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Old 10-10-2016, 19:36   #196
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Re: Drop Test Verification?

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So that 50ft drop has now become 15ft. That's a lot more believable.
and dropped onto a sandy beach? lets see. boat was hulled then beached so
are you likely to get slings under both hulls or just one sling under the bridge deck. Imagine they tried to break one hull off, so one hull resting on the sand, the other lifted 15 ' - no failure so hull dropped down onto the sand?
If the hotel owner really wants the boat gone from the beach he is not going to accept attempts to smash the boat to bits on the beach. IMHO
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Old 10-10-2016, 20:46   #197
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Re: Drop Test Verification?

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So that 50ft drop has now become 15ft. That's a lot more believable.

And is the cat in those pictures going to be 50,000lbs after it's been stripped of engines etc so that it can dropped to break it up? I doubt that.
Interesting how facts get added in? Who said it had been stripped of engines or anything else?

Yes one would think so, but perhaps there was no time allotted to that?
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Old 10-10-2016, 21:09   #198
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Re: Drop Test Verification?

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and dropped onto a sandy beach? lets see. boat was hulled then beached so
are you likely to get slings under both hulls or just one sling under the bridge deck. Imagine they tried to break one hull off, so one hull resting on the sand, the other lifted 15 ' - no failure so hull dropped down onto the sand?
If the hotel owner really wants the boat gone from the beach he is not going to accept attempts to smash the boat to bits on the beach. IMHO
Some more assumptions? "The vessel sat on a reef and chewed up the keels and then beached at some resort."
Sounds like the beach area was not just sandy, but rather 'rocky-reefy'?

Can't say the exact nature of the dropping procedure,...one hull or both.
at any rate it speaks well of the impact resistance.

BTW, have either of you gentleman ever read some observations by the famous designer Nigel Irens concerning complaint hull layups and reinforcements. I can't find them right now, but they are worth reading. He discovered them following the post examination of some failures on a few of those racing multi's.
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Old 10-10-2016, 21:32   #199
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Re: Drop Test Verification?

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BTW, have either of you gentleman ever read some observations by the famous designer Nigel Irens concerning complaint hull layups and reinforcements. I can't find them right now, but they are worth reading. He discovered them following the post examination of some failures on a few of those racing multi's.
Here is one example...
As the 60ft tris get ready for their TJV start, designer Nigel Irens talks to Elaine Bunting about last year's damage
Read more at "They'll never arrive 100% intact" - Yachting World


Quote:
“Last year there was a bulge in new boats being built and a wholesale move towards building in pre-preg carbon and Nomex core. Everybody had drifted towards this technology and although the stuff’s been around for a long time, what went wrong was the result of that. There may be a big learning curve now underway and it may be that some people won’t use these materials again. We certainly haven’t used them on Ellen’s boat [her new 75ft trimaran, currently building in Australia]. We’ve gone back to more traditional core material.

“Basically, what it’s all about is the materials have very adequate static strength and there’s no problem in terms of sheer pressure head. But in reality what’s appears to be happening is that there is not enough capacity to absorb the loads that the skin sees. These are much, much higher than was the case with a softer, more forgiving material.

What made it all the more catastrophic, says Irens, is that failure of this type of structure spreads very quickly. “It’s a very localised sort of wave impact or slap that causes the damage. But because the material is very rigid, the rate of propagation of damage is very fast.”
Read more at "They'll never arrive 100% intact" - Yachting World
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Old 12-10-2016, 06:43   #200
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Thumbs up Re: Are Cats Made from Duflex Panel Kits Strong ?

Mate, go on youtube and watch "sail, surf roam". Spirit 480 built in Tassie. Boat looks great and the guys are sailing her everywhere. Lots of Tech info as well. It is a entertaining watch regardless.
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Old 14-10-2016, 12:36   #201
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vessel Sea Surf ROAM

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Mate, go on youtube and watch "sail, surf roam". Spirit 480 built in Tassie. Boat looks great and the guys are sailing her everywhere. Lots of Tech info as well. It is a entertaining watch regardless.
I went to their website and found these 'build photos'.
the VESSEL — Sail Surf ROAM

Quite interesting, except I am not a fan of balsa core.
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