Activity Stream

Activity Stream



  1. EDMO added a post in a topic Turtle deck   

    Mark,
         I have seen one that was split front to back, but with piano hinges - and it has leakage problems - yours sounds like it might be more waterproof.
    EDMO
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  2. EDMO added a post in a topic WTB (2) Matco MC-3 Master Cylinders   

    DJL,
         I just bought a set of MC-3 cylinders - didn't even know they existed - think they are 1/2 inch bore and 7 1/2 inches overall - Going to keep them and try them with my Grove brakes.
    EDMO
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  3. marksires added a post in a topic Turtle deck   

    Interesting. My turtledeck is two piece. It is split front to back, and has cam locs to attach the two pieces together diwn the center and at the sides.
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  4. EDMO added a post in a topic Turtle deck   

    Some prefer the Lexan TD to the aluminum, which hampers your vision.  Lexan top and aluminum sides works too.  The hinge will leak - so I have heard.   The one-piece TD can still be stored in the cockpit.
    EDMO
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  5. Deejayel added a post in a topic WTB (2) Matco MC-3 Master Cylinders   

    Disregard
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  6. dholly added a post in a topic Turtle deck   

    I believe the only reason a hinge was incorporated in the turtledeck was so it could be put in the cockpit for safekeeping when the wings were folded. The hinge leaks in rainstorms, lesson learned. My Aerotrek has a one piece t-deck and so will my Avid+. Personal preference so YMMV.
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  7. dholly added a post in a topic BRAKE LINE PRESSURES?   

    Herman-

    My KF3 braking w/ MC-1's was waaaay better than my KF4 w/ MC-4A's (same wheels and calipers but larger tires now). Lotsa talk about improvements made to pedal geometry when the cylinder attach tabs are on the rudder torque tubes themselves (ala all Avids and KF1-3) but, as you know, the KF4 master cylinders are attached to the floor ahead of the rudder torque tube so I am trying to figure the best way to get the recommended 2.5:1 leverage with the MC-4A's.

    With regard to using the top tab hole closest to the toe piece, didn't you experience interference of the clevis fork and pedal cross pivot tube? I seem to recall that was an issue with mine unless I angled the pedal uprights rearward by taking up a hole or two in the rudder cable adjustment straps. Also, I don't see where you mention which master cylinders you settled on, are you using MC-4A's or something different?

    Thnx, Doug
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  8. looped added a topic in Technical tasks   

    Turtle deck
    Hi all I'm building a mk4 and am wondering do I have to hinge the turtle deck or can I rivet the two halves together ? Ps this portion is missing from the build Manual I have thanks Rusty
    • 9 replies
    • 1,372 views


  9. dholly added a post in a topic Wing Trailing Edge Replacement   

    Nice! Avids look better with a straight trailing edge IMO, never been much of a fan for the old bat wing. One comment that I might add, which would seem particularly appropriate when using round stock for your trailing edge, is that some of the KF builders have added stiffeners between the ribs running from the rear spar to the trailing edge to help prevent deformation when shrinking the fabric. Carbon fiber arrow shaft blanks from the local archery shops seemed to be preferred for light weight and high strength.
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  10. akflyer added a post in a topic Wing Trailing Edge Replacement   

    Never thought of using tubing. Interesting! Hope it holds up for you, it looks good from here!


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  11. Wild Bill added a topic in Technical tasks   

    Wing Trailing Edge Replacement
        Leni,
     
        I wanted to Thank You for your help on an old thread that you did to your bird.
     
     
    Back Story !! 
     
       I purchased an Avid C Model MK IV, Serial # 1001. Thats what the paper work says anyway ! ?  The Avid looks to be
    a B Model with MK IV upgrades. Anyway it was built with the cable in the trailing edge and after some looking over
    your mods on your wing, I decided to convert my Bat Wing to a Straight trailing edge. Instead of using the standard
    trailing edge from Spruce, I bought some 6061 T6 seamless .375 od .035 wall and used it to make the trailing edge.
    I used the existing holes that the cable ran thru on the flaperon ribs and put in some all thread and ground some nuts 
    down so I could slip the tubing over it. I channeled the short rib to accept the tubbing there as well. I hysoled the nuts
    and all thread, inside the tubing and where the tube contacted the short rib and worked my way to the wing tip. After it was all on the wing, I went back and Hysoled all the joints again and made everything smooth. I have since covered that wing,
    and everything looks great. I'm going to start on the 2nd wing shortly and hope to have everything done including the paint
    in a couple of months. My flying buddy and I are working on covering his Kitfox 5 wings at the same time as covering mine.
     
    Here are a few pics of the mod to the wing and the last picture was from the For Sale Ad. It was taken in 08.  
     
    Thanks Leni for your help !!!
     
     





    • 10 replies
    • 2,124 views


  12. EDMO added a post in a topic 582 radiator cap PSI   

    Glad you remembered me! 
    EDMO
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  13. marksires added a post in a topic 582 radiator cap PSI   

    Wait, were you the one I had to keep sitting in the corner with the isosceles cone on your head???  
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  14. ChrisBolkan added a post in a topic 582 radiator cap PSI   

    I ran a 13 PSI cap, distilled water and 10% DexCool in the summer. Found that temps ran considerably cooler running less coolant. Back to 50/50 in the winter.
     
    PSIA  - Professional Ski Instructors of America.
     
    Chris
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  15. EDMO added a post in a topic 582 radiator cap PSI   

    Mark,
          Were you my Physics Professor?  I forgot his name, along with all the "good stuff" he thought he taught us! 
    EdMO
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  16. marksires added a post in a topic 582 radiator cap PSI   

    Not much to debate.  If you take a 13psi cap into outer space (vacuum), put it on the radiator (which also has vacuum in it in space), then start pumping air into the radiator, when the radiator pressure exceeds 13psi, the cap will pop.  Or, if you put the cap on the radiator at sea level (14.7 psi) and start taking it up in the atmosphere, when the ambient pressure drops below 1.7psi, the cap will pop.  When the pressure on the inside of the radiator is 13psi more than the pressure on the outside of the radiator, the cap pops.  It doesn't care why the difference developed, just that it is.
     
    Even more fun, take the radiator to the bottom of the deepest ocean (about 25,000 feet or a rough 12,250 psi pressure), then put the cap on.  As you raise it back to sea level, what happens?  Absolutely nothing.  Water is uncompressible, and the radiator would have been full of water at 25,000 feet.  Since the water wasn't compressed, no pressure difference occurs.  Of course, if you put the cap on an empty radiator at sea level, and then sank it to the bottom, you'd bring back up a small, flat radiator that wouldn't hold much water.  
    Mark
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  17. EDMO added a post in a topic 582 radiator cap PSI   

    I'm not getting any deeper in this stuff - This has been an ageless debate - Just threw it out to see what answers came back.
         My Physics Professor thought that he was one of the few in the world who knew the correct answer - and I forget what that was - must have been in a vacuum at the time?
     We then went into the leverage or force to move the earth - forgot to where!  
    EDMO
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  18. marksires added a post in a topic 582 radiator cap PSI   

    Nope. The air pressure is constant on both sides of the cap.  If you want to be technical, it is a 13psi differential cap.
     
    Mark
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  19. akflyer added a post in a topic Leni's curse   

    Randy, how is Saturday or Sunday looking for you? I'm thinking we need to try and make a fishing run when I get home.


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  20. akflyer added a post in a topic Leni's curse   

    come on up Larry, you can try the red, blue or green lures. I will use the one that works so you can take pictures of me catching fish while you beat the water

    A lot depends on water clarity and cloud cover. But that one is my normal go to for fishing kings and silvers in the rivers and ocean.

    I'm getting ready to take the wife and nephews out to try and catch some bass and catfish. Will see how we do soon.


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  21. thebriman added a post in a topic 582 radiator cap PSI   

    Thanks Sed!
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  22. Av8r_Sed added a post in a topic 582 radiator cap PSI   

    The OP was referring to a 582 installation.  The referenced links I believe apply to a 912.  The Rotax installation manual for the 582 calls out the 13 psi(g) pressure cap (section 11.3.4).  Also, in the operating manual, the max operating water temperature is stated to be 175°F and minimum for takeoff is 150°F.
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  23. thebriman added a post in a topic 582 radiator cap PSI   

    Correct,  13 PSIG not PSIA.
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  24. EDMO added a post in a topic 582 radiator cap PSI   

    Question:   Since the sea-level air pressure on everything is 14.7 psi, then is a 13 psi cap really a 27.7 pressure, because 13 psi could not overcome outside air pressure?
    EDMO
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  25. thebriman added a post in a topic 582 radiator cap PSI   

    Im in the same boat.  My 13 worked fine but leaks now, and I saw that they say I need an 18.  Im thinking Ill get a 13 again because it worked for 20 years so why mess with success.  
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