Activity Stream

Activity Stream

  1. 1avidflyer added a post in a topic Model 1 Kitfox   

    James T,  here is what I did with the Kitfox 4 I'm rebuilding.  Nice thing about this, is it doesn't make any changes to the original structure.  Well at least not in the sense of removing or cutting existing tubes.   Being that the Kitfox 1 is way narrower to start with, and has the smaller bottom on the door, probably a different way may be better there.  On the Kitfox 4, I went 4" wider overall.  On my Avid MK IV, 3"  JImChuk

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  2. TJay added a post in a topic Model 1 Kitfox   

    You are so so dead nuts on. One thing always leads to another. Seat pan, your making new doors, Fabric work is way more time consuming, Cutting tubes out and changing angles means transferring loads in different directions, but it does make it more roomie. The Model one is really bad had that tube right up against my hip,
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  3. TJay added a post in a topic soft brakes?   

    Ok got the brakes apart Don't see anything wrong with them other than lots of assembly grease left over inside. Also they don't look anything like the MC-1 rebuild kit shows? Any thoughts?

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  4. dholly added a post in a topic Model 1 Kitfox   

    I think this widening technique is very interesting. The Murle's Williams kit, and those D.I.Y. jobs modeled after it, end up with more shoulder room and a wide door sill as best I can see. TJay's approach appears to open up some additional hip room as well. Of course, one change can cause that trickle down effect and this would be no exception. Not a big deal if you use/make a sling seat perhaps, but I see fiberglass work in your future if you want the hard seat pan.
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  5. Ronin added a post in a topic Model 1 Kitfox   

    TJay, I'm about to widen my 3 and would like to copy what you have done rather than simply order the Murle kit. Could you post some additional pictures of it? Top weld, middle, front back and what tube size(s)? Pretty please?
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  6. Av8r3400 added a post in a topic NMLRA?   

    Thanks, Ed.
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  7. FredStork added a post in a topic L.G. bungee blues   

    this is one of the areas where I admit poor design of the Avid Flyer... 
    The good solution is to install the kind of gear Trent Palmer has but as any ideal solution it is expensive...
    My recommendation is to  REMOVE the merciless safety cable to avoid having it cut the seat struss in 2 and replace it by a tight bungee between right and left leg. I know, incomprehensible as explanation so here is a picture. You can use any heavy duty bungee cord, the stiffer the better actually. In the beginning of the deflection (ie normal landing) there  will be little tention on the horisontal bungee. Only at bad landings, great deflection, will the bungee enter in action (and save both prop and seat struss). 
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  8. TJay added a post in a topic Model 1 Kitfox   

    door bottoms are a little different but not by much. I have about 30minutes taxi time in it now and It feels plenty wide for me. Thing goes nice and strait down the runway I sure do like that. Gonna head to the airport soon here and pull the master cylinders apart, See what I can find.
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  9. whizzers added a post in a topic Avid Project for Sale   

    I believe it is a MK IV
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  10. 1avidflyer added a post in a topic L.G. bungee blues   

    I have the front of my sling seat tied to a piece of 3/4"  OD aluminum tube.  That tube is tied in 3 or 4  places to the seat truss where there is a space to put the rope.  This probably helps with giving more leg room, as the seat ends up further back.  JImChuk
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  11. EDMO added a post in a topic NMLRA?   

    Larry,  Give me some time to compile a list and I will send you a PM.  EDMO
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  12. Turbo added a post in a topic L.G. bungee blues   

    JimChuck, you will likely have to drill some holes along the tops of your seat truss plates for the seat lacing ( maybe you already have!)  I was thinking of putting some high-quality plywood in there, using zip-ties along the outer edges, letting the bungees contain it inboard.  On my bird, the original builder put in split rubber tubing as a buffer on the bottom seat truss bar, but used small hoseclamps to hold the rubber hose sections in place.  This abraded the bungees' outer fabric sheath, and strikes me as a no-no!  I suppose rubber cement is about all one can do, as even zip-ties would likely cause abrasion.
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  13. Av8r3400 added a post in a topic NMLRA?   

    Okay.  What ya got, Ed?
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  14. 1avidflyer added a post in a topic NMLRA?     national muzzle loading rifle assn.  I had to google it to.  JImChuk
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  15. Av8r3400 added a post in a topic NMLRA?   

    Okay, I'll bite.

    What is NMLRA?
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  16. EDMO added a topic in Hangar Talk   

    Anyone in NMLRA?  I have some rare ones to sell.  Send me a PM.   EDMO
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  17. 1avidflyer added a post in a topic L.G. bungee blues   

    The seat truss is a weak spot on the Avids and Kitfoxes.  At the very least, you should infill as much of it as you can with plywood.   Being as how it's in the shop, and near a welder, this may be a better approach.  I had 3" wide x .040" steel available.  That's why it looks like it does.  I wouldn't surprise me if over half of the Avids have had some reconstruction on the seat truss.  JImChuk 

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  18. EDMO added a post in a topic STOL Wing Rib Dimensioned Drawings or CAD   

    You might be able to buy a rib from Jim Chuk "1avidflyer".  EDMO
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  19. Turbo added a post in a topic L.G. bungee blues   

    Oops!  In my enginerdly focus I forgot that a loop or two lie on top of others,increasing the preload and likely nulling out my 0.4 inch greater maximum deflection I got over the build manual.  It is important, however, that the cables allow full stretching of the bungees first, before coming into play.  I would consider the 3" deflection allowance as a minimum, and make sure my cable-stops were a little longer.  They were too short on my bird.
    And yes, I did hard-land my bird.  It's in the weld shop getting fixed.  Uggh!
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  20. Turbo added a topic in Technical tasks   

    L.G. bungee blues
    I was in the process of replacing my bungees, and thought I'd do a stretch test with the old ones to see how bad they were, and check out the engineering behnd their use as the landing gear springs.  In my stretch test I used a fish scale and tape measure to determine the spring charactrristics, Force vs. Length.  I zip-tied one end and looped the other around the fish scale's hook, then stretched it with a boat winch.  What resulted was a sideways S-shaped curve, showing what anyone who has used a slingshot knows: that a rubber spring eventually stops stretching at some load, even as load is increased.  The Hook's law spring constant is high at the low-force end, but also becomes much higher at the high-force end, and is lower, but slowly increasing in the midrange.  Weird, but likely related to  the molecular structure of rubber.  
    Knowing that a spring's stiffness is inversely proportional to length, I then applied the stretch data to the loop geometry of the Avid's landing gear.  It's convenient that in re-wrapping the bungees, the force required is totally manageable, due to the 7 wraps used.  Of course this means we are applying a preload.  At this point we are stretching the bungees to 132% of their no-load length.  Of greatest interest to me was the realization that the bungees stretch up to 172% of their no-load length.  It is here that the bungees stop stretching, even as force is increased further.  Half of the bungee-centerline wrap distance is 8.5", and with 90" no-load length and 7 wraps (14 strands) each strand's no-ĺoad length is 6.43".  Stetching stops at 172% of no-load length, so full extension should be reached at 3.4", not the 3" prescribed in the build manual!  The safety cable is only there to prevent total collapse, but if it's shorter than full extension, you risk bending &  crimping the thinwall tube under your seat; the tube the bungees wrap around, if you land too hard.  The bungees wouldn't be able to absorb the energy before the merciless cable comes into play!  That cable applies a point load to the tube, not distributed like that of the bungee.  
    So those are the results of my analysis.  Am I nuts?  I'm sure others in the group have thought thru this as well.
    Making up my new bungees, a special thanks is due to Fred, who showed an elegant approach!
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  21. akflyerbob added a topic in For Sale and wanted, you got it, I want it   

    I am going to need a clutch, who might have one they
    want to get rid of?
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  22. Av8r3400 added a post in a topic Oshkosh 2018...Who’s going!   

    Yep.  The fun police have cracked down.
    We may have dodged too much notice down on the farm for now though...
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  23. 1avidflyer added a post in a topic Parting out A model Avid STOL wing   

    ??  JImChuk
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  24. dholly added a post in a topic Oshkosh 2018...Who’s going!   

    FYI for early AirVenture arrivals, I was checking the EAA site for some info today and notice there are new grounds rules in place for 2018. The restrictions will be in place from Thursday July 19 thru Sunday July 22. See more HERE.
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  25. dholly added a post in a topic Anyone have a LSRI-Airplane certification?   

    Hey, on the upside, it may not be a bad thing as I tend to be a bit foggy after a week and a half of OSH camping. 
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