The pile of parts is growing to a point where I can make a start. I'm trying to build a twin contra rotation prop lightweight launch assist. Some kind of blend of the SunnyMotor and Ali's early experiments. Here's a few pictures of this weekends efforts...
No post here for a while because it's not been going too well
On another thread Wannabeaflyer was having troubles too and made the remark:
"Expensive brick that ticks like a time bomb"
LOL, that's exactly where I was but I didn't put it so eloquently
Turned out that on my setup I'd fried the BEC. There's no BEC on my ESC's so I put a UBEC in (which also made it easy to put my kill switch in here too). But I forgot to check its rating before connecting up a 12s pack. Turns out it has a maximum 20V input so I fried it with 47V. With no power the modded servo box won't produce any signal resulting in the ESC's woebegone "I can't hear any signal" beeping.
I have a new SBEC so today has beena day of soldering and trialling.
And.... I have some success! At least I got one motor turning on a servo tester. But it didn't work with the modified throttle (made as described elwhere in the forum). So I tried soldering the slide potentiometer in the Skalectrix handset directly (via a three core curly cord) into the contacts where the rotary potentiometer was mounted on the servo tester. This works a treat, though I'm going to have to resolver it as the connections are nowhere near strong enough and I want a cable clamp in there too.
The other thing thing I've done is put a kill switch in the power supply to the UBEC. It's fitted with a missile switch cover so it's two actions to turn on, one easy action to turn off. I've mounted it low on the frame where even if I drop the throttle I can still hit the kill easily. See photos.
And lastly. I've come up with a name for my project. I'm just trying to build a simple thing to push my paraglider up to a level where I can fly as if I wasn't wearing it....
Hi Paul Thanks for documenting this , answered my upcoming question nicely Cheers sir , Small Steady Steps and Parapush will be making a name for itself ...Great stuff that man Cheers ( you realise you now have me doing more business with Ebay LOL ) ..
Noticed that a lot of projects don't have like a main breaker switch or fuse in the Battery side of the circuit , is this to do with the Keep it simple method ? I take it that these systems are live once the battery is connected but only the Inhibitor switch in the Ubec stops the ESC working ?
First fire up.... and I manage to drop the waist strap into the lower prop! Destroyed the buckle the prop is unharmed. Couldn't go to full throttle because I didn't trust myself to hold it against the thrust
Great Progress Paul its all small steps but the main thing is your getting there, Nicely done . I'm stalled at the moment progress wise ( ESC issues but still battling on till I have to commit to buying another ESC ) keep at it mate ... and thanks for posting great pictures .
Well after chopping up the waist strap I've spent a few days cable tying netting to the frame. Sloppy job (the entire cage) but it'll give me enough safety to try it with a wing some time over the weekend probably.