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Home✈️Aircraft🚁Helicoptere-Synergy R/CSynergy 696 › 696 pinion ?
NEW  07-20-2021 10:32 PM  8 days ago
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slayer

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las vegas n.v

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696 pinion ?
Folk's what would be got for the 696 and a ode 4530 535hv motor a 13t pinion 12t pinon or???
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NEW  07-21-2021 05:31 AM  8 days ago
Rojoalfa

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RPM = (volts x KV / spur) x pinion

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NEW  07-21-2021 05:33 AM  8 days ago
Rojoalfa

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The difference in RPM between 12 and 13 is about +8.33%.

So, for example, if your Calc RPM with 12 is 1800, with 13 you will get 1950.
The final choice it depend on ESC capability. If you have plenty of power, get the 13.

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NEW  07-21-2021 05:31 PM  7 days ago
slayer

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I using the hobby wing 160a is the 13t pinon with a 535 kv would good for 1700-1900 rpm ?
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NEW  07-22-2021 02:07 AM  7 days ago
Rojoalfa

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To answer your question, Let do some Calcs...

Power pack
12s, 44.4 volts

Spur 139
Pinion 13
Ratio 10.69

Motor kV 535
Coeficient 0.95

Max rpm = (44.4 x 535 /139) x 13 x 0.95

Max rpm = 2110 rpm

Your 700 class heli need to fly, 3000 watts.

Power = volts x amps

Power= 3000 watts
Volts = 44.4

Amp?

Amp = power / volts

Amp = 3000 / 44.4

Amp = 67 amps.

You will need a 67 x 2, aprox 120 amp ESC.
Security factor of 2.

With a 160 amps ESC, you will have plenty of power.

Base of rotor speed limitation, you may run your heli at 1900 rpm, without resonance.

BTW, 160 amps ESC it is too much.

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Saludos cordiales,
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NEW  07-22-2021 02:23 AM  7 days ago
Rojoalfa

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As you can see... To fly at 1700 rpm, it is better to install the 12 pinion...

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Saludos cordiales,
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