Right on maxxdude, I'm not sure why I didn't see those graphs before (my german's not so good, actually really bad :o )
I'm not sure what the differences of the following are:
TIMING 15ø
STERN TIMING 15ø
TIMING 15ø STERNSCHALTUNG
"STERN"-GESCHALTET TIMING 15ø
So I took a look at the STERN TIMING 15ø for the 2240/10.
http://www.lehner-motoren.de/motordia.php
http://www.lehner-motoren.de/diagram...22s_grafik.gif
http://www.lehner-motoren.de/diagram...26s_grafik.gif
http://www.lehner-motoren.de/diagram...33s_grafik.gif
Correct me if I'm wrong, but those graphs for the 2240/10 show that both 26volts and 33volts are higher efficiency with lower current versus running on the lower 22volts.