eyelet on back of 97 natique |
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skier83
Newbie Joined: June-23-2006 Status: Offline Points: 6 |
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Posted: June-28-2006 at 10:37am |
Is this designed for pulling skiers, tubers etc.? When I have a lot of people in the boat and don't wnat to use the pylon.
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79nautique
Grand Poobah Joined: January-27-2004 Location: United States Status: Offline Points: 7872 |
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it's the lift ring put it's not an issue to tow skier's or tubes with it. A experinced skier is going to want to use the pylon but for beginers and modirate skiers it doesn't make a difference
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skier83
Newbie Joined: June-23-2006 Status: Offline Points: 6 |
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I thought it was designed as a lift ring just wanted to make sure it could handle skiers. yes, it would just be beginners(mostly my young nephews and freinds)
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David F
Platinum Member Joined: June-11-2004 Location: United States Status: Offline Points: 1770 |
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It would be a good idea for you to check the jamb nut and load distributing block on the underside of the deck just to make sure it is tight before you start pulling tubers/skiers. If the nut is loose, then I would imagine the lateral force could put abnormal stress on the thru deck hole that the lifting ring threaded rod passes through.
Otherwise, I agree with 79Nautique in that it is a non-issue to use the ring to pull tubers/skiers. |
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Tim D
Grand Poobah Joined: August-23-2004 Location: United States Status: Offline Points: 2635 |
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Which weighs more, your boat or a skier?
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Tim D
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David F
Platinum Member Joined: June-11-2004 Location: United States Status: Offline Points: 1770 |
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Tim:
That is not the point, it is a horizontal vs vertical load issue. The ring is designed for vertical loads. Some fear gelcoat cracking/damage when applying a horizontal load. But, if everything is tight, the deck is thick enough in the ring area to handle the horizontal load imparted by a tuber or skier. My '93SN has a tow spool on the rear deck (where the ring is on other years). The '93 thru '96 boats were the only years to have this spool. Now my thoughts are that this spool was added by CC because the lifting ring(s) were moved to the transon and below the swim platform. This move obviously rendered the lifting rings unusable for towing...hence the addition of the spool. The spool on my '93 is simply bolted through the deck with one 1/2" bolt with an aluminum load distributing plate on the underside of deck. Since CC thinks this is strong enough, then the lifting rings are certainly strong enough given they are basically handling the horizontal load in exactly the same manner. Just my $.02. |
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77stang
Senior Member Joined: May-19-2004 Location: United States Status: Offline Points: 342 |
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regarding lateral forces on the the lifting eyes. i bought my boat with a slightly bent bow eye rod (for lack of a better term - the rod that runs from the base of the eye to the bow floor area)the incident did put a inch gelcoat crack in the deck.
i gernerally only pull my kids on skis and wake boarding ranging from 55 to 125 pounds. so i've had little concern. however, whenever i get a bigger kid or am pulling a tub, i constantly worry. i'm eventually going to something similar to what david is talking about. it will ease my mind. |
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David F
Platinum Member Joined: June-11-2004 Location: United States Status: Offline Points: 1770 |
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Another thing I thought about: The lifting rings have two screws that keep the ring from turning on the thread rod and keep the ring oriented properly relative to the deck. Now, if the jamb nut is not tight to the backing block, then when you load the ring (or step on the deck around the ring, the ring will try to pull the two screws out of the deck and thus can crack the gelcoat radiating from the screw holes.
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Tim D
Grand Poobah Joined: August-23-2004 Location: United States Status: Offline Points: 2635 |
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David:
The point is, a person is not going to exert the amount of force equal to the weight of the boat. I know that the eye is for vertical lift, but my boat is 40 years old and never had a problem using the rear eye. Understand that we don't pull pyramids with the eye. |
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Tim D
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M3Fan
Grand Poobah Joined: October-22-2005 Location: United States Status: Offline Points: 3185 |
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I the 90-96 boats all had the spool- I know my 90 had one. What did arrive later was that grab handle on the back- maybe that arrived around 93. |
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David F
Platinum Member Joined: June-11-2004 Location: United States Status: Offline Points: 1770 |
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Tim:
I do understand. But, if you look how the lifting rings are installed, they are setup for vertical strength exclusively...NOT horizontal. You will also notice that I believe it is fine to use the ring for pulling skiers or tubers. So, we agree on your point. |
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Munday
Gold Member Joined: August-17-2004 Location: United States Status: Offline Points: 538 |
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Can you run the rope off pylon then thru lift ring to keep it centered?We used to do this in Dads old century when the boat was full.
good luck Munday |
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77stang
Senior Member Joined: May-19-2004 Location: United States Status: Offline Points: 342 |
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now thats a clever idea |
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79nautique
Grand Poobah Joined: January-27-2004 Location: United States Status: Offline Points: 7872 |
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that could create more force than just having it right on the lift ring it's self. It would create mechnical advantage as the skier went outside of the wake to the side. Look it as if you drew a straight line from the skier to the pylon, the rope would be at an obtuse angle as it passes through the lift ring relative to the pylon and skier. Simular to if you used a sinlge puley and where pulling and teathered above the pulley just laying it on it's side in a horizontal plane verse's a vertical plane the advantage is the same.
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Munday
Gold Member Joined: August-17-2004 Location: United States Status: Offline Points: 538 |
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Hmmm I see what your sayin 79,but I thought there was no mechanical advantage in a single pulley set up,but I've been wrong before.I'll have to think about it a bit more.
Btw I really think alot of your opinions and glad you share them freely here on CCF Good luck Munday |
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79nautique
Grand Poobah Joined: January-27-2004 Location: United States Status: Offline Points: 7872 |
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your right if the pulley is above the load, and both ends of the line are free to move or one end of the line is attached to the load. But if the pulley is attached to the load and one end of the line is tied off above the load and you are pulling from above then you get a 2X mechanical advantage.
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