OK, here we go Diana.
Diana says,
When your M26 heels, where is the other 1000 lbs of water?
Hunter 26 not MacGregor. I’m not sure what you are asking. A percentage of the 2000 lbs is below the surface and a percentage is above the surface and is being pushed down toward the surface by gravity at some angle of heel. The more heel the more water is above the surface. I cannot say the exact weight above the water at each angle of heel. Is it 1000 lbs, or more or less? I don’t know.
Boats don't heel round the point of the bottom of the keel. They are vessels; they are supposed to roll around a line between the end points of the waterline. Where does your M26 roll?
I never said my Hunter 26 or any boat heeled around the bottom of the keel. I said the keel on a keelboat only works in the water when it is forcing the hull down into the water as it is trying to be raised by the boat heeling. It is acting as a lever. Therefore it won’t keep the boat from falling over on the hard. Are you saying that the hull on a keelboat is completely buoyant when heeling and there is zero water displacement when it heels? Is it only the force of gravity acting on the keel alone that is attempting to lever the boat upright? Please explain. Maybe I’m missing something.
The centerboard in an otherwise unballasted boat is the only thing that CAN keep the boat from rolling over-- it is the only counterweight available. The mast on your M26 is about 28 feet high. What corresponds to the pressure of sail area in leverage to the boat's inclination to roll? The water in the tanks isn't low enough to be adequate counterbalance. All Macgregors rely on the lateral resistance of the centerboard as a counterweight. Many other unballasted boats do too.
There is NO centerboard counterweight. It weighs 100 lbs at most! You are stating that the 2000 lbs of water in the ballast tank are irrelevant but a 100 lb centerboard has a righting moment sufficient to keep a 6000 lb boat (4000 lbs of boat plus 2000 lbs of water) from rolling? I don’t know the design of the Mac centerboard, but I suspect it is about 100 lbs like the Hunter. Again, maybe I’m missing something. I will agree that as the boat heels the centerboard is being pushed against the water in an arc and the water will offer some token resistance to heeling simply by virtue of the fact that water is not quickly displaced as it moves around the centerboard. But move it will, and if the boat keeps heeling the centerboard will simply come out of the water at 90 degrees of heel. If the centerboard only weighs 100 lbs, how is it levering the boat back to upright? By what force? By this logic, if I am sailing a lightweight sunfish, I should be able to keep it from tipping over by simply putting my whole arm vertically in the water and my arm will keep it from heeling too much. Lateral resistance to “prevent” leeward slip, sure. Lateral resistance to “prevent” heel? This would seem to imply that as the centerboard moves upward in an arc it encounters more and more resistance because the water nearer the surface is somehow heavier or more resistant than 6 feet down? I’m not seeing it.
The water IS low enough. When I fill the ballast tank, the water rises in the 10” to 12” tower that the valve’s giant wing-nut and vent are located in under the bottom step. The water rises to within an inch of the top, therefore the top of the water ballast tank must be 9 to 11 inches below the waterline, as water seeks it’s own level.
The mast height on the Hunter 26 specs. at 40’ 4” above the water, the “P” is 30’ 1”.
What was the wind the other day on Traverse Bay? What reefs did you use? How far did you slip to leeward while maintaining course?
The wind was 12 knots steady with gusts to 16. No reefs, full main and full jib. I held the course as tight into the wind as I could get, to hit the mark I needed to get to Northport. Otherwise it would have been a hell of a tack. Our friends in their own Hunter 26 following us, went off the wind to reduce heel as they are not as sure of their boat. They hit the mark one and a half hours later. The main was sheeted in such that the boom was almost centered on the boat.
Hardly any slippage according the chart plotter. The outer limits of the rhumb-line were set at 330 feet and I never even came close. The gyro auto-pilot did most of the steering, because it is only a gyro, it cannot correct for slippage.
BTW:
1. Steel is a conductor; wood is an insulator. With energy costs, why would you conduct opposite temperatures into your house? Fiberglass: better. Wood: best. Foam in steel doors is on the inside; the skin itself is what transmits the temperature. Next sunny hot day, if the AC is not blowing on the inside of the door, go feel it and tell me if that's where you'd like to sit all day. (And how do you fix a dent in a steel door?)
All of my exterior doors are metal, 3 standard entry and 12 French doors. All of them have metal skins over wood. There is NO connection between the outside skin and the inside skin. I am, as I write this, sitting next to 7 South facing metal French doors without the air on and the inside metal is room temperature. I do have a small dent in one that I live with.
2. Ford Expedition: 7300 lbs, 351 cu.in., 18 MPH on a good day (if we're honest). Saturn: 2400 lbs; 35 MPH on a bad day. Gasoline: $4/gallon. Do the math. (I studied automotive design before changing to architecture.) The real reason the Ford Explorer and other SUVs exist is because they are based on trucks, which are/were exempt from Federal safety, emissions and fuel-economy restraints. It was a marketing trick. Fads being what they are, sheeple continue to buy them because other sheeple do. From point of fact, the SUV is a poor example of a comfortable, safe, economical or even useful car; and I defy anyone sensible to debate that. (BTW it can be argued that the SUV bankrupted GM.)
Yeah, That’s me. Sailboatin, gun-totin, Libertarian, Sheeple. My Pathfinder regularly gets only 15 mpg. 21 on the highway if I don’t push it and 11-12 while pulling 6000 lbs of boat and trailer. I doubt if the Expedition gets 15, let alone 18. I did a stretch in automotive and engine design myself. By the way, it ain’t a car and it isn’t meant to be. They are not exempt from safety or emissions restraints. If they were, I would have an engine with no emission controls on it. Have you looked in the engine compartment?
Safety? I was run off the road by a psychopath at 65 and when the front tires hit the mud on the side of the road and stuck, we went end over end a few times and then rolled for a while. I’m still walkin around. Shockingly, I have a problem with my back and the seats in the old and now new Pathfinder are FABULOUS. I just drove for 9 hours in it pulling the boat. You should try it. I drive my Mom’s Chevy for more than 10 minutes and I am in agony.
I’ll grant you, there isn’t much in the way of fuel-economy restraint; I can almost see the gas gauge going down when I’m pulling the boat up a hill. Unless I am missing something, NO cars have “fuel-economy restraint” the mileage target the car companies must meet are in the aggregate, not on individual vehicles.
As for economical, what’s the measure? If I had to rent a truck every time I wanted to pull the boat or the motorcycle in the trailer or the enclosed trailer to haul something, that wouldn’t be very economical. When parts become hard to get for that Saturn, how economical will it be?
I also use the Pathfinder for hunting and I like the fact that I have all my gear inside with me and 4 doors and the hatch to get to everything easily from the outside. If I had a pickup truck, I’d have to crawl into it to get to the gear in the back. I’m not doing that. And how would I get the deer into a Saturn? Put it in the passenger seat and belt it in? Maybe in California I could use the carpool lane.
3. I was designing sailboats professionally when I was 15 and studied under one of the undisputed greats of the field, an aerospace engineer with his own ties to Herreshoff, Brewer, Bergstrom and many others worthy of note. For the 40-odd years since I have been intimately involved in every aspect of the business and been responsible for the construction and design of some of the world's most beautiful and well-engineered sailboats. Meanwhile, your statements, though well-meant, show a plain deficiency in understanding of what makes a sailboat go, heel, stay buoyant and so forth. I would teach you; but it couldn't be done with a few board postings and I don't think you want the benefit of my knowledge at this point anyway. Please don't call me out on my credentials unless you don't mind me appearing to be arrogant in having to state them.
I’ll grant you, I haven’t designed a boat, but I did about that many years as an Engineer in new product development. I know my way around a slide rule and I have the log tables to prove it. You seem to have a deficiency in understanding why an SUV is the best vehicle for my needs, and then you call me a sheeple.
Let me see if I can briefly sum up my deficient understanding. First let’s agree to use the word “lift” instead of “lower pressure on the front of the sail, causing the higher pressure on the back to push the boat forward”. It’s a lot of words to type. The sails provide lift (some guy Bernoulli? Although, even his math is being debated in some circles), the jib providing it’s own lift and acting as a venturi for the main. The lift is horizontal, unlike the planes I fly which lift vertically. That’s why they don’t fall down all the time. We like to say, you can never have too much lift, altitude, velocity or fuel. They even got these flappy things that provide more lift.
The lift being horizontal, the boat heels because the keel prevents the boat from moving leeward very quickly. If it could move leeward quickly enough, there would be no heeling, it would just skitter across the water side-ways. I’ve launched a catamaran into the air a few times and aside from being a total rush, it moved leeward VERY quickly. Thank God I had those windsurfer foot-straps screwed to the wings or I would have broken my ribs AGAIN. Although a boat does move side-ways ever-so-slowly and slip leeward as you go.
Buoyancy is based on water displacement. The various shapes of hulls having differing buoyancy because of their shape. A pencil pushed vertically in the water? Not so much buoyancy. A real champagne glass has more because it displaces more water and a wine glass even more. Battleship Potemkin lots more. Vertical displacement of water? Meh. Horizontal displacement? Now you’re talkin! Eureka, the king’s crown is made of silver with gold plating.
So-forth? I’ve got no glib answer or that.
Sure, educate me, I can take it. I’m not a boat designer. Go research the Hunter 26. I can’t debate the Mac. Get the numbers on weight, balance, hull shape, water ballast weight and location, centerboard length and weight. Run the numbers and tell my how it stays upright with a 100 lb centerboard only. As Tom Cruise said, “show me the numbers”. I think he said that, anyway. Maybe I’m wrong, I’ve been wrong before. But maybe you are wrong and now you are in too deep to admit it.
Meanwhile, arrogant? Nah. I’ve seen arrogant! You’re just well meaning. In the South we just smile and say, “He’s well meaning, bless his heart”.
4. Don't get me started on computers! --I have called Microsoft Windows, beginning with '95', 'the greatest con ever perpetrated on the world population', and I stand by that with the intro of Windows 8.
Again, I got nothin. Computers are a mixed blessing. Can’t live with them, can’t kill them. You can shoot them, as that father proved on youtube. But you can’t kill them. But, you’ll have to pry my Windows 7 out of my cold, dead hand before I’ll go to Windows 8, I hear it’s awful for us old-timers. Still, it beats the hell out of DOS for easy to work with. The company I worked for bet on CP/M and “DOS” killed IT. So you can’t kill a computer, but you can kill software.