Radio Vent ? please help

Discussion in 'Weapons & Pneumatics' started by Powder Monkey, Apr 29, 2008.

  1. Powder Monkey

    Powder Monkey Active Member

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    I have a MAV-3 on my radio box (plexy glass)looking to vent it so I don’t do the Hood impression and detonating from the inside out doing theDavy Jones’s Dive in record time while going down with all hands on board. So If you have any ideas suggestions for a vent keeping to the water proof ie out not in let her Rip .

    As all ways thanks again guys
     
  2. JohnmCA72

    JohnmCA72 Member

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    Drill & tap a 15/32-32 hole through the box. Screw the valve into the hole so that the vent is OUTSIDE the box, while the stem & servo that operates it are INSIDE the box. That's what I do with mine (except I use SMAV-3, which are smaller & use an easier-to-find 1/4-40 hole). Tapping can be eliminated by making the hole slightly oversize & using silicone caulk, etc. to seal it.

    JM
     
  3. Powder Monkey

    Powder Monkey Active Member

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    Isn’t the whole (vent) on the shaft on the MAV-3 I could be wrong as this is my first gun assembly you ever watch the three Stooges nyuk yuk yuk hey spread out there you have it and remember you cant fool me I'm an idiot [;)]
     
  4. JohnmCA72

    JohnmCA72 Member

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    Sure is!

    All the more reason to use SMAV-3 (besides being smaller/lighter).

    JM
     
  5. Powder Monkey

    Powder Monkey Active Member

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    any one ells[:D]
     
  6. Evil Joker

    Evil Joker Member

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    drill a hole in the top of your box stick small hose in it stick it under your box and water should not get in unless you sink upside down
     
  7. Evil Joker

    Evil Joker Member

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    the mav 3 exahust from button the smav dose not
     
  8. GregMcFadden

    GregMcFadden Facilitator RCWC Staff

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    "drill a hole in the top of your box stick small hose in it stick it under your box and water should not get in unless you sink upside down"

    that will not work, you are forgetting that air is a compressible gas, and if the pressure doubles at constant temperature, the volume roughly halves, and pressure doubles every 10 meters in depth. You WILL suck in water with that hose. the length of tube you require is a function of the internal air volume and the diameter of the tube you are using. I had two feet of 1/16" ID tube with my otterbox (I did this without thinking much about it) in my ole tirpitz and it sucked water right into the box at only 3 feet underwater.
     
  9. Powder Monkey

    Powder Monkey Active Member

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    archer what do yo use know
     
  10. GregMcFadden

    GregMcFadden Facilitator RCWC Staff

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    I usually have either forgone the radio box all together and waterproofed everything or I have used

    http://clippard.com/store/display_details.asp?sku=MCV-1

    with great success. Worked well in my Bayern, Yamato, and I boat. I would note that I used otter boxes that wouldn't loose their seal with only a few psi inside... not all home made ones are that good.

    as far as firing your guns on the way down, that would work if you cycle repeatedly, but since there is no "cycle repeatedly" when signal is lost setting in the receivers, once you are under water a few inches (in the case of 2.4) or several feet for 75mhz, you won't have that option.
     
  11. Powder Monkey

    Powder Monkey Active Member

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    I was thinking of using MCV-1but can’t find one locally and don’t want to pay clippard $10 on top of the shipping for there product[V] any other ideas
     
  12. GregMcFadden

    GregMcFadden Facilitator RCWC Staff

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    http://www.airtronicsinc.net/products.html try these folks, they are a distributor and have always shipped me stuff at reasonable prices. Unfortunately I don't have any left or I'd just drop one in the mail for you.

    as an aside, I buy my pressure lines through them because they have some stuff that has a bit higher of a pressure rating than the clippard stuff. Although I can't remember the manufacturer of the pressure line I bought from them last time
     
  13. Powder Monkey

    Powder Monkey Active Member

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    thanks arch [8D]
     
  14. GregMcFadden

    GregMcFadden Facilitator RCWC Staff

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    you might also check out part number 7757K11 at www.mcmaster.com
     
  15. Powder Monkey

    Powder Monkey Active Member

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    Found a place that sells clippard in a local town maybe they will let me drop by and grab it I like the fact I can screw the MCV-1 in to the box [^]