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PostPosted: Fri Aug 14, 2020 7:46 am 
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Joined: Thu May 23, 2013 12:02 am
Posts: 165
Location: London
Hi Gang,
Wasn't sure whether to split this into three topics but decided to dump it all in one post, I can be split it if preferred.
I am based in the UK and as such Hobie parts are expensive when taking into account shipping costs from the US and customs import taxes.

Hobie 14 Turbo restoration.
1) 3d printed swivel base (Mainsheet)
2) Mast base and step conversion to Hobie Wave ball type. (Home turned ball)
3) Homemade Vinyl Trampoline

Initial Condition, cutting away plantation:
Image

1) 3d Printed swivel pad

Knocked up a design in Autodesk Fusion360.

Printing on Delta printer in PETG for strength.
Image

Note: I used a trick an old timer engineer taught me many years ago for precisely measuring contours, such as that used for the rear beam.
I'll try to explain it here as can't find a picture as it could come in useful.
Cut out a rectangle of corrugated cardboard and stick a bunch of those wooden cocktail sticks between the outer layers along its length but not completely embedded.
Level the stick out against a table, then press the stick against the form you wish to copy.
Lay card with sticks flat to paper and trace out the end of the sticks. Works great for non uniform curves. Hope that made sense.

Image

Image

2) Converting mast base and step (70's version limited rake) to ball so as to provide greater rake.
Original:
Image

Ball Step, the ball itself was turned on my metal lathe employing delrin and a homebuilt ball turning attachment.
The front screw is temporary as it was all I had at hand, will swap for an engineering bolt or cap screw.
The screw was required as there was a hole in the spot too large for the rivet.
opened and cleaned up hole squeezed in a Rivnut to accept screw.
Old holes to be filled.
Image

Old and new mast base
Image

Riveting mast base.
The blue material is a piece of nitrile glove, thought behind this was to aid in sealing rivet along with galvanic isolation, not sure if it will be useful. :shrug:
Image


3) Homemade H14turbo trampoline (Warning: Its not pretty but is functional)

Confession:
Started out with older H16 vinyl tramp that had crumbling UV deteriorated thread and corroded eyelets but material was sound.
Used the old stiff H14T tramp as template.

Reads Sailmaker Sewing Machine:
Image

Shortening the H16 tramp to match H14, added supporting vinyl and webbing between layers for extra strength, eyelets to be punched.
Image
Image

Homemade punch turned on lathe and new spur grommet inserted:

Image

I said it wasn't pretty, had major issues with sewing machine and the fact of having only two hands ;-)
Image

Image

In the absence of large spur grommets for Jib becket blocks,
turned my own on the lathe from 40mm Delrin / Acetal rod,
they are then sewn into the top and bottom of the trampoline with twine.

Bored and drilled prior to parting into four section pieces.
Image
They can be seen located and sewn into tramp.
Image

Trampoline on the boat, hiking straps sewn on, guess it doesn't look to bad from a distance ;-)

Image

_________________
Hobie 14 Turbo (~1979)
Hobie 16 Carumba (1983)
Hobie 16 1990 (storm damaged)
Hobie 16 1996 (my latest)


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PostPosted: Fri Aug 14, 2020 4:10 pm 
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Site Rank - Old Salt

Joined: Mon Dec 22, 2008 7:02 pm
Posts: 590
Location: Rockford, IL
That's great! Amazing solution, I love the hand crafted ball and mast system upgrade.

_________________
Yet another Bob!
"Firefly" - 2012 Hobie Getaway with wings and spinnaker
"Sparky" - 1978 Sunfish (OK, it's not a Hobie, but it's a fun little craft)
Too many canoes and kayaks


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PostPosted: Tue Aug 18, 2020 5:45 pm 
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Site Rank - Admiral

Joined: Thu May 23, 2013 12:02 am
Posts: 165
Location: London
Thanks Dorienc, appreciate your reply.
Will update further when I have a chance to get to the boat next.

One thing I do need to do is reseal (Sikaflex) one of the front ports however I was having a hell of job unscrewing the perimeter screws.
The previous owner used long pan head engineering screws, one would normally expect a nut / washer to be attached to such screws but this is not the case. The screws just keep spinning in place even when applying fair degree of pressure to the bottom of them. :o

_________________
Hobie 14 Turbo (~1979)
Hobie 16 Carumba (1983)
Hobie 16 1990 (storm damaged)
Hobie 16 1996 (my latest)


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PostPosted: Wed Aug 19, 2020 3:26 am 
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Joined: Mon May 24, 2004 10:33 am
Posts: 609
Location: Clinton, Mississippi
Sir, you are a mariner of infinite resource and sagacity!

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Jerome Vaughan
Hobie 16


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