sailaboutvic
Well-known member
Orca
Last edited:
Orca attack
- Thread starter Sailfree
- Start date
shan
Well-known member
Correlation is not causation.
dunedin
Well-known member
All the usual suspects in here complain that nobody is doing anything about the Orca attacks.
Then the same suspects complain about the work being done by a body which has made the effort to capture and analyse real data.
They are doing more than the complainers are
PS. I suspect that the CA do know the characteristics of the boats who reported safe passages as well as the reported incidents. And that correlation is not proof of causation. But at least some observed and measured facts is a better start than web grumbling.
Then the same suspects complain about the work being done by a body which has made the effort to capture and analyse real data.
They are doing more than the complainers are
PS. I suspect that the CA do know the characteristics of the boats who reported safe passages as well as the reported incidents. And that correlation is not proof of causation. But at least some observed and measured facts is a better start than web grumbling.
Daydream believer
Well-known member
deleted
Last edited:
oldharry
Well-known member
Read the report. They are specifically not attributing attacks to the presence of black antifouling. However they ask why a significant number of attacks have occurred against boats that are painted black: "“If, on trouble-free voyages, you’ve only got 25 per cent of boats with black antifouling, why on the attack side, have you got more than 50 per cent with black?”
"...black antifoul is a ‘possible’ concern, and until more data is collected, it can only remain that" he concludes, simply highlighting a curious anomaly in the statistics which may or may not prove to be relevant.
Frank Holden
Well-known member
'Survive the Savage Sea' was mentioned in another thread yesterday. That boat and one other were sunk by orcas off the Galapagos in the 70's. They both had red antifouling. So that was 100%.
DJE
Well-known member
Trouble is it's a fairly small data set so random variations might be significant. If you go looking for any possible correlation you're likely to come up with something. If there were correlations between attacks and age of boat, number of crew, or some other variable we would probably ignore them.
Really need to see if it's repeated in next year's data.
Really need to see if it's repeated in next year's data.
shan
Well-known member
The sample size is far too small to draw any such conclusions.
Poignard
Well-known member
An argument in favour of yachts with full length keels?
oldharry
Well-known member
Isn't that the whole point?
FWB
N/A
DefinitelyAn argument in favour of yachts with full length keels?
. Mind you the rudder is still a lunch item.
Last edited:
Poignard
Well-known member
What a lovely boat.Definitely
Blueboatman
Well-known member
My thoughts too
FWB
N/A
Thanks, she’ll be 21 this year and hopefully see out my days
Blueboatman
Well-known member
Thanks, she’ll be 21 this year and hopefully see out my days
Boats like that look better and better with age I’ve always thought .
FWB
N/A
How I wish that also applied to her owner
Boats like that look better and better with age I’ve always thought .
steveallan
Member
Not when you put black antifouling over it
dunedin
Well-known member
They are analysing data in terms of keel / rudder type also. Early reports suggested that long keels with keel hung rudders did not fare any better.An argument in favour of yachts with full length keels?
Poignard
Well-known member
Oh dear!
In the good old days of Practical Boat Owner someone would have written an article describing how to make your own depth charges.
In the good old days of Practical Boat Owner someone would have written an article describing how to make your own depth charges.
Blueboatman
Well-known member
Or conduct a survey - 1,2 or 3 rudders best ?Oh dear!
In the good old days of Practical Boat Owner someone would have written an article describing how to make your own depth charges.
Or how to best trail a taserlog ??
Or indeed whether a smearing of whale oil grease on the rudder makes you a friend of the whales ..