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Thread: Yet Another Putt Putt
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18th August 2019, 04:17 PM #16
Hmm, what to do with the keel.
The boat weighs about 600kg currently if my calculations are correct. The outer keel (correct / acceptable term?) is about 100kg of this. It's a big piece of timber. About 5.8m long and 150 x 150 in the centre. This tapers to about 150 x 50 at each end.
I suspect at some stage the original engine was replaced with the more powerfull Willys. At that time a bigger 14 prop was added and to give it room to spin the skeg was moved aft. You can see the original mounting holes. I believe that an extra supporting plate was welded to the skeg at this time to strengthen it to the keel.
I thought at first that the outer keel may have been an addition at the same time. Prior to the skeg moving, if the keel was in place, there may have only been enough clearance for a 12" prop which seems too small. And the timber detail at the bow looks a bit rough. Almost like the nicely rounded bow was 'squared' off, keel added and infill piece created.
But I'm really not sure.
My plan is to put the skeg back where it was and go back to a 12" or 13" prop.
And the point of this sleuthing is to wonder if I can remove this 100kg keel? Or at least cut it back significantly. I really don't want the draft this creates, or the weight. And it's too wide for the trailer rollers.
The inner keel (again, acceptable term?) is 70mm deep in total with about 40mm below the planking, It varies from 50mm wide fore and aft to about 140mm wide in the centre. So it's a fair size itself.
And all the hull seams will be routed, epoxy battened with a thin layer of glass over it all. So a lot of strength in all that.
But then the prop will be well below the keel. Is that acceptable? Or unwise? What sort of protective plate would be required?
Any thoughts or ideas??????????
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Thanks, Mark
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18th August 2019, 06:03 PM #17GOLD MEMBER
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Do you think they added the extra keel for stability for the cabin when it was added or for the bigger motor?
It is not ideal to have your prop too exposed if you intend on navigating a lot of shallow water. Perhaps you could add a bronze keel extension in front of the prop to give it some protection
i really like what what you are doing with her by the way. You still got the Willy’s motor in the shed?
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18th August 2019, 06:13 PM #18Senior Member
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Nice work (again) Kingfisher!
Good idea on the strengthening up as well-Gives you a fighting chance without the thing hogging too much.
Also glad to hear the 'flip' went as planned.
I just came back from Birdsville and stayed in Morgan on the way home-Wished I'd have known prior as would have been great to call on by-Beautiful location you have there! Scott.
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19th August 2019, 11:06 AM #19
I really don't know when the keel was built up but both of those options are viable. Or it may have always been like that. I reckon I'll move the skeg and slide in a 13" prop to see what the clearance is like. Maybe I cam just cut the keel down by half or so to maintain some protection.
The Willys has gone to a good home in Gawler. A bloke with about 12 of them apparently.
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19th August 2019, 11:08 AM #20
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22nd August 2019, 05:57 PM #21
The keel is off. Those bolts are hell to remove.
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The inner keel has an insert in the centre of it as per the photo its 2m long by 20mm wide. It just sits there filling the cutout. Why was it made this way?
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I slid a 13" prop into place and dummied up a keel and keel extension to see how they would fit. It looks like I can cut the 150mm keel down to 90mm and then trim and taper the remaining bit to lighten it still further and get it narrow enough to sit on the trailer rollers. Should save about half the weight - 100kg down to 50kg.
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25th February 2020, 05:16 PM #22
With the cut down keel sitting back in place it all looks a lot neater.
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I imagine the insert mentioned in the previous post used to be for a centre board. There's no other evidence of anything sailing related but what else could it have been?
Cheers, Mark
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26th February 2020, 09:31 AM #23
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25th August 2020, 12:42 PM #24Senior Member
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Hey Kingfisher-Have you any updates on the latest Putt Putt project down in beautiful Morgan?
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26th August 2020, 09:34 AM #25
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24th December 2021, 09:11 AM #26
It's probably time for an update - a bit has happened over the last 2 years.
I removed the extra lump of keel, about 80kg I reckon. I cut it down considerably, reshaped it and placed it back for a trial refitting. The skeg was cut back also and a smaller prop slid on to see how it all fits. It's interesting that the skeg now uses it's original bolt holes.
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I then got to work raking out the seams. It's best to remove as much putty and cotton as possible before routing as they just burn the router bit.
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There were quite a number of butts, so blocks were scarfed in to all of these. 1 plank was replaced also.
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The garboards were removed, lands cleaned up and then planks epoxied back into place.
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24th December 2021, 09:31 AM #27
The seams were then routed. There were several 'hollows' in the hull so props were placed under the hull to push them out. There was one 'bulge' also which was forced down with a lever. None of this left a perfectly shaped hull, but it improved significantly.
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Strips of Kauri were then epoxied into the seams. Bote Cote Epox-E-Glue is magnificent for this. No fillers, no drips, no runs - a real game changer. A quick sand shows a much neater hull. Props and levers were removed as the hull won't change shape now.
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Then, another rollover and removing all the ribs began. The roves were cut off with an angle grinder and the nails punched through.
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24th December 2021, 09:55 AM #28
The seams were then back filled with epoxy. I found it easiest to support the hull on an angle while doing this. A lot of filling and sanding was required, but finally it was fair enough to glass.
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Bearers were fashioned and epoxied in. Most of these were the original bearers reworked. And then ... she was turned over again.
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24th December 2021, 10:09 AM #29
Again, a lot of patching - particularly the 2000 (or was it 3000?) nail holes. A lot of fairing and then finally the glass.
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The keel was then epoxied back on. It required some innovative levers and straps to remove twist while the epoxy cured.
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The bow then received similar treatment and encouragement. A lot of filling was required to make this area fair. Again Epox-E-Glue is magnificent. Put it on as thick as you like and it just stays there.
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24th December 2021, 10:18 AM #30
While it's upside down, the under deck areas are easy to access. They were epoxy coated and have received one coat of undercoat so far. The outside of the hull is getting minor filling and sanding ready for undercoat also.
To date I have used approx. 20 litres of epoxy and 20kg of Epox-E-Glue. Painting will be Aqua Cote - another Bote Cote product. I've had limited success with applying it in the past but will persist as I love that it is incredibly hard.
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That's where I'm up to at Christmas 2021. Merry Christmas to all and happy boat building.
Cheers, Mark
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