Heath Lewis' 0-40mph (0-64kph) challenge

Ya I have a metr, but also track with a Garmin watch, nice to see current speed and distance on your wrist

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iT’s 30 FeEt

'MURICANS

We like our measurement units just how we like our politicians. Dumb as rocks.

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I think it said it was Ryan’s POV on the comment/video i saw

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ahh.
hmm.
idk where that is.
my internal librarian will go explode now.

Lol seeing him wobble the second time I was like shiiiit and then bam haha

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Mf. My bad lol I keep saying I’ll share it. What thread do you want me to post it in? I’ll just post the raw vid

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No duh

And that’s approximately 0.24 miles :roll_eyes:

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So have you compared their mileage and such?

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2022 Carve pdx thread would be a good spot for it. Thanks man!

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I did not know this. Thank you

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I thought there was no telemetry on the V5

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There’s data logging on castle ESCs. just not as easy for me to deal with.

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image

:smiley:

@Heathlewis was just fishing me in with the 0-40 :smiley:

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@Cyanoacrylate Watt to rpm calc says 2.29Nm per motor.
Motor 6kw 30v 800kv 25000rpm shaft speed
10/78. 7.8:1 ratio

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118Nm total on 6in diameter wheels gives 1570N of thrust, or 353lbf. No frikkin way are you accelerating at 2g.

EDIT: 800kv motors have a torque constant of 0.012Nm/A, requiring 190A phase current for 2.3Nm, maybe I was wrong. Is the 200A limit for your motors referring to phase current, or is it battery current and they can go even higher at low speed?

EDIT EDIT: 2.3Nm/motor * 7.8 gearing * 2 motors = 36Nm total, or 480N (110lbf) thrust. Still nuts, something might be up with that calculator though.

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I think I’ll just make my own calculator. @MoeStooge any idea what the numbers for your motor and drivetrain efficiency are? I’m sure I can find close numbers online if you’ve never had a reason to measure.

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based on YT, i almost pushed 1g the other day, but i’m not sure how accurate that is,

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@Cyanoacrylate Inrunners run 95% efficient and strait cut gears run 99%.
Wheel contact patch burns up some watts. We run about 30-33 watthr per mile.

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@MoeStooge what is the current limiting factor on achievable acceleration? Board torque? rider skill? traction?

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