Posts by Don Paul

  • What slows down a shaft the most?

    Quote from LunkerBuster

    Don, is it really possibly for there to be laminar flow along an object that is both creating forward disturbance and cavitating? isn't there going to be at least micro turbulence around the shaft?
    i see how laminar would be ideal, but i feel like that is only possible on paper, no?


    I have often wondered if the turbulence created by releasing the bands would disrupt the fluid dynamics effecting the shaft as well as the shafts own properties as it moved...


    Sorry I just saw the post.Yes perfect laminar flow is not very likely with our sliptips, shaft tabs, fins and heavy
    mono. long thin shafts are also susceptible to drag gyration. drag gyration is defined when the rear of the shaft
    rotates concentrically about it's axis in a circular motion off the flight trajectory line. The faster it go's, the harder it is to go fast. Shite I just realized I came to a Fun forum with cool bikini pictures and now I'm making this place sound like Work.:@^^ Here's some shaft porn.^^
    Cheers, Don

  • What slows down a shaft the most?

    Quote from greekdiver

    115cm asso tovarich (25 Bar) with 9/32 shaft is probably the fastest shooting shaft i have used. It would reach the end of the mono super fast. Everything else just seems slow after shooting that gun. My Denton shoots pretty fast but not as fast. A railgun feels like slow motion.


    Oh the call of the wild is beckoning, I'm feeling a pull back toward the Dark Side I may have to try using a air gun in the big surf this year. If lose it I can just buy another one.Where I'm going to dive for big White Sea Bass is down a very steep cliff trail. A 115 would sling over my back with my fins.^^ Ok... I'll start a new thread.
    Cheers, Don

  • What slows down a shaft the most?

    Quote from greekdiver

    115cm asso tovarich (25 Bar) with 9/32 shaft is probably the fastest shooting shaft i have used. It would reach the end of the mono super fast. Everything else just seems slow after shooting that gun. My Denton shoots pretty fast but not as fast. A railgun feels like slow motion.


    Oh the call of the wild is beckoning, I feeling a pull back toward the Dark Side I may have to try using a air gun in the big surf this year. If lose it I can just buy another one.Where I'm going to dive for big White Sea Bass is down a very steep cliff trail. A 115 would sling over my back with my fins.^^ Ok... I start a new thread.
    Cheers, Don

  • What slows down a shaft the most?

    Quote from aquaolga

    [quote='hau','http://spearfishing.world/forums/index.php?thread/&postID=22558#post22558']


    But, if to thicker spear to take more powerful bands, the spear will fly as quickly?


    Here are some approximate muzzel velocity's of shafts shot from my old Mares in fresh water, all at 20 Bar.
    (wet barrel)
    7mm shaft=34m/sec
    8mm shaft=29m/sec
    9mm shaft=26m/sec

    Cheers, Don Paul

  • competitions

    Those are very impressive images in your album. I like that stringer of ''Russian Barracuda'' we call that fish
    Northern Pike (esox lucius) I used to hand spear them on a lake in Connecticut when I was a boy.( very cold...
    no wetsuit)
    That is some hard core diving in that cold water, You are the real deal girl.:thumbup:
    All the best, Don Paul

  • What is Starboard?

    Dan that Leister Hot air gun is around $300.00 US add on top of that the skill to use it. If you have good TIG
    or gas welding skills you can take a shot. By the time you cut the starboard, fab and fit it you can have a shop
    do it for far less. '' Do what you do best...pay a guy to do the rest''.
    I'm all for learning new skills, but when you have to buy big buck tools it may not be cost effective.
    I would look around your area for a salvage marine supply yard. You can buy great boat stuff for penny's on the dollar.
    Cheers, Don

  • What is Starboard?

    Quote from Dan

    Can you guys give me the gist about this material, what application it's best suited for?


    I have a black starboard sheet which I'm thinking of using to construct a small box to hold my sounder/GPS because I can't find an appropriate mounting bracket. The sides of the box will be held together with screws but I also want to glue it. Which glue is best for this application?


    Does not glue well but you can melt it together with PVC cement. Even 5200 won't bond it forever.
    Don

  • Marine sealant alternative

    Quote from Mariner

    Cuz you gotta wipe your hands 5200 hundred times to get it off <img src= " class="smiley" srcset="https://spearfishing.world/forum/images/smilies/emojione/1f606@2x.png 2x" height="23" width="23" loading="eager" data-tooltip="biggrin" aria-label="biggrin">


    Turpentine works a lot better for clean up rather than acetone.
    Don

  • I got a boat

    This frame will also serve as a good place to grip when the boat is running in chop and someone wants to stand. It will have a few attachment points with the option of holding the guns all vertically or all horizontally.



    Dan, I would go with the vertical option, that way the floor bears the wt of the guns. The tips are pointing up out of the way. Crew will also have more room to move aft if need be. I would do it in SS.with poly
    bungies from west marine. I bet a lot of rail makers in Florida could use the work. You could also use SS rail
    tube and fittings. I like welded stuff for strength though.A teak top header can be fabricated for the top.
    Don

  • I got a boat

    Don, your retro pics remind me of "The most interesting man in the world." -Stay thirsty my friends.


    Thats too funny ! <img src= " class="smiley" srcset="https://spearfishing.world/forum/images/smilies/emojione/1f606@2x.png 2x" height="23" width="23" loading="eager" data-tooltip="biggrin" aria-label="biggrin"> <img src= " class="smiley" srcset="https://spearfishing.world/forum/images/smilies/emojione/1f606@2x.png 2x" height="23" width="23" loading="eager" data-tooltip="biggrin" aria-label="biggrin">:thumbup:
    Don

  • competitions

    There is the original and first Blue Water Meet held by the Long Beach Neptunes since 1964. The competition is a freedive, one game (over 25#) fish meet held in June. It is not open to the general public unless sponsored by a Long Beach Neptune. We have had competitors from all over the world.
    Cheers, Don Paul