6 years on and I’ve taken delivery of a new 135.
Not sure what you mean..
My thoughts are: have the motor direct drive the chain on the end of the pole, no shaft or shaft support bearings. I don't know how light weight a hydraulic drive system would be, but electric could be plenty light, and the wires are flexible if the pole gets bent. Then you just need the poles to be tolerant of more flex, or include some sort of joints that will bend or pop apart instead of breaking. Still, empty poles with wires running through them should be much cheaper to replace than a drive shaft and all. Having a little onboard battery would certainly be lighter than an engine and gas tank, and it could plug into a wearable battery for most of its use. 1kW of continuous power should be easily achievable, even peaking up to 2.4kW quite easily.
Unnecessary, this isn't house wiring. Use high temp insulation, and voltage around 30v or so. 2.4kW peak is not unreasonable, continuous of course would not be as practical, which is why I said 1kW continuous. 14AWG would probably work just fine, maybe 12AWG.
I use the extendable Husky a lot with a 12 inch bar. It's strong enough in the cut and has surprising torque. Big benefit over gas pole saws is that there is no shaft running down the length of the pole. So any occasional bend is just an annoyance for looks and balance but doesn't stop completion of a job. I bag my motors/engines with a soft cooler or something from a 2nd hand store to prevent premature wear.
