LiL Richy

Heres what im trying to do:

1. When i press up - Both motors go
2. When i press right - One motor goes and one stops
3. When i press left - One motor goes and one stops

I have:

2: 21x1 motors
1: 15t esc
1: 3 channel radio - http://www2.towerhobbies.com/cgi-bin...=HRCJ16**&P=PU

Can i do it? If not what do i need?

ob nut

My Feedback: (1)

Two ESC's. Each on their own channel. BTW, believe that radio is for AIR, not SURFACE.

Umi_Ryuzuki

I have heard of some people using and aircraft "V-tail mixer" to accomplish what you are describing.

Otherwise, you need a speed control for each motor.

ryan_t888

You would need 2 ESC's and some sort of mixer. What is the purpose of this setup? It's not that efficient.

Ryan

-Inverted-

What you need is the radio off a cheapo RC hovercraft.

straty

nqd boats use that setup i believe they call it push vector or vector thrust

Auslide

Yes I also Seek the Info For this as the NQD Atlantio Starts Smoking Badly and I want to Keep the Differential Thrust but Get an ESC and Reciever that wont Smoke !!

What Kind of ESC will I need ?? Two 50 Amp Jobbies?

The Motors are fine, so I want to keep the Existing Motor and Prop Set up just find an ESC/ Reciever set up that will work ..

LiL Richy

I have a nqd boat and i ripped out all the electronics, because they broke. Im pretty much trying to make my nqd work again.

LiL Richy

I know its for air but its the only one i got.

And does anyone know exactly how to do what im trying to do?

EDIT: Could i with 1 esc hook up 2 motors and 2 batteries and have a servo turn the rutter?
Is it posible?

ryan_t888

Yes you may hook two motors to one ESC, brushed only. Although you must have an ESC that can handle twice the curent of one motor. This is assuming you wire them in parallel.

Ryan

Umi_Ryuzuki

But because it a "differential steered" boat, he has to have two speed controls to be able to turn the boat.

I an not sure what the reciever looks like in an NQD, but can you even plug new ESC, or Servos into the reciever? Seems like it would be proprietary.

I wouldn't use an Aircraft Radio in the boat, if you crash someones airplane, they will be angry and sad. And it is illegal to use anything but ground frequencies in boats and cars.

ryan_t888

He said all the electronics do not work from the NQD. And since he wants to get rid of the differential steering, he can use one ESC on two motors and a servo on a rudder.

Ryan

Auslide

Wiring Diagram to Acheive this from the ESC to Both Motors??

ryan_t888

Stole this Parallel Wiring Diagram diagram from another post:

EDIT: Just realized you are the same guy who asked in another thread

Ryan

Umi_Ryuzuki

There is definitly some confusion going on here.
Seems that I read,

Richy does not mention a rudder. This indicates differential steering with no rudder.
My first post about the Vtail mixer would still require two ESC. So I was confused there.

Since he is dumping the stock electronics for aftermarket parts, he can do either:
Two ESC for differntial steering like the stock model. (which his first post seems to indicate)
OR
Run two motors in parallel off of one esc and add a rudder for steering.
OR
Modify the boat to run on one motor, one esc and add a rudder for steering.

If he uses the parallel wiring diagrams this will run both motors off of one speed control, but will not steer the boat without a rudder.

[edit]
see magnat is also running a similar post, and so is SJN
http://www.rcuniverse.com/forum/m_4306251/tm.htm
http://www.multimodetech.com/index.p...&id=1&Itemid=2

ryan_t888

Richy does mention using a rudder and this would indicate steering with a rudder.

Ryan

Umi_Ryuzuki

Okay, Use a rudder then I much prefer rudders rather than differntial steering.
[&:]

LiL Richy

How do i connect 2 batteries to one esc? Does the esc have to handle 12cells if im using 2 6 cell batteries?

ryan_t888

If you were to wire the batteries in series, yes ESC must be able to handle 12 cells along with the load of the specific motor you are using.

If you wire them in parallel, you will notice increased runtime but voltage is not added.

To do this buy the specific connectors you need and then wire them accordingly.

Ryan

LiL Richy

Heres the new idea:

Im am putting 2 motors on a servo turning the rudder. When i put the trottle on i want both motors to go, when i turn i want the servo to turn.

What are my options?

ryan_t888

I don't quite understand this.

One ESC that can handle the current of both/combined motors.(wired in parallel)

One ESC that can handle the current of 1 motor. (wired in series)

In both cases the servo is independent of these options.

How do you wish to connect the batteries if using 2?

Ryan

LtDoc

LiL Richy,
The way you stated the last post is confusing. I have no idea what you mean by putting 2 motors on one servo, unless 'servo' should have been 'ESC'. If that's correct, then the most common method is by using at least a two channel radio. One channel is used to control the motors through the ESC, the second channel is for rudder control.
About the batteries. If the motors and ESC are all capable of using 14.4 volts then the batteries can be wired in series. Usually mean fairly high speed with a shorter running time. If the motors and ESC are only capable of handling 7.2 volts then the batteries should be wired in parallel. (Each cell is 1.2 volts so a 6 cell pack would be 7.2 volts.) As stated before, batteries in parallel usually mean longer running times at reduces speed when compared to series battery packs. How the batteries are wired depends entirely on motor and ESC capabilities and what your objective is.
From what you said in your first post about the radio, I seriously doubt if it could be used after modifying your boat. It does not sound like the 'normal' R/C radio systems, more like for one of the "toy" boats (meaning no adjustment to speed, either full on or full stop). Changing to one of the typical R/C radio systems makes more control available, but at a larger expense than you might be counting on...
- 'Doc

LiL Richy

\

Im sorry i ment, "I am putting 2 motors AND a servo turning the rudder."

LiL Richy

So to make this clear, what do i need in esc wise? Like i know need a esc that go handle 12 cells to run two 6 cell packs, but what does it have to have to run two 20 turn motors? This is the motors im going to use: http://www2.towerhobbies.com/cgi-bin...&I=LXAMC2&P=ML Im only using these because i have them and i want to test the speed.

LtDoc

LiL Richy,
I have no idea what the current draw of the motors would be. The best way of finding that out is to do a 'stall' test, then you'll know what ~your~ two motors will actually require. Then, you'll know the maximum voltage and current requirements and can select an ESC that will handle it. It's always better to have an ESC a little bit 'too much' than one that's not quite enough. Nothing wrong with 'pushing' things a bit, but the electronics just isn't the place to do it.
Your explanation of what the other post meant clears things up for me! It's also the 'normal' or 'usual' set up for boats with a rudder, and should work just fine. Any typical two channel radio system should work. (Cheap is good, especially for an 'experimental' type thingy.)

One thing that will definitely be different about changing from differential motor control (vectored thrust) to rudder type steering is that steering is going to be very 'touchy', especially at high speeds! Be prepared for that. Certainly not impossible, just different. Thinking 'ahead' of the boat is going to mean a whole new level of concentration... @#$$, if it were easy it wouldn't be any fun!
- 'Doc