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Author Topic: Lipo Relacement  (Read 1572 times)

Stan

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Re: Lipo Relacement
« Reply #25 on: January 03, 2019, 09:16:15 PM »

My model is built to 1/35 scale slightly larger than ojays it carries two 7.2 volt 30000 n mhi batteries with no problems. Fitting a lipo may be fine but more ballast will be needed. Why not go 2/3 sub c packs I think the original Glynn Guest plan was scaled at 1/72.

Stan

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malcolmfrary

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Re: Lipo Relacement
« Reply #26 on: January 04, 2019, 10:50:37 AM »

High capacity AAA NiMh cells are a poor choice to provide power to motors. They have a high internal resistance so are incapable of providing higher currents without a high voltage drop. They are designed to power electronics with a low current draw.

Jim
I wish somebody had told me that before I did it and found out that they work, albeit in a boat running rather less motor.
But it was a slip of the finger, should have been AA cells. 
The string of 5 AAA was in a boat powered by a servo motor, duration was over 1 hour, enough to get round the 1 mile of lake side and then mess about a bit.  Since replaced by a pair of 18650 Li-Ion cells in holders connected through a harness and working the boat via a 5A UBEC.  The labels claim 9800 mAH.  Obviously low C rating, but I haven't had the opportunity for a proper trial yet.
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ojays

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Re: Lipo Relacement
« Reply #27 on: January 05, 2019, 03:28:12 PM »

My model is built to 1/35 scale slightly larger than ojays it carries two 7.2 volt 30000 n mhi batteries with no problems. Fitting a lipo may be fine but more ballast will be needed. Why not go 2/3 sub c packs I think the original Glynn Guest plan was scaled at 1/72.

Stan

.
The Glynn Guest plan is a standoff 1/48 scale.
Looking at photo's of the real thing, the 1/48 Huey appears to be about the correct scale for the vessel.
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Stan

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Re: Lipo Relacement
« Reply #28 on: January 05, 2019, 08:49:45 PM »

HI Ojays  just a few pictures of the internals of my model. It is now going in for a refit new battery new fuses Rx battery and tidy up all the cables. will post pictures of the top section later next week.

Stan.
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Stan

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Re: Lipo Relacement
« Reply #29 on: January 05, 2019, 08:52:39 PM »

Final pictures.
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Taranis

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Re: Lipo Relacement
« Reply #30 on: January 05, 2019, 08:57:14 PM »

Great pictures Stan  O0 :-)
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ANDY
Happy modelling since Jan 2017
MidWest Lobster boat
My Portgarth

Stan

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Re: Lipo Relacement
« Reply #31 on: January 05, 2019, 09:01:56 PM »

Should be better when the refit is complete. The next project to be done is the DUKW new drive battery voltage reg for the lights  tidy up the wiring a little.

Stan. :-)) :-)) :-)) :-)) :-)) :-))
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ojays

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Re: Lipo Relacement
« Reply #32 on: January 05, 2019, 10:23:55 PM »

Wow, very impressive.
Is it an A.T.C.H. or one of the monitors.
I quite fancy doing an Erma Douche water canon version some time.

You have far more detail than I have managed to do on mine.

I see your also like myself an 'Action' electronics person.
I have used their products on all my builds except this one so far
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Stan

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Re: Lipo Relacement
« Reply #33 on: January 05, 2019, 11:42:45 PM »

Hi ojays A T C H two years ago at the model boat convention at Haydock it came first in the Glynn Guest competition.The section was for best Glynn Guest model.

   




Stan
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ojays

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Re: Lipo Relacement
« Reply #34 on: January 06, 2019, 12:25:29 AM »

Well done.
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Steam Boat Willie

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Re: Lipo Relacement
« Reply #35 on: January 19, 2019, 11:11:38 AM »

I have no idea what happened to my earlier post on this thread with pictures of Stan Reffins example of this model so let's try again and hope that these don't mysteriously disappear.
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Stan

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Re: Lipo Relacement
« Reply #36 on: January 19, 2019, 11:23:29 AM »

Thanks for that S. B. W. the refit is now completed pictures later today.

Stan.
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