Guys, i'm going to buy a TX, next year[&o], but i want to ask something that i can't get it. I have a walkera 36 which has a receiver with 4 channels and 2 linkages that come out of one hole of the receiver. These linkages are the power supply and the motor supply. The receivers i see know, have NOT such linkages come out of the receiver. They are channels like the other.

Hi,
You are describing the difference between an stand alone receiver and an all-in-one receiver/speed control/gyro/mixer.
A stand alone receiver has an antenna and a series of pint to plug servos into. Power for a stand alone receiver comes from either the speed controller or a separate receiver battery plugged in to one of the servo slots.
An all-in-one unit provides the functions of a stand alone receiver, as well as an incorporated speed control(s), a gyro and the revo mixer.

OK[&:] Look, i'm a bit amateur with these things. I was searching before and...i decided that i'm definately goin to buy the Futaba 9C Super radio. It comes with a R149DP receiver. How i will connect my heli. The heli has a Gyro only. I don't know about any ESC (Speed Controller) or anything else. Please, tell me what to do. A few pictures will also help.[8D]

First you have to find out whether the motor is brushed or brushless then buy an esc for it. The esc (electronic speed controller) should also have a bec (battery elimination circuit) which will plug into the receiver and give it and the servos power. The other connections should be clearly listed on the instructions for the recevier.

The linkages will be like that?

BATTERY _ RECEIVER _ GYRO _ REAR TAIL ROTOR BLADES SERVO
****************L ESC _ MOTOR POWER
****************L RIGHT/LEFT SERVO
****************L FORWARD/REVERSE SERVO
****************L MAIN ROTOR BLADES PITCH SERVO

IS THAT CORRECT?

No, the ESC/BEC would plug into the battery, the ESC would then provide power to the motor while the BEC would plug into the receiver.

Battery > ESC > Motor
Battery > BEC > Receiver > servos and gyro (tail servo connects to gyro)

Sorry to ask you that, but...what is a BEC (battery elimination circuit)?????????//

the bec is what cuts down the power for the servos....the motor needs a lot of volts but the servos will get fired if you but that many volts on them....so the bec cuts the power down from say 11.1v to 6v or whatever the servos need.

Can you show me any of these BEC? Towerhobbies or something?

http://www.hobby-lobby.com/ubec.htm

try that out

http://www.unitedhobbies.com/UNITEDH...idProduct=4319

and there is one for a good price, the first link is a good detailed description of the UBEC

I understand perfectly, except one thing. If i buy a BEC and a (ESC with a BEC) can it work? Also, if i understand the shape i see in the site, the WHOLE voltage of the battery get through the ESC and gave it to the motor. But this does not make sense. The motor will be cooked.

how will the motor be cooked? the motor needs all the volts to run....the esc (using a bec or not) give the motor full power....when the motor is not at full rpm, the esc is still giving the motor max volts its just breaking the current....kinda like flicking the light switch on and off really really fast.

Ok, i think i'm starting to understand now. Well, is time for a nap right now here, so good night. See ya tomorrow

Please understand that for your size heli you don't need a separate esc and bec, you can get an esc with integrated bec. This will keep the cost down and reduce the wires.

To understand the relationship between voltage and amperage, think of a water pump, the voltage is the force of flow and the amperage is the amount of flow.

what size heli do you need to start thinking about getting a UBEC?

It's not really about the heli size but more about the battery (they are linked of course). The integrated bec used on an esc which is connected to a 11.1 volt battery doesn't have to work that hard in order to get down to 4.8v which is what your receiver and servos want (mostly, some will work on 6v but lets assume it's 4.8v). When you move up to a heli larger than 500 size though you tend to start using 22.2v batteries. This means the bec must reduce the voltage from 22.2v to 4.8v or 6v. This is when you want a separate bec, the amount of voltage drop can create a lot of heat and stress which can not only affect your esc, but also make the bec fail entirely, this would fry your receiver and servos.

And what voltage the servos use to have?

the servos run on 4.8v to 6v, just depends, a lot of the servos ive seen will run on anything in between and will work faster the more volts you give it up to 6v.....

Operating Voltage: 4.8-6.0 Volts
Operating Temperature Range: -20 to +60 Degree C
Operating Speed (4.8V): 0.17 sec/60° at no load
Operating Speed (6.0V): 0.14 sec/60° at no load

see it operates anywhere between 4.8 and 6 volts but look at the speed, 4.8 its .17secs and 6volts its .14, .03 seconds faster....not sure if you could tell the difference with that small amount but i guess every little bit helps.

One more question. You said that the voltage of the battery through ESC goes to the motor. If the battery(ies) is/are 23V? The motor???[][&o]

the batt isnt 23v, usually its 7.8 or 11.1....and im sure whatever batt you have the volts it puts out is needed by the motor (bigger batt = bigger motor)

Lets be clear here, the Walkera DOES NOT use a 22.2v battery. Someone else asked when you would need a separate bec and I answered.

The walkera probably uses a 7.2V or 11.1 volt battery, all servos will accept 4.8v but some can also function on 6v.

What you need is a 6ch tx/rx, find out whether your motor is brushed or brushless, buy the appropriate esc w/ integrated bec, if you need a gyro then get one of those as well (not sure if the walkera has it in the 3in1 or not).

Yeah, my walkera has receiver, ESC, BEC all in one. So, i could not understand some things. But now, i think that i have the appropriate knowledge. Thanks guys!!!