Mast base connection question for old longboard

Mast base connection question for old longboard

Post by rod. » Thu, 08 Dec 2005 08:54:00


Hi Group

I have a standard US cup mast base with the threaded rod out the bottom
which has the square nut on the end which all goes in the standard
slot. Sound familar?

As a light wind muck around board I just bought an old Australian made
Tyronsea 370 longboard which has the sliding carriage in the aluminium
track similar to Mistral, I think.

What I would like to know, based on the parts available here:

http://www.hydrodynamix.com/tyronsea.html

Can I just substitute my square deck nut used in my standard mast slot
for the brass connector nut to go in the sliding carriage?( my sliding
carriage has the same fitting as the deck plate shown)

Failing that, could I just get the right sized square nut and use that
in the track to get a non adjustable on the fly connection? I do this
on my 1996 Mistral Screamer II but the longboard track seems wider
requiring a larger nut. Unlike the Screamer, the Tyronsea track doesn't
have a handy flip up end piece to allow the deck nut to be slid into
the track.

Regards,

rod

 
 
 

Mast base connection question for old longboard

Post by Dan Weis » Thu, 08 Dec 2005 11:19:00

Rod:  Your brass base plate will not work (I think) even if it fits
into the hole because you can easily misalign the flanges of the brass
plate with the two pins on the deck plate slide lock.  The reason the
brass connector is "round" is to capture the slide lock regardless of
connector's rotation.

You don't want to disconnect at the worst time.

Why not simply use another base and convert to the Tyronesa system
below the uni.  Very standard procedure, be sure to use red loctite to
secure the bolt into the joint if a new bolt to fit the connector is
required.

-Dan

Quote:

> Hi Group

> I have a standard US cup mast base with the threaded rod out the bottom
> which has the square nut on the end which all goes in the standard
> slot. Sound familar?

> As a light wind muck around board I just bought an old Australian made
> Tyronsea 370 longboard which has the sliding carriage in the aluminium
> track similar to Mistral, I think.

> What I would like to know, based on the parts available here:

> http://www.hydrodynamix.com/tyronsea.html

> Can I just substitute my square deck nut used in my standard mast slot
> for the brass connector nut to go in the sliding carriage?( my sliding
> carriage has the same fitting as the deck plate shown)

> Failing that, could I just get the right sized square nut and use that
> in the track to get a non adjustable on the fly connection? I do this
> on my 1996 Mistral Screamer II but the longboard track seems wider
> requiring a larger nut. Unlike the Screamer, the Tyronsea track doesn't
> have a handy flip up end piece to allow the deck nut to be slid into
> the track.

> Regards,

> rod


 
 
 

Mast base connection question for old longboard

Post by rod. » Thu, 08 Dec 2005 12:30:08

Thanks Dan but now I'm a little confused :-)

My base looks different to the Tyronsea base shown on their site but
essentially they are the same in that they both have a threaded rod
sticking out the bottom.

I was thinking that I could remove my square nut and replace it with
their round brass connector thingy with its grooved sides to go in the
hole between the two pins.

Isn't that what the exploded view of their setup near the bottom of
their page illustrates?

 
 
 

Mast base connection question for old longboard

Post by Jrob » Thu, 08 Dec 2005 14:37:14

So you want to replace the square nut that fits the typical
"finbox-like" mast box for their threadded "knob" that has grooves in
the side that fit the quickrelease thing they have?

The only thing holding this issue up is the thread pitch of your
threadded piece comming out of your uni and the accepted thread
diam/pitch of the tyronsea threaded-knob-thingy.  I think a typical
(like chinook onebolt base or universal threaded extension) is
8mm...depending on how long the threads on yous is compared to the
depth of threads on the knob thing you may have to whack off some
threads...the knob should sit flush with the bottom of the uni.(but
check fit before cutting anything)
J

 
 
 

Mast base connection question for old longboard

Post by rod. » Fri, 09 Dec 2005 04:44:33

Jrobb, that's exactly what I want to do :-)
I didn't think about the thread - metric vs imperial
Pretty sure both are the 8mm

I think there is room below the quick release thing that any extra
length of my
threaded rod can stick out below the bottom of their :threaded knob
thingy)

cheers

 
 
 

Mast base connection question for old longboard

Post by m--newsgu » Mon, 12 Dec 2005 06:32:28

Taking a different approach, after years of messing around with keeping
a 20 year old Mistral mast foot working (my old muckabout board is a
Mistral Superlight), I paid my local shop $40 to install a chinook box.
     I have long since forgot the $40, but the ease with which I put
different rigs on the board causes me to use it more frequently, and
put neighbors and friends on it to play around.
 
 
 

Mast base connection question for old longboard

Post by rod. » Tue, 13 Dec 2005 06:39:51

I have it sorted. I have ordered via email the brass connector and
bottom washer shown on the Australian hydrodynamix website above. They
have been great and have airfreighted it out to New Zealand for the
princely sum of $US5.80. It will just***onto the bottom of my
regular base and will give me the "on the fly" mast position adjustment
that I wanted.
 
 
 

Mast base connection question for old longboard

Post by Jrob » Thu, 15 Dec 2005 15:26:27

Ahhhh, the benevolent Superlight...

I remember my last ride on my super.
Think it was blowing 25kts, I had my 4.7 and was getting thrashed all
over the place.
sailed for bout 2hrs and then hung up the towel.  guy approached me on
the beach and hadn't realized I was out there w/out footstraps and
asked why I didn't have a short board.
My reply was "I'm not sure if I amd quite ready for one."  He said if I
could sail that like I did then I needed a shorty.  And that was the
last time I rode my Superlight...I sure miss that retractable
skeg...made it easy to explore inland tidal creeks and guts of Va...

J