I recently discovered that the hub of a PT carbon fiber prop ( http://www.f3aunlimited.com/pt-model...ic-carbon-prop ) is different enough than a Falcon carbon fiber prop to prevent it from seating properly on the backplate of a Falcon CF spinner ( http://www.f3aunlimited.com/falcon-8...th-cnc-cooling )

The PT hub interferes/rides up on the raised features of the Falcon backplate.

A potential fix was found at a local Home Depot.
By installing a 5/16 x 1 1/4" neoprene washer on the backplate before installing the prop, the interference is no longer present. The neoprene washer is thin enough so there is no need to modify the CF spinner cutouts in any way and allows either a PT or Falcon prop to be used. The 5/16 cutout fits an 8mm motor hub perfectly and as far as I can measure, there is no issue with balance. The neorpene also 'grabs' the back of the prop and the serrations on the spinner backplate so there appears to be no issue with the prop 'slipping'. The 1 1/4" diameter fits the prop hub perfectly without any overlap that might possibly interfere with cooling.

The Home Depot part number is http://www.homedepot.com/p/5-16-in-x...9358/202210309
Model # 89358

Internet # 202210309

Store SKU # 597862

Just make a shim on the metal lathe.....I informed Mike a while back.

I don't have access or experience with metalworking tools, so this was my next best option.

How do you compare the PT carbon prop with a Falcon?

To me for the exact same size they are very similar I couldn't tell the difference but then again I try to adapt versus changing my setup all the time.

I should have specified for same size on the same a/c....

Unfortunately my PT and Falcon props are different sizes/pitches, so a comparison is difficult,
if they were the same, I would use the data from the Mezon ESC (volts, amps, rpm, temp)

I have the the same size 2 falcon and 2 pt same size and pitch...frankly I don't care much about the data (I use Mezon on pretty much everything new) I go with the feel when I fly the plane it self I think it's way more important then data....

I just ground mine down with the dremel. . . less time than driving to the Home Depot . .