Originally Posted by
darnold
AWESOME DATA!!!! Thank you!!! I'm really not surprised at your findings as I've suspected the research methodology and subsequent research approach and validity steps from Sanwa as well. I've read that the 4pX and M12S have the "same" chip somewhere, but that's an unsubstantiated claim. When people say they "feel" more 'connected' it is typically difficult to determine if it's due to latency, resolution, or framerate. If they do have the same 'chip' (CPU ?) then their framerates (clock cycles) are most like the same and locked in.
The 3.3ms from Futaba was for the 4pk-S. Futaba claimed it was UP TO twice as fast as the standard 4pK.
All futaba 4PK 4PKS 4PX etc probably have 303hz update rate on the servos as this is probably the highest rate you can go to with normal servos. So if you get the value 3.3ms in any context just ignore it because it is not the radio delay just the update rate. The update rate can not be faster because you must have at least 2ms to be able to send 2ms signal to the servo. And having 1.3ms resting between each signal to the servo is probably the lowest they dare to go and have servos working as expected and not glitching out.
The 4PX will arrive in my mailbox in 2 days time, stay tuned for results.