Cyma G36 - worth upgrading?

[Adolf Hamster]

I'm not entirely sure how it achieves it anyway since there is no feedback from the gearbox on gear/piston position, I assume it measures current changes as the motor shifts from load to no load?

As 'borg says its a timed system.

Pretty much it's a case of run until theres no trigger signal, then run x milliseconds longer before you stop.

You'll need to dial it in, not sure on the exact programming steps for the perun but effectively you're just incrementing a timer until one of 3 things happens:

1. You're satisfied with the snappyness

2. The motor stalls (possible, although unlikely)

3. You get a double fire (ie the additional time is enough for it to fire a whole extra shot)

For what its worth burst fire modes are functionally identical to just setting a precock timer long enough for fire multiple shots.

This means it will run slightly longer after releasing the trigger in full auto, but its not noticable. What is noticable is that the first round of semi after a burst of auto wont have a consistent timing as the gearbox will be wherever it stopped after you last released the trigger as opposed to the defined point in the cycle from the cutoff lever.

Cycle detection mosfets (ie the opticals that know where the sector gear is) can make sure they're always in the desired precock state but that comes at the cost of extra expense and faff.

That metal disc is to spread the load from the motor height adjustment screw, in the bottom of the cage, to the bottom of the motor. Otherwise the screw could press against the motor shaft instead.

This, you dont want to be removing that little disk unless your motor has a solid closed end cap

 

[Hatchet]

This, you dont want to be removing that little disk unless your motor has a solid closed end cap

Because otherwise the motor shaft spins the grub screw the first time you pull the trigger and it instantly violently adjusts the motor height, jamming it into the gears and seizing everything up.

Apparently. Not that I've ever done this...

 

[Gunboat Diplomat]

Ah of course, don’t know why that didn’t occur to me. Yes I reinstalled the disc, just didn’t realise what it was for. Motor height seems okay but I might try adjusting to take up the slack since the disc wasn’t touching the base. 
 

I read somewhere that the Perun measures drop in current to sense where the motor is in its cycle, so perhaps it uses that alongside trigger + n time for adjustment.