fixing prop shaft and Kort nozzle in a plastic hull

[tuts rawsonParticipant @tutsrawson]

keenoma tug 36 inch long 8 inch wide

[tuts rawsonParticipant @tutsrawson]

on the stern there is a channel for thr prop shaft. but it looks as if i will have to cut out a section to fit the cort nozzle.need advice to seal it back up and make it waterproof , thinking of using p 40 or resin and fibre glass . i have not used plastic hulls before so i am at a loss of where to start. how do i strenghten it. what do i make the bulkheads out of , ply or plasty card . would it be easier to fit a rudder instead of a cort nozzle . can anyone out there help ?

[ashley needhamParticipant @ashleyneedham69188]

Tuts. I have not used a plastic hull before so will refrain from doling out advice on that front, but

on the rudder or kort front, they are two different animals, and if it is a tug you are making, I would persevere with the kort nozzle, Korts give much better thrust and control. BUT a rudder is much easier to fit, and depends really on the amount of control you want and how accurate a model you might want to build

We also need a description of what you are building and where the hull came from….pictures??

Ashley

[ashley needhamParticipant @ashleyneedham69188]

sorry..going blind….read title of thread properly !!!

[TelstarParticipant @telstar]

Hi

http://www.myhobbystore.co.uk/product/18069/keenoma-hull-hulmm1322

Drawings for this tug is available follow this link

Cheers Tom

[MzeeParticipant @mzee]

Hi Tuts,

What plastic is the hull made of? Vacuformed ABS perhaps?

If it is then best adheives are Plastic Epoxy or a mixture of Methyl Ethyl ketone (MEK) and Acetone. Also the good old balas cement glues – the nitrocellulose type – like Durofix (Can one still get this?) or UHU. I have used ABS plastic sheet for other (non-boat) modelling purposes and found that epoxy glass layups will adhere OK providing the ABS is well scuffed and clean (I find polyester glass layups to be too brittle). The epoxy I use is called "Ampreg 22", quite expensive but excellent stuff – don't know if this is only a South African product!

You should be able to get ABS plastic sheet for bulkheads.

Good luck,

Robin

[MzeeParticipant @mzee]

Oops – forgot to mention – good cyanoacrylates are also good adhesives for ABS. Remember, you don't 'glue' ABS, you chemically 'weld' it and so to get a really good bond you need to 'graunch' the two pieces together (gently of course) rather than just place them together.

R

[tuts rawsonParticipant @tutsrawson]

hi everyone thanks for the advice regarding setting prop shaft . in the end i cut out a small square for the prop shaft and rudder , i then fixed them in place using some p 40 and plasti card , then sealed it with fibre glass resin tilting the hull up at an angle so the resin covered the prop shaft and rudder tube . result a very nice weld . i stenthend the hull using 1/4 inch balsa strip round the lip of the hull and 1/2 inch balsa as beams then i laid the deck using plasticard , result .

cheers Tuts

[tuts rawsonParticipant @tutsrawson]

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