Originally Posted by Alien_Tech
I use no brake and let it spin. A stopped prop has less drag than a spinning one.
Alien Tech is correct here, for all the reasons he has already stated.... mostly the work and energy parts. Though I have spent most of my entire aerospace career in wind tunnel testing, I still don't have "quantitive" numbers to how MUCH more drag a spinning prop is from a stopped one, but I assure you it was easy to see in the data.
I did "SEE" the result flying one of my smallish sport models one day. The model behaved absolutely homesick for the ground when the prop was in "windmill". This prop was rather "large" for the model for exceptional duration under power, but was a lead sled with the power off. One day I put an additional small servo on board to drive a pin into the arc of the spinning prop to stop it (a brake on the ESC was insufficient). The model glide improved subsantially!
it does NOT matter what altitude, size of model or size of prop. The relationship is constant unitl you get into "feathering".