D class Dog Boat

Started by Muskrat
14 replies 12 likes Last activity: 5 years ago
#15

D class Dog Boat

Hi All, I picked up the kit today with Four Motors, Four Propshafts, Four Props and Two 20amp ESC's and run them on non Lipo 7.2volt Batteries. Keep an eye out for my build blog when i start building.

Cheers Jon
j a Easter.
Liked by Rookysailor and pressonreguardless
#14

D class Dog Boat

That is what I was trying to explain, without the knowledge to back it up. Thanks for the clarification. This old dog is STILL learning. Will wonders never cease......
Liked by dave976
#13

D class Dog Boat

Many thanks for the clarification and update that's very useful info 👍
Best wishes jonb
Liked by dave976
#12

D class Dog Boat

Hi jonb
Esc's designed to work with LiPo's have additional circuitry built in that allow the user to set the low voltage cut off point. This results in a higher cost.
This is important as LiPos will be damaged if discharged below the manufacturer's specification. I monitor my cells on the model and try not to discharge my LiPo's below 3.5volts per cell.
Damage to LiPo's is cumulative and irrepairable so unless you want to keep replacing batteries a device that cuts the power below a certain voltage will save money in the long term. Overcharging should also be avoided and the safe storage voltage is 3.7v per cell. A good balanced charger will keep your batteries in good condition and keep you and your models safe.
The ESC doesn't care what type of battery is used as long as the voltage is within its operating spec. Some ESC's designed for LiPos have a low voltage point of 7.4 volts so will not work with NiMhs of 7.2volts or indeed any battery below 7.4volts. All have an upper voltage limit and if you exceed this they usually issue smoke or fail to offer fwd/rev or good speed control.
#11

D class Dog Boat

Not sure of difference either, but had a MTroniks non LIPO ESC that worked perfectly well on a SLA cell.
Wanted more boat performance with a lighter installation and the dreaded grey smoke resulted.
Often wondered why!
Think Doug (RN in Munich) could be our best guide.
#10

D class Dog Boat

I am not quite sure of the difference, but I suspect it has to do with the voltage drop in LIPO's. I suspect the ESC has a lower voltage limit built into it to prevent damaging the LIPO, whereas a 12 lead acid or such could be run down much farther without damaging it. One can use a LIPO ESC for lead acid (or SLA), but I dont beleive one can do the reverse. I have been using the LIPO versions of the ESC's I previously posted simply because of the higher amp rating available.
I must plead my ignorance on this subject because I shy away fro LIPOs like COVID. Hopefully someone with better knowledge will chime in. Doug????
This looks like a wonderful build to do. Please keep us in the loop.
Liked by jonb
#9

D class Dog Boat

Hi Rowen i will run a blog on building this boat, i am picking up the kit tomorrow.

Cheers Jon
j a Easter.
#8

D class Dog Boat

Hope you write a blog on this boat. Have long thought of building one
Rowen
Liked by Muskrat
#7

D class Dog Boat

Thanks for the link to the video's very interesting, I am going for four screws instead of two.

Cheers Jon
j a Easter.
Liked by Rowen
#6

D class Dog Boat

Hi All
Just to follow on ...Lipo ESC. v 12v ESC , can someone explain the difference as Lipo's
appear a little more expensive . Why ,?
Can I really use either ?😊

Thanks
#5

D class Dog Boat

Hi Jon,
I found a vidio of your vessel to be, perhaps you have it already.
and I agree the more screws the better 😮😮
Trev
https://www.bing.com/videos/search?q=deans+marine+fair+mile+dog+boat&&view=detail&mid=075EE5AC0093A3FD7A51075EE5AC0093A3FD7A51&&FORM=VRDGAR&ru=%2Fvideos%2Fsearch%3Fq%3Ddeans%2520marine%2520fair%2520mile%2520dog%2520boat%26%26FORM%3DVDVVXX
Liked by Muskrat and Griss
#4

D class Dog Boat

"I do like the idea of having four screws turning as it would be in keeping with the real thing."
That said, I would think that you could get by with 385's for motors and have plenty of speed. of course, three 800's would allow for a very heavy armament😍
Liked by Griss
#3

D class Dog Boat

Hi, Thanks for your advise I will look into the product. I do like the idea of having four screws turning as it would be in keeping with the real thing. 😊
j a Easter.
Liked by pressonreguardless
#2

D class Dog Boat

Jon,
The ESC nees to be matched to the load of the motors, so first determine the maximum current draw of the motors you choose. personally I prefer to look for an ESC with 50% or more capacity than the maximum motor draw. As such, I have used these with wonderfl success. They are a bit more expensive, but there is no set up, they are silent, no motor/ESC whine, and the have ecellant low speed response and control. This particular model may be over kill for you so look at their entire line. I use the LIPO version even though I run 12v. https://www.modellbau-regler.de/shop/product_info.php?products_id=52
Are you sure that you don't want four screws turning? There would not be a fish line safe for miles....😂
Liked by Muskrat
#1

D class Dog Boat

Hi, I am going to build a Deanes Marine 1.24 scale FairMile dog Boat, The supplier recommends either four motors or two Motors, I would rather go down the Two motor easier route and they recommend two M800 motors will that be ok with one 12volt battery also can anyone suggest what speed controller to use with this set up.

Cheers Jon
j a Easter.

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