Huntsman 31

[goldtj]

Does ne 1 else here have a huntsman 31? Its an all wood hull and top. I'm running a stock motor with two 2100 packs in parallel.

[goldtj]

wiring photo

[goldtj]

Does ne 1 have ne tips on how to solve this prob: The water scoop for the esc is just in front of the rudder (look on da pic) and it doesnt seem to pick up when the boat is running at nething less than full speed and even then it doesnt pick up much. I'm worried bout cooking da esc. Ne1 got ne tips?

[Climate]

The cooling water does not need to shoot out of the exit like it came out of a hose.
A slight dribble is all you need. As long as it is moving.

Peter

[goldtj]

it doesnt even seem to be circulating

[goldtj]

Also the stock motor has big probs getting da hull to plane. In fact i havent managed it once yet. Does ne 1 know wots causing it not to plane or is it simply under powered?

[MikDee]

Nice looking boat!,,, I'd say your stock motor does not have enuff torque, it can't get the rpm up, hence it overheats,,, you need a Kyosho 22T Magnetic Mayhem monster truck motor.

[goldtj]

hehe as luck would have it i actually have 1 of those. But arent the stock motors about 27 turns neway? surely more turns = more torque but less top end?

[Andrewg]

Gold

which motor are you using
you need to put the pickup nearer the prop - the motor should need cooling as much as any controlelr in this setup

dont use the mag mahyem wrong motor

This boat was a semi planing hull. I.e it didnt plane fully. Look up Fairey Hunstman on Google search engine and you will get pics to show you how it ran.

The kit is not bad but

what is the motor (make and model help)
what prop are you currenly using

The original hull ran twin props - the model uses one - you need a large prop which wmeans a large slowly rotating motor - this is quite doferent from what you appear to have.

I have worked with these hulls before. The semi-planing hull makes thema challenge. Nonetheless the changes required are simple and effective

However and with apologies to the people have contribuited the answers have not been provided in this thread

andrew
andrew@fastelkectrics.com

[goldtj]

Andrewg
Thanks for that. Atm its running a stock 540 motor that came wiv da kit. Im using a two bladed prop wiv quite a steep pitch (see pic) do i need to change this then? Also how does a semi-planing hull work?

[goldtj]

other pic

[Andrewg]

OK the shaft needs to be more horizontal

the prop blades should be in front of the water pickup and shoot
water into it

For the meoment remove one of the cell packs - how does it run then

A semi planing hull is one that does not separate from the water the hull sit in the water all the time

What is the hull length and weight?

The motor that works well in these is one with about 1000 rpm/v with a large prop like a 450/3

[goldtj]

err that prop shaft is the angle its sposed to be at cos the keel pieces were already drilled for the shaft.

I guessed that about the pickup but its already as far out of the hull as it can be.

Taking out one of the packs doesnt make that much difference.

Do u mean weight wiv all the gear on board and the superstructure on or just the empty hull?

Wot rpm does a stock motor turn at? Also wont i need a motor wiv loadsa torque to turn a large prop?

Im new to boating so wot does a 450/3 prop mean? Thanx

[Andrewg]

the hull may have been predrilled - but does it work???

weight with everything in the boat

plus length of the baot overall

X450 means an Octure general purpose prop (X) 1.4:1 ratio in the pitch to the prop diameter (4); 50mm diameter prop (50); three blades (/3)


If you want to leave it all the way it is I cant help

To make it work you may have to change things.

[goldtj]

i drilled the keel as it was set up. I will go weigh n measure it l8er. Thanks i will search out 1 of those props. Do Grauper do nething similar cos i can get hold of those easier. Do u think i shud leave the stock motor in or not?

Cheers

[MikDee]

In my opinion, what you should do First!, is pull out and shorten the driveshaft enuff so that the prop is about 1 inch from the bottom of the hull to center of the shaft on the end (to leave room for a bigger prop without interfering with the hull), and this would do 3 things, (1) give you less uhderwater drag (2) put the thrust cone of the prop closer to the water pickup, helping circulation (3) put the thrust cone of the prop directly at the rudder, making your steering work better.

[Andrewg]

wooo!

first dont get the prop till you gve me weight and motor details

I may well be wrong for your setup

I have a bunch of details onthis hull but I need to know what you are running to say heres a road out of the problems you are having

if you give me th enumbers and thr peop diameter I can give you a fairly precise setup which should work first off

And for that you may need that extra shaft length - but at the moment the angle, as Mike is suggesting, is very innefficient in a number of respects

Andrew Gilchrist
www.fastelectric.com

[goldtj]

length at deck level = 880mm with a prop diameter of 40mm (2 bladed). My scales are bust atm. Am workin on them

[Andrewg]

Ok that length tells me plenty

The scale speed is 11 mph.

For this you need to get a prop of 50 mm diam something like a three blade Octura X450/3

The motor should be a low rpm/v item . It should turn about 8500 under load. Inexpensive motors which do this are the Graupner 600 Turbo BB 12v (36mm or 1.4" diameter) or the Graupner 700BB 9.6v (42mm or 1.8" diameter) (preferred)

The one you choose depends on which motor is currently in your hull. It looks bigger than a 600 sized motor.

This setup is relaible and has worked in this model.

Andrew
www.fastelectrics.com

[goldtj]

Thanx. The motor in atm is the stock 540 size. and i built the mounting box to fit. Are there ne motors u can suggest that run on 7.2v otherwise i may have to change my esc.

Thanx

[Andrewg]

Ok the Graupner 9.6v BB Turbo will work on 6 cells - you need to get a X450/3 and you should have a scale running model

Andrew

[goldtj]

cheers

[Andrewg]

GOLD

a big proviso on all this - it will woork much better on 2 cells in series with a motor like a graupner 820bb or a 700 with less rpm than the 9.6v ie about 800rpm/v

[goldtj]

2 packs in series = 14.4 volts = gd bye esc!!!