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Old Apr 13, 2003, 09:41 AM
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Throttle Tx end point adjustment and ESC


Hi
What I wanted to do:
Without changing the prop, I wanted to draw less amps from my motor.
For that, on my T9CAP, I moved back the end point of the throttle to 50%. It worked as I was doing it, but I have the impression each time I turn on and off the Tx that the controller finds the new endpoint and gives me the 10% power, even with a reduced throttle end point.
Is it true?
Can I do something else on my Tx to correct it?
Thx
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Old Apr 13, 2003, 12:56 PM
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Idea....


I JUST got a 9C and don't know exactly what to do, BUT I think if you somehow make the throttle full throw when you arm the ESC and then throw a switch (like dual rates) then the ESC would see it as a lower setting.

Not sure how to do this on a 9C yet, but I will learn as it sound like an interesting way to get some extra flight time for those of us with heavy left thumbs.

Sean
Old Apr 13, 2003, 01:33 PM
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Been There! Done That!
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No matter where you set your EPA the ESC senses the total movement and sets itself for full throttle based on that! All you are doing is decreasing the amount of stick movement to go from off to full! Not a good move! The throttle stick slides! Just decrease your throttle to a setting you like... that's why it slides!
boomer
Old Apr 13, 2003, 01:48 PM
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Boomer, Thnat's what I thought, unfortunately

Sean, that's a very good idea and I will test it. I think it might work, because once the esc has found the total curve, then I can decrease the throttle movement thru a switch.
Old Apr 13, 2003, 03:04 PM
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Unfortunately, on the 9CAP, the throttle does not accept dual rates, and I don't know how to program something which can do it.
If anybody has an idea....
Old Apr 13, 2003, 03:10 PM
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Idea....


(duplicate..sorry... Must have left a window open or something)

I JUST got a 9C and don't know exactly what to do, BUT I think if you somehow make the throttle full throw when you arm the ESC and then throw a switch (like dual rates) then the ESC would see it as a lower setting.

Not sure how to do this on a 9C yet, but I will learn as it sound like an interesting way to get some extra flight time for those of us with heavy left thumbs.

Sean
Last edited by seanm; Apr 13, 2003 at 03:16 PM.
Old Apr 13, 2003, 03:12 PM
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I found it: on p.60 of instructions, in the mixing setups, there is something called "dialled as master" which allows to assign a switch linked to another channel.
It works!
Thx for the idea
Last edited by luc; Apr 13, 2003 at 04:12 PM.
Old Apr 13, 2003, 11:26 PM
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(Big grin)


I have not scratched the surface of my 9C....Looks like it is pretty deep.

Glad to hear it worked.

Sean
Old Apr 13, 2003, 11:33 PM
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Do a Throttle-to-Throttle mix, when you throw the switch, the new end point is programmed to be lower than initial setup, no offset (a multipoint mix with graphic display helps). Also great for those ESC (eg, Cermark, FMA, Zagi) that go WOT at 1/2 stick.

Only thing you need to remember is to power on the plane (when the ESC inits.) with mixer switch off.
Last edited by Peter Khor; Apr 13, 2003 at 11:37 PM.
Old Apr 14, 2003, 03:35 PM
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Two things:

First - limiting current draw by never going to full throttle is NOT good for the ESC. Heating in the ESC is the worst around 70-80% power. Change the prop!

Second - some ESCs rescale their throw to whatever they get from the transmitter, some don't. Most have some minimum throttle "throw" they must have in order to get to full throttle (it is usually pretty small). So whether or not you can do what you want (even though it's hard on the ESC) or not depends on whether you have a fixed-endpoint or self-adjusting type.
Old Apr 14, 2003, 04:58 PM
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BEC, I think you are right.
I tested the throttle to throttle mixing. Works great on jeti 18A and mega, but not really on the astro020 and his castle esc. On this one, I have first to go full throttle and then to use the switch; If I don't go full throttle, the switch does not work...strange.
Well , I have ordered smaller props, but in these diameters, they are not ez to find (4.7*4.1 or 4.2), as I already draw close to 20A with a 4.7*4.7 cam prop.
Thx


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