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Author Topic: Run time (part 2)  (Read 3466 times)

Patrick Henry

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Run time (part 2)
« on: August 07, 2011, 07:07:24 am »
Sort of following on from 'running time' ...

I've just bought this from that  well known auction site


It's very similar to the Krick "Lisa M" in hull shape, and measures 890mm in length....would one of you more knowledgeable types recommend a motor and battery pack combination for it, please?

I'd like to think I could get around an hour's worth of sailing with it(longer would be a bonus)mainly pottering about, interspersed with a quick blast up and down the lake now and again.


Standing by...


Rich
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nick_75au

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Re: Run time (part 2)
« Reply #1 on: August 07, 2011, 07:23:39 am »
A nice little 1000 kv 22 mm outrunner, 30 -40 mm prop and a 7.4 volt 4000 mah li-po.

http://www.giantcod.co.uk/22179t-200w-950kv-brushless-outrunner-motor-p-405614.html

Cheers
Nick
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Patrick Henry

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Re: Run time (part 2)
« Reply #2 on: August 07, 2011, 07:27:06 am »
Would that require a special esc?
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nick_75au

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Re: Run time (part 2)
« Reply #3 on: August 07, 2011, 07:29:39 am »
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Patrick Henry

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Re: Run time (part 2)
« Reply #4 on: August 07, 2011, 07:32:23 am »
Thanks Nick, much appreciated...so you think that the brushless/lipo combination is the way to go?
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nick_75au

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Re: Run time (part 2)
« Reply #5 on: August 07, 2011, 07:44:40 am »
Could be, A "Speed 500 E"  direct or any other speed 500 geared to give the same RPM at 7.4 would work which is about 7500 RPM at 7.2/4 volts. If you put in a faster motor, say a Speed 500 BB SP 7.2 or 8.4 the run time would be less dependant on use of the throttle  :-)) Speed 600 of an appropriate voltage (14,4 Volt version) would work as well just extra weight.

Nick
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Patrick Henry

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Re: Run time (part 2)
« Reply #6 on: August 07, 2011, 07:47:34 am »
Ok, thanks again Nick...I'll go take a good look around the Giant Cod website.
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Patrick Henry

  • Guest
Re: Run time (part 2)
« Reply #7 on: August 08, 2011, 01:09:51 pm »
Well, it's just arrived...by heck, but it's big. The website states it's 890mm in length, oal when the railings and the dingy on the stern davits are fitted is a tad under a metre.

The instructions (in Czech-ese) call for 2 x Speed 600BB's on 2 x 9.6v 4000a/h cell packs...no little brushless motors, I'm afraid. (or does anyone have any ideas on this?)









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DickyD

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Re: Run time (part 2)
« Reply #8 on: August 08, 2011, 02:41:13 pm »
I normally use the power train the manufacturer suggests, after all they designed the thing.

Makes a change for them to tell you what to use . :-))
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Richard Solent Radio Controlled Model Boat Club http://www.srcmbc.org.uk

Patrick Henry

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Re: Run time (part 2)
« Reply #9 on: August 08, 2011, 02:44:01 pm »
Quote from: DickyD on August 08, 2011, 02:41:13 pm
I normally use the power train the manufacturer suggests, after all they designed the thing.

Makes a change for them to tell you what to use . :-))


Very true, Dickie....
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nick_75au

  • Guest
Re: Run time (part 2)
« Reply #10 on: August 09, 2011, 04:27:23 am »
Go Up to a 28 mm If your worried, I would probably go up to a 30 amp ESC for each motor as well, Speed 600 BB is about 1700 Kv and about 50 watts at peak efficiency.

Looks like a nice boat, not so sure of the gaudy stickers though.

Cheers
Nick
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