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› What is the formula to find headspeed ;kv+volt???
10-28-2006 11:21 PM  11 years agoPost 1
jimboflies

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Beaumont, Texas;

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What is the formula to find head speed on electric helis;KV+Voltage+gear ratio???????? Please help???Thanks

EP8 EX twinring frame
Quick of Japan
EP8v2 EX
EP9

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10-28-2006 11:40 PM  11 years agoPost 2
nivlek

rrProfessor

Norfolk England

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Roughly ,
Multiply KV by the nominal voltage . Then multiply that by 0.8 , then divide by the gear ratio .

At the end of the day , it gets dark .

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10-29-2006 01:09 AM  11 years agoPost 3
jimboflies

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Beaumont, Texas;

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what formula do I use to get the gear ratio??

EP8 EX twinring frame
Quick of Japan
EP8v2 EX
EP9

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10-29-2006 01:11 AM  11 years agoPost 4
slider46

rrProfessor

Ocala Florida

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On the trex forum someone just posted a headspeed calculator it also does the pinion.....
I found the link for you.... http://www.readyheli.com/category_s/81.htm

Tom..... No "D" flying....

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10-29-2006 01:46 AM  11 years agoPost 5
Micro-Maniac

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Pasco,Washington Formerly: Captain Chaos

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If you still want the actual formula it's -

Find head speed -
(Motor Kv x Nominal Voltage x Motor Efficiency x Pinion Teeth) / Main Gear Teeth = Head Speed

Find pinion size -
(Target Head Speed x Main Gear Teeth) / (Motor Kv x Voltage x Motor Efficiency) = Pinion Gear Teeth

Motor Efficiency is generally around 90%.

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10-29-2006 05:06 AM  11 years agoPost 6
jimboflies

rrElite Veteran

Beaumont, Texas;

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Thanks guys !!! Got it!!

EP8 EX twinring frame
Quick of Japan
EP8v2 EX
EP9

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