Model Boat Mayhem

The Shipyard ( Dry Dock ): Builds & Questions => Pleasure boats, Sports, Race, Power and Leisure Boats: => Topic started by: Steve1961 on September 06, 2011, 04:01:07 pm

Title: Huntsman
Post by: Steve1961 on September 06, 2011, 04:01:07 pm

Hello all, I'm thinking of building the Huntsman as my next project after my Atlantis,
I would like to do the 46inch version with glass fibre hull, also using twin propellers.
What sort of motors would I need and what sort of battery, ies.
The building part I'm not to worried about as I built her many years ago but the knowledge of powering her I'm lacking in.
So basically motor and battery type and prop size.
Thank you for any advice
Steve.

Title: Re: Huntsman
Post by: MikeA on September 06, 2011, 09:21:56 pm

depends what budget you on if you go brushless or brushed.

Title: Re: Huntsman
Post by: MikeA on September 06, 2011, 10:03:55 pm

bruhless maybe this:
2 45-50mm props

2 of these:
http://www.hobbyking.com/hobbyking/store/__8489__Turnigy_4250_Brushless_Motor_1000kv.html
2 of these:
http://www.ebay.co.uk/itm/SEAKING-120A-Water-Cool-Ship-Brushless-Motor-ESC-SL168-/270646728447?pt=UK_ToysGames_RadioControlled_JN&hash=item3f03cd56ff
and 2 of these:
http://www.ebay.co.uk/itm/NP7-12-12v-7Ah-Yuasa-Lead-Acid-Rechargeable-Battery-/120763733719?pt=UK_ConsumerElectronics_Batteries_SM&hash=item1c1e1456d7

you might get away with a single 12 12ah battery


brushed use a pair of 900's with 45-50mm props and 2 30 amp escs

Title: Re: Huntsman
Post by: Steve1961 on September 07, 2011, 08:30:49 am

Thats great, the budget is very flexible, have you any idea what angle the prop tube needs to be on this model...for that particular set up that is.

Title: Re: Huntsman
Post by: MikeA on September 07, 2011, 01:55:57 pm

im afraid i dont. it turns out that the average discharge capabilty of a 12v 7.2 ah battery is 100-130amps. 2 motors drawing at 54 each is a bit close for comfort. secondly you wont need a 120amp esc's i messed up there you need 80 amp esc's.

2 of these:
http://www.ebay.co.uk/itm/SEAKING-80A-High-Voltage-Ship-Brushless-Motor-ESC-SL173-/390342426282?pt=UK_ToysGames_RadioControlled_JN&hash=item5ae238beaa

if you get a 12v 12ah battery providing space and weight will allow.
http://www.ebay.co.uk/itm/2-x-RITAR-12V-12AH-MOBILITY-SCOOTER-BATTERIES-/160644696248?pt=UK_Health_Beauty_Mobility_Disability_Medical_ET&hash=item25672b88b8

there 4kg in weight 150mm long by 100mm high by 100mm wide.

youl roughtly get a run time of about 25mins, give or take 5 mins