Hi,

I am looking to make a short hinged mast for a radar aerial from
aluminium tube for an inland waterways vessel. The aerial weighs 4.6
kg and mounts on a plate 210mm x 210mm. Was thinking of using a 1 1/4
inch 16 gauge aluminium tube, with a flat 10mm plate welded across the
top. Total mast length around 2.5m, with approx 1.25m above the
pivot.
Grateful for any thoughts.

TVMIA

I think 10 pounds atop a 4 foot pole that is only 1 1/4 inches will sway and
vibrate a lot. Probably crack the welds after a while. All the movement
will also mess up the radar image. If you braced it with guy wires it might
be OK.
Most of the commercial radar poles are 2 1/2 to 3 inch tubing. Do a search
on garhauer radar pole and edson radar pole. Even these use braces going to
the stern rails.

"Rob" wrote in message
om...
Hi,

I am looking to make a short hinged mast for a radar aerial from
aluminium tube for an inland waterways vessel. The aerial weighs 4.6
kg and mounts on a plate 210mm x 210mm. Was thinking of using a 1 1/4
inch 16 gauge aluminium tube, with a flat 10mm plate welded across the
top. Total mast length around 2.5m, with approx 1.25m above the
pivot.
Grateful for any thoughts.

TVMIA

Suggest you look at this web page to purchase a radar base mount

http://www.craysidemarine.co.uk/ click on the Specials menu and look for
"stainless"

It shows a picture of a base but I know he will make one similar for you

Regards

Dave


"Rob" wrote in message
om...
Hi,

I am looking to make a short hinged mast for a radar aerial from
aluminium tube for an inland waterways vessel. The aerial weighs 4.6
kg and mounts on a plate 210mm x 210mm. Was thinking of using a 1 1/4
inch 16 gauge aluminium tube, with a flat 10mm plate welded across the
top. Total mast length around 2.5m, with approx 1.25m above the
pivot.
Grateful for any thoughts.

TVMIA

"Gordon Wedman" wrote in message news:peVhc.3479$mP2.1092@edtnps89...
I think 10 pounds atop a 4 foot pole that is only 1 1/4 inches will sway and
vibrate a lot. Probably crack the welds after a while. All the movement
will also mess up the radar image. If you braced it with guy wires it might
be OK.
Most of the commercial radar poles are 2 1/2 to 3 inch tubing. Do a search
on garhauer radar pole and edson radar pole. Even these use braces going to
the stern rails.

Thanks - now I recall picking up a 3inch spinnaker boom which I
should be able to use and should be strong enough.

Even if te radar gizmo weighs nothing, is the mast in a position where it
could be used as a handhold/leaning post?. If so, it'll need to be quite
robust.

Rob wrote:

Hi,

I am looking to make a short hinged mast for a radar aerial from
aluminium tube for an inland waterways vessel. The aerial weighs 4.6
kg and mounts on a plate 210mm x 210mm. Was thinking of using a 1 1/4
inch 16 gauge aluminium tube, with a flat 10mm plate welded across the
top. Total mast length around 2.5m, with approx 1.25m above the
pivot.
Grateful for any thoughts.

TVMIA

On Mon, 26 Apr 2004 20:56:12 +0100, Peter Keating
wrote:

Why do you need a radar for an inland waterways boat anyway, I'm
surprised
nobody else has asked this fundamental queston.snip

rain, fog, darkness.
rick

Why do you need a radar for an inland waterways boat anyway, I'm surprised
nobody else has asked this fundamental queston. Peter
"Jim Conlin" wrote in message
...
Even if te radar gizmo weighs nothing, is the mast in a position where it
could be used as a handhold/leaning post?. If so, it'll need to be quite
robust.

Rob wrote:

Hi,

I am looking to make a short hinged mast for a radar aerial from
aluminium tube for an inland waterways vessel. The aerial weighs 4.6
kg and mounts on a plate 210mm x 210mm. Was thinking of using a 1 1/4
inch 16 gauge aluminium tube, with a flat 10mm plate welded across the
top. Total mast length around 2.5m, with approx 1.25m above the
pivot.
Grateful for any thoughts.

TVMIA

Peter Keating asks:

Why do you need a radar for an inland waterways boat anyway,

For the same reason people feel a need to drive a Hummer around town to get
groceries?

Just a thought.....

Steve

Doh!

Funny enough there are a few thousand of us that keep our boats on Inland
Waterways because thats near where we live, BUT we choose to take them to
sea for holidays.

In the last couple of years, we have visited Holland, Belgium, France and
the East Coast of England from a base at Bray near Maidenhead.

Mike

"Peter Keating" wrote in message
...
Why do you need a radar for an inland waterways boat anyway, I'm surprised
nobody else has asked this fundamental queston. Peter
"Jim Conlin" wrote in message
...
Even if te radar gizmo weighs nothing, is the mast in a position where
it
could be used as a handhold/leaning post?. If so, it'll need to be
quite
robust.

Rob wrote:

Hi,

I am looking to make a short hinged mast for a radar aerial from
aluminium tube for an inland waterways vessel. The aerial weighs 4.6
kg and mounts on a plate 210mm x 210mm. Was thinking of using a 1 1/4
inch 16 gauge aluminium tube, with a flat 10mm plate welded across the
top. Total mast length around 2.5m, with approx 1.25m above the
pivot.
Grateful for any thoughts.

TVMIA

Foggy and lots of traffic?

--
http://www.advantagecomposites.com/tongass -- My 22' Tolman Skiff project
http://www.advantagecomposites.com/catalog -- Discounted System Three
Resins products


..
"Stephen Baker" wrote in message
...
Peter Keating asks:

Why do you need a radar for an inland waterways boat anyway,

For the same reason people feel a need to drive a Hummer around town to
get
groceries?

Just a thought.....

Steve