Leighb
Well-Known Member
What is your air draft then? 58 feet seems a lot?
Bridges over troubled waters.
- Thread starter toyboy
- Start date
What is your air draft then? 58 feet seems a lot?
Lucky Duck
Well-Known Member
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xyachtdave
Well-Known Member
Good choice of boat!
CCJ
Well-Known Member
is the mast keel stepped
Hadenough
Well-Known Member
And?
CCJ
Well-Known Member
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PeterWright
Well-Known Member
If your 34 footer has an air draft exceeding 59 feet, she has an unusually high aspect ratio rig and can hardly be described as "rather modest".
I for one will be sorry if the new crossing means that sailing barges can no longer access the wet dock without housing their top masts - it doesn't seem a lot to ask that the new crossings should not reduce the available air draft to less than is currently available under the existing Orwell bridge. However arguments for that are only weakened by exaggeration of the potential difficulties.
While I believe that progress is inevitable, I also think that all reasonably practicable steps should be taken to minimise the problems created by that progress.
Peter.
Peter
toyboy
Well-Known Member
Barges will no longer be able to reach St. Peter's Port if the bridge across the New Cut is built. In fact very little will get underneath it.
PeterWright
Well-Known Member
When did you last see a sailing barge up the New Cut? The barge masters I know would sooner lock in to the Wet Dock than risk drying out on a foul bottom up the Cut.
Peter.
dennyjc
Well-Known Member
How annoying -
We are 17.4m plus VHF antenna . . . . or so the paperwork says
I'm going to have to find a way of measuring it now
(and not impirically - by hitting the bridge)
Many in the Ipswich marinas will be taller.
Lucky Duck
Well-Known Member
I recall the owner's manual gives the air draft as 17.5m and it's not impossible that the mainsail luff lower measurement band is approaching three meters from the waterline.
Happy enough to go over the tidemill's cill with a couple of cm to spare but I'm more circumspect when it comes to the top of the mast and bridges or power lines!
Lucky Duck
Well-Known Member
This says a little less http://www.maxisidorna.com/maxi/data/en/27
I guess sending a tape measure attached to halyard up the mast might be cheaper than a try it and see approach.
It may just be me but when going under the Orwell bridge the gap between the mast and the underside of the bridge looks a lot smaller than it really is
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PeterWright
Well-Known Member
For a bridge, centimetres of clearance will suffice but for power lines (may be as much as 400kV in the UK) you need metres to be safe. The mainsail band height is of little relevance if you use the I dimension, the lower end of that is where the line of the mast intersects the main deck i.e. below the top of the coachroof. Of course, at the top end, you need to add the height from the top of the highest headsail halyard sheave to the mast cap and any antenna above the cap and at the bottom end, the height of the main deck at the mast above the waterline. I keep a conservative measurement of our air draft in Wild Thyme's log flysheet, it's 18.3 m.
Peter.
dennyjc
Well-Known Member
Thanks for the URL but......it doesn't seem to work for me.
The Maxi 1100 changed specifications during its production life.
I guess I'm using the most pessimistic figure that I've found.
As you say a tape up the mast may do it
(or finding a birth near a high building)
Lucky Duck
Well-Known Member
Stopped working for me also - very odd, it was the second "hit" when I typed maxi 1100 specification into Google.
We were rafted off a 1100 last Easter, I think our mast was slightly taller...
I have known people use Ramsgate harbour walls to access thier mast head when they ran out of halyards
We were rafted off a 1100 last Easter, I think our mast was slightly taller...
I have known people use Ramsgate harbour walls to access thier mast head when they ran out of halyards
Tomahawk
Well-Known Member
18m clear under a lifting span? WTF for?
My stick is about 156m tall and starts 2m from water level ..
Then I have a couple of ariels on top. I will always be arriving around HW after coming up from the Crouch.
Someone go figure?
Lucky Duck
Well-Known Member
When heading to/or arriving from the Blackwater or the Crouch I would aim to be at Pye End around local LW.
MoodySabre
Well-Known Member
I once went under the Zeelandbruge when the electronic indicator was showing 15.6 m clearance. Mr air draft is 14.5m. I would never do it again - it was beyond scary.
PeterWright
Well-Known Member
+1 for that rule of thumb, except that Pye End is so good at hiding in the chop that seems to prevail in these waters that we have low water at Stone Banks as the rule for any passage from the south to Harwich or vice versa.
Peter
toyboy
Well-Known Member
There is a residential barge in the New Cut and it has been there for ages. As for St. Peter's Port, the maritime trust want access for barges such as Victor.