Ship Item Dimensions topic

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[The Ferry Man]

Hi Guys,

been wondering, does anyone know how wide a radar beam thingy (very technical term :p) is on a ferry?

(The part that goes round)

Also, any ideas how wide the radar Mast itself is?

Many Thanks

TFM

[vin_sun]

how wide a radar beam thingy
(The part that goes round)

The "thingy"  is called a scanner. It could be almost 7 feet long

Also, any ideas how wide the radar Mast itself is?

Wide or tall

[The Ferry Man]

Ahh Thanks

the width, ie if you measured the mast from its portside to its starboard

[vin_sun]

the width, ie if you measured the mast from its portside to its starboard

The "wings" of a radar mast would extend to about 6 feet on each side of the mast.

[The Ferry Man]

Ahh thanks

What about just the mast itself I know they usually taper inwards

Have attached a pic, not great as the mast isn't quite head on

[vin_sun]

That part near the arrows in your picture would be anything from 1 ~ 1.5 metres.

Radar masts do have a broad base and then taper towards the top. The broad base (in the fore and aft orientation) gives a good foundation. These masts often have a curved front. It could be a design feature to offer less resistance to wind. On cruise liners the design is more to match with the general profile of the ship and may be a bit wider too. It also matters as to what it has to support - radar scanners, various antennae, signal lights, main navigation light and arms for flag halyards. Radar scanners are placed as high as possible to ensure no 'shadows' are created on the radar screen in the wheelhouse below. It is for this reason most radar masts are designed to be taller than the funnel. It is also a common feature to see the mast being supported by wire stays.

[The Ferry Man]

OK

Thanks very much

[The Ferry Man]

OK another dimension

now for my passenger decks I always go for 2.2m high? but is this too high? Looking around the average person is about 1.7-18m tall, so that's 40cm of clearance

I also give the deck thickness as 60cm for pax decks, and 80cm for car decks, does this seem reasonable?

Thanks

[vin_sun]

The deck height seems to be OK as it's about 7 feet. But the deck thickness of 60 to 80 cms is rather too thick. The steel deck is 1 cm thick and this is later covered with certain composition and then tiled. Max thickness would be about 7 cms.

[Traddles]

Hi Guys,

been wondering, does anyone know how wide a radar beam thingy (very technical term :p) is on a ferry?

(The part that goes round)

Hi TFM,
The width of a radar scanner depends largely on whether the radar is a 3cm or 10cm model. A scanner for 10cm radar is a great deal wider than a 3cm one. You will note on vin_suns picture above that there are three scanners, the lower two are, I would think, 3cm scanners and the top one a 10cm scanner. The 3cm & 10cm refer to the wavelength of the radar beam. The following gives details:- http://books.google.co.uk/books?id=ifEYsDQuj4QC&pg=PA425&lpg=PA425&dq=3cm+%26+10cm+radar&source=bl&ots=Ap0oRS2vip&sig=quQ2v82BrB_Q2nYKWPYVBeguWy4&hl=en&sa=X&ei=K00ZT7z1JsKeOuCrwa4L&sqi=2&ved=0CDkQ6AEwAw#v=onepage&q=3cm%20%26%2010cm%20radar&f=false

Traddles.

[The Ferry Man]

Ahh OK thanks for that useful info Traddles 

With the deck spacing what I was going from is from pictures, but it can be hard to tell

the vehicle deck I go from the thickness of the cow catchers:



Which as you can see are pretty thick.

The pax decks are harder though, because if you look they look thick



But if you then get it from a certain angle:



the thickness is just the edge

Thanks

[clanky]

The actuall steel thickness would normally be in the region of 10mm for pax decks and 15mm for vehicle decks, but they would be stiffened with frames underneath to a total thickness of anything up to 450 mm for the vehicle decks and 300mm for pax decks.

Normally the transverse frames would be spaced at something like 600 - 800mm apart with a major frame every 5th frame at the dimensions quoted above and slightly lighter frames in between, there would also usually be longitudinal frames of lighter construction.

I would try and find you some pictures, but internet connection onboard is rubbish.

[The Ferry Man]

Ahh I see

Thanks very much for the explnation 

[vin_sun]

What you have marked is bulwarks to some extent. A part of it extends above the deck which it is welded to and the other part extends below.

[The Ferry Man]

Ahh I see

thanks 

[Captain Cadet]

depends on the make and model.
my uncals got one thats about 1 foot long,
the boat i was on reasently had a 4 foot one.
and the Stena has about a 7 foot (i guess  )
you may want to google it