2 questions......or maybe 3 questions

[secrtwpn1]

What is the difference between a "brushed motor" and a "brushless motor"? Can a speed control made for a brushed motor be used on a brushless motor and vice versa? Next.........on my new WTC setup, my rudder servo does not turn the rudder a great distance. I noted the servo horn has more holes on it. Could moving the servo control rod out further made it swing wider for the rudder?

Thx
Farlan

[apa-228]

Answer to the first is a brushed motor uses brushes to run current into the commutator/armature assembly to spin the motor shaft to which they and the prop shaft are connected. The brushes arc a bit and cause rf noise if not properly damped by capacitors, and generally run slower than brushless motors. The brushless motors,as the name implies, do not use brushes, are more efficient and run at a higher RPMs.
Answer to the second - as far as I know no, the technology is totally different..
Answer to the third, NO - the further out the LESS rudder swing you will have. For more rudder throw get closer to the rudder shaft, and use ball link fittings which are easier to get close without worrying about the servo horn hitting the link.

[greg w]

actually there are a select few esc that claim to work for either but Generally speaking they are not interchangable. Moving the connection point out on the servo arm will increase how far the linkage travels and increasing the throw. By moving the linkage in at the rudder end will translate the movement to more rotation as well. also depending on your radio you may be able to program more rotation into the function

[Ralph --- SSBN 598]

I found this and copied it here.
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Why is a brushless motor better?
A brushless motor loses the brushes and the commutator. ... Because the copper windings are on the outside of the motor configuration, there is room to make them larger. Brushless motors also don't have the friction and voltage drop that brushes create by dragging against the spinning commutator.
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The Speed controller for one will not work with the other as far as I know.
The brushed speed control has two power wires that increase of decrease the current tot he motor which is relative to the motor speed. The controller also if designed to, will reverse the current direction giving the motor both forward and reverse direction.

The brushless motor has three power wires and the speed control has three power wire.
The speed control moves the magnetic field around the motor pulling the armature around.
There are no electrical contacts to wear out.
The speed controller also will change the direction of the magnetic field which reverse the motor direction.
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I sure hope someone comes and explains this better.
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Length of throw on the servo is determined by the servo rotation degrees and then the length of the servo horn.
The control arm length on the control surface (rudder) with the rotation of the servo (60 degrees x 2 gives 30 degrees at the servo but using the horn and the control horn on the "rudder" can make this more or less in throw.

You have those plastic control horns for the servo.
Each hole is about 1/8" or 3/32" apart.
Moving just one hole can change how much your rudder moves by a lot if the hole at the rudder post is close tot he rudder post.
If the hole is farther away from the rudder post the increase amount will be less.

Try setting up a servo on a test board.
put the control rod in the farthest outside hole on both.
Then operate and mark on you r board how far the rudder moves.

Then move the control rod at the rudder post in one hole and check again.

If you want more throw on your rudder, move the control rod at the servo out one hole or move the control rod in one hole at the rudder post.

Most of the information from several years back said that 30 degree of throw was plenty.
How ever these subs with the rudder in front of the propeller wash are not very effective.
And with all the adjustment on the newer radios, I find that I can put 45 degrees of throw on the rudder. (45 degree from neutral or centered)
If that is too much, I can use the controls on the Tx to reduce the amount of rotation full stick sends to the servo.

Farlan, your statement of moving the control rod out one hole at the serve is correct.

[salmon]

Everyone is correct in regards to which hole gets you more throw. On the servo, the further out will result in more throw. On the rudder, the closer you get to the rudder shaft, the more throw you get. Bottom line you have two areas that you can adjust!

[bob_eissler]

Think of a brushless motor as an AC motor where the electronic speed controller generates the frequency for rotation instead of your household current (60hz) or 3 phase at a commercial building.