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Airolite_Boats · Geodesic Airolite Boats by Platt Monfort

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#1561 From: Brian Willan <bwillan@...>
Date: Sat Jan 12, 2013 3:24 am
Subject: Boat length Measurement question

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 ```Greetings I was watching the youtube videos on the construction of the nimrod. In the first video it shows a close up of the material cut list. I noticed something odd. The stringers are all 12' long pieces of stock, despite the canoe being listed as 12' long. So how is the overall length of a boat measured? Is it the straight line distance from bow to stern down the center? Or does it follow the curve of the boat? Obviously, if taking into account the beam width, a 12' stringer or gunwale length will be shorter on the end to end measurement due to the outward bend in the piece. So if some knows the answer to this question, I will be able to get a better idea of how much stock I will need to construct my 16' Arrow. Since 16' is the longest readily available length of construction material, I would want to avoid doing an excessive number of scarf joints to get the right length of materials that my boat will require. Thanks Brian ```

#1562 From: "gord_t3" <gord.caruk@...>
Date: Sat Jan 12, 2013 4:23 am
Subject: Re: Boat length Measurement question

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 ``` Hi Brian. An interesting observation. I went and checked my Nimrod plans and yes, the length of the canoe is actually 11'5". The BOM is correct using 12' pieces, and it results in a 11'5" boat, despite being named a 12. I never noticed this because I stretched mine to 13' to get more capacity, similar to what you are wanting to do. Yes, it is measured straight down the center of boat, stem to stern. Don't be afraid of scarfing. One of my boats is 18.5' and I had to scarf every lengthwise piece. Make a little jig to hold both pieces beside each other. Sand at a shallow angle with a belt sander (or saw, but you'll need this pretty smooth to glue it). You will always get a 180 degree joint. Gord ```

#1563 From: Marianne Guidos <mgdsmar@...>
Date: Sat Jan 12, 2013 9:20 pm
Subject: Re: Boat length Measurement question

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 mrkfortney@...On Fri, Jan 11, 2013 at 9:24 PM, Brian Willan wrote:   Greetings I was watching the youtube videos on the construction of the nimrod. In the first video it shows a close up of the material cut list. I noticed something odd. The stringers are all 12' long pieces of stock, despite the canoe being listed as 12' long. So how is the overall length of a boat measured? Is it the straight line distance from bow to stern down the center? Or does it follow the curve of the boat? Obviously, if taking into account the beam width, a 12' stringer or gunwale length will be shorter on the end to end measurement due to the outward bend in the piece. So if some knows the answer to this question, I will be able to get a better idea of how much stock I will need to construct my 16' Arrow. Since 16' is the longest readily available length of construction material, I would want to avoid doing an excessive number of scarf joints to get the right length of materials that my boat will require. Thanks Brian

#1565 From: "Roger L" <rogerlov@...>
Date: Sun Jan 13, 2013 3:55 pm
Subject: Re: Re: Boat length Measurement question

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 I used to be afraid of scarfing. What I did to fix that was to build a simple jig out of scrap wood so that I could clamp a stringer in the jig and run the circular saw against one side of the jig. Not knowing what was best, I made it for a 7:1 scarf. The result was a perfect scarf angle every time. No sanding required - just enough to break the glaze left by the saw - and the joint would always fit exactly. Then to test if it worked, I clamped and glued half a dozen scarfs up to make a single long stringer about 20 feet long.    ( Be sure to lock the scarfs prior to gluing with a couple of finish nails or the joint will slide)   Figured I'd use  the long stringer as a batten for drawing long smooth curves. Flexing it to draw curves would give a chance to see how it stood up to stress and whether the glue joints took the same bend as the were the same. To my surprise, it performed as though it was one piece of wood. It's still fine and been over 20 years now....and there are far better glues today. This one is stored across the rafters of my workshop.   Roger L. Don't be afraid of scarfing. One of my boats is 18.5' and I had to scarf every lengthwise piece. Make a little jig to hold both pieces beside each other. Sand at a shallow angle with a belt sander (or saw, but you'll need this pretty smooth to glue it). You will always get a 180 degree joint.

#1566 From: Brian Willan <bwillan@...>
Date: Sun Jan 13, 2013 4:09 pm
Subject: Re: Re: Boat length Measurement question

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 On 1/13/13 10:55 AM, Roger L wrote:   I used to be afraid of scarfing. What I did to fix that was to build a simple jig out of scrap wood so that I could clamp a stringer in the jig and run the circular saw against one side of the jig. Not knowing what was best, I made it for a 7:1 scarf. The result was a perfect scarf angle every time. No sanding required - just enough to break the glaze left by the saw - and the joint would always fit exactly. Then to test if it worked, I clamped and glued half a dozen scarfs up to make a single long stringer about 20 feet long.    ( Be sure to lock the scarfs prior to gluing with a couple of finish nails or the joint will slide)   Figured I'd use  the long stringer as a batten for drawing long smooth curves. Flexing it to draw curves would give a chance to see how it stood up to stress and whether the glue joints took the same bend as the were the same. To my surprise, it performed as though it was one piece of wood. It's still fine and been over 20 years now....and there are far better glues today. This one is stored across the rafters of my workshop.   Thanks for the tips there, Roger.  Do you happen to have a picture of your scarfing jig that you could post?  I've come to the conclusion that I will have to scarf all of the lengthwise pieces due to the length of the Arrow that I am going to build.  For the gunwales, inwales and rub rails, the pieces are about 3/8" thick x 1" wide, on which dimension did you do the scarf joint?  If using 8:1 ratio one way requires a joint that is 8" long and the other way only requires 3" for the joint length. Cheers Brian