S-100

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S-100

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4 April 2017 at 18:36 #70543
Phil Childs
Participant
@philchilds35947
Hi,

I have been building my S-100 on and off for about four years, i have just had it on the water for the first time and have found an issue with the motors getting very hot, i have been looking at adding some cooling but thought i would see if anyone else has had the problem, i am running three MFA 457RE380 motors with the props recommended by SHG Models based on Dave Abbots build,(i never did get the info out of SHG on prop size) the electronics i have fitted are from Component Shop.co.uk and are;

High Current On/Off Toggle Switch

P102 Power Distribution Board

P94 Lite 10A Dual ESC/Mixer

P79 Condor 10A ESC

P95/1 Single Indicator Fuse Board

P95/2 Twin Indicator Fuse Board

3x MFA 380 Motors

and am running that off a 7.2 S2 lipo.

I have had thought of changing the 380's to brushless but have no idea what ones match the them, so any help would be much appreciated.

I would post some pictures but can't seem to work out how too.

Thanks

Phil

Edited By Phil Childs on 04/04/2017 18:37:24

Edited By Phil Childs on 04/04/2017 18:37:57
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4 April 2017 at 18:36 #2660
Phil Childs
Participant
@philchilds35947
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4 April 2017 at 19:50 #70544
Empire Parkstone
Participant
@empireparkstone
You could try a 7.2 Nimh instead of the 7.4 Lipo bearing in mind fully charged is 8.4 V see if that makes any difference take it it is the Italeri 1/35 scale .Or even consider 3 x 385's. I'm just about venture into brushless with my 1/24 s-100 with just one motor . Think on this if you go brushless you also need an esc for each motor

My 1/35 model runs cool on 2×380 but its just a fairweather sailor
4 April 2017 at 22:56 #70545
Charles Oates
Participant
@charlesoates31738
It sounds like the props are too big or the wrong pitch. We need to know what they are. Don't switch to 385 motors yet, although they look similar, they are a completely different beasts, meant for slowish scale models. The .2 volt difference with NiMH batteries is irrelevant. If the props aren't marked, you can measure them.
5 April 2017 at 09:12 #70546
Dave Milbourn
Participant
@davemilbourn48782
Almost certainly the motors are being overloaded, as Chas says. I would have started with something like 20mm 3-blade fast scale bronze, but why not contact Simon Higgins of Protean Design and have a chat with him? I'll PM you his details if you wish.

Dave M
5 April 2017 at 09:27 #70547
Empire Parkstone
Participant
@empireparkstone
As the OP is using SHG who made the conversion kits the props will be 28mm the only difference from the Magazine conversion is Esc's where a single 20amp is used as opposed to as said I have run mine albeit on 2 380s' no heat

Phil I would go through your Mixer and power board set up instructions with a fine tooth comb making sure you have everything as Action electronics advises something could be clashing
5 April 2017 at 12:15 #70548
Tim Cooper
Participant
@timcooper90034
I have one of the Italeri S100 s to start soon. Looking at the info on the Net I was thinking of using 3 x 385 's but using 9.6 or 12v depending on space or weight. Props of 30 or 35mm. Guess I will have to wait and see if that works .

Tim
5 April 2017 at 13:27 #70549
Phil Childs
Participant
@philchilds35947
Thanks for all your replies, Empire Parkstone, i will go over the set up and see if its as it should be, it did cross my mind it could be something there.

Out of interest how do i measure the props, is it across the prop blade to blade? i would like to confirm whether they are 28mm or not.
5 April 2017 at 13:35 #70550
Phil Childs
Participant
@philchilds35947
I Have managed to get some pictures ;
5 April 2017 at 14:19 #70551
Dave Milbourn
Participant
@davemilbourn48782
Phil

Your installation appears OK. If there was a problem then either something would have blown – e.g. a fuse – or nothing would work at all. Electronics aren't generally "sticky" like prop shafts and couplings can be; they either work or they just sit and sulk. It's entirely possible that I built every ACTion gizmo in your boat myself so I'd like to think that they work properly!

There's no substitute for knowing what's going on when the boat is sailing, so I always recommend fitting a small Wattmeter between the battery and the ESC [in your case between the battery and the PD board]. This will record the maximum current drawn by the system which, for 3 x 380 motors, should be less than 30A in total. This is the one I use – others are available **LINK**

For the prop diameter you need to find out the size of circular hole which will touch each prop tip i.e. just allow the prop to pass through it. You can approximate this by measuring from the centre of the prop boss to the tip of one blade, then multiply by 2.

If you want to go brushless then I'd suggest you start with something like this x 3 **LINK** but bear in mind that all of that ACTion stuff will be redundant and you'll then need 3 x brushless marine ESCs and a 3S or 4S LiPo pack. Three new props would be a helluva lot cheaper.

Dave M

Edited By Dave Milbourn on 05/04/2017 14:20:40
5 April 2017 at 19:25 #70552
Empire Parkstone
Participant
@empireparkstone
Phil scaling your Pic to actual physical size (about 6'' across not maybe that accurate those props are coming out at almost 40mm? did you modify the rudders and confirm it is the Italeri model '
5 April 2017 at 19:30 #70553
Phil Childs
Participant
@philchilds35947
Hi Dave,

I wasn't suggesting there was a problem with the electronics them selves, just that i may have set them up wrong.

I have measured the props and it would appear they are 30mm.
5 April 2017 at 19:36 #70554
Phil Childs
Participant
@philchilds35947
Hi Empire, it is the Italeri 1/35 model, i did a bit of research on the rudders and it seemed the general consensus was to over scale them so i used two of the smallest brass rudders and the second smallest, i have found getting any info from SHG was difficult, but as they do the kit based on Dave Abbots build i just asked for that, but never knew the prop size or pitch.
5 April 2017 at 20:05 #70555
Empire Parkstone
Participant
@empireparkstone
Hi Phil

In that case the props should be the same as mine cant see him giving out bigger ones The rudders I just use the kit ones good enough for me I was not referring to anything wrong with the mixer either but they can be set up wrong . So if its not the prop size ? thinking caps back on. I never had a problem with SHG phoning but he does travel around to shows alot
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