Re: Thunderstorms
Posted: Mon Feb 23, 2015 12:07 pm
Just move to Southern California. The weather never gets that bad and your never more than 30 miles from a harbor.
Discussions relating to the MacGregor line of trailerable sailboats
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https://www.macgregorsailors.com/forum/viewtopic.php?t=23926
How true. With all the technology, they still get forecasts wrong.kadet wrote:True but even with all the modern tech they still get it wrong. The near gale I was caught in was not predicted when we set out for a weekend of sailing and fishing at an island about 20 miles off-shore. And when the weather was updated it arrived 12 hours earlier than predicted. We had slept over night with the intention of heading home at first light to avoid the gale coming the next evening. But when we woke it was already building and by the time we were ready to leave it was howling. 4+ hours motoring at 4 knots in 6-9 foot waves on the beam. Not fun but never felt unsafe just very uncomfortable.The most prudent thing is to be aware of weather and avoid it. With modern weather apps, this is easy to do.
I've been doing a lot of research into storm tactics because I'm about to start doing some passages on my 38'. I've been reading coast guard reports on various storm tactics, reading anecdotes of survival in storms, and reading the seminal book "Storm Tactics".BOAT wrote:Just move to Southern California. The weather never gets that bad and your never more than 30 miles from a harbor.
Nice analysis, Matt. It is clear you have given this considerable thought. I do not plan on making transits that would put me in that much of harms way, but it is good to be aware of worst case scenarios and our best strategy for dealing with them. Sometimes there is carry over in unexpected ways that pertains to novel situations that we can not anticipate. Thanks.I've been doing a lot of research into storm tactics
We are like Flordia Thunderstorms are regular summer events. We have weather radar, storm warning via phone txt messaging and VMR and Coast Guard VHF weather report and warnings, normally the minimum warning for a TS is 2 hours. At 14 knots that gives a 32 mile window of escape. In 7 years of sailing the Mac I have been caught once in a TS and it was sort of on purpose cause I wanted to test my storm tactics. As I have said previously from my expereince unless your motor fails motoring slowly into the prevailing wind is the best option in these waterbagos.I would like to hear what our members in Australia, Europe, and Asia think of some of their crossings.
Yes, if your going to traverse an ocean it's near impossible. The grief Mathew is getting from his friends that sail a MORGAN or a CATALINA is not really the same as what we get on the MAC. The boat mastreb sails is just as seaworthy as them all but it's a different experience because of that wide french design that has been used by so many solo world racers in the Vendee' Globe and other races. It takes the ocean crossing just fine but it's a modern design, not traditional, it takes folks a while to accept the new stuff - and any time you venture off the reservation your gonna get scoffers.. In that regard us guys with water ballast deserve a little bit of grief. Some sailors are not into modern hull shapes or ballast designs. Why are cruisers so nit-picky about this? Well, on any day of the week pull up a nice big satellite picture of the world and look at the weather out there in the middle of the ocean. I don't care where, Atlantic, Pacific, Indian Ocean, Bearing Sea, whatever. You will see that there is always (ALWAYS) "something" lurking about out there. That's the deal about the MAC: it DOES NOT cross the ocean. When you circumnavigate there is a dilemma you can't escape."never be out in a storm that is going to last for hours of even days on end "
I concur with all of these tactics, however I'm quite certain the deck hardware will stand up to a drogue. The forces present on the drogue are never higher than the weight of the boat because series drogues do not shock-load. They build up tension slowly as the wave reverses course in a sinusoidal curve. Ultimately there's no more force on the deck hardware than anchoring against a current that is the same speed as the wave motion. My recommendation to use a three-point harness is just to guarantee that you don't lose the drogue if you lose a knot.kadet wrote:We are like Flordia Thunderstorms are regular summer events. We have weather radar, storm warning via phone txt messaging and VMR and Coast Guard VHF weather report and warnings, normally the minimum warning for a TS is 2 hours. At 14 knots that gives a 32 mile window of escape. In 7 years of sailing the Mac I have been caught once in a TS and it was sort of on purpose cause I wanted to test my storm tactics. As I have said previously from my expereince unless your motor fails motoring slowly into the prevailing wind is the best option in these waterbagos.I would like to hear what our members in Australia, Europe, and Asia think of some of their crossings.
A Mac should never be out in a storm that is going to last for hours of even days on end that's going to require a sea anchor or drogue. Also the deck hardware would never survive being hooked to a drogue in storm conditions it's too flimsy and the deck too thin. I barley trust those cleats when I am anchored in a strongish wind![]()
The main reason to ride storms out at sea in hove to or under drogue is crew fatigue or boat damage, the boat is far safer while it is moving for the 20-40 min a thunderstorm lasts fatigue should not be and issue.
I agree the front of these boats are the best option to face the rough stuff, they wallow like pigs and want to broach if you try and run from waves.
BTW my definition of a safe harbour is not a harbour that lets breaking waves in, that maybe a harbour but it ain't safe
Looking at the maps of Avalon it is safe in a Westerly Northerly and a Southerly but in anything from the East it would be a nightmare. Proper all weather safe harbours have breakwalls all round and a narrow entrance.
Safest harbour for a Mac is in the car park of the boat ramp on it's trailer
Yep agree on that oneseries drogues do not shock-load
Attachments on the Hull
The hull attachments for the drogue should be as far outboard and as far aft as possible.
I have no information on the ultimate strength of a typical sheet winch installation, and it would be difficult to evaluate each structure. Unfortunately, a winch is not an ideal structure, since the load is applied above the deck line and tends to overturn the winch and pull it out. The optimum attachment for the drogue is clearly a strap similar to a chainplate, bolted to the hull at the corners of the transom and extending aft with a shackle.
For a load of 14,000 lbs, a strap ΒΌ x 2.25 x 18 inches attached with six 3/8 bolts would provide a conservative design.
A large steel cleat would be acceptable if the deck is thick solid fiberglass and a steel plate is provided underneath.
Engineered weakness is not really just in a MAC rudder system - the fact that someone made a system that bends before it breaks is not really a minus in my book:BOAT wrote:
On a well engineered boat there are things that are designed to fail believe it or not. Failure of a cleat is better than failure of a deck, and so forth. Sometimes I wonder if beefing up my rudders is such a great idea because I need to consider the hole in the back of my boat it could create. What's better, a lost rudder or a hole below the waterline?