jamgrah
Sep 09, 2006, 04:25 AM
I am builiding a GWS Zero. No motor unpainted.
I am adding GWS retracts and Wing Cannons with Cowling machine guns.
I have to keep it light with a small inline brushless and 6 gr servos except for retract.
But the post here is about the armament.
So here is the plan being somewhat EE capable I can build circuits.
The output of a servo port on any reciever is pretty easy to decode and use for gizmos. A pair of timers with either a MOSFET or LED output, the input is hooked to a servo signal and they can be daisy chained.
The pulse to the servo is a transition to voltage ~every 20ms for a few ms.
The longer the pulse stays high the farther the servo travels from min.
So trigger a timer on transition to high, wait the desired ms (cap resistor pair), if the voltage is high after time then pulse trigger the next timer which flashes the LEDs or transistions a coil around a bar (very small) which instead of holding the magent on the bomb it repulses and bomb is away.
The power from the reciever drives the electronics.
I have a 6 channel TX (6EXA), I will use the flaps knob that way 30% will start the guns 70% the bombs. Yes guns blazing when dropping bombs.
One set of timers for guns and cannons a second for bombs one under each wing or a center torpedo / bomb.
A tiny pcb surface mount for a 555 timer package (such as 4-6 timers in one), resistors and caps with large landing pads for solder on LEDs, coils and servo cable. Single sided postage stamp size.
The cannons I will make from CF tube with a plastic cooling sleave. run the wires inside the tube as it enters the LE then run wiresto center mount on top of the wing with the aileron and retract servos.
Same with guns in colwing just smaller.
Bomb drops would be a coil around a bar of piano wire. Neodyns will hold to bomb to the wire fine without power. coil draws power only with active to repulse the magents.
Anyway that is the plan. Total component cost would be low because I buy buld price resistors and caps. The timer chip would be a few$ so all up less than the cost of a servo.
What do folks think so far? As per the title it could be used for areial photo as well.
I am adding GWS retracts and Wing Cannons with Cowling machine guns.
I have to keep it light with a small inline brushless and 6 gr servos except for retract.
But the post here is about the armament.
So here is the plan being somewhat EE capable I can build circuits.
The output of a servo port on any reciever is pretty easy to decode and use for gizmos. A pair of timers with either a MOSFET or LED output, the input is hooked to a servo signal and they can be daisy chained.
The pulse to the servo is a transition to voltage ~every 20ms for a few ms.
The longer the pulse stays high the farther the servo travels from min.
So trigger a timer on transition to high, wait the desired ms (cap resistor pair), if the voltage is high after time then pulse trigger the next timer which flashes the LEDs or transistions a coil around a bar (very small) which instead of holding the magent on the bomb it repulses and bomb is away.
The power from the reciever drives the electronics.
I have a 6 channel TX (6EXA), I will use the flaps knob that way 30% will start the guns 70% the bombs. Yes guns blazing when dropping bombs.
One set of timers for guns and cannons a second for bombs one under each wing or a center torpedo / bomb.
A tiny pcb surface mount for a 555 timer package (such as 4-6 timers in one), resistors and caps with large landing pads for solder on LEDs, coils and servo cable. Single sided postage stamp size.
The cannons I will make from CF tube with a plastic cooling sleave. run the wires inside the tube as it enters the LE then run wiresto center mount on top of the wing with the aileron and retract servos.
Same with guns in colwing just smaller.
Bomb drops would be a coil around a bar of piano wire. Neodyns will hold to bomb to the wire fine without power. coil draws power only with active to repulse the magents.
Anyway that is the plan. Total component cost would be low because I buy buld price resistors and caps. The timer chip would be a few$ so all up less than the cost of a servo.
What do folks think so far? As per the title it could be used for areial photo as well.