does any one no what the difference is between a esc and a bec?
'
because i just bought a sanwa kit which includes 2x servos, reciver, transmitter and a bec.

You are thinking of it in the wrong way. An ESC can come with or without BEC. I think BEC stands for Battery Elemination Circuit.
BEC is part of the circuitry.

An 'ESC' is an electronic speed controler. A 'BEC' is a battery eliminator circuit. Some ESCs have BECs, some don't. The BEC just eliminates the need for a seperate receiver battery. An ESC takes the place of the old variable resistor which used to be how voltage level was determined and fed to the motor(s). There are definite advantages with using an ESC. Not anywhere near the amount of wasted power that the resistor had (heat), and much finer control of speed.
That help?
- 'Doc

thanx 4 the help

i am going to in stall that sanwa servo kit in an electric boat i have, it comes with a bec but not a esc.

do i need the esc? and also i cant decide which motor i should get so ive posted a topic called "what motor should i get"

have a look at topic a have a say at what i should get,

but thanx anyway

cheers

is there an esc in this picture?

no, there is no ESC in your picture.

The ESC is an "Electric Speed Control" it lets you control the motor rpm.


Look at the pictures below.

The first is a system with an ESC without BEC.......thats why you see 4 reciever batteries

The second picture shows an ESC with BEC function, where he has eliminated the 4 pack reciever battery pack. the reciever and servos now run on power from the large motor batt pack.

that set up of the brushless motor , might not be the best
it has 3 wires comming from it
ground pos/neg. it may confuse !
but ya
uh you dont need to post another topic , you can just ask the question here

kandy u no ur blade im gonna find a kysho dolphin for my nqd. i no wat an esc is, i just need to no weather or not i need it to power the boat.

thanx for ur help

zane

what ?
i could barley understand that !
OK well what i got from it is ..... uhhh OK
well the esc i used in the boat was a pro boat water proof one and the motor i ran was a 16 turn mostly !
but the esc is crap , it blew up on me running the boat with 6 cells and a 550 motor ! like literally blew up and caught the boat on fire , so know i don't run it any more
so any way i would suggest you finding a different esc , and when u buy the dolphin you get every thing and a stock 550 , it will give big speed compared to your ndq
and yes u need a esc to power your boat ! unless ..well im not even going to get in to this

An ESC gives you control of the speed of the motor. Without one the motor is either on or off, nothing in between. An alternative to an Electronic Speed Control is a variable resistor, not the best choice as there is a lot of wasted power which takes the form of heat. Enough wasted power (heat) and you have a fire, and shorter run-times too. It's up to you whether to use one or not.
- 'Doc

It isn't strictly necessary to use an ESC. Use a servo to control the motor's on/off. There are draw backs to that, such as bad slow speed control, and much more heat generated. It can be done, some of the 'toy' boats do it that way.

Hi Zane and everybody

I will take a stab at this. All of you have missed the other bec. The one built into the receiver. All the receivers I have can take up to 8.4 V directly into the battery input . The receiver has a built in voltage regulator that converts it into 5v.
Why do this ? Well many of the mechanical speed controllers simply had a wire with a plug on the end to plug into the battery port of the receiver.I have used some of these. The voltage was taken directly from the main battery. As long as you only ran six or seven cells ,you were ok. There are few doing this today but the receivers are still made this way. Getting your receiver power from a bec equiped ESC may or may not work well in boats. A lot of motor noise gets directly into the receiver from a bec equiped ESC. I have had this go both ways for me. The ranges we operate boats in are far greater than you run cars in. Your radio signal can be overpowered way too easily by motor and esc noise .
n.h.schmidt

n.h.schmidt ,
I haven't seen the circuit diagram so not really sure about a voltage regulator circuit in the typical ESC. Off hand, I'd say that there probably is one, just makes good sense (unfortunately, what makes good sense to me doesn't always to manufacturors). But, the primary purpose of a BEC is to eliminate the receiver's batteries (weight/space), not voltage regulation. You're right though, there usually is one in the typical receiver ('nuther one of those 'good sense' thingys).
- 'Doc

Hi Doc
The typical bec output voltage from nearly all ESCs is 5V . It is that regardless of the number of cells being used as the main battery. That means that the bec voltage is regulated. The highest cell count I have seen and still use the bec from the esc is 14 cells. The regulaters can't cover more than that wide range of voltage . The boat esc I'm thinking of is the Tekin 432. When using more than 14 cells you have to disable the Bec and use a seperate receiver battery.
Only the opto isolated ESCs transmit no noise at all into the receiver. All of them need a seperate receiver battery. They are worth it though. You get the maximum range ,even with low cost AM radios. n.h.schmidt

How/why would using a seperate battery pack for receiving affect range? Endurance maybe, but range?
- 'Doc

so its ok to not use a esc, im greatly confused now, all i needed to know if its ok to not you'se an esc

im all confused about this over heating jargon and it probly wont affect the speed of the motor itill just

be one speed, fast!

sure i know alot about the boating hobbie. (i acculay have a boat with a small out board so i have to

mantain it.) and i have grown up with motors and electornics, but ive just been swamped with 1000
things insted of just one main thing i need to know

, but anyway all i need to know is that "do you need an esc or not",and not this word mumbo jumbo

,but any how ill try to figure out what serious things you guys are talking about.(im serously startin 2 worry)

thanx 4 all ur help

zane

I seem to be confusing more than helping, so I'll quit.
- 'Doc

nah i found wat u meant. i got confused beacuse you and this other guy were talking it up about somthing and it didnt look at ur past posts. when you guys were talkin bout serous stuff i looked at your present posts and not your past posts which were understandable.

but can i power my boat with that servo kit i have?