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[NFMike]

... then buy the shiniest one.

You could certainly do worse :)

[Ogtinc]

There's a local club that I am yet to contact that I know has quite a fees active members. They are mostly from the Burton on Trent area sailing at Branston water park, where there is a dedicated area for members boats to sail.  It will most likely be there unless I find somewhere else in the meantime

[Ogtinc]

Few not fees grrr

[dodgy geezer]

Well, if no one else is making a guess, how about a Graupner Speed 400 7,2v?  Cost about £6-7? With a 7.2V 3300mAh NiMH Battery Pack (cost about £18 at Cornwall) should give the best part of 1 Hour run time?  What prop? 25mm? 30mm? ... probably want at least a 20A ESC with that....

[Ogtinc]

What do you think the performance difference would be between the 400 and 500?

[dodgy geezer]

Hmm... you're out of my area of experience, I'm afraid. I might guess that a 500 would turn it into a rocket, with a correspondingly shorter run time, but that would just be a guess, based on the statement by the seller that a 480 made it 'exciting'.

The boat will be very light if it's made of Depron and only 16" in size. Perhaps we can get some other contributors to add their bit?

[Mad_Mike]

Ill do you a list of parts that id use for this kind of boat. bare with me first though

[dodgy geezer]

.... bare with me first though

I never knew you cared! However, I think that Martin may have something to say about that...

[vnkiwi]

Hi,
The Swordsman is a very nice well handling hull, easily driven.
Mine is 12" long and was very surprised at its performance on such a tight budget.
Balsa hull, off the shelf elcheepo bits and 2.4gHz r/c
link
http://www.youtube.com/watch?v=QOHhgG6Ay3A&feature=g-upl

So yours with the setup dodgy has suggested should be a little flyer
Dave Millburn designed a 24" very easy and nice performer from which I developed mine
enjoy
vnkiwi

[Mad_Mike]

Id agree with that actually. what youve allready suggested id say was about right. The battery maybe a bit heavy i think but will work none the less. Possibly try a 7.2v in the 2700mah range. get your propshaft from marks model bits

 http://marksmodelbits.com/

contact him directly and hel knock you up a propshaft to your specification for handful of beans

this prop would go with the speed 400 motor

https://astecmodels.co.uk/catalog/product_info.php?cPath=25_50_59&products_id=347&osCsid=1afb141341d7ae57a4e78f6b7188d975

it has an m2 screw thread so when you order your prop youl want a 2mm propshaft with an m2 threaded end on it.

[Mad_Mike]

I never knew you cared! However, I think that Martin may have something to say about that...

GRRR

[dodgy geezer]

GRRR

Sorry - couldn't resist! 

Only things left would be a motor mount and coupler - Marks Models will do those as well...

And away you go.....

[Ogtinc]

Great thanks for all the replies guys, and your Swordsman looks great vnkiwi!

Looks like I'll go with the 400, and have a look at the different battery sizes to see which would best fit.

Unfortunately the prop on astec models isn't in stock would the 29mm one also be suitable? https://astecmodels.co.uk/catalog/product_info.php?cPath=25_50_59&products_id=349&osCsid=1afb141341d7ae57a4e78f6b7188d975

For the prop shaft is there a standard length or should I wait and measure the length to get it specifically for this model?

[dodgy geezer]

Do you have a plan which shows the prop and motor? If not, I would partially make the hull, decide how you're going to mount the motor, and then measure the length you require. Remember to make allowances for a coupler...

[Mad_Mike]

theres another prop at cornwall model boats

http://www.cornwallmodelboats.co.uk/acatalog/propellers_2318m2.html#aG2318_2e26

the 29 MIGHT work but you may find it will overload the motor. To be safe use the 26.

[Ogtinc]

Still waiting for the kit to come through should be here tomorrow, hopefully I'll know a bit more by then, perhaps it will advise on the length to use as I have been assured by the seller "All items required are detailed in the instructions" so we'll see :)

[knoby]

Hi Ben, whilst I totally agree with the advice you have been given so far, I just thought I'd mention what I run a similar model on.
Mine is a 16 inch Swordsman based on the George Turner plastic hull. It is fitted with a 1000kv brushless motor, a seaking 25 amp speed controller & runs a 30 mm prop ( i have tried a prop shop 3 blade & a graupner 28mm hydro prop, but there seems little difference)
I started running it with 7.2 volt 4500 mah nimh pack, which gave me around 35 mins running time ( it only ever goes flat out).
Just for fun I tried it on a 3s lipo pack ( 11.4 volts), the performance was brilliant, it spent more time in the air than on the water.
The brushless set up is more expensive, but still costs less than £30 for motor & speed controller.
I didn't use water cooling on the motor, but i connected water cooling to the speed controller, the controller is never anything but ice cold after a run, the motor gets slightly warm on 7.2 volts, but hotter on 11.4. If i was building it again i would fit a water cooled motor mount.
 
Sorry if I have confused things, just wanted to show you an alternative that works well. You could start off with 7.2 nimh batteries & with brushless you have the opportunity to upgrade to 11.4 volt lipo's at a later date.

[Ogtinc]

How hard would you say the water cooling parts are to fit?  For my first build I'm not sure whether I should just keep it simple and upgrade or make my 2nd model more complicated.

Also what glue would you guys use for the depron hull?

[knoby]

for dupron I would use this
http://www.shop4glue.com/depron-glue-depbond-foam-safe-for-all-polystyrene-styrofoam-fast-drying-craft-model-adhesive-56ml-156-p.asp

Easiest way to fit water cooling is to buy a pick up pipe from a model shop. then all you have to do is drill a hole & fit it, connect some silicon pipe to this & run it to contriller first, then to motor mount , then to outlet. Just fit the pick up pipe off centre so that it is in line with the outside of the prop to give maximum water flow from the prop.

[Ogtinc]

Great that doesn't sound too hard, although drilling more holes seems like more chance of leakage

Servo wise, is there a standard one you guys go for or should a general purpose one like http://www.cornwallmodelboats.co.uk/acatalog/graupner-4101.html do the job?

[irishcarguy]

Hi for batteries you could also look @ The Component Shop site,they give great service & have some of the best prices on batteries & other electric stuff, I have no connection except a very satisfied customer & I think they have very good local shipping rates too. Mick B.

[Ogtinc]

Seems they are also out of stock of the battery I'm looking for, must be a popular one!

[irishcarguy]

Hi Ben I think you will find if you ask they will make it up for you, @ least I think so, Mick B. PS = Check your pm's.

[Ogtinc]

Great, dropped them an email. 

Thanks 

[Mad_Mike]

Great that doesn't sound too hard, although drilling more holes seems like more chance of leakage

Servo wise, is there a standard one you guys go for or should a general purpose one like http://www.cornwallmodelboats.co.uk/acatalog/graupner-4101.html do the job?

 a standard one will be fine. look on ebay you can pick em up for a couple of quid