05-23-2018, 08:30 AM | #121 |
owner, Holmes Hobbies LLC Join Date: Nov 2004 Location: Volt up! Gear down!
Posts: 20,290
| Re: Hobbywing Xerun AXE |
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05-23-2018, 09:35 AM | #122 | |
Quarry Creeper Join Date: Jan 2017 Location: Olathe
Posts: 361
| Re: Hobbywing Xerun AXE Quote:
Even with a slower spinning motor, the more you gear down the slower the truck will run with that minimum RPM. So really following Holmes' advice could actually make your truck run slower, but then give your more power when you want/need wheel speed. There really is no downsides to Volt up Gear down besides having to buy higher voltage batteries. | |
05-23-2018, 10:35 AM | #123 | ||
Moderator Join Date: Sep 2008 Location: PA
Posts: 13,922
| Re: Hobbywing Xerun AXE Quote:
Quote:
So typically I run a 35T brushed motor. Would I have to choose a different turn motor on 4S? Same goes for brushless. My Bomber has a 3500kv Puller Pro. It's already too fast for my liking, but I have yet to change gearing. Would I have to go with a lower kv on 4S to maintain the same speed? Eventually you'll run out of gearing choices. | ||
05-23-2018, 10:44 AM | #124 |
RCC Addict Join Date: Jun 2017 Location: Canada
Posts: 1,742
| Re: Hobbywing Xerun AXE
3500kv on 3s with stock 12T is about 21.51mph 3500kv on 3s with a 10T is about 17.92mph 2700kv on 4s with a 10T is about 17.94mph I think the bomber is able to go down to 9T and you can up the spur to 68T. Plus all the EXPO from rhe radio and throttle curves from the ESC... But we are getting off-topic from the Xerun AXE... Last edited by Jboucher; 05-23-2018 at 10:46 AM. |
05-23-2018, 11:00 AM | #125 |
owner, Holmes Hobbies LLC Join Date: Nov 2004 Location: Volt up! Gear down!
Posts: 20,290
| Re: Hobbywing Xerun AXE
Robert hits a great point in great terms. The startup speed of a motor does not change when voltage changes, so by gearing down a truck and using higher voltage you can gain slower startups as long as the controller has the PWM range and throttle resolution. 35t will run 4s no problem. At least mine do. In regards to the 3500 Puller, there really isn't a need to run 4s. But 3s is certainly better than 2s. As you say, there is a point where you can't gear down any more. Run 3s, gear that sucker down since you have more than needed wheelspeed, and go from there. If you geared down and then needed more wheelspeed back, it's a perfect time to add more voltage. |
05-23-2018, 11:04 AM | #126 | |
RCC Addict Join Date: Jun 2017 Location: Canada
Posts: 1,742
| Re: Hobbywing Xerun AXE
So 2700kv 4s geared down to 10/68 would make more sense in a crawl / trail rig and the 3500kv 3s on stock ratio is for rock racing / U4 right? Quote:
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05-23-2018, 11:17 AM | #127 |
owner, Holmes Hobbies LLC Join Date: Nov 2004 Location: Volt up! Gear down!
Posts: 20,290
| Re: Hobbywing Xerun AXE
more or less. It's always a balance of needs though. A 3500 on 3s geared down would probably have a lower center of gravity due to battery height. A 2700 on 4s geared down would have a cooler running ESC and battery, if it was being pushed hard enough. Performance wise (assuming the ESC and battery can handle the amp draw without issue), the two systems would be nearly identical in performance since the motor spins about the same speed. A lot of U4 racers are even running the 3500 on 4s now. Then we would be comparing to a 2700 on 5s, which would present a problem of battery fitment in the rig. Hence why many U4 racers stop at 4s and then choose the KV based on that voltage. |
05-23-2018, 04:20 PM | #128 |
I wanna be Dave Join Date: Jun 2016 Location: Austin
Posts: 6,005
| Re: Hobbywing Xerun AXE
I picked up a couple 4S packs to use in my HH Revolver 1800kv build, and the 4100kv HH Puller Pro 540-L "R" motor will get 3S power, with under-driven axles front and rear. The 4100kv is rated at a higher RPM level than the lower-kv Puller Pros, 60,000 instead of 50,000. Should be fun! |
05-24-2018, 12:30 AM | #129 | |
Pebble Pounder Join Date: May 2015 Location: UK
Posts: 185
| Re: Hobbywing Xerun AXE Quote:
It's about time someone brought out a new sensor wire standard. Never understood how a fragile plug from an early 80s computers became tolerated or worse, accepted. I hope HW put this on a public license, free to use so it can become the new standard. | |
05-24-2018, 01:31 AM | #130 | |
RCC Addict Join Date: Jun 2016 Location: Germany
Posts: 1,364
| Re: Hobbywing Xerun AXE Quote:
First Test Drive ended after 30min with a 2WD yeti but back to topic i think hw gives us a new option with some good ideas. especially the sensor wire And they rate esc and motor ip67 i may give it a try for my trex, but i would like a 2800kv - 3000kv option hopefully they will release this option in the near future. Last edited by magic_yeti; 05-24-2018 at 01:34 AM. | |
05-24-2018, 06:54 AM | #131 |
Moderator Join Date: Sep 2008 Location: PA
Posts: 13,922
| Re: Hobbywing Xerun AXE I don't think this plug will become standard, but I do agree we need a new standard. The current sensor cable is, to put it bluntly, fragile and unreliable garbage.
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05-24-2018, 07:12 AM | #132 |
owner, Holmes Hobbies LLC Join Date: Nov 2004 Location: Volt up! Gear down!
Posts: 20,290
| Re: Hobbywing Xerun AXE
I certainly agree with sensor ports being terrible. I'm not a fan of hard wires coming out of the case with a plug in the middle, but at least they are trying something different. I've also been working on a new standard. The last decision is between a 6x1 or 3x2 plug body.
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05-24-2018, 08:22 AM | #133 | |
Rock Crawler Join Date: Jul 2017 Location: BC, Canada
Posts: 742
| Re: Hobbywing Xerun AXE Quote:
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05-24-2018, 08:47 AM | #134 | |
Moderator Join Date: Sep 2008 Location: PA
Posts: 13,922
| Re: Hobbywing Xerun AXE Quote:
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05-24-2018, 08:57 AM | #135 |
Rock Crawler Join Date: Jun 2011 Location: Tifton
Posts: 590
| Re: Hobbywing Xerun AXE
Was just told MSRP is going to be $250. Not sure what street price will be I assume pretty close to that or that exact amount. |
05-24-2018, 09:01 AM | #136 |
owner, Holmes Hobbies LLC Join Date: Nov 2004 Location: Volt up! Gear down!
Posts: 20,290
| Re: Hobbywing Xerun AXE |
05-24-2018, 09:18 AM | #137 |
Moderator Join Date: Sep 2008 Location: PA
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| Re: Hobbywing Xerun AXE |
05-24-2018, 06:44 PM | #138 |
Rock Crawler Join Date: May 2018 Location: USA
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| Re: Hobbywing Xerun AXE |
05-24-2018, 06:46 PM | #139 |
Rock Crawler Join Date: Jun 2011 Location: Tifton
Posts: 590
| Re: Hobbywing Xerun AXE |
05-24-2018, 08:01 PM | #140 |
Rock Crawler Join Date: May 2018 Location: USA
Posts: 792
| Re: Hobbywing Xerun AXE |
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