I am building an F-14 with two fans and I have a small problem.

I have connected the two fans into the receiver with an Y-cable. When I started them up for the first time one of them is starting a bit after the first one.
I read the instructions in the ESC manual and completed the throttle range settings as described in the manual.

The first start after this range setting both the fans seemed to start at the same time. I throttled down again but then when I for the second time put some throttle it was back to how it was the first time; one is starting before the other, and of course then one is stopping before the other when I throttle all the way back.

I have not yet put the bottom cover on the F-14 and not test flown it but i guess the unsyncrohnized fans would cause a bit yaw tendency even that it is just the difference of one small step on the thottle (Futaba 7C).

Any ideas?

Thank you in advance!

Best regards Knut