Model Boat Mayhem

Mess Deck: General Section => Model Boating => Topic started by: Patrick Henry on August 07, 2011, 07:07:24 am

Title: Run time (part 2)
Post by: Patrick Henry 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 (http://s3.postimage.org/1av3wt004/cruiser_2.jpg) (http://postimage.org/image/1av3wt004/)


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

Title: Re: Run time (part 2)
Post by: nick_75au 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

Title: Re: Run time (part 2)
Post by: Patrick Henry on August 07, 2011, 07:27:06 am

Would that require a special esc?

Title: Re: Run time (part 2)
Post by: nick_75au on August 07, 2011, 07:29:39 am

Just a normal Brushless ESC

http://www.giantcod.co.uk/ezrun-reverse-program-brushless-p-403361.html

Cheers
Nick

Title: Re: Run time (part 2)
Post by: Patrick Henry 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?

Title: Re: Run time (part 2)
Post by: nick_75au 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

Title: Re: Run time (part 2)
Post by: Patrick Henry on August 07, 2011, 07:47:34 am

Ok, thanks again Nick...I'll go take a good look around the Giant Cod website.

Title: Re: Run time (part 2)
Post by: Patrick Henry 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?)


(http://s4.postimage.org/a71kq8o4/08082011068.jpg) (http://postimage.org/image/a71kq8o4/)

(http://s4.postimage.org/a76jca5g/08082011069.jpg) (http://postimage.org/image/a76jca5g/)

(http://s4.postimage.org/a79uez50/cruiser_1.jpg) (http://postimage.org/image/a79uez50/)

(http://s4.postimage.org/a7d5ho4k/08082011071.jpg) (http://postimage.org/image/a7d5ho4k/)

Title: Re: Run time (part 2)
Post by: 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 . :-))

Title: Re: Run time (part 2)
Post by: Patrick Henry 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....

Title: Re: Run time (part 2)
Post by: nick_75au 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