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>> Home > Forum > Electrical Related > correct size of wiring
correct size of wiring
(310 views)
Author Message
octman
(Captain)





Forum Posts: 99
8th Aug 2017 14:30  
>> Permalink
mdlbt.com/31821

I apologise if this has already been covered here but I am now at the point of installing the motor in my new model. The motor is a Graupner speed 600, and the specs are :
Nominal voltage 8.4 V
Operating voltage range 4.8-9,6 V
No-load rpm 15500
No-load current drain 1.8 A
Current drain at max. efficiency 11 A
Current drain when stalled 70 A
Max. efficiency without gearbox 75 %

If I use 8.4 volts what size wiring do I need? Do I need to cater for the 70A current or the 11A current, or somewhere in between, with a fuse?
Sorry to be a bit dim on this but I am confused (with most things these days!)

Chris

RNinMunich
(Fleet Admiral!)





Forum Posts: 1087
8th Aug 2017 14:45  
>> Permalink
mdlbt.com/31825

Hi Chris, no you don't need 70A wire! 😊 That might be horribly thick and stiff for a scale boat.
You need wire the same size as probably on both your motor and battery. Same the 'standard' wiring in cars. Available I suppose at Halfords and any car diy shop.
WHAT YOU DO NEED IS A 15 OR 20 Amp FUSE TO PROTECT THE WIRING IF THE MOTOR STALLS (PROP GETS BLOCKED) 😡
If your ESC has a BEC supply for the RX put the fuse in the positive motor lead, probably red or yellow. If not, i.e. you have a separate battery supply, put the fuse in the positive lead from drive battery to ESC.
Then at least the RX will still work and maybe you can see from shore if it still responds; e.g. by switching on lights or some other visible function.
With twin or more props fusing the motor wire itself can sometimes help get the boat home on a remaining engine.
Somewhere in the Electrical stuff blog is a long discussion on the subject!
Have a look here
https://model-boats.com/forum/electrical-related/28332
"What type of wire?"
Happy sailing 👍 Cheers Doug 😎
PS: Almost forgot, if you have a brushless motor you have no choice but to put the fuse in the positive wire from battery to ESC! Brushless ain't got no positive!


"The brain is not intended to store facts. It is for thinking, and for knowing where to find the facts !" Albert Einstein. 😉 cheers Doug
NPJ
(Captain)





Forum Posts: 62
16th Oct 2017 10:23  
>> Permalink
mdlbt.com/34541

Doug.

What thickness of wire for the transponders/exciters please?

NPJ


NPJ
RNinMunich
(Fleet Admiral!)





Forum Posts: 1087
16th Oct 2017 11:52  
>> Permalink
mdlbt.com/34545

Hi Neil,
I noticed that you've had a look at the extensive Electrical Blogs about wire thicknesses from a month or so back, so maybe you found the answer, if not-
Use flexible multi-strand wire with a cross section area of about 0.75 mm².
Don't get the +s and -s of the exciters mixed up or they will work 180° out of phase and dampen the volume.

BTW: the exciters are not transponders! Transponders are devices which respond to a particular input signal by sending a signal back. Such as the transponders in aircraft; they respond to secondary radar signals by sending back their ID and location, height etc. Or ship's SAR beacons which respond to a 9GHz search radar by sending back ID and location coordinates. The exciters are actually transducers which take an input signal in one form and convert into an output signal of a different form; e.g. here electrical to mechanical! Here endeth the lecture for today! 😉
Happy modding, Doug 😎


"The brain is not intended to store facts. It is for thinking, and for knowing where to find the facts !" Albert Einstein. 😉 cheers Doug
NPJ
(Captain)





Forum Posts: 62
16th Oct 2017 14:33  
>> Permalink
mdlbt.com/34554

Yes me not being properly awake............it was transducers that I intended to write...............

Thanks for the info. I hope to run a test on the sound setup before going away.

Behind now due to weather, but trying to catch up.

Which is right thread to ask you about the ESC/Mixer set up?

Very glad you chaps are there.................!

All the best

NPJ


NPJ
Dave M
(Fleet Admiral!)





Forum Posts: 1402
16th Oct 2017 15:18  
>> Permalink
mdlbt.com/34561

Neil
Start a new topic in this electrical related section of the forum


Live long and prosper

Dave
RNinMunich
(Fleet Admiral!)





Forum Posts: 1087
16th Oct 2017 15:21  
>> Permalink
mdlbt.com/34562

Or concentrate everything in the Build/Upgrade blog?


"The brain is not intended to store facts. It is for thinking, and for knowing where to find the facts !" Albert Einstein. 😉 cheers Doug
Dave M
(Fleet Admiral!)





Forum Posts: 1402
16th Oct 2017 15:33  
>> Permalink
mdlbt.com/34566

Neil
If you want to ask a question the Forum is the correct place.
Your build blog is for describing your progress and may not be seen by all members who are not subscribed to your blog.


Live long and prosper

Dave
NPJ
(Captain)





Forum Posts: 62
16th Oct 2017 17:19  
>> Permalink
mdlbt.com/34580

Thanks for that both.

I will check out the list here and if not already present, start a new one.

Sorry to be so slow on the up take.

Cheers.

NPJ


NPJ
RNinMunich
(Fleet Admiral!)





Forum Posts: 1087
16th Oct 2017 17:22  
>> Permalink
mdlbt.com/34581

STOP saying sorry!! 😡
There's no reason to be 👍😉


"The brain is not intended to store facts. It is for thinking, and for knowing where to find the facts !" Albert Einstein. 😉 cheers Doug
NPJ
(Captain)





Forum Posts: 62
17th Oct 2017 11:04  
>> Permalink
mdlbt.com/34625

OK...................No more 'sorry' bit!
Going to start a new Topic re the Esc/Mixer multi controller.

Cheers both.

NPJ


NPJ
NPJ
(Captain)





Forum Posts: 62
18th Oct 2017 15:09  
>> Permalink
mdlbt.com/34712

Took other images and changed colour of light.

Now even I can see the marks Doug!

I expect you all could anyway......................

Thanks both for that.

Hope for a test before we leave on Friday.

Cheers

NPJ


Attached Files - Click To View Large


NPJ