my 10,240 is right there using the Xoar.
sorry for the edit
see here, Saito tests numbers are with an APC, the Xoar of the same size and pitch pulls more air, therefor if you get close to the same numbers Saito reports you know you got a very good engine,, on my Magnum 180 Fr an APC 17X8 got me 8.800, while the Xoar of the same size got me 8.200,, the Xoar 17X6 "6" got me 8.600. all proving that the wood Xoars pulls more air
Zingers are very light and do unload more that other wood props, I don't know if they flex or not
Jim