No Blitz, it's slightly different.

When I push the left stick forward, the recoil motor (which has taken the place of the airsoft motor, and shares the same connections) starts to move a cam wheel.
It takes just a few degrees of rotation for the cam wheel to disengage the recoil sledge, thus letting it (and the barrel) be thrown back from the recoil spring (the spring is in tension when the barrel is in resting position). The backwards movement is instantaneous as it should be.
Meanwhile the cam wheel disengages a normally closed micro which is always under voltage, closing it, and starting the return to resting position of the barrel. When the barrel is at rest, the micro is set open and everything stops, ready for a new impulse.

That is the mechanics.

The original Asiatam unit has another (normally open) micro which is closed by the recoil sledge when it move backwards, operating the stock muzzle flash led (red -coloured). I removed this one.

The recoil unit requires to add a (supplied) microswitch also inside the transmitter. This micro is closed by the left stick itself when pushed forward, and is soldered to the 'K' button pins.

That's why when you push the stick:
- recoil motor operates, making the barrel recoil and the stock led lighten
- the micro inside the transmitter adds the 'K' button cannon sound and tank recoil to the process. With the DBC connected, it also operates the IR beam.


I made a slight change to the stock system. I removed the original muzzle flash led and added the white one you supplied, connected to the HL board and operated through the 'K' button.

Therefore, after adding the micro inside the transmitter I will be able to choose between two shooting modes:
- one is the 'push left stick one', which operates the gun recoil and -if the reloading time from a previous shot has elapsed, since I have the DBC- will operate the IR beam, muzzle flash, gun 'boom' sound and tank recoil. If the reloading time has not elapsed, I will just obtain the barrel to recoil, with no additional light or sound effect.
If I did not remove the stock muzzle flash system, I would also obtain the gun to flash (without really shooting the IR beam), which could be misunderstood as a real shoot during battles (and possibly go against Tamiya's battle rules).


- the 2nd operating mode is the 'quick shot': by just pressing the 'K' button I will operate the IR beam, the muzzle flash and the boom sound with full tank recoil, but without any barrel recoil. Could be useful in battles.

I hope to have explained how the system works clearly enough.


Blitz, I have a question, though. If I set the DBC to 'no recoil' I have seen that the muzzle flash led does not light up when I shoot. Is there a way to correct this?