Hi all,

At the last word championship the German pilots used 3 blades props.
So I asked my friend Mr. Bruno Schiffter from Germany to provide me some details about that 3 blade props.

Here are some quotes from his emails:

"I have spent a lot of time this spring to try all possible types of 3 blade props. It works at the P20 13s fantastic!
The Q 80 P2013s with two blade prop was the right step; the 3 blade prop at this motor is the next step.
Never have had a better (constant power/ speed) F3A motor before!
At the end of my test flights, Delro-Modelltechnik have made a 3 blade 19x11 (weight 107 grams) with wide blades, which works absolutely great."

"The Delro 19x11 3 blade turns 5950 U/min at 75 Ampere; approx. the same amps like the 2 blade 20x10,5.
But in one flight, you need approx. 400-500 mAh more, compared to the 20x10,5 2 blade, because the characteristic of each 3 blade is another ( that what we want!).
But no problem in running time for each good 4500 mAh Lipo. (P 11 approx. 3500 mAh at low wind and 3900 mAh at high wind conditions)
It is like ever. no advantage without disadvantage.
The disadvantage is that you need more amps in flight, so you need a 4500 mAh battery as minimum.
The advantage is a great, very, very constant power!
Also downside; I think, nobody need a contra rotating drive set anymore!
I am sure, you would like it!"

"Please order 19x11 electric special for Hacker Q 80 and you will get the right prop in a light version. (Approx. 110 grams and made for the short shaft of Q 80)"

"The flight character is different to Günters two blade
- Very much braking downside,
- A little less trust at full power (but more then enough for each storm) and
- Much smoother in power again.
- Less speed but more constant
The sound is okay; It's another, higher sound but no fan-sound like other 3 blades I have tested.
Many people say, it sounds great."

"You have to change your throttle curve and then after any flights I am sure, you will be enthusiastic.
I for myself never have had a smoother, better braking and constant power drive set since I fly F3A.
I am at the end of my wishes of drive set."

I tried that prop on my Xigirs and I can approve all the above and I am so happy with it.

http://www.delro.de/modell_info.php?kat_id=5&mod_id=22

Best regards,

Isaac Najary