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Matthew

Spindrift 11n mast parts

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Hello! I've been working on a Spindrift 11 for a year or so! 

 

It's going great, I'm about to glue the seats in. 

 

 and I'm about to source the parts for the aluminium mast, and, after having a few suppliers look at me like I'm a little crazy, I'm beginning to wonder if I've understood the plans right. 

They call for 3 tubes: 

6'L 2.5" D 0.065" Wall 6061-T6 tube

8'L 2.0" D 0.65" wall 6061-T6 tube

6'L 1.5" D 0.65" wall 6061-T6 tube

 

The wall thickness tho seems wayyyyyyy too thick? that 2" tube would have an internal diameter of 0.7", which would mean the 1.5" tube couldn't fit inside it... unless I'm way off. I also don't understand why the bottom tube would be thinner than the top ones. Has anyone else solved this step? 

 

I'll attach some build photos as well, because I love seeing other people's builds :) 

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On 9/26/2019 at 4:30 AM, Matthew said:

6'L 2.5" D 0.065" Wall 6061-T6 tube

8'L 2.0" D 0.65" wall 6061-T6 tube

6'L 1.5" D 0.65" wall 6061-T6 tube

1st number is the length, 2nd is the diameter and the third is the wall thickness that is the same in all 3.

Even though I am not a specialist in feet/inches, I recon for the first tube  a 6 feet tall,  with 2 and a half inches of diameter with a wall thickness 0.65 of an inch.

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Look at that first measurement:  there's an extra zero:  0.065.  That's what you're looking for, something under a 10th of an inch thick.  I was going to say that the same wall thickness applied to the 2d and 3d tubes, too, but i started looking up some suppliers, and their wall thicknesses were quite a bit less.  And 1.5 was "nominal," actual 1.9.  So, I got even more confused.

 

Advice at this point:  Call B&B.  They answer their phone.

 

I got a tube from the local supplier and they didn't bat an eyelash when I gave them the spec from B&B.  Whatever it was, it was standard stuff.

Fun fotos, by the way.

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Thanks Paul!
 

Yeah, I suspected a missing 0 on the metric plans, but wanted to be sure... I try to suspect an error on my part first before one on the part of the plans. I may give them a call or an email, but this helps a lot. 

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Oops! Yes that is definitely a typo. All the wall thickness for your mast sections are .065". I searched the plan files and found the error. The period ended up on the wrong side of the zero. I will correct it today. .065" is 16 gauge and is slightly thicker than 1/16" which is .0625".  

 

If you are building over in metric land, you might have trouble finding those sections. If your standard sections do not match the above corrected, find the nearest sizes and we will check that they meed the required specs. Make sure that it meets the 6061 T6 properties.

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I’m actually just having a beast of a time finding anything even close in New Zealand that isn’t 6060.
 

my sailmaker confirmed it’s not gonna be easy. I could import it from China but that not far off the cost of getting carbon fiber here. 
 

Is there any guidance on width and wall thickness of carbon fiber to get the bend / strength right? 

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Mathew,

 

This is a problem which I do not understand. Growing up down under I could get all of the 6061-T6 that I wanted. Surely they still have need of a higher strength aluminium since they went metric.

 

You do not mention the temper, T4- T6. The internet says that 6060 has similar yield strength to 6063 which is 2400 psi versus 40000 psi for 6061.

 

Let us know what sizes that you can get, around the sizes that we specify and we will see if we can find a work around for you.

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