Bigges bang for $130

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wagel - 16 May 2009 22:09 GMT

Hi guys

I'm new to electric boats but I have flown R/C aircraft for years. I
thought that it would be fun to try an electric boat too. Now I have
$135 for motor, esc and 2 batteries (3would be perfect I think). It
would be a scratch-build mainly using carbon fiber, fiberglass, balsa
and plywood. I suppose it should be a mono V as I am planning to use it
on both a river and a lake. Faster is better :D I'm also planning to use
it as a little fishing boat for pulling bait behind it (I assume that
pulling power is opposite to speed. Maybe using different pitch screws
would help?

I'm going to buy from 'Hobbycity Online R/C Hobby Store :'
(http://www.hobbycity.com)

I would use a suitable amp rating SuperSimple ESC (convert it to water
cooling).
For motor I found these two:
'Hobbycity Online R/C Hobby Store : 2848SL 3900kv Brushless Inrunner
(WaterCooled) $37.95' (http://tinyurl.com/plgmpr)
or
'Hobbycity Online R/C Hobby Store : TR 28-45 3600kv Brushless Inrunner
(WaterCooled) $29.90' (http://tinyurl.com/p5jfv9)
or
'Hobbycity Online R/C Hobby Store : HXT 36-56 2700kv Brushless Inrunner
(WaterCooled) $44.95' (http://tinyurl.com/qpl5o3)
the last one would blow my budget as I would need at least 4000mAh
4cell lipo or what do you think?

Which would be better? Or should I choose a non-water cooled inrunner
and try to convert it? (would it be cost effective - cheaper)
Like maybe this one:

'Hobbycity Online R/C Hobby Store : Turnigy B36-56-04 2600kv Inrunner
$25.95' (http://tinyurl.com/pg6kgl)
For battery I found:
'Hobbycity Online R/C Hobby Store : ZIPPY Flightmax 4000mAh 3S1P 20C
$31.97' (http://tinyurl.com/pn9yht)
for 3cell
or
'Hobbycity Online R/C Hobby Store : ZIPPY Flightmax 3000mAh 4S1P 20C
$33.98' (http://tinyurl.com/ozmw53)
for 4cell (to smaller motors)

or for larger ones
'Hobbycity Online R/C Hobby Store : ZIPPY Flightmax 5000mAh 4S1P 20C
$60.05' (http://tinyurl.com/pttt4k)

Am I thinking in the right direction or should I choose a completely
different setup?
Any suggestions for drawings?
Thanks

Signature

wagel
Free RC Model Boat Plans: http:\/\/www.modelpowerboat.com\/forum\/downloads.htm

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Randy - 18 May 2009 11:35 GMT

> Hi guys
>
[quoted text clipped - 13 lines]
> I would use a suitable amp rating SuperSimple ESC (convert it to water
> cooling).

I am using the 70 amp version of this ESC with the HXT 36-56 2700kv
Brushless Inrunner motor, below. I have 2 - 4200 MAh batteries supplying
14.4 volts. I did not water cool the ESC and have found that it barely gets
warm to the touch. I can recommend this combination. I have it in a 27"
rigger and it is very fast. I don't know that it will do very well pulling a
fishing bait, as it is pretty fast even at part throttle. For boats, I
prefer NIMH batteries to Lipos. They are cheap enough that I can afford
several packs for each boat and I don't have to worry when charging them.

> For motor I found these two:
> 'Hobbycity Online R/C Hobby Store : 2848SL 3900kv Brushless Inrunner
[quoted text clipped - 31 lines]
> Any suggestions for drawings?
> Thanks

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wagel - 18 May 2009 22:29 GMT

But what about using http://tinyurl.com/qfhmny this one. When I add
watercooling (wrap a pipe around it), it would be as good as the water
cooled $45 one and be $15 cheaper?

Signature

wagel
Free RC Model Boat Plans: http:\/\/www.modelpowerboat.com\/forum\/downloads.htm

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Model Forum / Radio Controlled / Water Models / May 2009

Bigges bang for $130