R/C batteries.

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Terence Lynock (MSW) - 15 Nov 2006 01:03 GMT

I have been building scale sailing models for many years for collectors
and museums but with the advent of our first grandson I have decided to
build a fully detailed R/C model of the trawler 'Ladysmith' at 1/48
scale for him to take down the local boat pool when he is older which is
only five minutes walk from his house (lucky blighter).
Thing is I only know the basics of R/C and am somewhat confused as to
how long batteries last and motor sizes etc, I have a nice 545 motor and
a slightly used 540 and some other stuff but my need is for battery info
i.e how long would a 12v 1.2 Ah battery power a 545 motor or am I better
off going for a larger battery.
As this is a trawler of 1905 vintage I dont want it taking off like a
Seacat so need to keep the revs in order, what is the best way to do
this and the approximate screw rpm for a 2'' prop with the 545 behind it
for the speed to look realistic?, I am also looking at building a sea
going tug of the 1920 - 40 era later if anyone has any suggestions,

many thanks, Terry

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A.T. - 15 Nov 2006 09:10 GMT

"fully detailed R/C model of the trawler 'Ladysmith' at 1/48"
? = 12" or 36" long? beam? depth of hull?
without further detail, I suggest you refer to the sub sections:
"Battery care, Chargers & Power Supply.:
"Boats, Yachts, Submarines, Warship Combat and Nautical reviews"
on my web page, especially

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Regards
Alan T.
Alan's Hobby Model & RC Web Links
http://homepages.ihug.co.nz/~atong/

> I have been building scale sailing models for many years for collectors
> and museums but with the advent of our first grandson I have decided to
[quoted text clipped - 13 lines]
>
> many thanks, Terry

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Terence Lynock (CSD) - 15 Nov 2006 19:25 GMT

The message <ejfluf$rii$1@lust.ihug.co.nz>
from "A.T." <atong@ihug.co.nz> contains these words:

> "fully detailed R/C model of the trawler 'Ladysmith' at 1/48"
> ? = 12" or 36" long? beam? depth of hull?

Hi Alan,

Hull will be 36'' long x 5.75'' beam and 4.5'' depth of
hull midships and 3'' keel to waterline approx, weight of the model I
have no idea as yet but it will be wooden construction plank on
bulkhead.
I have a new 540 motor also a 545 motor spare and the plans show a 2'' x
3 bladed prop, I have no idea what rpm the prop should run at or what
size lead acid battery to use to best effect and for scale speed, all my
R/C tinkerings in the past were pretty hit-and-miss and if things worked
properly it was a bonus but need to get this one right,

regards, Terry

Reply to this Message

thelaws - 16 Nov 2006 02:53 GMT

> The message <ejfluf$rii$1@lust.ihug.co.nz>
> from "A.T." <atong@ihug.co.nz> contains these words:
[quoted text clipped - 15 lines]
>
> regards, Terry

I would recommend using a sealed gel cell battery instead of a lead acid
battery. They come in a great verity of shapes and sizes and eliminate the
mess and danger of acid spillage. Pete

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A.T. - 16 Nov 2006 08:26 GMT

Suggest you refer to
http://oldriverbillzumwalt.members.ktis.net/ and all the good hints and tips
thereon.
Use SLA (gellcell) batteries which help with good amp hours and as ballast.
ESC & Motors, read up on
http://www.electronize.co.uk/model_electronics_frames.htm
Regards
Alan T.
Alan's Hobby Model & RC Web Links
http://homepages.ihug.co.nz/~atong/

> The message <ejfluf$rii$1@lust.ihug.co.nz>
> from "A.T." <atong@ihug.co.nz> contains these words:
[quoted text clipped - 15 lines]
>
> regards, Terry

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Model Forum / General / Models / November 2006

R/C batteries.