Topic: Help please - speed controllers.. (Read 16791 times)

Coxn John · « **Reply #25 on:** February 16, 2015, 07:41:29 pm »

Its not supposed to be fast, the real boat only managed 9 knots

Time Bandit · « **Reply #26 on:** February 16, 2015, 07:52:06 pm »

I thought it would be half gliding at around 20 knots

The motors are even more wrong with a displacing hull.
You should get motors which make 3000 1/min max at 6V.
Something like this should work perfectly
http://www.componentshop.co.uk/mabuchi-555-dc-motor.html

Or you try motors with "better quality" like Buehler or coreless (Faulhaber...)

Coxn John · « **Reply #27 on:** February 16, 2015, 07:55:26 pm »

Thanks Tobias, i'll certainly explore your link

Coxn John · « **Reply #28 on:** February 16, 2015, 07:59:50 pm »

Tobias, are you saying buy these 12volt motors but run them on 6volt ?

Time Bandit · « **Reply #29 on:** February 16, 2015, 09:30:03 pm »

Yep, why not?
Rpm looks good on 6V.

Coxn John · « **Reply #30 on:** February 16, 2015, 09:31:29 pm »

Ok, just wanted to check, sounds like a win win idea to me :)

Coxn John · « **Reply #31 on:** February 16, 2015, 09:39:42 pm »

Right, iv ordered those

Now tell me which ESC (inc BEC) you would use on this set-up please Tobias ?

Coxn John · « **Reply #32 on:** February 16, 2015, 09:40:21 pm »

I should say ESCs cos i'd need 2

Time Bandit · « **Reply #33 on:** February 16, 2015, 10:10:46 pm »

Well I don't know your suppliers in the UK so well.
But these motors will probably draw less than 3-4A depending on the weight of your boat.
So everything above 10A rating should be fine.

If you are open to order in germany I'd use those here
Www.modellbauregler.de
http://www.modellbau-regler.de/shop/product_info.php?products_id=90
These are the best ESC I know, since their PWM frequency is above what you can hear.

Coxn John · « **Reply #34 on:** February 16, 2015, 10:21:46 pm »

Boat weighs about 15 pounds (prob about 8kg).
Im not unwilling to order from abroad but don't speak german so a language difficulty, but my g/f will know how to google translate it, as long as they will post to UK ?

malcolmfrary · « **Reply #35 on:** February 17, 2015, 09:25:45 am »

Mtronic Marine Viper 15 is fairly universally available, easy to set up, not overly expensive, compact and reliable. Just the usual caveat that when using more than one, the red wire of the servo lead should be disconnected on one of them. They do run in the audible range, personally I don't mind that - it lets me know that something should be happening.

inertia · « **Reply #36 on:** February 17, 2015, 09:37:29 am »

One of the very best ESCs on the market IMHO http://www.microgyros.com/
Mike prefers a telephone call to an E-Mail.
DM

Time Bandit · « **Reply #37 on:** February 17, 2015, 09:54:34 am »

Quote from: Coxn John on February 16, 2015, 10:21:46 pm

Boat weighs about 15 pounds (prob about 8kg).
Im not unwilling to order from abroad but don't speak german so a language difficulty, but my g/f will know how to google translate it, as long as they will post to UK ?

@8kg you can count with around 20-25W to bring the boat to hull speed, so probably 3A per Motor.

I´m sure that Michael from modellbauregler.de will speak english and probably also post to UK.
If you need a translation to german just send me a PM.

Coxn John · « **Reply #38 on:** February 17, 2015, 02:57:26 pm »

malcolmfrary, Not sure what you mean by 'disconnect servo lead' Why ? How will it get its independent control ? Does this apply to ALL makes of ESC ?

mrturbo553 · « **Reply #39 on:** February 17, 2015, 03:55:35 pm »

Coxn John , all Malcolm was explaining was , remove one red wire from one of your two speed controllers.
http://www.mtroniks.net/download.asp?ResourceID=1945

The above link may help you understand a little better . I use the fr40 micro gyro speedos as suggested above , and also various other Acton products ( good on yer DM

)
Aid

Coxn John · « **Reply #40 on:** February 17, 2015, 03:59:20 pm »

Thanks Aid

jarvo · « **Reply #41 on:** February 17, 2015, 04:03:24 pm »

Hi John

Disconecting one red wire is needed so that you dont get 2 BEC feeds to the reciever, dont cut the wire just release the tag on the plug and withdraw it from the plastic holder.

Mark

Netleyned · « **Reply #42 on:** February 17, 2015, 04:06:15 pm »

Quote from: jarvo on February 17, 2015, 04:03:24 pm

Hi John

Disconecting one red wire is needed so that you dont get 2 BEC feeds to the reciever, dont cut the wire just release the tag on the plug and withdraw it from the plastic holder.

Mark

And tape it back along the servo lead so it is insulated

Ned

inertia · « **Reply #43 on:** February 17, 2015, 04:41:39 pm »

A picture is worth a thousand words - as long as they're very cheap words...........
( Disabling Battery Eliminator Circuit BEC / ESC)

Coxn John · « **Reply #44 on:** February 17, 2015, 04:43:37 pm »

Thanks Inertia, that's good

jarvo · « **Reply #45 on:** February 17, 2015, 06:52:54 pm »

Inertia

My reply was ok but what is the purpose, IE what does the double red wire cause????

Mark

malcolmfrary · « **Reply #46 on:** February 17, 2015, 07:04:18 pm »

Quote from: jarvo on February 17, 2015, 06:52:54 pm

Inertia

My reply was ok but what is the purpose, IE what does the double red wire cause????

Mark

The BEC is there to supply a stable voltage to the system. Due to manufacturing tolerances, each one is likely to be a few minute fractions of a volt different to all the others. Each will "see" the others voltage and try to regulate it. Even though it might only be a millionth of a volt or so, it can wind up being fatal to one of them. Since the regulated voltage only appears on the red wire, that is the one to disconnect on ONE of the ESCs. The ESC with the disconnected wire still works because it has its own BEC to work its own electronics.

jarvo · « **Reply #47 on:** February 17, 2015, 07:10:50 pm »

So now i know!!!!!

Thanks for keeping it simple(like me)

Regards

Mark

Coxn John · « **Reply #48 on:** March 12, 2015, 03:23:55 pm »

UPDATE -
This post taught me a lot about electronics & their tricks, a BIG THANKYOU to all you guys who participated, especially Tobias

The Lifeboat is now working (yet to try on water but I don't forsee a problem as the props appear to be spinning fast enough).
What Iv ended up with is Mabuchi 12volt motors (555) running on 6volt power, ESCs from Modelbauregler in Germany, & each one fitted with its own 15amp blade type fuse.
Thanks again guys

Coxn John · « **Reply #49 on:** March 18, 2015, 06:54:27 pm »

Full test on our lake carried out today, excellent result, & more controllable than before

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Author Topic: Help please - speed controllers.. (Read 16791 times)

inertia

inertia