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Re: [PBY] Breaking zone

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  • bob cleworth
    Bob The Cat looks good at Bull Creek, Lake Boga is up and Running and VH-PBZ is open at Shell Harbour, Broome and Darwin are worth a visit that s for sure and
    Message 1 of 10 , Dec 30, 2007
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      Bob
      The Cat looks good at Bull Creek, Lake Boga is up and Running and VH-PBZ is open at Shell Harbour, Broome and Darwin are worth a visit that's for sure and why not take in rathmines and Cairns. I am sure  Silvano would be pleased as I would to see you
      Bob 
      ----- Original Message -----
      Sent: Tuesday, December 25, 2007 3:03 AM
      Subject: Re: [PBY] Breaking zone

      Yes, one of my goals is to visit the west coast of Australia.  I would like to see the PBY when it is in its museum and completed (and Lake Boga?).  I also want to see you again and visit with Silvano.  Merry Christmas!
       
      Bob Bergstrom
       
      ----- Original Message -----
      Sent: Monday, December 24, 2007 2:14 AM
      Subject: Re: [PBY] Breaking zone

      Bob
      Yes it is summer and nice at the moment although we have had afew thunderstorms and quite a bit of rain - but we need every drop - the temp today about 26C - you shopuld come down here one day
      Bob
      ----- Original Message -----
      Sent: Sunday, December 23, 2007 9:30 AM
      Subject: Re: [PBY] Breaking zone

      Thanks Bob,  I hope you have a nice Christmas down there and no snow (just kidding, it must be summer for you now)..
       
      Bob  Bergstrom
       
      ----- Original Message -----
      Sent: Saturday, December 22, 2007 11:35 AM
      Subject: Re: [PBY] Breaking zone

      Australian War Memorial Bookshop - they are on line but you have to request the title
      The Avaiation Historical Centre Darwin
      Me
      Bob
       
      ----- Original Message -----
      Sent: Saturday, December 22, 2007 1:51 PM
      Subject: Re: [PBY] Breaking zone

      Bob, I want to get one of your books.  Where are they sold?
       
      Thanks
       
      Bob Bergstrom
       
      ----- Original Message -----
      Sent: Friday, December 21, 2007 6:14 PM
      Subject: Re: [PBY] Breaking zone

      Bob from down under,we never did worry about our hulls,all we needed was box's of pencils with sharp points,..Our bunch only flew the 5's.It would scare anyone of us, when we would have to use one of your A's for a strip landing..... We would bounce with a stall landing ,comming into Crawley the water was always calm,in G.Town it was a bit rough at times, but all in all,pencil carbon points did the trick.
       
       
       
      ----- Original Message -----
      Sent: Friday, December 21, 2007 6:38 PM
      Subject: Re: [PBY] Breaking zone

      On this point Bert Jones of Fishing Point, near Rathmines NSW and who was in charge of the Repair and maintenance in WW II said the PBYs hulls were prone to buckling so the RAAF fitted stiffening strakes to help alleviate the problem, he said he did not know about the PBY-5As as they did not have them at Rathmines on a permanent basis and most of the repairs and modifications were performed at Lake Boga
      Bob Cleworth    
      ----- Original Message -----
      Sent: Friday, December 21, 2007 10:31 AM
      Subject: Re: [PBY] Breaking zone

      I see no-one else has answered.  I don't have a technical answer but there have over the years been a number of hull breakages at that point, usually when the Catalina has suffered a very sudden deceleration caused either by hitting an object such as a sandbar or due to the nose-wheel doors blowing off through a heavy landing or fatigue failure etc. The most recent example of a breakage there is the accident to N322FA of Airborne Fire Attack which the crew survived.  I think that the weight of the engines etc above that point has a lot to do with it.  It does not always happen though but whether this is due to luck or pilot skill I wouldn't like to say.  Examples where the hull has not broken in such cases have been C-FOWE at Plymouth and VP-BPS at Southampton and, in both cases, the deceleration caused a water loop in which the aircraft spun to one side rather than staying in a straight line. Perhaps in those cases, the forces were such that the strain on that bulkhead was dissipated sideways and did not cause hull breakage.
       
      As I say, I am not an engineer so what I have said here my be nonsense! 
       
      David Legg
      Editor: The Catalina News
      The Catalina Society
      ----- Original Message -----
      Sent: Wednesday, December 19, 2007 7:19 PM
      Subject: [PBY] Breaking zone

      Hello,
      Just a question about a -maybe false idea of mine...
      Looking at some pictures of wrecks, it appears that many of them are broken afore Bulk.3.0 area, rather than astern Bulk.6.0. What is it due to?
      I think of the moment of inertia of the wing, when the plane is roughly stopped while engines run... Is it a zone of heavy stress if the nose wheel is roughly landed?
      Cheers. J-Christophe.


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