Hi,
I did some flying and tach readings today. It was cold -5degrees celsius. Fuel was 20%oil castor/synthetic and 10% nitro.
The same MenzS 18x6 turned 8400rpm today and pulled 18,5LBS on my fishing scale. APC 18x6W turned 8100rpm and pulled 17,5LBS.
I think the lower number for today is because of the colder weather and my high oil fuel gets pretty thick

and slowing things down.
When airborne I could not really tell which was the best prop but give a slight edge to the MensS pulling slightly better. Both these props are very good for hovering "training"[8D]