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Post by Mark on May 22, 2008 6:10:57 GMT 1
This is my little project on the side. It's a 7 ton Korean fishing boat. The rather quirky design appealed to me as it's unusual, and not readily available in the UK. The kit is mainly laser cut wood, and there is a nice looking set of fittings to go with it. Overall, it looks to be a very good quality kit. The only parts that let it down are the running gear. It has a prop tube with separate shaft, metal prop & motor mount. However, the motor mount is a non-standard size, the prop tube doesn't have any bushes, the prop is simply glued onto the shaft, and there is no provision for radio gear installation. The rudder has a push rod, but the linkage arm is glued on. So, while the kits has some sort of attempt at making it into a working model, it's not really up to scratch and needs some replacement parts to making it into a proper runner. The model is 1/25 scale, and comes out at 475mm long. It's a nice size - not too big - not too small
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Post by Deleted on May 22, 2008 7:21:34 GMT 1
Looks nice, sort of tempted here by it's looks. Instructions in english or just korean ??
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Post by Mark on May 22, 2008 8:11:45 GMT 1
Mainly pictorial instructions. There is the odd sentence here and there, both in Korean, Japanesse & English
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Post by swanrail on May 22, 2008 12:49:52 GMT 1
looks an interesting model, Mark. A real build, not all covered in bits of brass, and as you say, something to get your teeth into to make fully functional! Keep us posted on its progress, I am interested to see how the planking goes.
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Post by swanrail on May 22, 2008 12:50:57 GMT 1
p.s. take it the original, and not the model, is 7 tons!!!!
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Post by Mark on May 22, 2008 13:02:21 GMT 1
Yeah, the model shoud be about 1 lb if my maths are correct.
The planking is a cheat - it's sheets with laser cuts to represent the planks. Works perfectly at this scale. There are two ply sheets on each side of the hull I think. I'll post some pics as it progresses.
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Post by Achtung!! on May 22, 2008 13:03:11 GMT 1
Thats some heavy wood!
Should be re-starting my Spitfire this weekend (jobs around the house permitting)
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Post by eric on May 22, 2008 17:26:19 GMT 1
Nice kit Mark......genuine fish smell included, or an optional extra?
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Post by Mark on May 22, 2008 23:56:24 GMT 1
Well, I should have a nice set of running gear winging it's way from Cornwall Model Boats. Unfortunately I can't start anything until I get hold of the prop shaft and new rudder stock.
The hull is going to need a bit of modification, so I can make a bit of space for a decent battery pack. There actually isn't much room in the model. I'm just wondering if I can squeeze in a small sound unit and smoke generator.............
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Post by nemesis on May 23, 2008 10:46:48 GMT 1
That's a nice looking kit, Mark. Where are you going to get the 1/25 fish from?
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Post by Mark on May 23, 2008 12:25:09 GMT 1
from a 1/25 fish shop !! Where else
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Post by Mark on May 30, 2008 1:41:09 GMT 1
My little bag of goodies arrived yesterday. A nice shiney M2 prop shaft, Graupner Speed 280 race motor & mount, coupling and rudder stock.
The prop shaft is a bigger diameter than the original, which means I have to open out the slot in the keel and make grooves inteh doublers, but that's not a great problem. Same goes for the rudder stock.
The prop shaft is shorter than the original, so the keel needs a bit of butchery so that I can get to coupling on and also hace some access to apply oil or grease to the top of the shaft. Again, not a great problem, but just needs a little thinking about.
I'm also fitting a proper motor mount, that screws in place so I can remove the motor if necessary. Again, a little modification is needed, but nothing a bit a careful measurement won't cure.
One thing to mention about mounting motors. Although there is a flexible coupling fitted that will allow the motor to be fitted at an angle to the shaft, it is best to get the alighment between the motor and shaft as straight and true as possible. The will reduce any vibration, reduce noise, and also increase the performance of the boat and increase the running time of the batteries. The greater the angle that the coupling drives through, the less the efficiency. If it's in a dead straight line then it just acts like a shaft and almost 100% efficient. I.e. The flexible bit doesn't move If it's working through a big angle, then the flexible bit is moving a lot, and there are losses due to friction in the moving parts.
If you manage to get the motor and shaft in perfect alignment then you wouldn't need a flexible coupling, in theory. In practice perfect alignment is virtually impossible to achieve. Even a very slightly mis-aligned motor would result in vibration and rapid wear of the motor bearings and/or shaft bushes.
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Post by Mark on Jun 8, 2008 13:22:00 GMT 1
Made a bit of progress, got the prop shaft, motor and coupling in, along with a couple of frames. The coupling is a tad larger than it needs to be, but it will work fine. It's one of those where you buy inserts with whatever type of hole you need, so it's easy to get exactly the couling you want. Here is a shot of the overall keel as it is at the moment.
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Post by eric on Jun 9, 2008 7:17:05 GMT 1
Looks like it will be big Mark!
A question, if you are building in the motor at this stage.....can it still be removed in the (unlikely!!) event of it breaking down???
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Post by Deleted on Jun 9, 2008 9:26:15 GMT 1
Looks like it's coming along nicely there.
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