Author Topic: Recomendations for radio for twin screw tug  (Read 6095 times)

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tug-arlyn-nelson

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Recomendations for radio for twin screw tug
« on: August 12, 2015, 10:53:11 »
Likely going to go for a twin screw tug for winter project. Having only done 2 single screw tugs with simple 3 ch Futaba radios and only using one servo for steering and one ESC I am having a hard time envisioning a radio that allows for two motors with independent control for each plus steering. I only plan on one servo for steering by connecting the two rudders but how does one go about having rudder control and be able to fwd one motor and rev the other at the same time for twisting as we call it?  Is it best to have an ESC for each motor or just off of one? The main thing I want to be able to do is run the motors independent of the other and be able to have rudder control at the same time. Can you guys recommend a fairly simple not too pricey radio that allows this?   I know this has been covered here in bits and pieces and have seen some useful info but want to narrow it down some.  Thanks!!

fastfaz

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Re: Recomendations for radio for twin screw tug
« Reply #1 on: August 12, 2015, 11:25:26 »
Hi,
    Later this year I am going to be building an MMM Portgarth with twin screw steerable Kort nozzles and after advice I will be using an ESC for each motor (MMM T12's 60mm Korts and propshop 4 blade kort props) and a Planet T5 transmitter which I have had altered so that the left hand stick is now sprung like the right hand one to give tank steering. The guys at "Balne moor mbc" the towing specialists have been very helpful with advice on the build hence the specification above. Re the T5 Howes website does a Tx & Rx for approx. 50 including postage but that is in UK. I have used my other T5 for nearly 2 years now without any problems. Hope this helps.
      Cheers,
           Faz.
The photo is my Lowgarth Mountfleet models but my own design and build (the kit quality and fit was very poor) I scatch built the superstructure from photos of the Foylegarth and scaled it off the figures. Sails superbly.

tug-arlyn-nelson

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Re: Recomendations for radio for twin screw tug
« Reply #2 on: August 12, 2015, 12:36:46 »
Have seen this "tank" steering mentioned a couple of times. What is meant by that? And thanks for the info!

thamestug

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Re: Recomendations for radio for twin screw tug
« Reply #3 on: August 12, 2015, 23:23:27 »
tank steering is individual control of each prop as an army tank has with its tracks.have run my smit nederland with this system for a time now. separate esc for each motor. planet tx and rx with one motor on left stick and other motor and rudder on right stick. if you go on action electronics site ( see side margin) or same via component shop there were wiring diagrams for this setup. scroll down diagrams page to 'tank steering'
« Last Edit: August 12, 2015, 23:38:09 by thamestug »
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tug-arlyn-nelson

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Re: Recomendations for radio for twin screw tug
« Reply #4 on: August 13, 2015, 07:33:30 »
Thanks thamestug!  That is what I was talking about when I said twisting. When I worked on the tugs we called it twist left or right. I cannot see how one would have two props on the model but not have the ability to twist. I will check out the info. Thanks again!

tug-arlyn-nelson

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Re: Recomendations for radio for twin screw tug
« Reply #5 on: August 13, 2015, 17:20:19 »
I have seen several references to the Planet radio TX's. Is there something different about them, or are they particularly appropriate for boats or what exactly?  Is there a certain number like 5 that is best for some reason?  I am totally ignorant of these matters having only built two RC boats and I used the same 3 ch Futaba for each and its a trigger model with a steering wheel for steering. Kinda hokey but works, though I admit to not always turning properly depending on what direction my boats are headed, LOL.  With my next build I will stepping up a bit in complications I suspect.

Would any brand TX work with the tank steering method described there as long as it had dual axis toggles?
« Last Edit: August 13, 2015, 20:07:26 by tug-arlyn-nelson »

Calimero

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Re: Recomendations for radio for twin screw tug
« Reply #6 on: August 18, 2015, 01:52:39 »
I'd go with a Taranis+ these days.

Well if setting the time on your microwave is a nightmare for you, it might not be for you as it takes some involvement (watching a few youtube tutorials) to get the hang of it.
But it offers tremendous flexibility compared to most radios that are geared towards planes and helis.

If you choose to get a programmable radio (one that offers toggleable mixes and dual rates), I'd go with two independent rudder servos. Through basic mixing you can actually have them work together from a single stick or work as independent rudders.

I'm using a DX7s (but I find it frustrating, that's why I'm moving to a Taranis). With a mix and dual rate you can go from full independent control (ie: each stick control the rudder and ESC for one side) to "basic mode" (ie: left stick controls both ESCs while right stick control both rudders).
You should be able to do the same on a Planet I assume.

tug-arlyn-nelson

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Re: Recomendations for radio for twin screw tug
« Reply #7 on: August 18, 2015, 07:58:14 »
Never heard of Taranis!  Been looking at lots of radios too.  Thanks for the info guys.

Calimero

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Re: Recomendations for radio for twin screw tug
« Reply #8 on: August 18, 2015, 08:53:26 »
The Taranis was built by FrSky specifically to run OpenTX (and was developed in close cooperation with OpenTX' developers).

Inputs and channels can be changed on the fly. Let's say you have a working crane on your tug: flick a switch and now the sticks control the crane instead of the screws/rudders. And so on.

tug-arlyn-nelson

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Re: Recomendations for radio for twin screw tug
« Reply #9 on: October 19, 2015, 20:50:16 »
So with two motors, a left and right hand prop;  since the motors are not left or right turning, but both the same, does one just flip the reverse switch on the TX on one side or wire one motor opposite the other?  Seems like flipping the TX switch is the way to go?

des

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Re: Recomendations for radio for twin screw tug
« Reply #10 on: October 20, 2015, 14:37:43 »
No - wiring one motor "backwards" is the correct way to do it.  But you won't know which one to swap over until you do your first radio trials in the bath - then you'll likely find that you will need to reverse both motors (Murphy's Law).  For forward motion you should end up with both motors running in opposite directions.  Check out the wiring diagrams on the ACTion Electronics website, accessible from a link on this tug forum site.

Des.

tug-arlyn-nelson

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Re: Recomendations for radio for twin screw tug
« Reply #11 on: October 20, 2015, 14:56:12 »
Thanks Des!  Will do.

des

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Re: Recomendations for radio for twin screw tug
« Reply #12 on: October 21, 2015, 15:49:19 »
Looking back through this thread I found the earlier reference to tank steering, or twisting.

You don't need two separate ESCs to accomplish this, or even twin-throttle control - ACTion Electronics have a twin-ESC / mixer module (P94 I think, but may be P95) which will do this, working off either one or two throttle control sticks.  But if you find you don't like it, you can change to single throttle control (still with twisting) at the flip of a switch - no hardware changes, no wiring changes.

Check it out on their website.

Des.

FLJ

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Re: Recomendations for radio for twin screw tug
« Reply #13 on: November 09, 2015, 06:46:33 »
Here's a thing I wrote a long time ago now. It's all still good stuff, though. http://www.action-electronics.co.uk/pdfs/Twins%20Ver2.pdf
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mike_victoriabc

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Re: Recomendations for radio for twin screw tug
« Reply #14 on: November 09, 2015, 07:20:16 »
Thanks for reminding us where this info is hidden. Always helpful.