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Mon, 11 Apr 2016 7:20 am BST- Light Rain
5 Day Forecast

Wind 2.0 mph @ 40°
48.0°F/8.89°C Humidity 93% Pressure 29.65 (S)

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The Norfolk Broads Forum / General Chat / Tidal stream at Potter Heigham
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Posted By Discussion Topic: Tidal stream at Potter Heigham

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max
May-05-2010 @ 10:27 PM                           Permalink
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A relative newcomer to the broads with our 20' trailer sailer. We've only got about 1m airdraft, so we've got plenty of room under PH, but I'd prefer to go through against the stream. (Is this sensible?)

Does it even flow both ways? what are the timings for the max & min flows?

Strowager
May-06-2010 @ 8:24 AM                           Permalink
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Mardles sometimes
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Theoreticaly, upriver Tide flow is approx 5 hours of flood, followed by 7 hours of ebb.

The tide tables at the foot of this page show predicted low water times for Potter, based on the predicted times at the sea at Yarmouth.

My liberal use of italics is because many factors can make the actual situation considerably different and very difficult to predict.  Atmospheric pressure, North Sea wind direction, excessive rainfall, can all have a big effect. Often there's no "low" tide there at all ! Smile




This message was edited by Strowager on May-6-10 @ 8:25 AM

billmaxted
May-06-2010 @ 10:14 AM                           Permalink
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It does not really matter much at Potter winds if anything are more likely to effect you.

Bill...(The Ancient Mardler)

steve-king
May-06-2010 @ 1:17 PM                           Permalink
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Hi,

FWIW, my preference is always against the tide when I can. A decent bit of speed through the water helps control no end (particularly in the case of a sterndrive or outboard).

I take a dayboat through quite often (a couple of times a month), but there are plenty of others on the forum with much more experience who might wish to over-rule me!

Wind can be an issue for motor boats, but if your air draught is just 1m, I would think it should not be too much of a problem for you.

Good luck!

Steve

BroadAmbition
May-09-2010 @ 8:34 AM                           Permalink
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Unless of the saily type, the wind is very rarely a problem as it is advisable to have a bit of revs on to shoot the bridge, tide is rarely an issue when going through either, I have seen dinghy's struggle to row through it against tide though.

The biggest issue for most of us of course is height and air draft.


Griff

'Broad Ambition' - 'Dreams do come true' - Afloat at last 06-10-07

www.grifftile.co.uk

Strowager
May-09-2010 @ 12:41 PM                           Permalink
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Mardles sometimes
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I think Max is quite sensible to prefer to go against the tide stream in tight places like under Potter Bridge.

Even with just a 1 mph current, a 3 mph (steerage way) speed through the water would give a relative speed "through the hole" of either 4mph or 2mph.

I'd much rather be doing the lesser when things are tight !  Smile  

zacthedog
May-09-2010 @ 10:02 PM                           Permalink
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Mardles sometimes
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i think i am also right in saying that the faster you go (for a short burst ) the lower you are in the water, knotts not mph, does the prop pull you into the water, so going against the flow would allow a higher rate of thrust then a lower airdraft?
also Griff has a problem with wind- tell us something new boat-sail LOL

Gary
1hr 30mins 60mls away
forum girly swot 19/3/2010

This message was edited by zacthedog on May-9-10 @ 10:05 PM

Strowager
May-09-2010 @ 10:41 PM                           Permalink
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Mardles sometimes
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sort of....

One of the Martham Boats pilots told me a while ago that once a large hulled cruiser is half way through, a burst of revs sucks the water from beneath the boat (while it's in the restricted "hole" under the arch), lowering the stern by an inch or two.  Smile

(normally higher revs would lift a boat in the water, at least at the bows, anyway).

This message was edited by Strowager on May-9-10 @ 10:45 PM

expilot
May-09-2010 @ 11:17 PM                           Permalink
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I wonder why a Martham boat would even consider doing such a thing - even if it worked - given that the heighest/widest point of all Martham boats is the centre cockpit sides?  The fact that the original post was reference to a boat with a three foot three inch air draft would make such a procedure totally unecessary.
Smile

Dom't you just love experts. Wink

"There are old pilots.  There are bold pilots............."

BOATERS
May-09-2010 @ 11:34 PM                           Permalink
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Slightly off post,sorry,but have the chances of seeing 6ft 8ins been possible of late and has the fee changed from last year ,assuming you are lucky enough to get through ?

Roy and Diane

Hope to see you on the river,

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