jimi
Well-Known Member
Woopee I'm on you're ignore list so I get the last word, what a bonus!
1) Hmmm ... not sure what I was supposed to arguing about ... apart from saying that ok the exam has been renamed but its the same thing with a different name. You seemed determined to make some sort of point in order to prove I was wrong about something or other.
2) You gave up trying to explain a boom preventer does'nt stop a boat from gybeing. I wondered if you were getting confused between a boom brake (i've actually got one in a box somewhere given to me by Claymore cos its a waste of space) and a gybe preventer BUT all your descriptions related to gybe preventers not boom brakes and you you did refer to boom brakes in your post. So we were definitely talking gybe preventers which you insisted did not exist and even if they did they would not prevent a gybe cos either the rope would stretch enough for the boom to whip round , or the rope would break or the forward cleat would rip out the deck.
It was pointed out to you in great technical detail why all these points were incorrect by numerous highly experienced people but nope LustyD knew better.
here's a relevant quote from the thread
Quote:
"Originally Posted by lustyd
It might or might not. In ideal circumstances it will hold long enough that the problem goes away, or even better will slow the boom as it goes accross the boat (there are braking devices on the market for this).
Sadly physics is not on your side here if you have a sailboat since it's pointy at the front, meaning that you cannot get a useful angle to stop the boom from moving completely no matter how tight you winch that handle. The forces required, thanks to this angle, are greater than most ropes could cope with so more than likely your rope will snap and the boom will be moving even faster. If you use rope strong enough to not snap, your deck fittings will probably rip out and then you have a boom followed by a projectile.
The reason I continue arguing on this is precicely because people such as Angele believe the rope will stop the boom moving - it won't. Far better to educate people on the real use of the piece of rope and where it helps and when it's likely to fail. When at sea having the best information is more important than the best kit."
I responded:
This really is such utter tosh!
Whilst I was doing my pull ups in the garage I saw my climbing ropes and it dawned on me what complete and utter rubbish you are talking!
eg a stretchy climbing rope like the Beal 10mm Tiger has a static elongation of 10% and a first fall elongation of 37% (ie from zero tension to big load), climbing ropes are designed to stretch to absorb force so the climber does'nt die. Static (or semi static) ropes like pre stretchetched polyester sheets are about 5% stretch see http://www.riggingandsails.com/pdf/marlow-info.pdf
Now on a 35 boat with a 10 ft boom out at 90 degrees , you will need c 10/(12+12+12) ie 28% stretch to get the boom past the mid point. That I suggest is ridiculous.
Now as far as ripping your cleats out and projecting catapultlike at the crew .. well quite frankly if that's what happens on your boat , you're well overdue a bit of maintenance!
The breaking strain of prestretched 10mm polyester is roughly 2 tons
http://www.jimmygreen.co.uk/p/techni...g-strain-guide
and if you've got 2 tons of weight at the boom end of a 30 odd foot boat then you're doing something wrong .. one of the reasons you've tensioned the thing in the first place is to avoid shock loadings!"
3)you said:"We could do with some peace and quiet from morons like yourself being so argumentative "
No I'm not going to shut up. If people post rubbish then it is right that is pointed out. After all this forum is for the exchange of information and often people who are learning are seeking information. It is only right and proper that incorrect information is corrected.
You might also like to refer to the T&C of the site which prohibits personal abuse. Calling someone a moron is definitely personal abuse (I know I used the word first but that was to describe the quality of the post, not the person so its not personal abuse).
You have spent 2 days arguing too, and you were in the wrong!
We tried that, but you were not prepared to listen and continued saying the wrong things.
I didn't make an arse of myself, I gave up trying to explain to you that a boom preventer doesn't stop a boat from gybing, which it doesn't.
Have you considered joining them? We could do with some peace and quiet from morons like yourself being so argumentative
1) Hmmm ... not sure what I was supposed to arguing about ... apart from saying that ok the exam has been renamed but its the same thing with a different name. You seemed determined to make some sort of point in order to prove I was wrong about something or other.
2) You gave up trying to explain a boom preventer does'nt stop a boat from gybeing. I wondered if you were getting confused between a boom brake (i've actually got one in a box somewhere given to me by Claymore cos its a waste of space) and a gybe preventer BUT all your descriptions related to gybe preventers not boom brakes and you you did refer to boom brakes in your post. So we were definitely talking gybe preventers which you insisted did not exist and even if they did they would not prevent a gybe cos either the rope would stretch enough for the boom to whip round , or the rope would break or the forward cleat would rip out the deck.
It was pointed out to you in great technical detail why all these points were incorrect by numerous highly experienced people but nope LustyD knew better.
here's a relevant quote from the thread
Quote:
"Originally Posted by lustyd
It might or might not. In ideal circumstances it will hold long enough that the problem goes away, or even better will slow the boom as it goes accross the boat (there are braking devices on the market for this).
Sadly physics is not on your side here if you have a sailboat since it's pointy at the front, meaning that you cannot get a useful angle to stop the boom from moving completely no matter how tight you winch that handle. The forces required, thanks to this angle, are greater than most ropes could cope with so more than likely your rope will snap and the boom will be moving even faster. If you use rope strong enough to not snap, your deck fittings will probably rip out and then you have a boom followed by a projectile.
The reason I continue arguing on this is precicely because people such as Angele believe the rope will stop the boom moving - it won't. Far better to educate people on the real use of the piece of rope and where it helps and when it's likely to fail. When at sea having the best information is more important than the best kit."
I responded:
This really is such utter tosh!
Whilst I was doing my pull ups in the garage I saw my climbing ropes and it dawned on me what complete and utter rubbish you are talking!
eg a stretchy climbing rope like the Beal 10mm Tiger has a static elongation of 10% and a first fall elongation of 37% (ie from zero tension to big load), climbing ropes are designed to stretch to absorb force so the climber does'nt die. Static (or semi static) ropes like pre stretchetched polyester sheets are about 5% stretch see http://www.riggingandsails.com/pdf/marlow-info.pdf
Now on a 35 boat with a 10 ft boom out at 90 degrees , you will need c 10/(12+12+12) ie 28% stretch to get the boom past the mid point. That I suggest is ridiculous.
Now as far as ripping your cleats out and projecting catapultlike at the crew .. well quite frankly if that's what happens on your boat , you're well overdue a bit of maintenance!
The breaking strain of prestretched 10mm polyester is roughly 2 tons
http://www.jimmygreen.co.uk/p/techni...g-strain-guide
and if you've got 2 tons of weight at the boom end of a 30 odd foot boat then you're doing something wrong .. one of the reasons you've tensioned the thing in the first place is to avoid shock loadings!"
3)you said:"We could do with some peace and quiet from morons like yourself being so argumentative "
No I'm not going to shut up. If people post rubbish then it is right that is pointed out. After all this forum is for the exchange of information and often people who are learning are seeking information. It is only right and proper that incorrect information is corrected.
You might also like to refer to the T&C of the site which prohibits personal abuse. Calling someone a moron is definitely personal abuse (I know I used the word first but that was to describe the quality of the post, not the person so its not personal abuse).
