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DelTang 2.4GHz receivers - pt.I
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 Posted: Thu Oct 4th, 2012 12:12 pm
   
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Bernd
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David,

Since I haven't got around to buying a decoder yet I've decided on an engineering change. I'd like to go R/C with the crane.

So what I need will be a Rx43d-x-v5, DSM2 Tx and a Lipo battery, correct? The motors are rated for between 4.8 for the winch motors and 6 for the swing motor on the turret. Waht size Lipo would you recomend?

Check your PM. More questions.

Bernd

 



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 Posted: Thu Oct 4th, 2012 02:59 pm
   
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DavidT
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Bernd,
I'd go with 500mAh or more depending on space and whether you can swop it out. Sven in Germany has made something similar using Rx43d-3. Judging by proportions relative to the receiver in a photo in post 39 of this thread http://78514.homepagemodules.de/t3226f8-Liebherr-MAX-Wild-quot-Abbruch-quot.html it looks like he's using a 300mAh or thereabouts. I doubt if he 'drives' as much as as a train might. So if you are also intending to power the loco I'd add on a bit more. There is no exact answer because we don't know how much current you will draw.

Lipos usually have a 'C' rating. A 10C 500mAh lipo can deliver a theoretical 5A but half that is more reasonable. Clearly you don't need high C ratings so I'd buy the cheapest you can find.

It's normal to charge at 1C. So thats 500mA for a 500mAh lipo. You want a charger that allows you to change the charge current usually in 0.1A steps. Charging at 1C normally takes about 90 minutes because the charge current reduces as the cell fills up. Most chargers run off 12v. Some have mains power as well.
Regards, David.

Last edited on Thu Oct 4th, 2012 03:04 pm by DavidT

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 Posted: Thu Oct 4th, 2012 04:39 pm
   
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Bernd
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David,

all sounds very good. I'm going to go ahead and R/C the crane. Won't need more than 3 channels for now.

I'll check on the current draw of the motors I'm using currently.

Many thanks for answering my many questions.

Bernd



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 Posted: Sun Oct 7th, 2012 03:02 am
   
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Rod Hutchinson
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Bernard,
Hi all,

I have been following this thread with interest. I model in HOn30 and the issue of power pick-up is exacerbated the physical size of components in the smaller scales.

I have wondered if anyone has some success with tiny locos using ESC's?



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 Posted: Sun Oct 7th, 2012 07:48 am
   
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DavidT
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Rod. Here's a video of my N gauge Minitrix on 103mm Tomix track. I think most proportional ESCs should work fine if you can fit them in.
http://youtu.be/Vfs-oEVMjek

Last edited on Sun Oct 7th, 2012 11:00 am by DavidT

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 Posted: Sun Oct 7th, 2012 11:22 am
   
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Herb Kephart
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Excellent!

Shows how EVEN N scale locos can be made to creep along without worrying about track pickup.

And both Woodie and I abhor systems that require push buttons to control things--sticks (or slide "switches") are the only way to go.


I'm Herb, and I approved this message! 




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 Posted: Sun Oct 7th, 2012 01:25 pm
   
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mwiz64
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That's wonderful stuff, there David. That sir, is the future of model railroading, in my humble opinion. Why anyone would want to do all that wireing in this day and age, is beyond me. Next step, get an RC system like that to operate sound.

One question, how long will that little guy run before having to recharge?

Mike



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 Posted: Sun Oct 7th, 2012 01:29 pm
   
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mwiz64
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Oh, in my opinion the best little connectors are Deans Micro connectors.

http://www.amainhobbies.com/product_info.php/cPath/1389_226/products_id/3592/n/Deans-Micro-Plug-2R-Red-Polarized-Connector

JST connectors are good too and they require no soldering, just crimp on the pins. At Hanson Hobbies they sell them unassembled and they sell the crimp tool too... They even have a nice video about how to properly crimp on their home page.

http://www.hansenhobbies.com/products/connectors/miscconnectors/

Mike

Last edited on Sun Oct 7th, 2012 01:50 pm by mwiz64



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 Posted: Sun Oct 7th, 2012 05:23 pm
   
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Bernd
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David,

Back from 3 days away from the computer. I had a chance to do at bit more thinking on this. I'm really starting to like this idea of R/C battery powered trains and am going to pursue some ideas.

Now I have another question. Can one transmitter control more that one receiver? The American modeler likes to consist his engines, in other words run two or more powered engines on his train. Could one receiver control the speed of say a 3 engine lash-up? Or can you only control one engine (motor) at a time? You'll have to remember also that the typical modeler will want to use different engines at times also. So each engine would need it's own receiver.


I also did a little research on the Lipo batteries. I'm a little scared with what can happen to them. Until I feel more comfortable using them I'd like to use the Nicad's. Which gave me another idea. Since these will need charging from time to time. I think one could have a constant 12 volt source on the track and then have an on-board charger to keep the batteries charged up. What do you think?

Bernd



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A PESSIMIST sees a dark tunnel
An OPTIMIST sees light at the end of the tunnel
A REALIST sees a freight train
The LOCOMOTIVE ENGINEER sees three idiots standing on the tracks
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 Posted: Sun Oct 7th, 2012 05:24 pm
   
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DavidT
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Thanks Herb and Mike. I was pleased with how it came together. I'll do a run time test for you Mike.

I agree that the micro Deans are very high quality but they are a little difficult to use in confined spaces. I use the red JST connectors a lot in applications drawing up to about 8A. Small lipos often come with them fitted so they are very popular.

For lower currents the connector that has become ubiquitous for planes using 1S lipos is the 1.25mm Molex Picoblade http://www.hansenhobbies.com/products/connectors/125mm/125mm_1x2/ Lots of small 1S packs come with them firmly attached. HK have compatible extension leads which I cut in half; much easier than soldering my own! http://www.hobbyking.com/hobbyking/store/__9727__Mini_Plug_Extention_for_Micro_Battery_10cm_5pcs_bag_.html

Regards, David.

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