Help – 48 inch Fairey Huntsman 31

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Help – 48 inch Fairey Huntsman 31

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8 August 2019 at 15:32 #83328
Andrew Hines
Participant
@andrewhines24298
Hi,

Can anybody help me. I have just bought a 48” Fairey Marine Huntsman 31 part finished . Could anybody suggest what size Brushless Motor would be suitable to give this model stunning performance.

Thanks
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8 August 2019 at 15:32 #2855
Andrew Hines
Participant
@andrewhines24298
Brushless Motor
8 August 2019 at 15:55 #83329
Dave Cooper 6
Participant
@davecooper6
Hi Andrew,

I wouldn't automatically exclude brushed motors as there some advantages for marine use. However, that is a big model !

I'm sure the experts will be along soon to give you all the advice you need…

Good luck with your project,

Dave
8 August 2019 at 16:00 #83330
Dave Milbourn
Participant
@davemilbourn48782
Andrew

This is the motor which SLEC suggest for the latest version of that kit. I would run it on a 6S LiPo pack with either a S55 or X55 2-blade prop. A 70A ESC will be needed, and don't even think about using a Huco-tyoe universal coupling. You need one with a solid rubber center piece, like those made by SHG Marine Models for 0.60 glow motors. Turnigy Motor

Dave Milbourn
8 August 2019 at 17:17 #83332
Ray Wood 3
Participant
@raywood3
Hi All,

This is dangerous information, I always fancied the the bigger H31 😀 with that set up very tempting ! Perhaps my wife needs an idea for my Christmas present.

Regards Ray
8 August 2019 at 17:24 #83333
Dave Milbourn
Participant
@davemilbourn48782
Ray

Easy! Buy her one for a Christmas prezzy and then offer to build it for her…….

Dave M
8 August 2019 at 20:25 #83337
captainslog
Participant
@captainslog
easy! go GLO!!! my 48" virgin challenger has a SC60 and used to go like stink. happy days back then. must get it out of the shed this winter and back to the beach next summer
8 August 2019 at 21:32 #83345
Ray Wood 3
Participant
@raywood3
Yes those were the days 😀 we are all driving Tesla boats these days 😁

Regards Ray
9 August 2019 at 11:20 #83351
Chris Fellows
Participant
@chrisfellows72943
When I first got interested in model boats about 3 years ago I bought a 48" Huntsman 31 but with the lead acid battery it was very heavy and cumbersome to move around. I've since ditched the battery and taken out the old gear which I will replace with modern stuff along with the 850 motor.

Plan was to move it on once I'd built my 1:12 version, but it is well built, apart from the cockpit, so may well keep it now. I've also now got a car with a nice level load area, unlike the previous one, so it will be easier to transport.

Chris
9 August 2019 at 12:23 #83353
harry smith 1
Participant
@harrysmith1
Hi Andrew

DM is spot on with the G60 motor has one of our members had one in his Fantome which is about the same size boat.

Very quick and he uses it for a video camera boat to post on you tube.

See under sgsteveg search.

Harry Smith
12 August 2019 at 09:32 #83404
Former Member
Participant
@formermember11541
[This posting has been removed]
12 August 2019 at 10:29 #83405
Dave Milbourn
Participant
@davemilbourn48782
The prototype Modav H31 46" model had an HP 61 F R/C glowplug motor. This was about the most powerful 10cc glow engine on the market at the time and claimed an output of about 1.2BHP – or around 900W. Its performance was impressive and scale-like.

The Turnigy G60 claims a maximum power output of 1500 W (2 BHP) so it will be more than powerful enough on a 6S LiPo pack. The motor costs around £50. If your friend is already familiar with brushless motors and LiPo batteries then the technology will hold no mysteries for him.

Acording to MFA's own data the 850 puts out 80W of power at maximum efficiency and cost around £30. It's also noisy and current-hungry.

I think those figures say it all.

I have seen examples of this model powered by an 850 motor and even without a stupidly-heavy SLA battery they perform like canal narrowboats. As the bloke who designed the Huntsman kit back in 1972, watching such a travesty makes me very sad.

Dave M
12 August 2019 at 11:10 #83407
Dave Milbourn
Participant
@davemilbourn48782
Just for those who haven't seen a Huntsman 31 travelling at 'an approriate speed', here's a video of my little 1/16 scale one, taken by Martin Davis at Wicksteed Park a few years ago. The choice of music was his! Huntsman 31 at Wicksteed Park

The motor is a brushless Turnigy 28mm one running on a 3S LiPo.

Dave M

Edited By Dave Milbourn on 12/08/2019 11:12:08
12 August 2019 at 19:59 #83409
Former Member
Participant
@formermember11541
[This posting has been removed]
12 August 2019 at 22:10 #83413
Colin Bishop
Moderator
@colinbishop34627
I'm building the SLEC Swordsman at the moment and thoroughly enjoying it.

Love working with the wood construction. The bits fit together nicely but there is still some satisfying shaping to do and I will hopefully end up with a near scale model as a stablemate to my earlier Huntsman.

Colin

Edited By Colin Bishop on 12/08/2019 22:16:51
12 August 2019 at 22:42 #83415
Dave Milbourn
Participant
@davemilbourn48782
I'm only too happy to keep bringing Faireys to the masses!

DM
13 August 2019 at 07:31 #83416
Former Member
Participant
@formermember11541
[This posting has been removed]
13 August 2019 at 08:32 #83417
Dave Milbourn
Participant
@davemilbourn48782
I would definitely NOT recommend any type of 'plastic + brass insert' universal joint as a coupling. They aren't strong enough to transmit that amount of power. I would strongly suggest he approaches SHG and has them make a BA-threaded version of their marine rubber flexi coupling (Page 20 of their catalogue). They aren't cheap but they do the job more than adequately. I now use them exclusively. SHG Catalogue

Dave M
13 August 2019 at 09:38 #83419
Former Member
Participant
@formermember11541
[This posting has been removed]
13 August 2019 at 09:48 #83420
Former Member
Participant
@formermember11541
[This posting has been removed]
13 August 2019 at 10:53 #83421
Dave Milbourn
Participant
@davemilbourn48782
Cap'n

Tell him that the prices in the catalogue were current 6 years ago and they've gone up a wee bit since then. He'd best telephone SHG as they are notoriously old-fashioned and tend to leave E-Mails at the bottom of the to-do list!

I'd guess he'll need a plain 6mm-to-2BA threaded coupling, but best double-check that last dimension.

DM
13 August 2019 at 12:12 #83422
Former Member
Participant
@formermember11541
[This posting has been removed]
13 August 2019 at 13:50 #83423
Dave Milbourn
Participant
@davemilbourn48782
Smart money says to aim for a shaft speed (unloaded) of around 9-11,000 RPM, so a 500kv motor running on 6S (22.2v) should be in the zone.

Yes, I did forget the two T's – can't think why. That "some time" is fast approaching 50 years – scary, isn't it?

DM
13 August 2019 at 14:09 #83424
Former Member
Participant
@formermember11541
[This posting has been removed]
13 August 2019 at 15:13 #83425
Ray Wood 3
Participant
@raywood3
Hi All,

As I've been RC flying & floating boats model & fullsize for the last 50 years, I have a foot in each camp, lets not discuss the new CAA registration on the Model Boats forum?

Regards Ray
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