Lynn Hanover wrote:

I was thinking that there is room for the stationary gear teeth inside the
open side of the rotor. Even without cutting the gear teeth down some. If I get
time I will dummy up a set and see if that is the case. The bearing runs to
the end of the gear teeth and you wouldn't want to give up any bearing support.

Lynn E. Hanover

Lynn, Don't bother doing a dummy stackup, I've done it. There is a small "tang"
inside the open side of the rotor that will catch on the gear teeth in certain rotor
positions. I'm guessing that the "tang" is some sort of a rotor position indicator
for machining  and balancing operations. Since I was working with a junk rotor just to do some simple tests I just milled the "tang" off without trying to determine the
amount of interference. As Paul L. pointed out I now have an unbalanced rotor.

Speaking of rotors, a single rotor engine requires that the front balance weight
be rotated 180 degrees and that weight be added to both front and rear weights to get to a balanced assembly. I plan on using a 89-92 na rotor which is 8 oz.
lighter that my '87 rotors in the hope that I can get to a balanced assembly by
removing a small amount ot weight from my '87 balance weights.

Royce Wise is/was working on a single rotor and he planned on replacing the
rear stationary gear with an aluminum bearing support for weight reduction.
Royce did exhibit some parts at a past Sun n Fun but I haven't seen any posts
from him for quite a while so I don't know what his status is.

Fred Osborn