Drying out alongside in an MG30
Tony - Santana
cruising for August - this year the English south west coast and,
weather permitting, the Scilly Islands.
Something I have never done is to dry out over low tide alongside a
harbour wall, although I have seen others do it. I imagine lots of
fenders are essential, and it would seem important to me to ensure
that the boat lies into the quay a bit - perhaps I would take the main
halyard ashore to cant the boat over slightly. I imagine the long
keel of an MG30 would provide enough fore-aft stability. The trouble
is, once embarked on, there is no way out of seeing it through.
Does anyone on this list have experience of this? And how critical is
the bottom? Soft mud would not be good. Some ports are described as
hard. Sand might be uneven. And what about stones? Any advice/
experience would be welcomed.
Happy sailing - Tony
Boudewijn
I did this a few times, always in soft sand (Waddenzee).
The mid-point of the keel/ground contactline is imo behind the center of
gravity. I agree on hard soil the boat stays upright, but in softer soil
she tries to dip forward. So I extend the halyard, attach it backwards
on the quai, and tension it with the winch as soon as the bottom is hit.
For lateral forces I use the mooring lines mooring lines. You have to be
standby when the boat hits bottom. My halyard top construction would not
like lateral forces. If the quai is too high I would connect to mast
near the spreaders.
I have a "riding plank" (literal translation from Dutch), a plank, hung
between the quai and two or more fenders.
mvg Boudewijn
Tony - Santana schreef:
Graham & Judith Kirkpatrick
Glad to hear from you and the others.
I agree that the MG30 sits quite happily on her cutaway keel but has a
tendency to drop her bow, the amount depending how soft the bottom is. I
wouldn't worry about damge to the keel as it is strong and can usually cope
with a stony bottom as long as the the bottom isn't littered with individual
rocks. As Doug says the keel is very strong and my boat sits on her trailer
with the weight mainly being taken by the front of the keel.
I find a good tip is to lean the boat into the wall by standing a couple of
5 gallon containers full of water on the side deck nearest the wall.
Alternatively lie your anchor chain along that deck. Be careful, however, to
not lean it too far or you may foul the spreaders as she settles. Long bow &
stern lines should keep her upright and you could also tie a strong warp
from the offside toerail accross the coach roof & up to the harbour wall
tensioning it as soon as he has settled on the bottom.
My boat generally lies afloat against pontoons in the marina but when work
was being done to repair the marina gate she sat upright in the soft mud
quite happily at low tide for several weeks without actually dropping her
bow.
Have a good trip,
Graham
TSAYOT
paul chapman
Hi Tony and all others taking part,
Here are two pictures of "Grampus" in the predicament!
We stopped at Ilfracombe in the Bristol Channel, originally in the place
where the UFO34 is astern, we sat there
superbly, then moved forward, found a soft pocket of sand and hey presto. No
damage bar to pride and the poor nights sleep.
We had the anchor chain aft along inner side deck, cans of water fuel etc in
cockpit, all the lines in all the directions but could not stop it
happening.
I am now making legs for these occasions. I think that a leg on the outer
side with the bow well in against the wall will be the most secure, but we
will see one day. The keel on our beloved MG's are not really that long, she
has a grand under water profile but the design guarantees some upwind
performance also, like all things it's a compromise, that's my feeling
anyway.
Good to see some life on the site, I hope it may long continue. Any one
visiting the upper reaches of the Bristol Channel will be made most welcome.
Best regards all,
Paul Chapman.
Subject: [MG30] Re: Drying out alongside in an MG30
--------------------------------------------------------------------------------
No virus found in this incoming message.
Checked by AVG - www.avg.com
Version: 8.5.392 / Virus Database: 270.13.21/2252 - Release Date: 07/21/09
05:58:00
BRIAN MCCOMBE
Hi Tony,its Brian from "White Heather " make sure you have plenty of fenders
and move some wieght to the wharf side,make sure you take a halyard from the
top of the mast to rake you an angle to the quay(it will hold there if you
have not got the rake right)remeber to ease it as t6he tide comes in ????
Best of luck Brian Port Edgar |
Boudewijn
halyard goes from masttop *backwards* to the quai.
The soil may be mud, like in Rye where I sunk in practically straight down.
Or rock where the boat *just* stays upright, because the toe of the keel
sole takes all weight.
Paul had halfway firm sand: the toe was pressed into the sand, and the
heel actually lifted from the bottom, see pic xxx003!
An order of magnitude estimate for maximum forward momentum is 4500 kg *
1 m (half of the keelsole). The halyard should then do 15 m * 300 kg
backwards!
The front mooring line would risk pulling the cleat out of the deck, 5 m
* 900 kg, and nasty angles.
I experienced in Waddenzee sand something like 50 kg on on this backward
halyard. Just the normal sail hoisting tension. And thought it was a
bit of an unneccesary precaution. The guy drying out behind me
complained a bit about the halyard extension.
But these picture opened my eyes! Thanks Paul.
And if you use a sideways "halyard" for lean to, it should be a separate
one.
mvg Boudewijn
BRIAN MCCOMBE schreef:
Tony Voss
the top of the mast will translate into, say 5m * 900kg up the
forestay.
Any idea if the forestay and bow plate would cope with that?
Tony
Boudewijn
My fore and aft stays are 10 mm dia, good for 3000 kg * 2 safety factor.
Hull and mastfittings should match that.
The safety factor is for dynamic loading under sail and waves, not
needed for occasionally keeping the boat upright.
When sailing to windward in force 4 there is something like
50 kg/m2 * 30 m2 = 1500 kg force working on the sails.
I was a bit concerned about the sideways forces (much smaller of course)
some where recommending to make the boat lean into the quai: My mast has
integral (sheaves(?)) with steel halyards. If the steel halyard is bent
to point sideways it will kink and might be damaged.
Anyway on the average quai there will be no room for halyards pointing
sideways. Certainly not on Pauls pictures.
I am not sure I have the right Dutch-English translation for the words
with ?marks.
regards Boudewijn
Tony Voss schreef:
>
> Helpful and well worked out comments, Boudewijn. That 15m * 300kg on
> the top of the mast will translate into, say 5m * 900kg up the forestay.
> Any idea if the forestay and bow plate would cope with that?
>
> Tony
>
>
>> yes, but if you look at the pictures of Paul Chapman the important
>> halyard goes from masttop *backwards* to the quai.
>> The soil may be mud, like in Rye where I sunk in practically straight
>> down.
>> Or rock where the boat *just* stays upright, because the toe of the
>> keel sole takes all weight.
>> Paul had halfway firm sand: the toe was pressed into the sand, and the
>> heel actually lifted from the bottom, see pic xxx003!
>>
>> An order of magnitude estimate for maximum forward momentum is 4500 kg
>> * 1 m (half of the keelsole). The halyard should then do 15 m * 300 kg
>> backwards!
>> The front mooring line would risk pulling the cleat out of the deck, 5
>> m * 900 kg, and nasty angles.
>>
>> I experienced in Waddenzee sand something like 50 kg on on this
>> backward halyard. Just the normal sail hoisting tension. And thought
>> it was a bit of an unneccesary precaution. The guy drying out behind
>> me complained a bit about the halyard extension.
>> But these pictures opened my eyes! Thanks Paul.
Graham & Judith Kirkpatrick
Re leading halyard to Quay & risk to halyard at exit point on mast head.
How about a 16mm dockline looped around the mast then pulling the loop up to
the underside of the spreader bracket with a halyard. The dockline could be
taken to the Quay wall abeam of the boat just before she touched bottom and
loosely tied off and the halyard freed off. allowing the loop on the mast
to drop. A halyard end from the mast heel also tied to the loop could used
to pull the loop down with a winch to tension the dockline as she settled.
The loop would have to be loose enough to shake down from the mast when
finished with. Fiddly I know but would avoid damage to halyards.
Incidently my MG30 has 6mm standing rigging all round and I was surprised to
hear Boudewijn had 10mm! Should I be worried?
Finally my MG30 has a a two bladed sailing prop 13.5" x11" which I feel is
too fine. I've been assured my 16hp twin cylinder diesel engine would turn a
three bladed coarser pitch prop. What sort of prop do others have?
Regards,
Graham
TSAYOT
BRIAN MCCOMBE
Hi all,"White heather " based at Port Edgar has a three bladed prop and is
raced each week in Div 2 ,I allow the prop to spin free when racing ,beleive
this gives me an extra 1/2 knot in windy weather????? Brian McCombe --- On Sat, 25/7/09, Graham & Judith Kirkpatrick <gka...@btinternet.com> wrote: |
Tony Voss
--- On Sat, 25/7/09, Graham & Judith Kirkpatrick <gka...@btinternet.com> wrote:
From: Graham & Judith Kirkpatrick <gka...@btinternet.com>
Tony Voss
I like Brian's idea of a dock line hauled up the mast to the hounds
(spreaders) and taken ashore abeam.
And if I have any concern about fore/aft stability, then I will take
the main halyard aft to the quay and perhaps the spinnaker halyard
forwards.
If I do end up drying out I will let you know how I fair. Hopefully
there will be no photo like Paul's to share!
regards, Tony
Boudewijn
Took my calipers, and my stays are 8 mm, and the shrouds 6.
So no reason to worry.
Had the rigging done (1975) by a pro outfit, they suggested two sizes,
of which I took the bigger. Must have been 8/6 and 6/4 mm.
Many French boats with similar sail area have even thinner rigging.
regards Boudewijn
Graham & Judith Kirkpatrick schreef: