T.R | Title | User | Personal Name | Date | Lines |
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1091.1 | let's start with questions | LEDS::ROBERTSON | | Fri Jul 30 1993 08:56 | 12 |
| Ok, I'll start with some more questions.
1. How robust are outboard motors in rough water?
(this assumes a well maintained motor)
2. If, for instance, your motor dies, what are the proper techniques
for keeping your boat under control in rough water?
3. What is the ratio of anchor line to depth of water?
--Dale
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1091.2 | canned answers follow... | USCTR1::BORZUMATO | | Fri Jul 30 1993 09:31 | 13 |
|
i'll answer 2 & 3.
2. sea anchor
3. the recommended ratio: 7 or 10 to 1, i also will include 1ft.
of chain for each ft. of boat length. and for the finale...
A BRUCE ANCHOR WHAT ELSE.....
JIm
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1091.3 | | TOOK::SWIST | Jim Swist TAY2-2/C1 DTN 227-3615 | Fri Jul 30 1993 09:37 | 14 |
| Why would outboards be any less robust? Modern outboards are far more
reliable than sterndrives. That's why you see most medium size (20-28
ft) near-offshore fishing boats (Grady/Whaler/Mako/etc) with outboards
these days (twins if necessary).
The standard way to keep a powerless craft out of trouble in heavy seas
is to keep the bow into the wind/waves with a sea anchor.
Assuming good holding ground, you need a lot (5:1 or more) of scope to
anchor in rough weather. This usually precludes anchoring unless the
water is shallow (or you have a huge amount of anchor line). However,
it is my understanding that you don't really want to be in shallow
water in a blow - it will make the waves closer together and more
likely to break.
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1091.4 | i'll take door #1 | SOLVIT::AMATO | Joe Amato | Fri Jul 30 1993 09:36 | 8 |
| I'll try to take 1. I've buried my outboard (1987 yamaha 200) a few
times when backing up. Haven't had a problem, yet, but it is getting
old. You've gotta make sure that the engine stays dry, and that you
don't choke the engine by blocking the exhaust ports with water or get
water in internally through any exposed exhaust ports.
Outboards are more exposed, but because of that they're designed to
try and stay dry.
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1091.5 | no one anchor does it all ..... | MASTR::BERENS | Alan Berens | Fri Jul 30 1993 11:46 | 9 |
| re .2:
>>> A BRUCE ANCHOR WHAT ELSE.....
Well, depending on the bottom, a Danforth type, a CQR, or a Herreshoff
could be better. The general concensus (supported by practical
experience and anchor testing) is that there is no one best anchor for
all possible conditions. Each type has virtues and faults that must be
taken into account when choosing which to use.
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1091.6 | Reliability | SALEM::GILMAN | | Fri Jul 30 1993 12:48 | 52 |
| Ill take a crack at these interesting questions too:
1. I agree... keep the bow into the seas. Sea anchor is good way.
(How many of you CARRY a sea anchor on your small less than 20 foot
boat?) I don't, maybe I should.
2. Outboard failure: This is a question I have thought about alot.
There is NO way you can insure your not going to have an engine
failure. All you can do is plan for it. With a single engine boat
your at the 'mercy' of that engine. So, I have a 5 1/2 HP backup
outboard on the transom in case the main outboard fails. (which it
DID two weekends ago... blew a head gasket). The 5.5. got me home
slowly... but it got me there. Also I carry a two way radio, flares,
back up anchor (two anchors total) and you can always pray.
I have been in some pretty rough weather (which came up on me) with
my outboard, the case was getting DRENCHED but it kept running.
Getting pooped over the stern by following seas is my 'biggest'
concern. Lets face it, an outboard won't run underwater. Smile
Its news to me that sterndrives aren't as reliable as OB's. I had
assumed (apprently incorrectly) that it was the other way around.
Why are OB's more reliable? Is it because of the complexity of the
stern drives drive unit.... the gearing around corners and all?
I would think an essentially inboard engine (sten drive) would be
more reliable?
A friend of mine was out off the Isles of Shoals a few weeks ago and
BOTH outboards quit. He had to be towed in. (The moral, don't have
twin outboards share a COMMON fuel source.)
Anchors: It depends on the bottom conditions. I have read extensively
on this subject. There is no one anchor thats best for every
condition. Mushrooms are great for mud but would be a mooring anchor.
CQR's are great for rough (rocky bottoms) as well as ok in sand in mud.
Danforths are good in bottoms other than flat rock but would jam easily
in boulder type bottoms.
According to my reading... the Danforth is about as good an ALL AROUND
anchor your going to find. The CQR seems to lag the Danforth in
holding power POUND FOR POUND on a sand or mud bottom. But the CQR
would beat the Danforth on a scrabble or rocky bottom. If your
cruising you want a HEAVY anchor just to be able to PENETRATE through
kelp or a scrabble bottom. The BRUCE anchor (in the article) came
in behind the Danforth and CQR.
Scope: Five to one is a minimum, 7 to one is much better, and for
storm conditions at least 10 to one or MORE.
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1091.7 | | TOOK::SWIST | Jim Swist TAY2-2/C1 DTN 227-3615 | Fri Jul 30 1993 15:38 | 18 |
| Your basic inboard engine is just as reliable as an outboard. The
problem is that a stern drive is an engineering kludge which no amount
of fixes can work around. Too many clutch/shift problems for my
taste, not to mention the cooling system and outdrive "boot", both of
which manage to put rubber gaskets into stress-prone areas.
The other thing (and I don't know why this is true) is that there
appears to have been significant investment in outboard technology
relatively recently whereas the stern drive appears to be standing
still.
If I'm wrong, why do 80% of lake cruising carpeted Bayliners have
sterndrives while 80% of the Grady/Whaler/Robalo/Proline/Mako/et al
fishing boats are sold with outboards? Surely it isn't easier to fish
with an outboard in the way.
(Sure to start some flames but this file has been pretty dull since
Rick W left :-).
|
1091.8 | Outdrives | SALEM::GILMAN | | Fri Jul 30 1993 15:47 | 6 |
| Ok... the outdrive is mechanically alot more complex. I agree.
Complexity tends to = more opportunities for breakdowns. You
described my impression of outdrives, I just wanted to hear someone
else say it.
Jeff
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1091.9 | What was the topic again? | GLITTR::JOHNHC | | Fri Jul 30 1993 16:22 | 11 |
| Gee, it looks like you all haven't had any more than speculative
experience with rough water, so I'm approaching the obvious conclusion
that
You're all a bunch of motorheads with no experience.
<GRINS>
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1091.10 | Experience? | SALEM::GILMAN | | Fri Jul 30 1993 16:52 | 7 |
| Now what would make you say THAT John? Roughwater experience? Well
I guess the fact that we are still alive means that we havn't had TOO
much roughwater experience.
Smile
Jeff
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1091.11 | Oh, I don't know. Couldn't stop myself. <g> | GLITTR::JOHNHC | | Fri Jul 30 1993 17:14 | 1 |
|
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1091.12 | non-biased reply | APACHE::URBAN | | Mon Aug 02 1993 10:01 | 41 |
| <back to .7>
Ok Jim, I dont usually jump into these subjects cause opinions are
like... well you know. But like you said, it's alittle dull so
what the heck:
Yea, carpeted lake boats have sterndrives;
real boats have outboards! :>)
I kinda think that may be a matter of function in the smaller 'real
boats'. It may add some hinderance to fish around an outboard, but
not as much as having to hop over and around a motor box housing the
inboard power for an I/O right at the stern. This is much less an
issue on a lake boat as the motor box (padded with built in drink
holders of course) provides a needed function as a place to rest your
quiche and Evian while you fish the dog (or kids) out of the drink
with your boathook.
OF course, if the boat (either) is large enough to have height allowing
the motor to be under the deck then inboards are the 'only logical choice"
eh? I mean, who in thier right mind wants a mechanical kludge sticking
out the back of thier boat, or for that matter, wants to hang a butt
ugly smoke belching dont even SOUND like a REAL MOTOR outboard off the
back of a perfectly pretty boat if they dont absolutly have to cause
the manufacturer couldnt or wouldnt figure out how to build a real
motor into his boat????
Speaking of recent advances in BUSBdeSlaRMo technology I cant agree
with you more; And, it's about time. I think stern drive
technology is MATURE and RELIABLE while those other things really need
some attention bad. I know that when I am going down lake at night
I try to follow an outbaord if at all possible. Even though the smell
is bad and the buzz makes my ears hurt, the lack of bugs in the downwind
'fog' zone surrounding it makes it worth it.
I hope I've provided some objective insight into the sterndrive vs.
outboard comparison on this monday morning. God, I wish I was still
at the lake!
See ya, Tom Urban (lake boater, Larson, Sterndrive)
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1091.13 | I find it difficult to imagine | LEDS::ROBERTSON | | Mon Aug 02 1993 11:18 | 11 |
| Given the number of bearing, seals, internal and external
greasefittings, u-joints and the fact that all this runs at engine
speed until the output shaft where it is reduced, I find it hard to
imagine this is more reliable than a straight shaft and one 90 degree
turn turn to the prop. Where do you get off saying that outboards
need attention real bad? 4-cycles are out and the only discomfort
of two-cycle smoke will be gone.
Dale
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1091.14 | carry two anchors | SWAM2::WOYAK_JI | | Mon Aug 02 1993 15:13 | 35 |
| I believe .12 hit one point exactly..In the 20-30 foot range for a
fishing boat (walk around etc.) you do end up with much more usable
space with outboards verse I/O. In the larger boats (30+)you have enough
free board such that the engines in an I/O or V-Drive are actually
below the rear deck so space is less of an issue.
As for anchor's..We used to overnight at various points in L.I. Sound
and at Block I. and as everyone already noted the weather can change
easily..In a larger boat the answer is always use two anchors in rough
or high tide areas to insure you stay hooked..We had one Danforth and
one CQR which worked very well..I would suggest on any boat that you
have at least two types as you never know what type of bottom you are
going to end up trying to hook to..
As for weather no one mentioned fog..On the L.I. Sound it can move in
so fast such that it is beautifull and sunny where you are (say Block
I.) so you leave and end up hitting a fog bank on the way in the sound.
Nasty..If you play in the ocean I feel you should plan for the
unexpected and have the proper navigation gear..Even with the gear when
you finally have to rely on it 100% it is hard, because we are so
dependant on our visuals..
I do agree that you should always try to plan for the best weather but
even so it can change very fast..If you fish the canyons, you will at
one point or another experience rough seas. Some times Long Island
Sound was great and once you go out to open water, say going to
Newport, everything changed. You have to plan for the unexpected.
As for the comments about Sport Fishers/Convertables being poorly
designed I tend to disagree. The transoms may look low compared to the
main part of the boat but they are still 3+' high. On our 43 Bert,
there were steps up to the main salon which kept it very dry, and
the fishing area gets lots of water just backing down trying to land
a good fish..I have been caught in very rough seas and just cannot
imagine getting sunk due to water over the stern..Oh well
Jim
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1091.15 | sense of humor failing, keepin the day job | APACHE::URBAN | | Mon Aug 02 1993 16:17 | 19 |
| In .12 I was serious about:
<para 3> useable unobstructed space a strong consideration for
outboards vs inboards/sterndrives because of a protruding
motorbox in 'smaller' fishing boats.
<para 4> When a boat becomes large enough (or a motor box is not an
intrusion on function) then inboards become the most
desireable choice due to relative simplicity (IMHO)
<para5> Sterndrives are relaiable and mature technology. Not simple,
not the most mechanically efficient, but from my own
experiance, reliable.
The rest of the note was written with tongue firmly planted in cheek
( well mostly). I thought I had indicated that but...
Tom
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1091.16 | | MASTR::BERENS | Alan Berens | Mon Aug 02 1993 16:29 | 13 |
| re .14:
>>> I have been caught in very rough seas and just cannot
>>> imagine getting sunk due to water over the stern..Oh well
I too have been in very rough seas, and I can all too easily imagine
being sunk by a wave coming in over the stern. The worst experience I've
had at sea was spending nearly a day in a full gale in the Gulf of
Maine. We (obviously) survived, but the gale sank two sportfishermen,
one 38' and the other larger, one of them rather close to shore.
Alan
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1091.17 | It happens... | RIPPLE::CORBETTKE | | Tue Aug 03 1993 12:36 | 12 |
| re. last few
I fish a lot out in the waters off the Oregon Coast. When you go out,
the sea is, obviously, in your face. I usually go out during slack
tide to catch the bar at its best. Some times it can get rough out
there and you try to come back inside on a following sea. You lose
steerage as you come in, so power is a mandatory. I've come in with
18'-20' waves following and running at full power to keep them from
catching and breaking over the stern. We've lost a few from having
just that thing happen.
Ken
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1091.18 | | MASTR::BERENS | Alan Berens | Tue Aug 03 1993 12:55 | 9 |
| re big cockpits:
A simple calculation or two can be sobering. A cockpit 8' by 8' by 2'
deep will hold 128 cubic feet of water, which is about 958 gallons,
which weighs about 8200 pounds (sea water). It would take about 32
minutes to pump this back over the side with a 30 gallon per minute
manual bilge (a 30 gpm manual pump is big).
Alan
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1091.19 | Well put.. | STAR::BOIKO | ALPHA/VAX Performance Group - ZKO3/4 | Tue Aug 03 1993 13:17 | 6 |
| re .18
Well put Alan. That really drives home the point. Don't play with
mother nature, and think you will always win. You won't.
-mike-
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1091.20 | | TOOK::SWIST | Jim Swist TAY2-2/C1 DTN 227-3615 | Mon Aug 09 1993 12:15 | 15 |
| Aha, but 8200 lbs won't sink a hull with the foam flotation that most
fishboats under 30' have. Problem is that over 30' you can't
physically put enough flotation in, so you get none. I'm almost
coming to the conclusion that a 30+ ft sportfisherman may be in fact
less safe than a 25' Grady or the like.
On the O/B vs I/O arguments, yeah these are all opinions - I've tried
over the years to get actual facts but they are impossible to come by.
I'm pretty sure that the MTBF of a sterndrive is lower than an outboard
of the same year and approx power, but I can't prove it as a
statistical fact averaged across all manufacturers. In the case of
Merc Alpha drives on 5.7L and larger engines, and in the case of
certain model years of the OMC outdrive, I'm closer to certain than
pretty sure, but again, I don't have numbers.
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1091.21 | Offshore | SALEM::GILMAN | | Mon Aug 09 1993 13:06 | 23 |
| Whats an MTBF? Your description of a cockpit filling was interesting
and illustrated the point I was trying to make (in an earlier entry)
about bilge pumps being essentially useless when large volumes of water
are concerned. Your example didn't mention the futility of trying to
keep FURTHER boarding seas from REfilling the cockpit as you
frantically pump. Of course your bows should be into the seas anyway
but since you 'lost power' by getting pooped you better have a sea
anchor.
Those sportfishermen which were lost in the Gulf of Maine may well have
gotten pooped running for shore. Eyewitness Video TV show had an
episode of a Donzi Sportfisherman getting overwhelmed in a storm off
the West Coast. One large sea boarded the boat over the BOW and
knocked out the electronics and engines in one fell swoop. If it had
been over the stern they would have been in even WORSE shape (read sunk
even FASTER).
IMO boats intended for off shore use should have rounded cabin lines
with virtually no flat surfaces for waves to bash in easily. Decks
should be watertight. Transoms should be rounded, not the flat low
forms found in so many 'offshore' sportsfishermen.
Jeff
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