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Old 09-27-2015, 11:33 AM   #51 (permalink)
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Quote:
Originally Posted by CFECO View Post
Unlike that "King Of The Hammers" craziness !
Thats rock racing.

400+ horsepower and 2.5 ton axles on a 4-5000 lb rig.

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Old 09-27-2015, 12:15 PM   #52 (permalink)
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the king stuff is interesting, but section for section (except crevice straddling) a dirt bike, and a very skilled driver, is a good combo. jumping is a lot easier at 300 lbs vs 5000, especially when you can kick with your foot and have it make a difference.

https://www.google.com/webhp?sourcei...0the%20hammers
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Old 09-27-2015, 05:00 PM   #53 (permalink)
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How about this: At :47 to 1:18 he goes down and back up the face of an 8ft boulder. Then he rides it in the mud and cleans the wheels off in the creek.

All Terrain Vehicle That Fits In A Suitcase

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Old 09-27-2015, 05:39 PM   #54 (permalink)
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It's no hybrid, but I like it. I love how he used it like a ladder then lifted it up the rock by hand It looks like it was running out of steam on the one climb though, but top speed is 37mph.

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Old 09-28-2015, 09:46 AM   #55 (permalink)
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Those independent wheel ones are crazy. Mine would be solid axles, though likely custom built with the motors where the diff is, and shafts to the wheels somewhat like normal. I've considered running some gearing, likely in the form of transfer case guts, basically like a Klune-V if you've ever seen those. Thats basically what was inside my doubler in the S10. That would be relatively simple, cheap, and plenty strong. For weight, i think 1500-2000 lbs is probably feasible without considering how much the batteries would weigh. I dont have a good idea yet of how much weight it would be if i used lead acid based. This thing would probably be about the size of a side by side, but with larger tires.
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Old 09-28-2015, 01:06 PM   #56 (permalink)
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You would need gear reduction no matter how you do it.

With a 37" tall tire at 30mph your tires are turning at about 272 rpm, at 1mph you would be way out of the efficiency range of an electric motor.
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Old 09-28-2015, 05:24 PM   #57 (permalink)
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Planetary gears.

With a hub you could two speeds forward. Hubless you could get a portal axle with variable ride height/wheelbase.
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Old 09-29-2015, 10:08 AM   #58 (permalink)
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The gearbox would basically have to be between the electric motor and the hydraulic pump. There would also likely be gearing between the hydraulic motors and the wheels, equivalent to the differential. I dont know what the ratio would be at the axles, but the transmission would probably be one or two planetary sets from something like a NP231 t-case. If I used two sets, it would net 1:1, 2.7:1, and 7.4:1 as selectable choices.

I guess I should have been more specific and made the distinction between fixed gearing and selectable gearing. I have known fixed gearing would be required from the outset.

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