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>> Home > Forum > Boat Specific Chit Chat! > motors
motors
(799 views)
Author Message
pilot
(Petty Officer)





Forum Posts: 7
17th Dec 2017 09:05  
>> Permalink
mdlbt.com/36674

hi i have a wooden huntsman 46 ready for motor my last post gave me some ideas i am looking at hobbyking
turnigy xk3674 1900kv part number 9393000021-0 and
turnigy marine 120a bec waterproof speed controller
part number 9020000033-0 what do we think steve

jarvo
(Fleet Admiral!)





Forum Posts: 523
17th Dec 2017 13:20  
>> Permalink
mdlbt.com/36680

Hi Steve, agree with the motor size and ESC but reduce the KV down to about 1000 ish more torque and a cooler motor

Mark


Etherow Model Boat Club
ChrisF
(Sub-Lieutenant)





Forum Posts: 29
17th Dec 2017 18:33  
>> Permalink
mdlbt.com/36691

The 46" Huntsman is a big old beast and I'd be looking at something different.

You want good speed but not manic.
The one you mention is an inrunner brushless which doesn't have as much torque size for size as an outrunner.

If it was me (and it will be at some stage as I have a 46" Huntsman with an MFA 850 brushed motor in it) I'd be looking for a 50 diameter outrunner around 700kv which will give plenty of torque.

There is a Turnigy just under that which might do.

I'm building a 33" Swordsman and am fitting an Overlander Tornado Thumper V3 4250/06 800kv outrunner. It is probably a little oversize but my thinking is that the motor will have an easy time, run cooler and the battery (4S) will last longer. If it is too fast I'll limit the throttle. Better to be too big than too small in my book.

Overlander do a 5045/10 720kw which should be good on 4S which could always be increased to 6S if necessary.

See what others say though.

Chris


Concentrating on the fine Fairey Marine boats
pilot
(Petty Officer)





Forum Posts: 7
17th Dec 2017 20:08  
>> Permalink
mdlbt.com/36692

hi chris what do you think turnigy aqastar 4084-620kv hobbyking
9192000092 thanks steve

ChrisF
(Sub-Lieutenant)





Forum Posts: 29
17th Dec 2017 20:25  
>> Permalink
mdlbt.com/36693

Initial thought was again that it was still a little small.

But I see that one of the reviewers uses one in a 48" boat using 6S and is happy with it.


Concentrating on the fine Fairey Marine boats
jarvo
(Fleet Admiral!)





Forum Posts: 523
17th Dec 2017 23:40  
>> Permalink
mdlbt.com/36695

HI Steve, I would go to something like a 45 or 50mm with about 800 / 1000 kv this would enable you to go from 4s - 6s with a great turn of speed if needed
Have a look at AIRTEC, they are a UK (Yorkshire) based model shop and have a good range of their own motors

Mark


Etherow Model Boat Club
pilot
(Petty Officer)





Forum Posts: 7
18th Dec 2017 03:58  
>> Permalink
mdlbt.com/36697

hi when you say a little small in yhe hobbyking range what would you use steve

canabus
(Admiral)





Forum Posts: 78
18th Dec 2017 08:49  
>> Permalink
mdlbt.com/36700

Hi pilot
ChrisF is about right with the overland, but, if it's Hobbyking stuff.
A Turnigy L5055C-700kv 1600watts on 4 to 6S with a 100Amp ESC which will handle up to 6S.
I am starting with a 2blade 52mm CNC prop(377000019) on 4S.
The 3674 1900kv is more for a high speed race boat.
Canabus

ChrisF
(Sub-Lieutenant)





Forum Posts: 29
18th Dec 2017 13:22  
>> Permalink
mdlbt.com/36706

As Canabus suggests. I missed that one when I was looking - the one I saw was the 5045 660v.

Either would do the job but the higher kv one would be a little better.

Again as Canabus says the smaller high kv motors (well over 1000kv and therefore high revs) are more suitable for light very fast craft.

Chris


Concentrating on the fine Fairey Marine boats
Ron
(Fleet Admiral!)





Forum Posts: 89
19th Dec 2017 13:59  
>> Permalink
mdlbt.com/36720

https://hobbyking.com/en_us/turnigy-xk3665-1200kv-sensorless...

Is this the better motor to use? If so, why?

I use brushed motors, but wish to know about brushless.

ChrisF
(Sub-Lieutenant)





Forum Posts: 29
19th Dec 2017 18:30  
>> Permalink
mdlbt.com/36721

No, that's less powerful than in Pilot's opening post and like his suggestion is an inrunner motor. The consensus is that a 50 mm diameter outrunner ( the first part of the model No.) is what is required for a big boat like the Huntsman. The second part of the No. is the length of the motor.

That size plus a kv figure of around 700 to 1000 will provide plenty of torque to get it moving and high enough revs to get it on the plane.

Once you start getting a kv figure well over 1000 you start to get into higher revs which is useful for smaller batteries (e.g. 1000kv x 7.4v = 7400 rpm) which as said is good for fairly small, light, sports and race type boats.

Conversely if you have quite a big displacement boat then you want quite a big motor but with a low kv figure as you don't generally want to tear along but want torque!

Chris


Concentrating on the fine Fairey Marine boats
pilot
(Petty Officer)





Forum Posts: 7
20th Dec 2017 08:13  
>> Permalink
mdlbt.com/36751

hi just looking at some off my electric motors from my rc gliders
and found a dymond gtx-4356v2/600kv outrunner.
could i use this on my huntsman 31 if i can how would i cool it
need to get this sorted

jarvo
(Fleet Admiral!)





Forum Posts: 523
20th Dec 2017 08:28  
>> Permalink
mdlbt.com/36753

Pilot, yes i think that would work, as for cooling, add a fan to the rear motor shaft, this would suck/blow through the motor, just make sure you have large enough vents for the air to circulate
Mark


Etherow Model Boat Club
pilot
(Petty Officer)





Forum Posts: 7
22nd Dec 2017 04:35  
>> Permalink
mdlbt.com/36810

hi last ditch effort before i take up knitting recap presedent huntsman 46 inch wooden kit hobbyking turnigy aquastar 408
4-1050kv water cooled brushless 160a water cooled esc thank you all for your help steve

Bryan-the-pirate
(Lieutenant)





Forum Posts: 17
22nd Dec 2017 12:53  
>> Permalink
mdlbt.com/36820

Don't take up knitting, you will never get a knitted boat waterproof😁


Shiver my Timbers and Splice the mainbrace
RNinMunich
(Fleet Admiral!)





Forum Posts: 1199
22nd Dec 2017 13:16  
>> Permalink
mdlbt.com/36821

Carbon fibre 'wool' perhaps!? 😁


Young at heart - slightly older in other places 😉 cheers Doug
AllenA
(Fleet Admiral!)





Forum Posts: 83
22nd Dec 2017 14:19  
>> Permalink
mdlbt.com/36822

Hi Doug, Obviously, you, like me, remember woollen swimming costumes. Photo for Bryan


Attached Files - Click To View Large

RNinMunich
(Fleet Admiral!)





Forum Posts: 1199
22nd Dec 2017 14:25  
>> Permalink
mdlbt.com/36823

Actually no! But I imagine they had some alarmingly revealing effects when you came out of the water!!! 😁😉


Young at heart - slightly older in other places 😉 cheers Doug
AllenA
(Fleet Admiral!)





Forum Posts: 83
22nd Dec 2017 14:42  
>> Permalink
mdlbt.com/36824

Sorry Doug, no insult intended. As to revealing, I just remember Miner's Fortnight at Barry Island in the 50s. Not a pretty sight. Sorry, also, to hijack the conversation I will go back to my Springer now.

RNinMunich
(Fleet Admiral!)





Forum Posts: 1199
22nd Dec 2017 15:08  
>> Permalink
mdlbt.com/36825

None taken! As a 'late '51 model' I am aware of their existence but don't remember seeing any 🤔 Merry Christmas 😎


Young at heart - slightly older in other places 😉 cheers Doug
marky
(Fleet Admiral!)





Forum Posts: 188
22nd Dec 2017 16:40  
>> Permalink
mdlbt.com/36831

they weren't the full ones like in the picture but my mum crocheted us five boys swimming trunks in the early 60s ,they were really absorbent and by the time you came out the water they weighed a ton with the crotch down round your knees ,this could be one of the reasons none of us were Olympic swimmers ,fond memories though .cheers Marky

Bryan-the-pirate
(Lieutenant)





Forum Posts: 17
22nd Dec 2017 18:01  
>> Permalink
mdlbt.com/36832

Thank goodness I grew up in a world where speedo's ruled. Thanks for the picture AllenA
(apologies to pilot for the diversion from his thread)


Shiver my Timbers and Splice the mainbrace
RNinMunich
(Fleet Admiral!)





Forum Posts: 1199
22nd Dec 2017 18:27  
>> Permalink
mdlbt.com/36835

As I understand them Speedos have the same effect - just the other way up!! 😁
Re 'Diversion' - according to the German Motto 'Spaß muss sein' = Fun must be 😉 Especially the week before Christmas,
Have a good one everybody, best wishes Doug 😎


Young at heart - slightly older in other places 😉 cheers Doug
olly49
(Chief Petty Officer)





Forum Posts: 14
13th Jan 2018 17:42  
>> Permalink
mdlbt.com/37363

In my Huntsman I have a T600 brushless.👍