Just replaced my N5.7 DS rod with Murray’s.
Instructions say after pre-tension I should have 3/4” to 1” from top of nut to bottom of mast ball, and if more than that to cut it.
I have about 1.25” so it “should” be cut down, but doesn’t sound fun considering it’s solid a 9/16” SS rod.
Thoughts?
N5.7 DS rod length.
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Posted: Jun 14, 2021 - 12:04 AM
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Posted: Jun 14, 2021 - 07:59 AM
"If it works, don't fix it."
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Bill Townsend
G-Cat 5.0
Sarasota
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Posted: Jun 14, 2021 - 08:25 AM
If it is to long it could cause the mast base to break where the clevis pin goes through when lowering the mast. -
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Posted: Jun 14, 2021 - 10:06 AM
I would not hesitate to cut a 9/16" stainless rod. An abrasive wheel would make short work of it.
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Bryan in Poplar Grove, IL
Supercat 17, unknown year. Future project
Hobie 16, 1977 - died a spectacular death https://youtu.be/Y7O22bp2MVA
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Posted: Jun 14, 2021 - 11:22 AM
Exactly - simple machining (cutting and drilling) of stainless seems more daunting than it is. You don't need anything more than a cutoff wheel on an angle grinder for this.
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Southern Alberta and all over the damn place.
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1981 SuperCat 20 "Roberts' Rockets"
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Posted: Jun 14, 2021 - 11:40 AM
10-4. Thx guys.
Yea, was looking @the nice machine finished ends thinking “not gonna cut it like that with everyday garage tools “
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Posted: Jun 15, 2021 - 04:13 AM
WHOA WHOA STOP!
You’re talking 1/4” inch. That is a mouse fart in a hurricane. Go look at a dozen 5.0/5.2/5.7 and you will see a dozen different lengths.
There is absolutely nothing to be gained by cutting a 1/4” off the DS. You will not break the mast base...unless you fail to rotate, or drop it.
It does cut easy, but unless you want to spend some time with a file, or have access to a lathe, the end will be crap.
Years ago I made a new DS, for $16, documented here.
https://www.thebeachcats.…635f0d18b5ef69dff4b967cd
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Posted: Jun 15, 2021 - 09:12 AM
I can't talk much about the application as I don't have any cat experience other than what I've done on my H16. We have a lathe in our EAA chapter hangar and I use that often, but not for cutting down threads. Generally I'll cut it down and taper the couple of end threads on a bench grinder. If you put a nut on before you make the cut, removing it tends to clean the threads up so it is easy to thread on again. Generally I don't need to resort to pulling out the tap and die set to clean them up.
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Bryan in Poplar Grove, IL
Supercat 17, unknown year. Future project
Hobie 16, 1977 - died a spectacular death https://youtu.be/Y7O22bp2MVA
Hobie 16, 1978 - current boat
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Posted: Jun 15, 2021 - 10:34 AM
You really can't pre-tension (load up) the main beam and dolphin striker while the main-beam is still on the boat. It needs to be taken off and done if you want to do it correctly. Using a string from end to end on the main-beam you should have about a 1/4" bow at the dolphin striker. If you don't want to take the beam off, at the least, loosen every thing up.
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John Schwartz
Ventura, CA
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Posted: Jun 15, 2021 - 02:30 PM
Thanks for all the help!
Just had front beam off for trampoline replacement so loosening straps would be an issue
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