German Prop Pitch Lever

[Kurfürst]

Originally Posted by heloguy

-.....he faster the prop adjusted up to the max, which was around .7 degrees per Kurfurt's note. This was simple enough back then, as there's no special pressure sensing, it would just be an increase and decrease in electrical resistance.

Keep well in mind that the French report above is based on an assumption:

"assuming that the speed of the rotation of the electric motor to be 2500 rpm..."

then, IF this is TRUE

"the speed of change of the pitch would be of the order of 0,7 degrees per second"

Keywords: "assuming" "would be" "of the order of".

I presume the assumption by the French simply follows the gear ratios found, ie. IF the e-motor runs at 2500, THEN the prop pitch change will be 0.7 degrees/sec."

HOWEVER the speed of the rotation of the electric motor (VDM Elektrischer Drehzahlregler 9-9518B type) appears to be 5700 /min, and NOT 2500 /min as the French assumed. Ie. a bit more than TWICE as fast.

See: D.Luft. T 3810 VDM Verstellscharuben Geraete Handbuch, page 19, page 29:




Based on the above, assuming about 1,5 degrees/sec for the 109E seems entirely reasonable. After all, that's about what every single source tells us, including Schwarze Mann. And it was so before in the patch..