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#1
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posted to rec.boats.cruising,rec.boats.building
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I hadn't thought about it, but I grabbed one of my Tshirts to wear this
morning which had a Flying Pig on it. Good omen... Today I christened our Porta-Bote, Flying Piglet II (I is the ribby) and took him for a row. It was the second time he'd been together, and the first time he'd been wet. Before I did that, however, I modified him to take sculling oarlocks in what I hoped would be adequately reinforced measure for mounting. I'll tell the short story first, in a moment. The full story, including the gory details, follows that; if you're not interested in Porta-Botes, or the modifications to allow real oars, this full story will bore you silly. On the other hand, if you're considering a Porta-Bote, or have one and would like to improve the rowing experience, you'll enjoy the story. The pictures of all this can be found on my refit gallery http://www.justpickone.org/skip/gall...ze=640&start=0, under the sub-gallery Porta-Bote Maiden Voyage and Sculling Modification. The short story: I have put this together on the boatyard ground once before, just after I got it. In the intervening months, the opening stick has gone missing. No problem; I just stepped in, stepped wide as I opened up the sides, put in one seat, and moved on from there. Not a problem. I installed my sculling modification (detailed story below) uneventfully, and took it off to get wet. From the time I laid all the stuff (bote, duffel with all the seats, [supplied] oars, transom and hardware, and my sculls) on the ground to the time I was pulling it into the water was 6 minutes, including installing the rowlocks and sculling oars (what I started with, trying the supplied oars later). This is a 10' bote; bigger ones may take longer. I waded in the requisite 6 inches, entered stern first, backed him out a bit, turned it around, and gave it a pull. Oops. Unforseen (didn't think far enough) wrinkle - I'd fully prepared for torque. I forgot about flop. The oarlocks went half horizontal, as the bote (of course) flexes. More on my thoughts on that below in the details. It's been a couple of years since I rowed, what with all the surgery and working on the boat (the one we're going to cut the cords on and sail away in), so I had to remember a bit, but then settled down and in 5 strokes or so didn't quite plane it, but did, indeed, create a significant stern turbulence and, as one of the pictures shows, a nice bow wave. Ok. The concept works. What about the supplied oars? Oy. Understand, of course, that I come from a racing background, but even using all the tricks I could think of to improve the performance, by comparison, it scarcely moved. The only-1" stick in the socket would wear out the nylon bushing very quickly if that were what I used to row with. And, of course, with that lovely high freeboard, you either have to adjust the oars to only a foot or so inboard, or raise them very high to even catch water. Ehhh... There is no dink oar worth much, and these are notably bigger than most, so for most, they'll make the typical ribby or blowup look sick. SS nipple spring and nub would last a great deal longer in salt water, ditto the oarlock, but it's about par for the dinghy world. The oars themselves are a great deal better than the typical dink's. So, end of short story, I rowed it back in, and from the time I stepped on ground to it being in the van, it was about 10 minutes. Can't ask for much better than that. We have a 6HP engine for it when we need to cover some real ground; all reports have us planing instantly with both of us and all the stuff we care to haul aboard. Now for the gory details, for those more interested in minutiae of how this works/ed, and how the sculling adaptation went, and what I'd do differently if I were doing it again (and may, anyway, as it's so dead simple). Blow by blow: I had originally conceived that one might be able to use sculling oars - 296cm, or about 10', with efficient ends to catch the water - on a Porta-Bote (hereafter PB). Not even having one in sight, let alone owned, I had to imagine how I might do that. First, of course, I had to have a standard rowing oarlock - like you see in the Olympics. Fortunately, they're not hard to find, and I got a pair. The second is, of course, you have to have the proper oars. That's a little harder, but not impossible. I had a spare pair from rowing regular shells, but row2k, irow and other sites have used oars listed for sale. You can also buy them new, for about $4-600 a pair. Used is better, as they're not going to be in a competitive situation and even a beater pair from a rowing club, where I got my recreational double's spare pair, will work just fine for this application. You may be able to pick them up for $50, as I did. My solution for the expected torque was angle aluminum, obtained scrap from a trailer fabricator. Most welders will have some lying around. I got 1" Ell, 1/8 thick, 6" long. The initial pictures show me trying to make that work with a sufficient number of fasteners. In the end, after looking at how small that appeared, I chickened out and got 12" pieces - and this time 1 1/2", as that's all they had lying around. The first pair cost me 2, the second, 3 dollars... My rowlocks take 1/2" bolts, so I arranged it so that the attaching nut could not turn when squeezed tight by putting the hole such that the nut bore slightly on the curve of the inside of the bend, pushing the flat against the angle. I marked the center point of one of them, with the appropriate center for the nut marked. Then I clamped the two together, and drilled both of them at the same time. I did the same for the 6 mounting holes, on the other leg of the Ell. With the PB spread-assembled (seats in to give me someplace to sit), I dry-fitted the brackets. I used the seats' cup holders to hold my hardware :{)) Perfect! Same size as the existing oarlock receiver, so no change to the ability to fold it up. I pulled the insulation away a bit in order to drill my holes, and mounted the Ells with 8-32 1/2" bolts and nuts. The nuts pressed tightly enough to the PB soft poly that I didn't feel the need for lock washers, and the depth of the Ell and PB were such that no thread protrudes to catch something or somebody. So far, so good. The solution for mounting the rowlocks was to get an overlong bolt, use the appropriate spacers (which were relatively of no consequence as you'll see later) to allow for the proper left-over-right oar handle passage, and also (likewise of no moment in the end) to allow the oarlock to clear the rub rail on the gunwale. It turned out that the proper number of spacers for this length bolt (provided with the Concept II oarlocks, along with their appropriate inserts to allow adjustment of the angle at which the oarlock met the bolt) was 6; I put 2 on top in the port arrangement, and all 6 under in the starboard, allowing a higher left hand (if it mattered, as you'll see that it didn't). I also used a nylock nut under it, jammed up tight against the unthreaded shaft of the bolt, to provide the rest of the space below the oarlock. That would provide the bearing point on the top of the Ell and allow me to use a wrench on the top of the bolt to secure it. The nut under was just pushed in place with my finger, sitting on top of the flotation, and the bolt screwed down into it. Snubbed up with the bolt, it was fixed in place, but easily removable to fold back up. So, I did (removed it) and disassembled it, putting the (PB) oars, seats and transom and hardware into an inexpensive nylon duffel obtained in a buy-it-now retailer on eBay, put the PB, sculling oars and duffel into the van, and headed to a boat ramp. As seen above, *I* think this boat is a piece of cake to put together. My missing secret stick isn't of any event to me; if I had a 14 footer, it might, but I can't imagine it behaving any differently, other than having more seats. I opened it enough to stand on the sides (still folded in). stuck my foot under one of them, lifted the side and moved my foot over to the side seam. Ditto the other foot. Reached out and got a seat, installed it and repeated twice more. Kicked the center supports under the seats into the groove. Got out and put in the transom, installed the bolts, tightened the wing nuts. Installed the rowlocks. Shipped the PB oars. Installed the sculls (the long oars). Looked at my watch. 6 minutes. So, now I go for my first scull. The oarlocks do what they're supposed to do. The oars swivel in them, allowing me to feather. I notice that I dig a bit, surprisingly, as I've set the posts to be relatively vertical. Hm... The side of the bote is bending outward. Not making more beam - the top is bending over. Of course! There's this 5" tall or so stick on top of that Ell, and the least pressure makes the bote bend. My perceived solution to that characteristic is to add some leverage below. The ideal, not so easily found, of course, would be a plate with a top bent over, making an Ell with a very long leg. A foot down would still be well above the water line (you could always either use caulk or, like the transom, a rubber washer behind a SS washer, extending the 8-32 bolt to an inch or so, and with that arrangement, one could do with fewer top bolts, as there'd be less twist from the torque of your pulling on that post. I don't know how I might alter what I have without compromising the ability to fold it flat. Right now, the Ell is the same dimension, space wise, as the existing oarlock point, and there's no impact on folding it up at all. Without a plate as described, something added on would not have the same up-down rigidity, as it would be attached only to the current (my alteration) rowing bracket. However, I also think that as I remember how to row, that flexing might go away, as part of it, no doubt, is my pushing a bit outward, which isn't at all needed. That's because of the width of the hull where it's mounted. When I first spoke with Sandy (PB President), he indicated a 5' beam, which is perfect for a sculling oars' setup. However, these mount considerably astern of the beam, and so, in addition to my having to move the collars out all the way, they still overlap more than usual, and I'll have to relearn my stroke to not have my hands exactly centered on the middle of the pull. So, we'll see about that. However, I can say definitively that the PB is a great deal better rower with sculls, and it's possible to modify it without huge kludges or expense. If I consider the oars I have to be one of the $50 pair, counting the new oarlocks and all the hardware, I have less than $100 in this modification. I think I'll pay another visit to the welder and see about welding a leg onto these Ells. I believe that would resolve the wobble (still might cause the side to go out a bit until I remember/relearn how to row with more overlap on the crossing-at-center stroke), and add even more momentum to the effectiveness of the oars. So, in the end, a modification easy to do, and well worth the effort, if you like rowing. Another couple of thoughts occurred to me as I was thinking this through. The mount I installed is 6" aft of the standard. That works for me because I've got gorilla arms. It might not work for everyone. This is a 10 footer. A 12' may have the oarlocks further forward (which would be better, IMO). But, more fun to think about, I'd bet that you could row a 14 double. Two middle seats for the rowers, two sets of however it modifies best, and that boat would *move!* Heh. Thanks for listening. This project (as seen in my May 1 "Life on the hard" post) was my treat to myself for finishing a set of projects on our home (the boat in the refit pages); I've got to go back to plumbing and wiring and refrigeration gasketing, lighting and shelving, and engine and shaft alignment, so won't pursue this again for a while. In the meantime, I'll cogitate on how I can take care of the outward flop and if I come up with a simple solution, I'll post again about it. L8R Skip Morgan 461 #2 SV Flying Pig KI4MPC http://tinyurl.com/p7rb4 - NOTE:new URL! The vessel as Tehamana, as we bought her "Believe me, my young friend, there is *nothing*-absolutely nothing-half so much worth doing as simply messing, messing-about-in-boats; messing about in boats-or *with* boats. In or out of 'em, it doesn't matter. Nothing seems really to matter, that's the charm of it. Whether you get away, or whether you don't; whether you arrive at your destination or whether you reach somewhere else, or whether you never get anywhere at all, you're always busy, and you never do anything in particular; and when you've done it there's always something else to do, and you can do it if you like, but you'd much better not." |
#2
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posted to rec.boats.cruising,rec.boats.building
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My apologies for the current state of the website. I'm hopeful the
crash will be resolved soon; in the meantime, if you're interested in the rowing pictures or the rest of the modification pictures, please click the link I provided from time to time. When the crash is resolved, there are detailed pictures of every phase of my post. L8R Skip Morgan 461 #2 SV Flying Pig KI4MPC http://tinyurl.com/p7rb4 - NOTE:new URL! The vessel as Tehamana, as we bought her "Believe me, my young friend, there is *nothing*-absolutely nothing-half so much worth doing as simply messing, messing-about-in-boats; messing about in boats-or *with* boats. In or out of 'em, it doesn't matter. Nothing seems really to matter, that's the charm of it. Whether you get away, or whether you don't; whether you arrive at your destination or whether you reach somewhere else, or whether you never get anywhere at all, you're always busy, and you never do anything in particular; and when you've done it there's always something else to do, and you can do it if you like, but you'd much better not." |
#3
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posted to rec.boats.cruising,rec.boats.building
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Hey Skip:
Took a look see at your pics. Looks like you fond some of the clear helix coil pvc. Now tht you have some in your hands what do you think? Bob PS Dude........you've been busy! |
#4
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posted to rec.boats.cruising,rec.boats.building
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Pix are up, finally :{))
I like the Spiralite 115, what they had in stock. Virtually identical specs to the 090 recommended. See the late May gallery towards the end for the installation on the head. I got a whole roll of 3/4 and 25' of the 1.25. Looking at my pix, I see the flop of the oarlocks went away when I started to use them, so perhaps I won't bother with getting extensions made. As long as I'm not pushing out on the oar handles, the weight of the oar in the flat of the lock ought to keep it relatively oriented to the oar. So long as I can put strain on it, I can row it :{)) L8R Skip Morgan 461 #2 SV Flying Pig KI4MPC http://tinyurl.com/p7rb4 - NOTE:new URL! The vessel as Tehamana, as we bought her "Believe me, my young friend, there is *nothing*-absolutely nothing-half so much worth doing as simply messing, messing-about-in-boats; messing about in boats-or *with* boats. In or out of 'em, it doesn't matter. Nothing seems really to matter, that's the charm of it. Whether you get away, or whether you don't; whether you arrive at your destination or whether you reach somewhere else, or whether you never get anywhere at all, you're always busy, and you never do anything in particular; and when you've done it there's always something else to do, and you can do it if you like, but you'd much better not." |
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Porta-Bote Maiden Voyage and Sculling Modifications liv | Boat Building |