Thread: Tachometer
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Old 08-11-2009, 03:42 AM
Coval_PL's Avatar
Coval_PL Coval_PL is offline
Motorized Bicycle Senior Member
Join Date: Jul 2009
Location: Gdynia/Poland
Posts: 57
Default Re: Tachometer

I made a quick calculation and if 1000RMP would be tepresented by 10km/h, the "wheel size" in cyclocomputer must be set to around 8cm. (wheel size setting resolution is 1cm). I hope this little computer can be set to this value and hold this frequency.

My calculation:
10km/h = 2,78m/s
1000 Rounds/Min=16,66 Rounds/Sec
so: 2,78ms / 16,66 R/S = 0,1669 = 16,69cm

Magneto has 2 poles so it makes 2 tacts per round, that mean 16,69cm mus be divided by 2. It gives result around 8cm (exacly 8,35cm).

The same calculation has to be done for US miles/h.
Am I right?
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Last edited by Coval_PL; 08-11-2009 at 04:28 AM.
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