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05-01-2004 07:28 AM  13 years agoPost 1
Sparkhead

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Melbourne Australia

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Can anyone tell me if a 4s1p pack of Tanic 2200Mah Lipos would have enough current to power an Eolo. I know that people use 5s1p and 6s1p but the current is lower in these cases. Can anyone tell me what sort of current is involved using 14.8volts on a TWIST 3700 and a 14t pinion. Is there some sort of formula or does it totally depend on the heli setup?


Mick.

Robbe & Futaba.

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05-01-2004 11:59 AM  13 years agoPost 2
Ben-T-Spindle

rrProfessor

Central Illinois

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You could hover but the current would be to high for the batteries for any aerobatics. You would probably burn up the batteries is a short time. Also the KV on the Twist-37 it to high for a 4s battery.

... BTS

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05-01-2004 02:22 PM  13 years agoPost 3
Sparkhead

rrKey Veteran

Melbourne Australia

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What makes the 37 to higher KV, can you give me a bit of information on this please Ben.


Mick.

Robbe & Futaba.

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05-02-2004 10:03 PM  13 years agoPost 4
rcaddition

rrApprentice

military

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here's an example its hard to explain but I'll try

BRUSHLESS MOTOR A... kv 2000(2000rpm per volt) with 6s lipo(22.2volts). now this motor will push out 44,400 rpm and say a 12t pinion will allow for the proper head speed.(2100-2200).

BRUSHLESS SETUP TWIST 37....kv 3700(rpm per volt) with a 6s lipo (22.2 volts). first off this motor will now push out 82,140 rpm, that's 3700 X 22.2. already the motors rpms are well beyond the max for the motor and will be damaged. next to get the correct headspeed you would have to use a 6t pinion which I don't believe anyone makes simply because it probably would come apart. alright so we have established that the twist in no way can handle the 6s packs, but even a 4s pack will require you to use a 8t pinion which is still hard to find and you will be pushing the twist rpm limit of 50000(54760 w/8t).

ok then why is the high voltage setup better? because with the high voltage setup and pinion your getting the correct headspeed from more or less- VOLTAGE, as with the twist and its pinion your getting the same headspeed but at the cost of higher current draw(amps) from the battery. and all electricians know its not the voltage that kills you its the amps.
amps(current) = heat = damage
voltage = almost no heat=better efficiency=no motor or esc damage.

play around with this calculator http://www.e-helis.com/helicalc.php

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05-03-2004 12:53 AM  13 years agoPost 5
Sparkhead

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Melbourne Australia

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Thanks rcaddition and Ben, your info was very helpful.


Mick.

Robbe & Futaba.

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