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Maybe the beginning of a larger project #25: Set back

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Blog entry by Mark Shymanski posted 08-19-2013 05:11 AM 864 reads 0 times favorited 7 comments Add to Favorites Watch
« Part 24: Now I need a new tool Part 25 of Maybe the beginning of a larger project series Part 26: Something here is not quite right »

816 isn’t really ready for this step but I had to see what it would look like with the mast:-) I am actually glad I did this because I identified a significant flaw in my build. There is significant torque applied to the step and parter so with the way I’ve mounted the partner on the 3/8 bulkhead it is clearly too weak to sustain the kinds of forces that it needs to. I will need to re-work the bulkhead and step. I left the bulkhead free floating at base, in retrospect this was a bad idea. Having the bottom fixed would have added some rigidity to the bulkhead, but probably not enough. I almost popped the bulkhead right out as I tried to step the mast and it got a little sideways on me as I was lowering it. I also learned that the mast is too thick for the hole in the partner, which is good actually because I wanted to plane the mast down at the base to make it look a bit better. I think I am going to replicate the partner and use that as the step and perhaps add some bracing to the bulkhead to further stiffen things up.

Spent much of the day planing the mast into a cylinder, after my test fit I really do want to add more of a taper but may leave that until I actually get out on the water. During the storm we had here I puttered around a bit with different bits of line and trying to figure out the rigging. I think I have a good idea of where I want to go, I just have to get it done. I have a few ideas of how to attach the leech of the sale to the mast but some of them take considerable time so I need to get something working first I can get fancy later. I did pick up a power cord for my lathe so I replace the old cord and powered it up. It sounds smooth and powerful and of course very quiet. I dabbled at trying some turning, but I’ll talk about that on a different post.

-- "Checking for square? What madness is this! The cabinet is square because I will it to be so!" Jeremy Greiner LJ Topic#20953 2011 Feb 2



7 comments so far

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shipwright

5009 posts in 1464 days


#1 posted 08-19-2013 02:49 PM

Sorry to hear you had a setback Mark. The mast step itself should be glued to the bottom of the boat and should take a lot of strain off the bulkhead. If you make the step fit against the bhd and glue it to the bhd that should reinforce the bottom of the bhd without losing the scupper effect you got from not gluing it down. Then a simple stiffener across the top should do it.

As for the sail, I would discourage you from attaching the leach to the mast at all as that is the trailing edge. The luff however can be fastened very easily with a lacing. It works better with a gaff rig but should get you by even with a marconi sail. They are usually set up with slides in a track. Of course if it were me I’d make it a gaff or sprit sail.
What kind is it BTW?

-- Paul M ..............If God wanted us to have fiberglass boats he would have given us fiberglass trees. http://prmdesigns.com/

View Mark Shymanski's profile

Mark Shymanski

5113 posts in 2379 days


#2 posted 08-20-2013 02:03 AM

Thank you Paul for preventing me from making a horrible rigging mistake! I can just picture how ridiculous that would look with the leech firmly fastened to my mast as well as the luff! Newbies make such interesting mistakes LOL!

Shorty refers to the sail I am looking at as a ‘Leg o Mutton’ sail, an isosceles triangle with the long side being the luff and the clew at the opposite corner with the boom at right angles to the mast to be in line with the clew (that’s the outside corner right :-) ? I’m using this rig by default as I have no experience to make an intelligent selection from all the other types of rigs out there. As I am learning about this stuff it is becoming increasingly complex (which I am enjoying immensely). I will have to research what a gaff rig or a sprit sail are as those may be other good choices. What are the characteristics of these sail rigs that you prefer? Remember I barely know port from starboard (or luff from leech LOL!) so I need something simple, that and I want my kids to be able to handle 816.

It isn’t that bad of a set back. I sort of thought that the partner being by itself wouldn’t be enough and I will follow what you suggest and glue the step to the hull and the bulkhead to the step and I may just sacrifice a loittle more of the scupper and fillet and tape a good percentage of the bottom of the bulkhead. I don’t anticipate having huge amounts of water in there unless I dump 816. A 4 or 5 cm gap should be sufficient with a height of about 10 mm. I may brace from the bow to the bulkhead which would add significant rigidity to both the bulkhead and the locker lid so if I or the kids want to stand on it to cast or what have you.

I’m going to Winnipeg Friday/Saturday to celebrate my Mom’s and youngest sister’s birthdays so I plan to get the step mounted Sunday after church.

-- "Checking for square? What madness is this! The cabinet is square because I will it to be so!" Jeremy Greiner LJ Topic#20953 2011 Feb 2

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Napaman

5346 posts in 2744 days


#3 posted 08-20-2013 03:41 AM

I wish I had time to read this right now ( CAN you tell school started!!! I will go back and read)...I just wanted to share this quick observation——that mast looks soooooooo tall! I am using the leg o mutton too…so I cant wait to read the comments from you and paul…

the first month of teaching is not fun…work wise that is…its still fun working with the kids…

-- Matt--Proud LJ since 2007

View Mark Shymanski's profile

Mark Shymanski

5113 posts in 2379 days


#4 posted 08-20-2013 03:45 AM

I know what you mean, I used to spend the first two or three weeks horse from lecturing for 5 to7 hours a day. I feel your pain :-)

-- "Checking for square? What madness is this! The cabinet is square because I will it to be so!" Jeremy Greiner LJ Topic#20953 2011 Feb 2

View shipwright's profile

shipwright

5009 posts in 1464 days


#5 posted 08-20-2013 02:16 PM

Mark, choice of rig is a personal thing but I prefer gaff rigs for appearance mostly and the fact that they lower the centre of drive a little while maintaining sail area. The sprit sail is better suited to very small boats like this but both would require a little more complex rigging and would complicate things that at this moment, you don’t need complicated. The PDR site shows a couple with repurposed windsurfer sails. I think that would be ideal. On a boat I guess that would be called a lateen rig.

-- Paul M ..............If God wanted us to have fiberglass boats he would have given us fiberglass trees. http://prmdesigns.com/

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shipwright

5009 posts in 1464 days


#6 posted 08-20-2013 02:26 PM

OK I just looked up leg o mutton sails on the net. As applied to small boats they are a form of sprit sail. I think of them in larger boat situations where they are more loose footed conventional mainsails. That will work fine and be a little easier than a gaff or four sided sprit sail of the type to which I was referring. I still like the windsurfer idea though.

-- Paul M ..............If God wanted us to have fiberglass boats he would have given us fiberglass trees. http://prmdesigns.com/

View Mark Shymanski's profile

Mark Shymanski

5113 posts in 2379 days


#7 posted 08-21-2013 12:30 AM

I can see the advantage of lowering the centre of drive. It is good to know that it is acceptable for appearance to be a factor in rigging a craft, I thought it would be strictly a pragmatic type of selection process. I do want to experiment with different rigging but getting out there sailing is the first priority:-) I think I have a few seasons under my belt I’ll be better able to handle more complicated rigging, I suspect the kids (Lauren and Paul) will pick up sailing faster than I do. I have a picture in my mind of my family and I sailing a much more elegant craft than the PDR with proper rigging, sails, rudders etc.

I like the idea of a windsurfer mast and sail also. The buddy I’ve mentioned before (Phil) is actually using one on his resurrected sailboat hull. Phil has been experimenting with other sails also so I am hopeful to learn ‘hands on’ from him as much as I can.

-- "Checking for square? What madness is this! The cabinet is square because I will it to be so!" Jeremy Greiner LJ Topic#20953 2011 Feb 2

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