cowana

This is about my RNLI offshore 1/20 Lifeboat I am working on.

It will have 2 700 motors with 2 props. It is a scale model, with lights, fittings and smoke.

It will all run off a 12V 7Ah Lead acid battery.

Previously I was looking at using servos, resistors and switches to slow one motor when cornering.


My LHS had a Navy 600 for sale cheaply, so I got that.

Although it doesn't have reverse, can I still use it with that setup?

ESCs on ch 1 and 2.
Rudder on 4, with a mix.

My original idea was to have the smoke generator controlled by a servo+switch on channel 5.

I would then have an ESC controlling a pump, pumping smoke fluid to the smoke genarator.

I wanted to use the PMix to mix channel 6 (the dial for the ESC), to the throttle, so as well as controlling the smoke through a dial, it would match the throttle.

However, This may not work, as I don't know how it works out if it should use the setting of the dial, or the setting of the (mixed) throttle. Also, I would need the Pmix for the rudder.

If this would be an issue, I could just use a Y cable connecting the smoke to the throttle.

The NEW problem comes if I mix 1 and 2 for the throttle, as neither would reflect the throttle stick fully when turning, although this doesn't really matter.

Also, what happens about reverse, as I one ESC will have reverse and one doesn't? Will that make it go in circles, or could I counteract that with the rudder?

I don't want to have to buy a bow thruster now.

cowana

Ghost in the shell

its probably better to get a pair of overlander 50s, you may get problems with a forward only esc, having a farward only esc not recomended unless you are racing!!!!

cowana

I want to get that one, becasue as well as being able to cope with loads of volts, I do also make fast boats.

mfr02

Not quite sure about the logic here. Most smoke generators I have seen dont regulate the smoke by pumping fluid, but by heating the fluid and moving the vapour using a fan. Effectively the element is an oil cooled heating element, and may not react well to being run dry - also regulating the very small amount of oil required could be a problem.

cowana

I have the graupner 12V one - and according to the instructions, there are two ways of running it.

The first, is having the smoke fluid bottle above the level of the heater, so gravity makes the fluid go into the heater.

The other is pumping it into the heater, and having the smoke fluid below the level of the pump.

The heater produces a strong jet, so would not need fanning out of the back.

I have run the heater dry before, but it would not run dry much in this application, as it would still be on at idle.

Andrew

LtDoc

The lack of reverse isn't a biggy. A switching arrangement can be made to change to reverse. Not exactly the least complicated thing in the world to do, but certainly possible. Basically, it would swap the motor leads to the 'other' poles, switch them around. Depending on the current requirements, that's gonna be a couple of big switches! Probably another control channel for the radio too.
Be careful about doing the same polarity switching with a smoke producer! If you switch polarity on most of them it sucks smoke out of the air and changes it back to oil...
- 'Doc

[I think I've had enough coffee, and besides, it's time I get to work. I'm in the right frame of mind for that!]

cowana

I'll watch for that, or put in a diode. The ESC I want to use for the smoke has got reverse.

Is it only possible to set up one programmable mix with the futaba 6EXA?

Is it possible to switch a [link=http://www.maplin.co.uk/module.aspx?ModuleNo=2360&doy=16m9]toggle switch[/link] with a servo somehow?

Thanks,

Andrew

Ghost in the shell

is this any good?

http://manuals.hobbico.com/fut/6exa-manual-v1_1.pdf

Umi_Ryuzuki

I often operate five switches with a servo...

Ghost in the shell

umi can you put a vid of that thing working please

Umi_Ryuzuki

Buy me a new camera...

That one works on a proportional channel. Each switch is momentary, and will operate a function as the cam hits and holds the button on. When the lights come on, stop moving the slider.