Model Boat Mayhem

Mess Deck: General Section => Model Boating => Topic started by: Sandy on March 15, 2011, 10:59:08 pm

Title: Building a hull from styrene
Post by: Sandy on March 15, 2011, 10:59:08 pm

Hi,

How easy would it be to build a hull from styrene sheet?

The boat is a small car ferry and the model size would be about 40 inches in length. Most hull surfaces are flat, although there is a strange curve at each end.

Any advice on styrene thickness, and whether the keel can be of styrene or maybe ply would be better. Lightness is a factor here, as there is quite a bit of ship above water and not much below.

Any advice, photos appreciated.

Thanks in advance.

Sandy

P.S. How do you go about sealing it to stop water getting in ? ( I guess this could be important)

Title: Re: Building a hull from styrene
Post by: andrewh on March 15, 2011, 11:26:46 pm

Sandy

Good plan - quite straightforward :}

Don't know if you have any access to old "comics", but Ricky Webb published many boats made of Styrene, with detailed instructions on each of them
Basically it goes like this:
Get styrene sheet - about 1.6mm thick (this is sold in HUGE sheets by plastics suppliers as HIPS sheet)
Cut templates in card - mark round on sheet and cut out (score about half the thickness and bend to snap sheet)
Assemble sheets together - I use pvc (insulating) tape; Ricky preferreed masking tape

(http://i222.photobucket.com/albums/dd159/andrewh_photo/Footys/RAV%20the%20Razor/razorfooty2sm.jpg)

Use one of the solvent cements applied with a small (cheap) paintbrush - the cement is so thin it will run into the joint
Leave overnight to harden
(http://i222.photobucket.com/albums/dd159/andrewh_photo/Footys/RAV%20the%20Razor/razorfooty5sm.jpg)
Remove tape and make sure all joints are glued (do not worry about any gaps)
Add Transoms, and any other internal bits
(http://i222.photobucket.com/albums/dd159/andrewh_photo/Footys/RAV%20the%20Razor/razorfooty7sm.jpg)
 Add deck in similar way

GAPS - Ricky method - it has never really worked for me
put a puddle of solvent cement into an airtight jar (this is what the marmalade jars from hotel breakfasts are for :}), add small bits of styrene offcuts, leave for an hour and adjust to creamy consistency
brush onto inside of seams and use to fill small gaps - put slices of styrene offcuts in and leave for an hour (top on!)
Adjust to milky consistency and brush into all joints (on the inside)
fill larger gaps with slivers of styrene

(http://i222.photobucket.com/albums/dd159/andrewh_photo/Footys/RAV%20the%20Razor/DSC01790.jpg)
I used car body filler and squeezed a round fillet into all the seams

Ask if you need any specific help
andrew

Title: Re: Building a hull from styrene
Post by: Shipmate60 on March 16, 2011, 12:16:38 am

For a flat sided hull of 40 inches you will need some stiffening like a keel and bulkheads or will need to use very thick styrene.

Bob