I've always understood it using hot, like almost boiling our boiling water, will freeze faster than cool water just because of evaporation making it cool more quickly.
I don't know, that was high school physics, and a quite a few empty bottles ago.
Does it really matter? Are we that bored?
I'm boatless.
-- Have You Seen This? --
Re: Couldn't right my cat solo. Need advice
[Re: Karl_Brogger]
#256816 01/31/1304:39 PM01/31/1304:39 PM
But...when you are cooler, you become more dense, thus weighing more, so you can right your cat, just as soon as you cool down enought to tip the CG past the CB, which is a BFD if you're not wearing your PFD, you could be DSQ'd.
Blade F16 #777
Re: Couldn't right my cat solo. Need advice
[Re: Andinista]
#256835 01/31/1309:16 PM01/31/1309:16 PM
But...when you are cooler, you become more dense, thus weighing more, so you can right your cat, just as soon as you cool down enought to tip the CG past the CB, which is a BFD if you're not wearing your PFD, you could be DSQ'd.
And if the water is warm you recover your normal density and that explains why sometimes the cat tips over to the other side..
Re: Couldn't right my cat solo. Need advice
[Re: Andinista]
#256839 02/01/1305:10 AM02/01/1305:10 AM
I've always understood it using hot, like almost boiling our boiling water, will freeze faster than cool water just because of evaporation making it cool more quickly.
I don't know, that was high school physics, and a quite a few empty bottles ago.
Does it really matter? Are we that bored?
try it.
and...yes.
Jake Kohl
Re: Couldn't right my cat solo. Need advice
[Re: Karl_Brogger]
#256843 02/01/1308:33 AM02/01/1308:33 AM
Couldn't tell ya, I'm just regurgitating what I was fed in high school. Neither would surprise me, water has many strange qualities unlike any other element.
I'm boatless.
Re: Couldn't right my cat solo. Need advice
[Re: Andinista]
#256869 02/01/1308:00 PM02/01/1308:00 PM
Not sure how many times it needs to be repeated, but apparently at least one more time... the angle of the line(s) has no bearing on whether or not the boat is righted. Over the hull, under the hull, using a righting pole, holding with your hands, holding with your harness, or holding with your teeth, it makes no difference. All that matters is the horizontal distance of your center of gravity from the fulcrum (which is the center of bouyancy of the lower hull). How you get your CG into position only effects the reactionary forces on your body (your comfort level), it does not effect the righting moment applied to the boat.
It is just like the teeter-totter we played on in elementary school- the rig is at one end, you're at the other end, and the hull is in the middle. Weight times horizontal distance.
sm [/quote]
If you had a proper diagram in front of you it would be obvious that your weight is 18 inches or more further out when you use over the hull and pull with your hands from above your head, which is a handy increase in leverege, in all of Scarecrows diagrams there is no righting moment at all because all of the people pictured are laying in the water.
Jeff Southall Current boats Nacra 5.8 1703 Animal Scanning Services Nacra 5.8 1667 Ram Raider Nacra 18 Square Arrow 1576
Re: Couldn't right my cat solo. Need advice
[Re: Andinista]
#256890 02/03/1307:47 AM02/03/1307:47 AM
If you are holding the rope with your hands there's no doubt it's better, beacause it requires less force to hold your weight. That's it. It doesn't mean it will provide more lever arm, it will just be easier for the same effect. The effect is only dependant on how far out is your weight. Now this discussion is poitnless anyway.. Bring the line wherever you want, it's not that you are compromising anything else. BUT. For setting up a righting pole it is worth to realise this mathematical and empirical fact (it doesn't matter whether the line is above or below the hulls in terms of lever arm). Why? Just because it's way easier to set the lines below the hulls. Making efforts to do otherwise is pointless.
Re: Couldn't right my cat solo. Need advice
[Re: Andinista]
#256898 02/03/1310:21 AM02/03/1310:21 AM