54 replies to this topic

[Ronny B]

  Last week I started building an OB20 (hull# 18).  So far, the jig set-up is going well.  Transfering full size patterns with a slightly sharpened piece of 1/4" dowel over a few sheets of carbon paper is pure magic and very fast.

  I am trying to get my head around the keel and stem.  Does anyone have experience laminating purple heart together?  That stuff is harder than most of the rocks around here I would have enough of it in the shop, but if there is a problem down the road,(or lake), with the keel, then the whole boat is garbage.  Maybe I should just get hold of some maple or fir?  The purple heart may also be difficult to shape at the bearding line and will probably cost more in blade sharpening than a few pieces of maple.

  Cheers,

Ron 

[hokeyhydro]

Douglas Fir? I think maple is for furniture, not boats. For serious boat frames I believe doug fir and southern yellow pine are good - time for the wood experts to chime in and correct or verify my guess. I use cypress myself, but then about 16' is my cutoff build point - small garage :-(

[Scott Dunsworth]

If you have that much purple heart sell it and finance your boat.

[Brent]

Can you trade purple heart for some white oak and Douglass fir?

Purple heart will be nice for trim pieces such as stem cap, rub rails, hand holds.

[Ronny B]

  I like that idea Brent.  I'll pick up a couple 2x12x20' pieces of fir tomorrow and keep the exotic hardwoods for trimming the boat out.  Fir appears to be what most of you are using for your builds.  I think it is best not to stray to far from proven materials at this point.  

[Ronny B]

OK folks,

Here are some progress pictures of my build here in Toronto.  I have not used any screws yet, but it is tempting.  To date, it has been an education in clamping.  This is my first boat build, (except a cedar strip canoe 20 years ago), and all has gone fairly well.  Some issues with twisting and bending at the stem, but this is a result of inferior wood and not a design problem.

  Steel strapping and wedges seem to work well for the bottom planking, but the true test will be for the side planking. 

Kind Regards to all,

Ron

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[russell]

Great pictures, I needed them! I just received my plans for the OB 24. Please continue with the pictures and comments, it will be a great help to me. It looks like you used spruce for the side stingers, I used the same on my Marissa after I found yellow pine just didn't want to do the "twist". The more pictures the better! Thanks, you build looks great.

[Gordy Hill]

I've always said "You can never have too much room or too many clamps"

I may have to re-think that.

 

 

Great pics!

Thanks

[Saxe Point]

I've never seen that much room and than many clamps for a build!

[Ronny B]

  I used up two 2x12x20' pieces of fir for the keel and side stringers.  The problem was that this lumber was all construction grade and it took far to much time to scarf all of the major knots out.  I would highly recommend finding clear lumber,(or at least what we call C and better), for any of the side stringers and gunwales.  The OB20 has some serious bends at the stem.  Soaking about 8' of the fir was the only way to bend it without breaking or cracking it.

  We have over one thousand clamps in the shop and rarely do we run out, but it has happened Gordy.

Regards,

  Ron

[Gordy Hill]

I'm just jealous Ron, really, really jealous.

 

Gordy

[hokeyhydro]

Yes, doug fir doesn't like to bend. I tried it years ago for stringers on an outboard hydroplane. 5/8" square and it was a bugger to force into the gentle bends needed. Also heavy so I never used it again.

[Ronny B]

  Chine flats have been installed on the OB20 and side planking is underway.  The steel banding and wedges are working just fine, but I'm not at the bow yet.  I felt that it was necessary to put some supports between the gunwales.  The strapping would have the potential to distort the boat if I wasn't careful.  I'm sure that one dozen nylon tie downs would do the same thing and possibly even better.

  Just trying to stay out of the screw/staple/nail discussion.

Regards,

Ron

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[LukaO]

Hi Ronny B

 

I am Luka from Croatia , can you please tell me how much playwood sheats is required for building a OB20 and glass cloth .Just for info to make my budget .

In croatia I can buy okume playwood dimension 122 x 255 cm  and ticknes of 4 , 9  mm  , dimension 4,0 x 8,36 ft  ticknes of  3/16" , 3/8".My question is  is the design based on this dimensions of playwood sheats.

 

This boat is realy nice looking and just what I need for fishing with my son. 

[Ronny B]

Hi Luka,

  To date I have used about 12 sheets meranti (1200x2400x9mm) for the bulkheads, stations ,stringers and bottom.  The transom and sides used up 11 sheets of 4mm okume.  The OB 20 hull needs about 32 square metres of 10 oz cloth and 25 litres of epoxy.

  The plans come with a material list that is accurate and generous.  

The hull was glassed this weekend and so far I'm pleased with the results.  I still have not used any screws,but things would probably be further along if I did. 

Regards,

Ron

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[Tarbaby]

I am liking this hull. I could see it as a center console..... Got me thinking.

[Hirilonde]

If I ever were to build myself a power boat, this would be it.  It is the quintessential lobster-yacht, and it can be trailered.  Looking good Ronny, I will be following this.  Where in Hrvatska are you Luka?

[LukaO]

Thank you Ronny B for fast replay.Tomorow I will make some call for price of material.Your boat looks great. 

 

 

Hi Hirilonde ,I am from Split ,second biggest city in Croatia . Capital of region of Dalmatia, in middle of Adriatic coast. Did you visit Croatia before.

[Hirilonde]

I got to spend 3 weeks cruising Croatia this past summer.  We made a couple stops on the Istra Penninsula and in Dubrovnik.  The rest of the trip was in the islands.  I did see a poster for a museum in Split while taking the bus from the ACI Marina to the old city in Dubrovnik

 

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[Regan Magor]

Ronny, where in Toronto did you buy your marine ply? Did you go with the obvious choice or Noah's or are there some other places in town with good stuff? Also, where in TO are you located? It would be cool to catch a glimpse of a real, live B&B motor-boat on the water after you launch.