Some of this is reported in the 11x5.5 Pusher thread, but I thought it could stand its own thread - it nees the visibility.

I have been working with APC on the new electric props, and have learned that APC is also redesigning all of their existing thin electric props.  In general they are taking the electric props and thickening up the hub roughly .070" - .12", then blending that added thickness into the blades.  The new props are stiffer and (according to APC & others) the stiffer props use less power.

There is no physical marking to distinguish the new versus the prior design props.  If you have examples in hand you can easilly see the differences, the new props are thicker, most noticably at the hub.

We can also expect that there will be some difference in performance with the new props.  Thus if you set up with the old, then change to the new, your settings will probably have to change too

* If you order props direct from APC you should be getting the updated design, however the older product is still out there.
* If you REALLY do not want to change you might want to start buying all of the old you can find...
*

Exactly right,I went to get a handfull of props like you to do some cutting etc,Made a delete on my cart real quick.By the way how are you people pitching ,(as in pitch gauge )your pusher props.Thanks.   Noel.

Warren/Noel
 Try this site from the UK  http://www.electricwingman.com
I bought three, 13x 4.5 EP APC's from them, postage cost was OK.
Paul Allen

Thanks Paul, Will have to keep an eye out with them.Temporary out of stock!!!,must be popular for something. Regards Noel.