn't
seem to me to be one of them. Why complicate the takeoff unnecessarily?
(In John's example, the complication is necessary, but not so for a water
takeoff)

Pete