Air Draft?
Printed From: myHanse.com
Category: Hints & Tips
Forum Name: 371
Forum Description: 371 Hints and Tips
URL: https://www.myhanse.com/forum_posts.asp?TID=1274
Printed Date: 27 March 2026 at 03:41
Software Version: Web Wiz Forums 12.06 - https://www.webwizforums.com
Topic: Air Draft?
Posted By: 371-#122
Subject: Air Draft?
Date Posted: 15 May 2007 at 12:48
| Does anyone know the bridge clearance height of the 371? There is a 56 foot (17 meter) bridge in Miami that I would be interested to know if I could clear. |
Replies:
Posted By: marcust
Date Posted: 15 May 2007 at 15:37
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According to the brochure I = 15.05m. I is deck to head of mast. Distance from waterline to deck is less than 2 m. But not much left over. It'll be close! Dimensions in: http://hanseyachts.co.uk/pdf/2005-07-21_141159.pdf ------------- Marcus Tettmar http://www.mjtnet.com/" rel="nofollow - Macro Recorder & Windows Automation Tools. Automate your business so YOU can go sailing. We'll show you how. |
Posted By: 371-#235
Date Posted: 15 May 2007 at 15:57
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Tom,
I use an airdraft number of 58 feet. The 56 foot bridge clearance you describe would be touch and go. You might loose your VHF antenna and windex.
Bob, 371-#235
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Posted By: elisabel
Date Posted: 15 May 2007 at 20:17
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Inclusive a mounted VHF- antenna you need 18 meters. Think of the moving water surface and the changing waterline.
Dietmar
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Posted By: Alex Faber
Date Posted: 15 May 2007 at 20:37
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Please be careful, IMHO the "I" is the distance from deck till the fixing point of the forstay at the mast. ------------- s/y eMotion (H430e #24) |
Posted By: Johan Hackman
Date Posted: 16 May 2007 at 09:36
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I reckon the top of my 1 metre VHF antenna is 17 metres above the water surface on my 342. I don't go under bridges stated less than 17 metres in Swedish Charts.
Johan -------------  http://www.johanhackman.se" rel="nofollow - http://www.johanhackman.se |
Posted By: PekkaL
Date Posted: 20 May 2007 at 19:51
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I believe Hanse documentation mentions 17,3 metres. I assume this is without Windex or any other instrumentation ... I would not go under a bridge lower than 18m. PekkaL ------------- Pekka Leppanen, "Vedette" |
Posted By: Johan Hackman
Date Posted: 20 May 2007 at 22:52
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Or call the bridge on the VHF and ask for an opening...
Johan  ------------- http://www.johanhackman.se" rel="nofollow - http://www.johanhackman.se |
Posted By: Hanseat
Date Posted: 21 May 2007 at 07:29
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The hight over the water might be 17,40m close by 60ft. But be aware of the waterlevel. The level changes daily. I agree with Johan, you should call the bridge on VHF to get the clearance of the day you want to pass the bridgde. :-) Sailing close to the wind will bring you enough space..... so long Thomas |
Posted By: 371-#122
Date Posted: 21 May 2007 at 15:27
|
Thanks all for the assistance.
The bridge I am interested in is the Julia W Tutle bridge in Miami, Florida, with a fixed clearance of 56 feet at Mean High Water. Since it is fixed, there is no bridge tender.
Most bridges on the Intracoastal Waterway are either 65 feet, or are opening.
The reason why I am interested in this bridge, is my choice is either go down the ICW, or go outside on the coast. Going outside, I am fighting an average 3.5 knot current due to the Gulfstream, on a 90 mile trip. Planning on a 5.5 knot average speed through the water, results in a 45 hour passage down, as opposed to roughly 16 hours if I motor in the waterway. (Of course, the ten hour trip back on the outside is fun!)
Bridge tenders in Florida will not tell you the clearance (due to liability). Once again, proof that the US has too many lawyers!
Tom
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Posted By: Brightside
Date Posted: 21 May 2007 at 17:10
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Hi.
Why not measure it? We have a 30m/100' tape measure onboard which cost less than £10 ($15) and it has paid for itself many times over by measuring accurately the required length of ropes etc. I would suggest you attach a downhaul to the main halyard rather than trust the tape and the end fixing. A friend used the tape to measure his mast before a trip to Holland where fixed bridges were to be encounted, he felt much better at having an 'accurate estimate'. Regards Mike |