| Re: Power righting pole on NA 6.0
[Re: RickWhite]
#9746 08/23/02 11:11 AM 08/23/02 11:11 AM |
Joined: Jun 2001 Posts: 292 Long Island, NY Ed Norris
enthusiast
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enthusiast
Joined: Jun 2001
Posts: 292 Long Island, NY | (BTW, I continue to agree with you that the design as conceived is sound and effective, my only problem is with thet current implementation, which, as you say, is some other guy's work. You're very kind to try and sort all this out.) Sorry Rick, my post wasn't too clear on one point. Whether or not you put the plate next to the strut supporting the D-striker is irrelevent to the problem. You still have to locate the plate in such a way that it allows the pole to be used perpendicular to the tramp. That means it must be somewhere aft of the bottom of the beam, to get it out from under the D-Striker Bar. This of course tilts the plate and universal joint. A soon as you tilt the universal joint out of line with the pole while in use, you create the tipping moment I described in my earlier post. In Rick's implementation, the flanges are alligned to oppose this force, and the plate is curved to match the beam. See picture below: Rick's picture, showing the plate as he uses it.
(The plate now shipping doesn't work this way)The plate they're shipping now, unlike the one in your picture, is perfectly flat, except for the region in the middle where the nut'nbolt from the Uni-joint stick through. But the "flanges" on either side are in the same plane. Each flange has one rivet hole, centered in the flange. Absent bending this sturdy thing, you cannot mount it with the plate's long axis pointing up-and-down, like in your picture, above. As it is now shipping, it's impossible to install it this way. So when I called Murray's, the advice was to mount it the long way. (With the flanges pointing to the beam-ends) This place the single line of contact in line with the 2 rivet holes, and thus the force multiplier under rocking moment is near-infinite. Plus the rivets are not alligned to oppose rocking moment at all - - they have zero leverage to hold down the plate. Presto! Instant claw hammer/pry-bar. Hope this clears things up. Sorry they took your design and changed it. I repeat Murray's says they'll stand behind this and all their products, and that they're now looking into a fix. My guess: shims or exoxy-putty as a "fix up" for existing owners, and they'll curve the plates on future orders. There can't be more than 5 very popular beam curvatures out there, and for the odd one-or two, they can ship the closest aproximation, with Expoxy putty. Maybe they'll offer new curved plates to existing customers, but sliding in a shim and adding 4 rivets is an easier fix, and seems adequate.
Sail Fast,
Ed Norris
| | | Re: Power righting pole on NA 6.0
[Re: Ed Norris]
#9747 08/25/02 09:03 AM 08/25/02 09:03 AM | Anonymous OP
Unregistered
| Anonymous OP
Unregistered | Will the vertical post of the dolphin striker sustain the forces incurred in the righting procedure?
(Thinking of a new idea).
WindOverWater | | | The other perspective
[Re: nesdog]
#9750 08/26/02 01:08 PM 08/26/02 01:08 PM |
Joined: Jun 2001 Posts: 283 hobie541
enthusiast
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enthusiast
Joined: Jun 2001
Posts: 283 | I found that I wasn't enough of an acrobat to use Gary's solo right. Glad to hear it's working out great for others, though. Guess I just wouldn't call myself "Mr. Balance" or "Mr. Coordinated." If you put yourself in that category, you may want to think twice about the Soloright. The thought was also in the back of mind that if I fell off the wrong way, that I might just lose the old gonads!! Ouch! Fair winds, Tim J.
Tim D. Johnson
Hobie 20 #690
Bald Eagle Yacht Club, Fleet 52
www.beyc.org | | | Re: Another alternative
[Re: cappydec]
#9752 08/27/02 05:15 AM 08/27/02 05:15 AM |
Joined: Jun 2001 Posts: 12,310 South Carolina Jake
Carpal Tunnel
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Carpal Tunnel
Joined: Jun 2001
Posts: 12,310 South Carolina | I remember that the Hobie class rules specifically exclude the use of shroud extenders to be class legal. I've read the Nacra class rules but don't recall any mention of it. Does anyone have any comment on this?
Jake Kohl | | | Re: Another alternative
[Re: Jake]
#9753 08/27/02 05:29 PM 08/27/02 05:29 PM |
Joined: Dec 2001 Posts: 33 Canes
newbie
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newbie
Joined: Dec 2001
Posts: 33 | You may be right about the Hobie class rules, however, I believe the original intent was for righting a boat solo. If racing solo, you would either have to be over minimum weight of around 300 lbs or you wouldn't be racing under NAHCA. If racing under another organization, then I believe the Hobie class rules would not apply.
In response a previous writer, I have not found it difficult to "tightrope walk" Gary's system. If one were to use the one line righting system (single line thrown over the hull attached to the dolphin striker), it would be difficult, however, I use a homemade Hawaiian system. This in effect gives me three balance points, feet, left hand, right hand. This allows balance to be a non-issue. I do realize that others may find it difficult, I just wanted to clarify this.
Kip
Hobie 18 | | | Nacra 6.0 SoloRighting
[Re: Canes]
#9755 03/29/03 08:17 PM 03/29/03 08:17 PM |
Joined: Jul 2001 Posts: 851 US Western Continental Shelf hobiegary
old hand
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old hand
Joined: Jul 2001
Posts: 851 US Western Continental Shelf | The SoloRight instructions cleary indicate that you should use a righting line that leads from your hands, to both the front and rear of the boat. The Hawaaiin system can be lengthened to accomodate SoloRight use. It is not to be used with only a single righting line from the boat.
I have recently procured a Nacra 6.0 that I will SoloRight with the SoloRight capsize recovery system. Does anyone want pictures? Or will you take may word for it?
To date, the easiest boat to right with the SoloRight was the Prindle 19. The most difficult was the Msytere 6.0. Hobie 18, not bad.
The Hobie 21SE was a pretty good challenge, but that prototype tool was designed for use with assistance by a second sailor. (Even though the boat was indeed righted by one man without assistance!)
No matter what system you use, be sure to practice and to know your ability.
GARY
Santa Monica Bay Mystere 6.0 "Whisk" <--- R.I.P. | | | Don, glad to hear you're pushing...
[Re: cappydec]
#9757 03/31/03 09:36 AM 03/31/03 09:36 AM |
Joined: Jul 2001 Posts: 1,253 Columbia South Carolina, USA dave mosley
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Posts: 1,253 Columbia South Carolina, USA | the SC 20 to its limits and beyond. Now what can I do to get you here for the SC Nationals? Thom had said you were doing another race. Very sad to hear that as we are building momentum with ours. Let me know, maybe next year if you cant make it this year. David Mosley www.seacats.org
The men were amazed, and said, "What kind of a man is this, that even the winds and the sea obey Him?" Matthew 8:27
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