I asked Hans to post here and clear out the different profile issue.

I think that we need to strip those masts to find out for sure what they weight, I'll do that to my mast next weekend and hopefully Gato will find time to do so to their mast. I'll also use different micrometer to re-measure the wall thickness, at least what AHPC has in stock doesn't match to that. So more data coming in during weekend.

That is a good point ! Hadn't thought of that.

Wouter

Be sure to vile a small bevil (ramp) to the edge of the mast section. The vernier measurer (micro measurer) will maeasure the wallthickness some 10 mm away from the edge anyway. The saw cut itself (shards) can easily add a few tens of mm wallthickness and 0.15 mm difference is well inside that range. I had that problem just yesterday when keeping apart a tube with 2 mm wall and a tube with 2.5 mm wall for my landyacht mast. I didn't think the shards would pose a problem with (a large) 0.5 mm difference in wallthickness but I must admit that I was wrong.

Wouter

I’ll find the time, we are getting 24 new fresh hours each day after midnight. Don’t worry Wouter, we are using micrometers of good quality and we will not do it alone, too much work to strip and put back the things again.

The person who has the answer will not come forth and give it. A lesson already learnt is always ask for the specs when ordering, check that they are the right ones and verify what you get. As Wouter said, it’s very difficult to see the difference between the two profiles and a mistake can be done by accident or by somebody sitting on a pile of useless spars good for nothing and are tempted to pass one on from time to time...

I stripped down all fittings out of the mast and bare section weights 15.6 kg's, I believe that Gato's mast weights 15.5 kg's because we had 100 gram difference while fitted. I talked with AHPC and they said that typically mast section weights 15 kg's so basically we are quite close to that number well within manufacturing process variation, even though masts shipped to Finland seems to be on the heavy side.

If typical mast weights around 15 kg's then I don't think that I'll have too hard time righting (with aid) but I do see the difference quite large to carbon one (typically over 5 kg's), maybe with hand picking you could get better section but for shipping abroad that is obviously not an option. Also we got shipped one mast that is totally different profile (I was told that it was taken from wrong pile by accident), so obviously I'm not totally happy about all this. Happier than after weighting the damaged section though.

Hopefully one day we have enough real measurements available somewhere so that people can read that instead of hear say on open forum (let's face it even this post is such <img src="http://www.catsailor.com/forums/images/graemlins/wink.gif" alt="" />).

If there is interest, I can help out creating an online database on this and other measurements next winter. Measurers would submit the alread quality controlled data and we could keep measurement certificates online. Perhaps an idea?

NB: Next winter!

This mast was broken in a land accident.

It was a (I was told) light weight single handed AHPC section.

I never thought twice about it. I used it in all conditions, single handed and two up.

I never used a spinnaker with it, but did use a hooter a fait bit.

This section is 5.15 mts(515 cm) it weighs 8.5 kgs.
My vernias are not the best, but the wall thickness is more than 1.5 mm and less than 2 mm. Most likley 1.8 mm.


You do you sums.

My calcs suggest that would be around 14.2kgs for a 8.6m mast section.

Similar to wouters calc on the 150 x 63 section.

Are you the mast is the lighter Tiapan section.?

That's right in the range of what we have been getting. The history being spread around here, is that the 2 sections are the same with the exception of the added riblets to increase stiffness. From a cost point that makes the most sense as well.

I'm again somewhat confused, are you getting 14 kg's section with riblets or without?

With. I do not have a copy of the QC sheet from the last batch, but this right about what all of the ones we have recieved haved weighed. I beleive this is near the low end of the range, but the acceptable range was not very wide.

Ah well, then there is again bigger difference to what we have. I guess that yours are not hand picked either because you are ordering those in batches.