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Century Radikal E640 - Swift 16 NX
› Limit voltage to the tail
10-19-2004 08:52 PM  13 years agoPost 1
RC-Hawk

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Westminster Colorado

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This is for the electronic people in the group.
Looking for a way to "limit" the voltage to 10.6 volts to the tail motor. I would just like to stop anything over 10.6 from getting there.

Thoughts?

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10-19-2004 09:07 PM  13 years agoPost 2
1500valk

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Northeast Indiana

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maybe a zener diode? not really sure, on this, though. i just know they have a voltage limiting property.

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10-20-2004 01:00 PM  13 years agoPost 3
RC-Hawk

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Westminster Colorado

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Ok... Here's a thought, (don't know why I didn't think of this before, instead of putting all of this effort into a "new" solution). I have not had time to try it yet, but I will tonight.
With the Pixie 7-p that I use for the tail, why not throw a meter on the tail motor and adjust the endpoints down with a freshly charged pack, until the voltage is less than 10.8 volts. (10.8 is the max voltage for the ED-50 according to GWS).

Has anyone else tried this?
What were the results?

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10-20-2004 01:34 PM  13 years agoPost 4
jshaw001

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Ames, IA

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try using a zener diode there is a pretty constant 0.7 voltage drop no matter the current that would be a little lower than what you want but that should do it
did you get that gliching problem solved?

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10-20-2004 08:11 PM  13 years agoPost 5
Yukonho

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Montreal, Quebec,​Canada

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TREC by Dionysus Design is a 5A speed control that has a 17 point programmable throttle curve. You can limit it to whatever maximum voltage you want.
It is a great speed control, and has built in Revo mixing if you dont have a HH gyro. The mixing curve is way better than any mixing you will find in any transmitter.
It is by far the best way to go.
colin

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10-21-2004 04:12 PM  13 years agoPost 6
genovia

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N UR NECK OF DA​WOODS

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diode. .75cents

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10-21-2004 04:50 PM  13 years agoPost 7
RC-Hawk

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Westminster Colorado

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Ok.. I went and got 4 1n5402 (they were out of 5401's).
When I drop these in, how much is it going to hurt the performance of the tail?


------- Waiting for the new HB CP upgrade kit to come out ------

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10-21-2004 05:27 PM  13 years agoPost 8
jshaw001

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Ames, IA

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well .7 less volts going to the tail, just try it out and tell how it works.

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10-22-2004 08:26 PM  13 years agoPost 9
ericfly

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Cornwall, UK

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The 1N5402 is rated at 3 amps I think, so it should be ok. You should get a volt drop of about 0.6v per diode (wired in series.. obviously ).

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10-22-2004 08:44 PM  13 years agoPost 10
hb76

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Massillon, Ohio

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Not to change the subject. But how many of you installed the double tail motor mod? Should I use the stock or high power motors for this upgrade? Then how should one go about wiring up the motors (series or parallel)?

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10-22-2004 09:38 PM  13 years agoPost 11
jshaw001

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Ames, IA

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well I tried it and the tail seems fine I don't have any problems with tail authority the 10v or so seems like plenty.
--Jason

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10-23-2004 09:58 PM  13 years agoPost 12
genovia

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N UR NECK OF DA​WOODS

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i posted a pic of my tail here http://www.runryder.com/helicopter/t129028p1/

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10-24-2004 01:32 AM  13 years agoPost 13
Satoer

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Zaandam, the​Netherlands

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Ok... Here's a thought, (don't know why I didn't think of this before, instead of putting all of this effort into a "new" solution). I have not had time to try it yet, but I will tonight.
With the Pixie 7-p that I use for the tail, why not throw a meter on the tail motor and adjust the endpoints down with a freshly charged pack, until the voltage is less than 10.8 volts. (10.8 is the max voltage for the ED-50 according to GWS).

Has anyone else tried this?
What were the results?
That’s not gonna work

The controllers are pulsing with a high frequency the full voltage on the motor. (on…off…on….off…on…off…)
The shorter gaps between the pulses makes the motor turn faster. Longer gaps between the pulses makes the motor turn slower. But the motor always gets his ass kicked with the full battery voltage.

Cheers Michel.

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10-24-2004 01:38 AM  13 years agoPost 14
alanhsu

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Vancouver, Canada

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Try DD tail.
keep everything light.
let thrust run over the motor

My runs cold/warm after 3 min flight.
not even really warm. just a tiny bit of warmth.

No need to limit the voltage since it seldomly runs at full rpm thus you won't kill it due to overheating.

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10-24-2004 01:41 AM  13 years agoPost 15
alanhsu

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Vancouver, Canada

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Also I am not sure, guys always talk about high or low frequency controller and stuff.

But I use regular GWS controller with DD tail.

My DD tail never gets warm and still works after countless flights.
When I use a digimeter the voltage shown always correspond to the thrust the tail is providing. So if I keep the throttle of the tail low then the voltage displayed is also low. Am I getting a correct reading???
Anyways, it works as it is on my and I never needed a TREC esc or anything. Also, I would buy a BL tail motor and Not a TREC esc if I was to spend that kind of money. (why not go all the way! haha.)

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10-24-2004 02:48 AM  13 years agoPost 16
jshaw001

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Ames, IA

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I'm going with Satoer on this one
tail motor controlers(or any bushed controler that is) work on a pricipal called PWM (pulse width modulation) meaning that instead of varying the voltage going to the motor the full voltage is pusled to the motor, longer the pulses the faster the rotation. They do this because it's way more efficient than burning off the extra voltage as heat (think non electronic,but manual speed controls for cheap RC cars that's why they suck) So the high frency ones just have a higher switching freqency less time that the full voltage is applied to the motor (motor duty cycle is a little less, longer for the motor to cool a bit) so they last a little longer.

you can measure the voltage at the tail motor but, non but the highest end volt meters, have enough resultion to measure the constant pusles (you run into a situation alot like trying measuring AC voltage with a DC volt meter) so you end up with a somewhat average voltage. (if your volter meter has, set it to frequency counter mode and hook it up to the tail)

anyways the best way I see to counter with is
to use a zener diode and get a .7 drop and bring the voltage down to a level that is within the specs of the motor.

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Century Radikal E640 - Swift 16 NX
› Limit voltage to the tail
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