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Re: Mast Step Postion [Re: Russ Atkinson] #14116
10/18/12 05:44 PM
10/18/12 05:44 PM
Joined: Oct 2010
Posts: 203
Oxford, MI
Conundrum Offline
Senior Member
Conundrum  Offline
Senior Member
Joined: Oct 2010
Posts: 203
Oxford, MI
True, the relationship between the headstay length and the mast step is vital, I wonder if on VEEJAY, the partners are correct. Can you achieve the proper J measurement 11' 6" +/_ 1/2" at the partners. That is the fulcrum point.


Don King
Re: Mast Step Postion [Re: Conundrum] #14129
10/23/12 08:29 PM
10/23/12 08:29 PM
Joined: May 2007
Posts: 1,234
Newport and Naples
Cap'n Vic Offline
Senior Member
Cap'n Vic  Offline
Senior Member
Joined: May 2007
Posts: 1,234
Newport and Naples
So OK ...
1. reset the step to 25mm [marina mechanic under my 'supervision' ... remember there are not a lot of people who have a hint as to what moving a mast step is in a power boat community ... nice thing about j30 people is we have to know what we are looking to do ... duh only took me 27 years to get to this one. ]

2. quick soda blast, prime and paint ... base looks new.

3. took the forestay out 3in. from where it was -- to a measured length of ~35'8, which pins to the stem 2 in. above the measurement point ... so I am probably a half inch under max 35' 10.5". [It is easier to measure center pin to center pin when off boat. Have 2 treads showing in turnbuckle so didn't get much room to go much beyond.]

4. mast max aft in partners ... measures to 11' 6"

5. tightened starting innners, then outers, then inners loos ~30 ...mast is way straighter than ever has been with a tiny bit of pre bend, minimal backstay tension -- not flopping loose.

6. Tension on roller furling appears to be adequate to avoid foil whip lash ... and tighter than before.

7. will test tomorrow, then regatta against known phrf competitors this weekend.

[Linked Image]

[Linked Image]

Attached Files
eIMG_0714.jpg [51.83 KBytes] - (1414 downloads)
Alignment prior to measurement of mast step J30.
eIMG_0718.jpg [41.47 KBytes] - (1892 downloads)
Max forward step position J30.
Re: Mast Step Postion [Re: Russ Atkinson] #14325
12/20/12 10:18 AM
12/20/12 10:18 AM
Joined: Jul 2010
Posts: 126
Atlantic Highlands, NJ
JeffSmithNJphoto Offline
Senior Member
JeffSmithNJphoto  Offline
Senior Member
Joined: Jul 2010
Posts: 126
Atlantic Highlands, NJ
How are the screws attached? Are there imbedded nuts or are they tapped into the fiberglass. I'm afraid an impact wrench will shear the screws. After a month of PB Blaster there is no sign of movement without the impact wrench.

Re: Mast Step Postion [Re: Russ Atkinson] #14326
12/20/12 10:25 AM
12/20/12 10:25 AM
Joined: May 2007
Posts: 2,668
Portsmouth, RI
Rhapsody #348 Offline
Past J/30 Class President
Rhapsody #348  Offline
Past J/30 Class President
Joined: May 2007
Posts: 2,668
Portsmouth, RI
They are screwed into the mast step directly. If frozen cut off, drill, then fill and drill again.

Re: Mast Step Postion [Re: Russ Atkinson] #14327
12/20/12 12:06 PM
12/20/12 12:06 PM
Joined: Sep 2000
Posts: 393
Rockwood, MI, USA
Russ Atkinson Offline OP
Senior Member
Russ Atkinson  Offline OP
Senior Member
Joined: Sep 2000
Posts: 393
Rockwood, MI, USA
There is lots of info in this thread.
Last winter I saturated the four mast step screws with WD-40 (screws all sitting in a pool of WD-40). In the spring I heated the screws with a propane torch and smacked them with an impact driver. Screws came loose
My biggest worry was that I would set the boat on fire when I ignited the screws saturated in WD-40 (I did not):)
I, of course cannot assure you that you won't break the screw heads off, but this technique worked for me

Re: Mast Step Postion [Re: Russ Atkinson] #14483
02/17/13 12:53 PM
02/17/13 12:53 PM
Joined: Oct 2007
Posts: 160
Vancouver, BC, Canada
dlabrosse Offline
Senior Member
dlabrosse  Offline
Senior Member
Joined: Oct 2007
Posts: 160
Vancouver, BC, Canada
When I had the mast step moved on my boat last summer, we ended up cutting the bolts off flush and re-drilling.


Dominique Labrosse
Red Five, #92
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