posted 02-10- 11:59 AM               

0,50.5 190,47.3 190,34.3 180,26.5 170,21.5 110,17.8 40,16.3

If I understand this properly, the first number in each pair is the incremental distance out from the prop hub. The second number is the "chord length" of the blade at that point. There are two methods to modify this:

The "real" way: work your way out from the hub, and increase/decrease the chord length to reshape the prop. Start by doubling the chord length of the innermost point or two, and test the climb rate and top speeds high and low. If not enough change was noted, move to the next point out and repeat. If too much change is noted, decrease the amount you changed the last point and "home in" on the right value. Be sure to test speed as well as climb rate.

The "virtual" way: do the same thing, but modify the FIRST number instead (the "prop station" number). This creates "longer" sections of the same chord length. Again, work from the inside out, where the chord is thickest. Make the first section twice as long as it was before, and test. Not enough? Move to the next section. Too much, go back and decrease the amount you changed it.

IMO it's best to use either this method OR Tail's method and get as close as you can with ONE method, then switch to the other method if the first one doesn't quite get you there. Messing with the propElements at the same time you are fiddling with blade pitch and prop diameter is a good way to get a headache...