I've decided to throw my hat in the featherweight ring, and was wondering if anyone could recommend a good ESC? The plan is to just build a simple two wheel wedge.
I plan on running E30-400 motors.
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I've decided to throw my hat in the featherweight ring, and was wondering if anyone could recommend a good ESC? The plan is to just build a simple two wheel wedge.
I plan on running E30-400 motors.
There is the featherTwo by Shakey, but there are programmable ones including hobbywing escs and the good ol TZ85A. Sadly the TZs are discontinued.
Hi all, I am also starting my first build Featherweight, can anyone recommend drive motor size please? Looking at two axles with one motor to each. Also what sort of min speed should I be considering for the robot in the arena?
Many thanks
Drill motors are a good place to start since they come with the gearbox already attached. There are alternatives, such as the Gimson 13.7:1 motors I use in The Honey Badger robots, which are based around the "775" motors, gives decent speed and power for the size.
Would these batteries work?
https://hobbyking.com/en_us/zippy-co...pack-xt90.html
I'm building a simple wedge and would also like to know if these are ok, would one do it or should I run two or more?
yes but if you are running drill motors about half that capacity would do you fine
My plan is to run Ampflow E30-400's.Quote:
Originally Posted by shakesc
Those are way too big for a FW
for drive they are pushing it for brushed motors, for weapon there is no such thing XDQuote:
Originally Posted by Anttazz
assuming your wanting to run these motors for drive - 2 axles, then thats 5.4kg with just the motors not to mention gearboxes :)
Hi, found some 24v 30w DC motors, would these be competitive enough for a FW drive (one to each axle - 2no. axles)?
potentially, but what is their weight and you will also need to consider the gearing.
The google search i did shows they are a bit larger than normal drive motors, but this is not specifically your 24v 30w motors :)
They run at stated '24v @ 6000rpm full speed', I was going to run them on 12v (3000rpm potential) with direct drive to the wheel (130mm dia). The acceleration can be set on the handset. If it comes to it I have room for a gearbox. Going for 24v so I can upgrade later if I feel it necessary :lol:
Any thoughts???
I would seriously recommend a gearbox (even a simple single stage reduction) to make the machine more drivable - typically planetary gearboxes are used in the FW class. Have a read through the build diaries here to see what folks are using.
Thanks Michael, what output shaft speed would you recommend? There are some 75w 12v & 24v motors with reduction gearboxes, giving very high torque, but the output shaft rpm is only 470. Feels a little slow, again any thoughts?
That is a little low but can be compensated for with slightly bigger wheels. The Honey Badger 3 ran both 4S (13.2v nominal) and 6S (19.8v nominal) LiFe batteries at Grantham and both were suitably nippy (4S was more controllable on the floor though ;) ).
The motors I use come up to about 1000rpm with no load on 4S and is definitely on the fast end of what FW's have but 470rpm output on 4 or 5 inch wheels should be perfectly respectable.
I agree, 470 rpm on 130mm dia wheels should only give a theoretical speed of 11.3km/hr. I'm guessing I should be aiming for around 15 to 20km/hr. Remembering of course traction has to be gained at the point of acceleration. Shall look for reduction gearbox.... :?
Are any of the propderives from hobbyking worth looking into? What would be a good suitable ESC for it?
Yes, propdrives can be a good motor for a feather, and we have decent results with a SimonK flashed Turnigy TZ85
I've had great results out of propdrives 50-60 270KV on 6:1 using 100mm wheels. You could use a smaller propdrive and still have a great robot. I had 2 50-60 in a 4 wheel drive bot -hilarious to drive :)
TZ85a are great therefore they are discontinued :(
I'm running 28-26 2000kv motors on 4s using 100mm wheels and argos gearboxes. Nice, light and cheap. Speed is pretty good too.
Other Hobbyking ESCs can theoretically be hacked with Simonk firmware. I'm going to have a go on a 100a esc first with SimonK then with the brushed code to see how it turns out.
I've got a compiled list of what I plan on using, if you guys could go through and give me opinions that would be great.
4x DeWut drill motors
2x Ragebridge2
4x 4" Colson wheels
Zippy Compact 5000mAh 6s 60c
I would have thought the Ragebridge were OTT for a feathweight, and a 3.3 amp battery easily handles the 3 minute battles.