Please allow to introduce myself....

[Ad Hoc]

"..Too light an outside glass layer.."

And the reasons for this statement is?...for the failure you experienced?

This just demonstrates
1) You're eyeballing wasn't working correctly, since you only now surmise this
2) How light is too light?

The most common reason for structural failure is a structure that is unable to withstand the loads. However, if you just wish to eyeball alone, rather than try to understand the mechanisms for the failure, that is your prerogative.....in which case, all i can add is..good luck!

no disrespect to the eyeballing!

[oscarvan]

The mechanism for the failure was impact. For example a boom hitting the deck, resulting in a crack. Subsequent water intrusion and the balsa core being compromised. This is not rocket science. Too light in this case is less than 1/32. Nothing I have ever sailed was that thin. The joint has failed in places form sailing stresses, combined with the lack of adhesion of the filled polyester that was used as the only bonding

The most common reason for structural failure is a structure that is unable to withstand the loads.

Hmmm. That's hard not to agree with.

[Nordic Cat]

Oscarvan, may I suggest you get in touch with the original designer, and speak to him?

The Danish built Dragonfly boats have a very good reputation, and there are a couple of forums for them out there as well.

You need to speak to Jens Quorning at Quorning Boats in Skærbæk, Denmark..

I'm sure he will be able to help you.

Alan

[oscarvan]

Hi Alan, thanks. I am on the DF users forum, it's a wee bit lethargic. I can try getting a hold of Jens, although I have heard he's not very interested in talking about the Canadian built boats. I think they were not too happy about the way that effort panned out.