Early 80 Nacras had 2 bolts thru the cross bar to hold to hulls, later models had straps over the bars;
So there are 2 vs 4 anchor points respectively. More is usually better. Is the 2 bolt system strong, or best to get a boat with the straps?
Do the through bolt anchors cause more cracks?
Thanks.
--
John
Nacra 5.0
CT
--
Early Nacra crossbar retention, 2 bolt vs straps, which is better?
-
- Rank: Mate
- Registered: Nov 25, 2015
- Last visit: Apr 07, 2024
- Posts: 657
Posted: Nov 29, 2018 - 09:11 AM
-
- Rank: Mate
- Registered: Jul 29, 2015
- Last visit: Mar 25, 2024
- Posts: 574
Posted: Nov 29, 2018 - 11:25 AM
The later boats had a 5-point connection in the front beam. In addition to the straps, a bolt inside the crossbar prevents rotation. I think the fact the straps were used in the later design was done for a good reason to distribute the load. I guess any boat that has survived 40 years deserves respect, but I would favor the newer design.
--
Tom
NACRA 5.7 (1984 Sail 181)
Pennsylvania
-- -
- Rank: Mate
- Registered: Nov 25, 2015
- Last visit: Apr 07, 2024
- Posts: 657
Posted: Nov 30, 2018 - 03:49 PM
Thanks Tom.
--
John
Nacra 5.0
CT
-- -
- Rank: Mate
- Registered: Apr 06, 2008
- Last visit: Aug 23, 2023
- Posts: 192
Posted: Dec 04, 2018 - 11:21 PM
I agree,inserted bolt besides 2 straps each side on my 5.2 before lost to hurricane Sandy I also kept the aluminum bar that ran from front cross bar to rear cross bar. sandy destroyed hulls but "frame"did Not suffer any damage, I duplicated same securing design for my N5.7 when we diassembled front cross bar to install new dolphin striker & bolt below mast- instructive photos available on this site were a Hugh help -
- Rank: Mate
- Registered: Apr 06, 2008
- Last visit: Aug 23, 2023
- Posts: 192
Posted: Dec 04, 2018 - 11:21 PM
I agree,inserted bolt besides 2 straps each side on my 5.2 before lost to hurricane Sandy I also kept the aluminum bar that ran from front cross bar to rear cross bar. sandy destroyed hulls but "frame"did Not suffer any damage, I duplicated same securing design for my N5.7 when we diassembled front cross bar to install new dolphin striker & bolt below mast- instructive photos available on this site were a Hugh help -
- Rank: Mate
- Registered: Apr 22, 2015
- Last visit: May 21, 2023
- Posts: 484
Posted: Dec 12, 2018 - 12:54 PM
My 1983 Nacra 5.0 has the 2 bolt setup:
When I got it, it only had one internal beam casting (no boss) at the end of each beam (total 4). I noticed that the hole in the beam was much larger that than the bolt, but didn't know why. Then I learned that there was a second type of internal beam casting with a boss to index the hulls to the proper width and prevent beam rotation:
To bolster the design a bit and correct my boat, I bought (4) additional castings with the boss. I run (1) casting with boss and one casting without boss at the end of each beam. 3-1/2 seasons on the boat so far and no issues. I do periodically check the bolts for proper torque and sometimes find that they are a tad loose. My strongest advice on these bolts is that you can not apply enough anti-seize compound before assembly. It's a SS nut on a SS bolt which a perfect recipe for seizing up and twisting off and you DO NOT want to go there
https://www.oreillyauto.c…cant/81343/4610251?pos=1
--
Hobie 16 (3 formerly)
MacGregor 25 (formerly)
Chrysler Dagger 14 (formerly)
NACRA 5.0 (currently)
High Point, NC
-- -
- Rank: Mate
- Registered: Nov 19, 2015
- Last visit: Jul 06, 2023
- Posts: 391
Posted: Dec 13, 2018 - 12:11 AM
I thought the early boats were the ones with the straps and the later ones had the bolts. My 18 square is an 82 and has the straps only. -
- Rank: Mate
- Registered: Apr 22, 2015
- Last visit: May 21, 2023
- Posts: 484
Posted: Dec 14, 2018 - 06:20 PM
Don't have an answer for you on what models and years used each type. A friend in our local club has a 1984 Nacra 5.0 and it has straps??? Go figure...
--
Hobie 16 (3 formerly)
MacGregor 25 (formerly)
Chrysler Dagger 14 (formerly)
NACRA 5.0 (currently)
High Point, NC
-- -
- Rank: Lubber
- Registered: Dec 26, 2018
- Last visit: Jun 25, 2019
- Posts: 5
Posted: Dec 26, 2018 - 05:57 PM
Hey all! Was going to make a new thread but this seemed like a good place to start!! I just picked up a 70s 18’ Alpha/Hobie cat for a friend. The front crossbar is not really secured and can slide side to side, well it slid too hard and punched through the hull... I can do Fiberglas work and fix it, but my question is how do I prevent this and how is it supposed to be secured?
Can I not attach pics directly to a post? -
- Rank: Chief
- Registered: Nov 26, 2009
- Last visit: Apr 10, 2024
- Posts: 2524
Posted: Dec 27, 2018 - 09:00 AM
Yes, you can, go to Site FAQ, on the menu, at the very top of the page.
--
Hobie 18 Magnum
Dart 15
Mystere 6.0XL Sold Was a handful solo
Nacra 5.7
Nacra 5.0
Bombardier Invitation (Now officially DEAD)
Various other Dock cluttering WaterCrap
-- -
- Rank: Lubber
- Registered: Dec 26, 2018
- Last visit: Jun 25, 2019
- Posts: 5
Posted: Dec 27, 2018 - 01:13 PM
Hey all! Was going to make a new thread but this seemed like a good place to start!! I just picked up a 70s 18’ Alpha/Hobie cat for a friend. The front crossbar is not really secured and can slide side to side, well it slid too hard and punched through the hull... I can do Fiberglas work and fix it, but my question is how do I prevent this and how is it supposed to be secured?
I put the zip ties on after to keep the pole from sliding down during transport.
Edited by sailwyoming on Dec 27, 2018 - 01:19 PM. -
- Rank: Lubber
- Registered: Dec 26, 2018
- Last visit: Jun 25, 2019
- Posts: 5
Posted: May 16, 2019 - 12:17 PM
Bump, any suggestions? -
- Rank: Mate
- Registered: Jan 14, 2004
- Last visit: Sep 06, 2023
- Posts: 858
Posted: May 16, 2019 - 12:26 PM
Greetings Sailwyoming,
Since this is an Alpha bow crossbar issue, not a Nacra beam issue, it would be helpful to start a new thread
--
Philip
-- -
- Rank: Chief
- Registered: Nov 26, 2009
- Last visit: Apr 10, 2024
- Posts: 2524
Posted: May 16, 2019 - 07:02 PM
I know how it is prevented on a Nacra, but no first hand knowledge of your Cat. Is there a Facebook group, or perhaps join the Hobie forum & ask.
This is the onlyy thing I’ve seen on them. Good luck.
http://https://www.thebeachcats.com/forums/viewtopic/topic/12350#pid27172
--
Hobie 18 Magnum
Dart 15
Mystere 6.0XL Sold Was a handful solo
Nacra 5.7
Nacra 5.0
Bombardier Invitation (Now officially DEAD)
Various other Dock cluttering WaterCrap
--
