#### garygid

##### Well-known member

Well, at 12 mph with a 12" radius wheel, that would be ...

about 0.05 rpm ... maybe not perfect yet?

about 0.05 rpm ... maybe not perfect yet?

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- Thread starter GeekEV
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Well, at 12 mph with a 12" radius wheel, that would be ...

about 0.05 rpm ... maybe not perfect yet?

about 0.05 rpm ... maybe not perfect yet?

Ahemgarygid said:Well, at 12 mph with a 12" radius wheel, that would be ...

about 0.05 rpm ... maybe not perfect yet?

Two arithmetic errors on my part. Flipped the gear ratio (wheel spins 1/8 the speed of the motor, not 8x the speed) and multiplied when I should have divided when moving the resulting omni-constant to the other side.

RPM of motor = MPH / (0.000744 * Effective Tire Radius)

So now at 12MPH and 12" wheel radius, we get 1344 RPM. Much better. At 90MPH and 12"R wheel, we get 10,080 RPM.

(It is now 10:30AM for the record...)

=Smidge=

Perhaps easier for most is:

RPM = 1344 * (MPH / Radius)

So, for every "radius" worth of MPH, you get an additional 1344 RPM.

Assuming 12" radius:

(for quick mental math)

12 mph = about 1350 rpm

24 = 2700

36 = etc.

48 = 5400

60 = 6750 (approx)

Or, for quicher mental math:

about 100 rpm (plus an extra 10%) for each MPH

OR,

each 10 mph is about 1100 rpm.

50 mph => 5000 + 500 = 5500 (approximately)

60 = 6600 rpm (close to the 6750 above)

70 mph = 7700 rpm

30 mph = 3300 rpm

20 = 2200

Easy-Math, right?

Now, what is the real effective radius at 40 psi ... etc.?

oh I see where you may be going . . . . carwings data gets logged & Nissan uses it to deny potential issues that may be potentially related "abuse" issues ?? The car logs that data independent of carwings, so I wouldn't worry. You're busted either way.BruinLEAFer said:Is speed data reported to Nissan via CARWINGS?

Of course, driving off a cliff, flipping the car, etc. MIGHT be exceptions.

Fairly academic though. I don't think anyone is going to be wanting to spend much time burning e-fuel at that rate.

92mph.... or so I heard :roll:

I was too busy keeping my eyes on the road and watching for other traffic. :lol:Stunt822 said:When travelling steady at 94MPH - how much energy was drawn by motor percenter display?

If I get another shot at it I'll try and gather that info. Don't want to get a ticket ya know...

Don't think of it as a speeding ticket - think of it as a third-party verification certificate! Have it framed!GeekEV said:If I get another shot at it I'll try and gather that info. Don't want to get a ticket ya know...

"I got caught doing 90+MPH in my 100% Electric LEAF (and all I got was this lousy court summons)"

=Smidge=

That would be one expensive verification certificate! :lol:Smidge204 said:Don't think of it as a speeding ticket - think of it as a third-party verification certificate! Have it framed!

"I got caught doing 90+MPH in my 100% Electric LEAF (and all I got was this lousy court summons)"

garygid said:Any car's indicated speed (designed to DISPLAY high) needs to be checked against a simple handheld GPS's speed (almost always quite accurate).

Here's my speed record...

In reality taken while aboard a B-737-800 headed east (with the jetstream as a tailwind)

mwalsh said:

WHEEEEEEEEEEEE1 Pull ovah, BOY! Lemme see yo license an' registration. What is dis ting yer drivin anyway? :mrgreen: :mrgreen: :mrgreen: :mrgreen: :mrgreen: :mrgreen:

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