Hello Doug,
No pictures yet but I am working on it.
For now, I can provide the following information: the gear box has four spur gears packed inside the aluminum gear box. The "Gaudynski motor" powers the main shaft with the first gear (gear#1). This gear powers the gears #2 and #3 that are positioned in the same plane as gear#1. Gear #3 is thicker and this allows for its engagement with gear #4 that powers a hollow shaft rotating in the opposite direction to the main shaft.
12x6 carbon composite two blade propellers are attached to both shafts.
The gear box ratio was 1:2.4 last year but I know that a new gear box is being developed, with different ratio. This ratio is TBD at this moment.
I still do not know the Kv of the "Gaudynski motor" and the allowable current but I estimated both. Please see below:
12x6 two blade carbon composite propellers must turn within 9,000 - 10,000 RPM range, otherwise the full size (60" wings span and ~64 oz. RTF weight) F2B plane would not maintain the required lap time around 5 seconds on 64-65' long lines.
The "Gaudynski motor", like I wrote before, is the 8 pole in-runner, therefore the RPM of this motor must be in 22,500-23,000 range (9,500x2.4) on 6S battery (the average voltage for 6S is assumed to be 24 Volts). Now...22,500 RPM must be "upgraded" by at least 20% to account for the gear box friction and the electromagnetic losses in the motor. 22,500 / 0.8 =28,125 RPM.
Finally, the Kv of the motor = 28,125 / 24 = 1172.
Please note that this Kv is almost as twice as high as the Kv of the out-runners used by the top F2B fliers using the single prop. configuration.
Happy flying,
M