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The Repair of a Cedar Rib Canoe

Discussion in 'Traditional All-Wood Construction' started by Blott, Jul 28, 2019.

  1. Blott

    Blott Enthusiastic about Wooden Canoes

    I am the fortunate owner here in the UK of an early Peterborough Cedar Rib Canoe. She was featured a few years ago in Wooden Canoe and she is named Femme Fatale. I use her, paddle and sail here in the east and was sailing her just the other week.

    This weekend I was due out on Sunday paddling and as it had been exceptionally hot here for the last week I loaded her onto the car late on Friday so that she could get a good smoking in the forecasted rain over Saturday which would enable her to "take up".

    I have an Easiload side loading roof rack which makes loading a couple of wooden boats atop a Land Rover much easier. The instructions are quite clear

    [​IMG]IMGP0021 by Nick Dennis, on Flickr


    I thought I had secured the locking pins but on the first corner having left the house the rack slid off to the passenger side and the precious cargo went with it. The gunwales took the brunt of the force but being old and wormy they gave along with them one of the longitudinal stringers, a thwart mount and a few of the T&G ribs. Here is the damage:

    [​IMG]fullsizeoutput_3b3c by Nick Dennis, on Flickr

    [​IMG]fullsizeoutput_3b81 by Nick Dennis, on Flickr

    As you can imagine I was gutted.

    I stopped at a friends on the way home and he gave me a length of ash so that I could stabilise the wound when I got home which I did. Thes canoes are one of the most difficult canoes to build and the repair will be equally difficult. I grabbed every clamp that I had and set about trying to get everything nearly back where it should be. I used a ratchet strap to pull the end up and this closed the joint between the rib nicely but I could see that the tongue has been snapped. I also used some clamps and blocks to hold the ribs in and to reduce the bulging and to brace the split in the longitudinal stringer. Then bit by but I pulled her back into shape before screwing the temporary inhale into place.

    [​IMG]fullsizeoutput_3b51 by Nick Dennis, on Flickr

    [​IMG]fullsizeoutput_3b50 by Nick Dennis, on Flickr

    [​IMG]fullsizeoutput_3b49 by Nick Dennis, on Flickr

    [​IMG]fullsizeoutput_3b48 by Nick Dennis, on Flickr

    This is the most worrying damage

    [​IMG]fullsizeoutput_3b83 by Nick Dennis, on Flickr

    The repair I did last year was fine because it was new wood. The older wood was more worm-eaten in places than I though hence weakened.

    [​IMG]fullsizeoutput_3b85 by Nick Dennis, on Flickr

    So his is now with her all straightened up within 4 hours of the damage happening.

    [​IMG]fullsizeoutput_3b86 by Nick Dennis, on Flickr

    Here she is the other week in all her glory

    [​IMG]fullsizeoutput_33d8 by Nick Dennis, on Flickr

    [​IMG]fullsizeoutput_276d by Nick Dennis, on Flickr

    I will work out a plan of action but the list is:

    1.Cut and prise out a length of the broken stringer and let in a new length. Need to think about this.

    2.Get some maple and start shaping a new length of outwale. Will probably need 4- 5ft to give it strength. I can take out the section I let in last year and use the existing scarf as a starting point.

    3. Speak with Mark Adams about how to replace the broken T&G ribs as I believe he has done this.

    4. Call in quite a few favours

    5. Go cry into my beer.

    6. Do i an an inhale to give some additional strength. I have seen this on another cedar rib here in the UK ; not traditional and a bit clunky but added strength may help with longevity as despite the canoe being 120 years old I do like to use her.


    I will get her back on the water. I was researching how this canoes were built and will do a presentation at next year's Assembly on the subject with now some rather unexpected first had knowledge on how to repair . I was due to be displaying her and smiling her at a Canoe symposium in Holland at the beginning of September; that will now be out of the question so the Dutch will have to drool over my Chestnut.

    i will update this thread as i progress but do pitch in please.

    Cheers,

    Nick
     
  2. samb

    samb LOVES Wooden Canoes

    Nick,

    Having been thinking about this on and off all day, I think I'd replace both gunnels completely. It's a working / used boat and you already know the old ones are weaker. By the time you've cut in situ scarf joints you could have cut 2 new gunnels, and you'd not be worrying so much in future.
    With the stringer, its a bit more complicated. Grinding the bent over nails off in the damaged area then scarfing a new bit in would be time consuming. It might be worth a think about sistering a piece neatly along side (as I did on my board and batten) - and far stronger (and easier) than letting a piece in I'd have thought.
    With new gunnels in place, the 5 or 6 broken planks/ribs would get loads of support. Before trying to replace even part planks, I'd want to experiment. Even with the correct router bits it would be tricky as I think you'd want a scarf where it meets the old wood. Your boat already has one copper plate repair on it; It's an honest repair which you have no reason to replace. Would two honest repairs not be ok?

    If it were me, I'd spend the next couple of months mulling over the options and not do anything until you are sure.

    Sam
     
  3. OP
    OP
    Blott

    Blott Enthusiastic about Wooden Canoes

    Sam,
    I have the boat stable now and up out of the way. Mark is sending me the router bits so I can experiment with that and see. I will count how may broken planks/ribs there are and how far down the break extends.
    Agree on the gunwales. I will renew both complete . What wood did you use on the other boat you made having lofted the dimensions off my rib canoe?
    Agree that a sister/ slave across the broken stringer. May do a match on the other side so that stresses are kept even.

    Nothing will happen until autumn/winter.

    Thanks for the piece of ash, that did the trick and I got the shape back so she is in far better form than when I left you.

    Good luck with the house move.

    Nick
     
  4. mccloud

    mccloud Wooden Canoe Maniac

    Oh, NO! We feel your pain. Commiserations, Tom McCloud
     
  5. OP
    OP
    Blott

    Blott Enthusiastic about Wooden Canoes

    Over the last couple of days I have slowly tweaked and persuaded the wood and canoe back to its shape as I had some time and daylight to have a close look. The gunwales and shape are stabilised with the slave gunwale. Mark is sending me some router bits from the US nut I had a close look at the ribs and planks and believed that I could ease it all back so I opened the joints up, picked and cleaned out any loose bits and frass and then eased in some G-Flex. Using a set of deep throat clamps and some bits of timber in and out as spreaders I then tightened it all up placing some cling film between the planks and the clamps. This helps with the cure and I have found prevents the G-Flex going opaque. I then left it for 24 hours

    This is the area before

    [​IMG]fullsizeoutput_3b95 by Nick Dennis, on Flickr

    This is after and in the raw after a bit of sanding and picking

    [​IMG]fullsizeoutput_3b9b by Nick Dennis, on Flickr

    I then started to apply amber shellac until I was happy withe the shade match

    [​IMG]fullsizeoutput_3bb9 by Nick Dennis, on Flickr

    Here she is out in the daylight. I am more than happy with the match and results

    [​IMG]fullsizeoutput_3bc3 by Nick Dennis, on Flickr

    [​IMG]fullsizeoutput_3ba9 by Nick Dennis, on Flickr

    [​IMG]fullsizeoutput_3bc4 by Nick Dennis, on Flickr

    When the router bits arrive I will arrange and get some ribs cut just in case this "Nick repair" fails so that I have a supply of spares if needed.

    I have spoken with the owner of a local sawmill who I am meeting next week. He can cut me and plane to shape and profile a pair of gunwales in European oak but as the maximum length of timer available is 4.2 m I will have to create a scarf joint. Sam has said he can help me with the steaming and fitting so there may be a possibility that Cinderella will make the ball at the Dutch Canoe Festival at the start of September.

    Watch this space!

    Nick
     
  6. samb

    samb LOVES Wooden Canoes

    I can help with scarf joints too! - make sure you get enough length.

    Sam
     
  7. Michael Grace

    Michael Grace Lifetime Member

    I can't tell you how sick I felt for you when I read your post. I know how much you cherish this wonderful old canoe and while my feelings can't compare to yours, I'm so sad for you. But then I love how you carefully assessed the issues and got right to work on making things better (not at all surprising, though!). Keep pushing forward. And isn't this a great group? You can count on people across entire oceans to help bring your cherished canoe back to water-worthiness. Big ups to Mark!
     
  8. OP
    OP
    Blott

    Blott Enthusiastic about Wooden Canoes

    Yesterday I went to a local saw mill and had a chat with the owner. He can make me up the new gunwales in European Oak and has agreed to plane them down to the required profile. This means that we will (I say "we" as Sam has offered to help) just need to scarf the sections together, then cut the taper, steam, fit and hand finish. I just have to wait for the sawmill to call saying that they are done.

    In the meantime I thought I would make a start on getting the old gunwales off and the hull prepped.

    There were half a dozen screws on each tapered end which I managed to get out with the normal few words uttered under my breath as there was a 120 years worth of varnish covering them. Of course these screws have another function; they hold the decks in place. I have temporarily clamped all firm but will put some screws in to hold it all together until the new gunwales are fitted.

    Then it was slowly, slowly, gently gently working along the gunwale with a wide flat curved pry bar easing the gunwale off the fixing pin. I used a piece of wood to keep the pressure on and they slowly eased away and slid off the pins.

    [​IMG]P1030922 by Nick Dennis, on Flickr

    This is where the front deck came away. I will introduce some G-Flex when it gets screwed back to give some added strength. Remarkably, there were only two cracked rib tops all in an area where a repair had been done before my ownership. These too will have a wipe of G-Flex.

    [​IMG]P1030924 by Nick Dennis, on Flickr

    Eventually I had an instrument of torture with 160 pins sticking out (1 in every rib)

    [​IMG]P1030934 by Nick Dennis, on Flickr

    These that were in the deck length were snipped off flush with the face and I will punch them back. All the others were pushed through and pulled out.

    This area had quite a few more and a large copper nail suggesting an earlier repair

    [​IMG]P1030935 by Nick Dennis, on Flickr

    There was clearly the residue of some glue or old bedding compound.

    [​IMG]P1030942 by Nick Dennis, on Flickr

    Next job is to repeat the exercise on the other side , clean back the outside face of the old glue/gunk and get it ready for the new gunwales. I will also secure the decks with some screws which will be concealed beneath the gunwales. The decks are early 1 piece decks.

    Thats all for now. Progress is good.
     
    Benson Gray likes this.
  9. dtdcanoes

    dtdcanoes LOVES Wooden Canoes

    Blymie, myte...as has been said sort of, a canoer's lot is not an 'appy one. You are a bit of alright and a bit more ! I once came close to your event, but wonder if I could have girded up my loins as you have to get it done, WOW. Dave
     
  10. samb

    samb LOVES Wooden Canoes

    I think you've been listening to too many "English" people on tv.
     
    Dan Miller likes this.
  11. dtdcanoes

    dtdcanoes LOVES Wooden Canoes

    Oh, I cannot get enough.... and probably not enough of Gilbert and Sullivan.
     
  12. OP
    OP
    Blott

    Blott Enthusiastic about Wooden Canoes

    I removed all the pins. 160 ribs x 2 +320. In removing the gunwales there was the inevitable cracking of a few rib T&G joints but I think only about half a dozen which means I have got away lightly. The most difficult areas to remove were where I had repaired before with a section scarfed in and an earlier repair with a lot of nails and glue. To the cracked joints I eased them open slightly and introduced some G-Flex then let them take back their own position under tension. I then sanded down and cleaned off the gunk, to give a good base for the new gunwales to be affixed. A vacuum, a wipe down with a damp cloth, a bit of shellac over the sanded areas and then the temporary gunwales were screwed back on to hold everything in position.

    I am please at the continuous curve and shape which I have got back to the hull.

    [​IMG]fullsizeoutput_3d13 by Nick Dennis, on Flickr

    [​IMG]fullsizeoutput_3d14 by Nick Dennis, on Flickr

    This is on the inside where the worst damage to the ribs was. I reformed the crushed rib tips with the shards and G-Flex which will be strengthened even more when the gunwales are re-fitted.

    [​IMG]fullsizeoutput_3d11 by Nick Dennis, on Flickr

    and this is the overall profile

    [​IMG]fullsizeoutput_3d15 by Nick Dennis, on Flickr

    Just need the call from the sawmill now to tell me that the new gunwales are cut and shaped. :)
     

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