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[TBC] Rumble in the Jungle - November 2017 - Heavyweight
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marto
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[TBC] Rumble in the Jungle - November 2017 - Heavyweight

Location: TBD
Weight Class: Heavyweight
Note: Must be off road capable



Invite only

Steve
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Steven Martin
Twisted Constructions
http://www.botbitz.com

Post Fri Mar 17, 2017 12:04 pm 
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Nick
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Shocked standard HW weight?
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Post Fri Mar 17, 2017 12:10 pm 
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DumHed
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In
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Post Fri Mar 17, 2017 1:17 pm 
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Glen
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Must beat Andrew so i guess in as well Shocked
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Post Fri Mar 17, 2017 1:44 pm 
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Nick
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No Marathon bots allowed! (unless you can lend me one as well Laughing )
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Post Fri Mar 17, 2017 2:07 pm 
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Glen
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Lol if only!
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Post Fri Mar 17, 2017 2:10 pm 
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DumHed
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it's ok, they are over the weight limit.
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Post Fri Mar 17, 2017 3:19 pm 
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Nick
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Hey Steve, is there any guide about how 'off road' the arena might be? Are we talking smoothish grass or rocks and ditches with water?
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Post Fri Mar 17, 2017 3:35 pm 
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chunkulator



Joined: 27 Jul 2016
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This sounds awesome. I assume somewhere south east qld?

Post Fri Mar 17, 2017 10:06 pm 
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Nick
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I always wanted an excuse to use this type of 'wheel':



I don't know what those things are officially called, but they look like they could be made very tough.
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Post Fri Mar 17, 2017 11:36 pm 
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andrew



Joined: 16 Jun 2004
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This will be easier than building a featherweight for me. Got a stack of old power chairs at work I can mod.

So off road arena and usual weapons etc
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Post Sat Mar 18, 2017 7:33 am 
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Cpnwolfe



Joined: 29 May 2012
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Location: Rockhampton/qld


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i like where this is going
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Post Sat Mar 18, 2017 3:32 pm 
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evil_steve



Joined: 06 Sep 2015
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Location: Adelaide, SA


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Looks at pile of scrap metal in the garage

Soooo, what would be the cheapest/easiest drive motor/ESC option for a scrapheap heavyweight? Finding an old electric wheelchair or mobility scooter from somewhere? Asking for a friend ...

Post Sun Mar 19, 2017 2:48 pm 
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Nick
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Your friend should definitely look at wheelchair motors Wink. There are no really cheap options for heavyweight ESCs; even the cheapest ones are quite spendy.

Some of the possible ESCs are:

Vyper 120A single channel - probably better with 4WD and lower powered motors

RoboteQ 150 to 300A - they have some absolute beasts at beastly prices

IFI Victor 120A - similar to the Vyper but hard to find nowadays

IFI Victor BB 300A - very compact for the current rating and better bang for the buck compared to the RoboteQ controllers. These would be my personal pick for larger HW drive motors.

If your friend finds some four pole motors it might be possible to drive them with two TZ85a ESCs. As there are two separate circuits in a four pole motor, its fine to use a pair of ESCs on the one motor.
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Post Sun Mar 19, 2017 3:11 pm 
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chunkulator



Joined: 27 Jul 2016
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The TZ85A has a place on the board for a fourth set of parallel MOSFETs. i might consider taking the unused FETs off the third channel of a BotBitz-configured TZ85A and putting them into the main outputs to make a TZ113A. Looks like a kind of painful SMD rework job though. You have to pull the two boards apart and then stick them back together afterwards.

Post Sun Mar 19, 2017 4:51 pm 
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