I have two APC thin electric props. One is labeled 12 X 6 EP. It has APC C-2 on the hub. The other is labeled 12 X 6 P. It also has APC C-2 on the hub. They look the same. Are they the same?
I use this prop on my E-Cavalier cut down to a 11-1/2 X 6 P. Dose anyone make a 11-1/2 X 6 P in carbon fiber prop? A 3 blade might be an option but I would have to find a new prop adapter and 3 blade P spinner. Probably too expensive for now. So a 2 bladed P is the best answer.
Hi John
APC electric props are listed with an "E" suffix. Electric Pushers carry an "EP" suffix. APC IC engine Pushers carry a "P" suffix. The IC props would also had a different blade shape than the electric props.
Gets even more confusing: APC electric props used to be very thin, and early adopters to electric stunt would use these typically around 8400 RPM. However APC was concerned with the advances in e-Power and as a result they "fattened" up all the electric props- I think that was around summer 2013. This had a major impact on the 12x6E & 12x6EP as the operation RPM climbed from around 8400 to round 9400. I worked with APC to get them to bring out the F2B series which were somewhere between the early thin props and the later thick props. As a result the 12x6EP-F2B is a roughly 8800 RPM prop.
As Motorman said, there is a difference in weight due to thickness, unfortunately I cannot tell you what the 3 weights would be because I do not have examples of the earlier two 12x6 series.
It sounds like you have settled into a prop: I should leave well enough alone,
BUT if I was flying an E-Cav I would try it with a 10x5.8 EP turning 9500 RPM...