hi Kevin,
after looking to the shipping costs from your shop to Spain I've thinking in alternatives... and stepping back to my initial idea of maintain this project on the low, I've thought in one possible solution to the elevation problem, but i need advice from you the electronically talented guys 
Without taking into account the use of recoiling, if possible at all, I would like to know what you think about my idea, if it’s feasible or do you have any other way to do it… so:
- imagine a turret less HL PzIV, with the Wirbelwind one installed and with the flakvierling inside
- imagine that no servos would be used for elevation of the guns or rotating the turret, only engines.
- the turret rotation would be the same as any other HL
The standard HL ‘8 wires’ group of cables going from the RX18 to the upper hull is distributed in this way:
pin 1 (black) - negative turret rotation (3.8V - 4.0V)
pin 2 (red) + positive turret rotation
pin 3 (blue) - negative motor gun fire recoil airsoft (4V)
pin 4 (yellow) - negative motor gun elevation (7.2V)
pin 5 (brown) + positive common to elevation and gun engines
pin 6 (green) + positive common to light and MG shooting
pin 7 (white) - negative light
pin 8 (orange) - negative MG shooting
so then:
- there would be no tank gun or recoil or fire system, then the pin 3 (blue) would be free
- it would be possible to use the pins 6 and 8 for MG shooting to fire the flakvierling LEDs with the K button
- on the remote, stick down controls the tank gun elevation, but on a cyclic way, the engine always runs in the same direction (no polariity reverse)
- on the remote, stick up controls the tank gun firing
Well, have I said any incorrect?
Now, the possible solution to have elevation and depression of the flakvierling , up or down, without the cyclic thing, and is here where I need your thoughts and advice!
Could be possible, to use the ‘liberated’ pin 3 (blue) (remember, no tank gun to be fired) to make the elevation engine to turn in the opposite way?
With some electronic component? A polarity inverter? A relay? An H bridge?...?
If this i just said could be doable, then the guns could be fired with the remote’s K button, the remote’s sticks down and up to control the flak elevation…
What do you think? Do you have any other idea to achieve what I want?
Best regards and thank you very much!
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