HERE WE GO AGAIN !

Discussion in 'Bush / Float flying' started by tunnels, Sep 25, 2015.

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  1. Sep 28, 2015 #41

    tunnels

    tunnels

    tunnels

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    In this type of hull 25 to 30 mph it would be wanting to be on top of the water planning as speed increases then the tunnel is compressing the air and the faster its goes the higher its will climb out and on top and at 70mph its would be literally flying !! the optimum angle of attach would be built as to the same as the planes some where in 3 to 5 degrees so everything all works together at the same time !
    With this type of hull form all of the hulls bottom surfaces contribute to lifting water doesn't climb any where even inside the tunnel !! the pressure of the air is slowing gaining pressure and being compressed till it finally reaches the transom ! Yes all this has been describes more than once and still no one has spent enough time looking !

    Its not a catamaran !! because cats by nature have narrow hulls they provide little in the way of lift ! because the tunnel between there hulls is much bigger and higher it also contributes almost nothing to lifting the cat so they plough through the water and ride much deeper .
    Think how many racing cats are seen out on the water?? non at all ,because they are not the same as a tunnel , they are slower and DO NOT PERFORM WELL!!!
     
  2. Sep 28, 2015 #42

    bmcj

    bmcj

    bmcj

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    Perhaps the way to make a tunnel truly effective is to have a drooped trailing edge (to act as an apron) and to blow air underneath. I have seen a few designs that make use of this idea, including hovercrafts and one of the giant Russian Ekranoplanes which had a small beam of jet engines on the nose that could rotate to direct the blast beneath the primary wing.
     
  3. Sep 29, 2015 #43
    So now you are claiming that it actually *is* an Ekranoplan. Well there are better ways to do that too.
    images.duckduckgo.com.jpeg
    Role Ekranoplan
    Manufacturer Central Hydrofoil Design Bureau
    Designer Rostislav Evgenievich Alexeev
    First flight October 16, 1966
    Status sunk in 1980
    Number built 1
    540 tonnes, 400km/h.
     
  4. Sep 29, 2015 #44

    tunnels

    tunnels

    tunnels

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    man alive are you confused !!
     
  5. Sep 29, 2015 #45

    tunnels

    tunnels

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    The cut always on each side are a bad choice as that part of the two hull halves is totally necessary!
    you completely missed the point of how a tunnel works and putting a foil in between the two hull halves makes it even more efficient!
     
  6. Sep 29, 2015 #46

    BJC

    BJC

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    Mr. tunnels:

    If you are correct, and all existing, proven float designs are poor performers, and you know how to "get out of the box" and design and build much better floats, then why aren't you?

    It could make you wealthy.


    BJC
     
  7. Sep 29, 2015 #47

    Starjumper7

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    The thing about that foil wing between the hulls is that those were created for big old things like tugboats and speedboats with no power and no speed !! That kind of foil has to stay underwater because if it comes to the surface the drag is huge !! Like I said before !! That in combination with the suckyrocker bottom will prevent takeoff !! You need surface piercing foils, which are shaped like the bow of a boat, and look like a shortened pontoon back to the step !! Like I said before !! ... unless you are planning on having 800 hp or so !!

    ... and here I assumed this was all about making it easier to take off !! Yaaahahahaha !!

    Tunnels, do you ever draw sketches or drawings or make models !!

    With three or four surface piercing hydrofoils you can establish your takeoff attitude if you are afraid of rotating by yourself !! If you (not Tunnels) are OK with taking off all by yourself then only two or one surface piercing hydrofoils (read steps) are needed !!


    edit: just kidding, the tunnel will help lift your thing, whatever that is, out of the water. a little, at great cost, if you have lots of extra power ...

    !!!
     
    Last edited: Sep 29, 2015
  8. Sep 29, 2015 #48

    tunnels

    tunnels

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    wow !! do we live on the same planet ??
     
  9. Sep 29, 2015 #49

    tunnels

    tunnels

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    Its the main body of a amphibious plane as in the boat hull , not floats that are attached on legs as I envisage you are referring to
     
  10. Sep 29, 2015 #50

    bmcj

    bmcj

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    Do you want to have a discussion, or do you just want to insult people until they stop talking to you again?
     
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  11. Sep 30, 2015 #51

    TinBender

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    Tunnels,

    Since we have not seen any drawings, please forgive our lack of understanding. Are you proposing an aircraft similar to a Top Fuel Drag-boat with wings?

    Dragboats_SLDBA_Litchfield_IMGP7465f.jpg
     
  12. Sep 30, 2015 #52

    Dan Thomas

    Dan Thomas

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    More likely something like the Flightsail homebuilt of 50 years ago. Basically a tunnel hull, with a proper step, but still a poor performer which is why we never did see more than a handful of them.

    335-2.jpg

    There is very little new under the sun.
     
    Last edited: Sep 30, 2015
  13. Sep 30, 2015 #53

    Tiger Tim

    Tiger Tim

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    That Flightsail is quite the interesting machine. I picture it sitting three or four across on some big cushy couch with seatbelts...
     
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  14. Oct 2, 2015 #54

    Starjumper7

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    This plane could have pontoons on the lower wing in order to make it into a tunnel hull. Using pontoons shaped like those on a hydroplane would make it a nice wide tunnel hull, the best kind.

    The DO - 24 TT

    c0c17a86d0b6727ccc62781d9561a1c4.jpg 43589d1443567786-here-we-go-again-dragboats_sldba_litchfield_imgp7465f.jpg
     

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  15. Oct 2, 2015 #55

    Dan Thomas

    Dan Thomas

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    Cockpit was six feet wide, IIRC.
     
  16. Oct 2, 2015 #56

    RJW

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    Oh no! Tunnels got banned! HBA just got a tiny bit better.

    Rob
     
  17. Oct 2, 2015 #57
    Well... a bit less obsessive, at least.
     
  18. Oct 2, 2015 #58

    Starjumper7

    Starjumper7

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    Wow !! I didn't expected that !! and we were just starting to have fun !! ... but hey it's all good because I learned a new writing style !!
     
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  19. Oct 2, 2015 #59

    Topaz

    Topaz

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    Moderator Note: Just deleted a seriously off-color post. Remember, folks, we have minors regularly visiting this site. This isn't the bar or locker room. Please post with that in mind.
     
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  20. Oct 4, 2015 #60

    NoStealth

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    Tunnels' !! will live on in Schrodinger's box forever !!
     
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