Linkage to the Gasparin G28RV throttle arm
Overview of the arrangment.
The wire is 100mm long and measures 60 Ohms.
Connecting to 1 cell gave 23mA - not enough, 2 cells gave 45mA - not enough.
By piggy-backing on to the o/p of the rx combo (http://www.aeronutz.flyer.co.uk) (missing the ESC for now) gave 88mA at 4.3Volts (the o/p dropped .1V from 4.4 with the extra load - but the actuator still worked fine!). This arrangement was powered by the usual 2*50Ma Ni Cad cells. When powered by one cell although the actuator worked fine the extra load collapsed the 4.4 volt rail - one for Graham or Dr Chris new 1 cell dc-dc converters?
At 80mA the wire is being overdriven - however the spec says this is OK providing we don't leave it there too long!
This lash up nearly works (in one direction only!), a better crank and electrical connections may just do it.
Next is to try the 70Ma Ni Mh cells. At 4.8g for 2 (as opposed to 7.3g) these would neally save enough to add a GWS r/x to a 20g plane - now if we could power it from one cell.......
Wrapping the wire roung drum didn't work!
I think the wire just neatens up and squeezes the drum - pity it would have been compact and robust.
Here is here is attempt 3
This works quite well, wverything is 1mm carbon rod with a 0.5mm linkage quick movie(705K) I think the return spring is wasting power. Next is two wire one to pull one way one the other?
Well here it is!
This will work down to 50mA (70 is better) the quick movie (315K) shown this pushing 2X50Ma cell about 7.4gms - I haven't connected it to the motor yet!
The control algorithm is taken from the servo o/p of the gws receiver using the PCB borrowed from by 4-motor flying thing. Basically increase PWM in one wire withe the other turned off. This is not too useful for a throttle but maybe an elevator???
Developing an algorithm that works for throttle control may be harder - only time will tell...