Activity Stream

Activity Stream



  1. EDMO added a post in a topic Wanted a Rotax C redrive   

    I am guessing that the redrive off of an upright 532 would not work?
    EdMO
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  2. EDMO added a post in a topic NEXT WISCONSIN FLYIN ?   

    Thanks,
         Midwest Antique....Members only  -  Broadhead, WI - Sep 6-7-8 or close to that.
    EDMO
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  3. Av8r3400 added a post in a topic NEXT WISCONSIN FLYIN ?   

    http://www.dot.state.wi.us/travel/air/fly-ins.htm

    Check this site. Wisconsin dot registered fly ins.
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  4. EDMO added a topic in Hardcore Avidfoxflyers   

    NEXT WISCONSIN FLYIN ?
    I think there is a gathering in Wisconsin in September - Can anyone give me info ?
    Possibly the J3 will be going there.
    EDMO
    • 2 replies
    • 746 views


  5. akflyer added a post in a topic Wanted a Rotax C redrive   

    The e box puts 12 more pounds as far out on the nose as you can get it.. I doubt that's what you want with the weber engine.. I would go C box if it was me.
     

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  6. EDMO added a post in a topic Just joined the Fat Avid Club   

    Thanks Chris.  Hope something works for you.
    EdMO
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  7. EDMO added a post in a topic Material for making ribs ?   

    I thought I had posted this once, but it disappeared somehow:
    I stated that Govment Specs and methods may be 40 or 50 years behind the technology.  
    I think that a carbon fiber laminate would be far superior to any plywood ribs.
    EDMO 
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  8. Trackwelder added a topic in For Sale and wanted, you got it, I want it   

    Wanted a Rotax C redrive
    I am looking at using a Yamaha 4 stroke snowmobile engine in my Avid in Place of the 582 and would like to use a C redrive instead of the E that I currently have, unless someone can come up with a good reason that the E box will work.
    • 19 replies
    • 2,564 views


  9. Guest added a post in a topic Just joined the Fat Avid Club   

    No worries Ed!
     
    I am going to pick up the cowl and see if I can make it work. My friend Max has a Fat Avid top cowl I can have. I only require a bottom. It does not look to me like Luke's cowl is aMKIV, So the bottom may or may not work for me.
     
    At this time my plan is to get the cowl from Luke. I must have it in hand. If I can use all or part of it great. If not I will to greyhound it to you. (I have experience doing that sending Willis his cowl) ) My goal is to get me set up with a workable cowl, but NOT to break Luke's cowl set up if possible, because top and bottom match.
     
    Bottom line is if I don't use the cowl, and you are willing to maybe help with my gas to get it and pay greyhound, it's yours.
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  10. Tree top pilot added a post in a topic Material for making ribs ?   

    Thanks for all the info on plywood ! 
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  11. EDMO added a post in a topic Material for making ribs ?   

    We have certainly been taught that "MIL-SPEC is the 'APPROVED' material" - but being "experimental", we can use anything from cardboard to I-beams - to each his own.   Kit Manufacturers may have a little more responsibility for their product, but the final liability is with the builder.
    EDMO
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  12. dholly added a post in a topic Material for making ribs ?   

    Lol, the Luan skin ply off a 10 y.o. hollow core closet door from Bargain Outlet would probably outlast me. McBean understandably has to cover his ass on part and material sales so no surprise there.
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  13. EDMO added a post in a topic Material for making ribs ?   

    Thanks for the info Doug,
          I know things have changed since I was taught by Korean War Vets - I think they had just approved FPL-16 at the time, and printed in the books as an alternate to the old glues.  Maybe a young someone can find out how long my Finnish Birch and Kitfox ribs lasted someday after I am long-gone.
    EDMO
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  14. dholly added a post in a topic Material for making ribs ?   

    Ed,

    As I understand it, "aircraft grade" ply as defined by MIL-P-6070B spec requires cross banding plies at 90* to grain and edge. However, I believe plywood grading overall is primarily dependent on bonding adhesive and procedure. That is considered most critical because wood does not have a fatigue life limit and if properly preserved and stored, will last indefinitely. Adhesive, however, can deteriorate with time and must be suitable for the application i.e. non-elastic, not corrosive to the wood fibres, not subject to fungal attack etc. Also, strict adherence to manufacturer recommended shelf life, mixing instructions, spreading requirements, pot life, clamping requirements, temperature and humidity limitations, gap filling properties etc, etc. come into play. All of this is important because in forming the joints the adhesive does not bind one wood surface to the other, rather, each surface is individually bound to the glue. In wooden structures the strength of the glue line must be greater than that of the wood, whereas in adhesive bonded metal structures the glue line will most likely be weaker than the metal. Bonding adhesives for plywood are generally classified as:

    ‘A Bond’ (WBP) - a water and heat proof glue line produced from phenolic resins that will not deteriorate under extreme conditions (WBP - Water Boil Proof adhesive, must withstand 3 hours of boiling in water). It is readily recognisable by its black color. Type A bond is always specified for exterior, aircraft, marine and structural plywood.

    ‘B Bond’ - produced from melamine fortified urea formaldehyde resin and suitable for limited exposure.

    ‘C&D Bond’ – is produced from urea formaldehyde resin and suitable for interior use only.

    Most common A Bond adhesive used in aircraft and marine grade plywood construction is Hot Press Thermoset Phenol Formaldehyde Resin (Tego-film), although Resorcinol Formaldehyde Novolac Synthetic Resin Glue, Urea Formaldehyde Synthetic Resin Glue, Type 2 Hot Press Urea Resin Glue or Araldite AW 134 Epoxy Resin based adhesives are also used to lessor degree.

    Note: "Baltic Birch" multi-ply all birch w/ solid inner plies is often described by sellers or considered synonymous with aircraft grade plywood, but is not true aircraft grade when constructed with cold curing acid catalysed phenolics, urea-formaldehyde resin, melamine fortified urea-formaldehyde resin or casein milk and animal protein derivised adhesives. Beware import plywood quality if not stamped certified, seek plywood from US mills manufacturing with domestic cores and domestically cut veneers if possible.

    Without getting more wonky, in general I think it would be safe to say:

    Aircraft grade ply is cross grain hot glued under pressure with waterproof structural glue and cannot have voids in the inner layers. Can be WBP or better. Minimum 5-ply for 1/8", 7-9 ply better. Aircraft grade uses all top quality plies of the same species. Also aircraft plies are “balancedâ€, that is with an odd number of plies with the same amount of fibers in the crossed direction to minimize warping. WBP ply is best for structural uses like rib web.

    Marine grade ply is cross hot glued under pressure with waterproof structural glue and can have minor voids in the inner layers, but all voids must be filled, making it much stronger than lesser grades of plywood. Marine grade can be WBP or better, also min. 5-ply for 1/8". Marine grade is often denser (therefore, heavier) than aviation grade.

    Cabinet grade ply does not require structural waterproof glue, will have voids in the inner layers where you cannot see them, making the plywood weaker. Often with cabinet grade plywood the back side will have voids that have been filled. Can be as few as 3-ply, however, the lesser grades of ply with voids and lower quality internal veneers are not consistent in strength and weight and are not suitable for structural applications in aircraft.

    Tip: For a less expensive but still very strong alternative to aircraft grade birch with little weight penalty, look for a marine grade Okoume ply. Okoume ply made in France by Joubert is the highest quality marine plywood available today and is certified by Lloyd's of London to be manufactured to the BS (British Standard) 1088. My local specialty lumber shop carries full 4'x8'x6mm (1/4") sheets of Grade AA Joubert marine grade Okoume ply for $81.55.
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  15. EDMO added a post in a topic Just joined the Fat Avid Club   

    Chris,
          I didn't mean to cut in line in front of you - I just wanted my name on the list in case you didn't get the cowl.
    EDMO
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  16. Luked added a post in a topic Just joined the Fat Avid Club   

    No problem Chris. Hope it works out for you.
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  17. Guest added a post in a topic Just joined the Fat Avid Club   

    Thanks for posting the pics!
     
    I will check measurements against my plane after work. It looks awesome if I can make it work. And YES I can drive down to get it (and buy you dinner) if it looks like I can use it!
     
    Many thanks!
     
    Chris
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  18. EDMO added a post in a topic Material for making ribs ?   

    We were taught at Aviation school that aircraft plywood is 45 degree ply and not 90 like standard plywood.
    My Kitfox 1 and 2 ribs held up just fine until they hit something - whatever they were made of.
    EdMO
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  19. dholly added a post in a topic Material for making ribs ?   

    According to John Larsen, "Avid originally used a 9 ply about 6mm plywood made in Finland at great expense. Kenny Schreader, when he ran Sky Raider, went to US cabinet grade maple veneer 7 ply which was 5/16 as I recall. I have not heard of any Sky Raiders falling out of the sky due to faulty plywood. The shrunken fabric holds the wing together, so use a plywood you feel comfortable with."

    IIRC, KF 1-3 used aviation grade Mahogany 9-ply w/ 90*degree ply layup for rib webs, and either aviation grade Spruce or Birch 5-ply for cap strip material. If you opt out of the oem or ACS aviation grade rib or cap strip material, seek out Grade 1 or AA Marine birch ply as it will have 90*degree ply orientation, higher quality sanded face veneer, no core voids plus a fully waterproof structural adhesive. Birch is also stronger than mahogany or spruce, I used a 1/8" Marine grade birch 5-ply for my floorboards sourced from a local specialty lumber yard, it would probably work fine as cap strip material too.

    Just a thought, what if you used a waterproof glue and carefully laminated together two layers of locally sourced 1/8" Marine grade birch 5-ply ie., less expensive than the ACS rib material but more than adequate strength wise? Don't recall what it cost but it wasn't terribly expensive and no shipping cost.
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  20. Luked added a post in a topic Oshkosh 2014 Picture thread   

    I also like to take some pictures of various aircraft details. Here are just a few. I was too busy this time to take very many.
     
    Super STOL:
     
    brakes

     
    Aileron hinge

     
    Flap track

     
    Joint between Slats

     
    Tailwheel

     
    Trim

     
    Wing tip

     
    Gas tank

     
    Sky Raider aileron pulley and cable

     

     
    I've got some more, but they are on my phone. I'll see if I can get them uploaded some time.
     
     
     
     
     
     
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  21. Luked added a post in a topic Oshkosh 2014 Picture thread   

    Here are a few pictures I took. Wish I had taken a lot more.
     
    Super STOL

     

     
    B-25

     
    Corsair (my favorite warbird)

     

     
    T-28

     
    Sky Raider

     

     
    Questair Venture
    (side note: I read a magazine article about the Venture, and the author said that he thinks someone saw a cartoon drawing of an airplane and thought it was an engineering drawing  )

     
    Ford GT (not an airplane, but pretty cool)

     
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  22. dholly added a post in a topic WTB - Rotax B gear box   

    Robert - Just curious why you would opt for the B box over a C box? I understand the weight penalty but the C box allows improved torsional vibration dampening and 2x the prop weight mass inertia, a requirement if you will ever use a larger diameter or heavy Warp prop IMHO. After trying multiple prop/gearbox combinations, the original builder of my KF3 removed his 2.58 B box in favor of a 2.62 C box w/ 68" 3-blade and never went back.
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  23. EDMO added a topic in For Sale and wanted, you got it, I want it   

    Kitfox Grove gear mounts
    I have a set of Kitfox/Grove maingear mounts that Skystar used on models 5,6.7.  for the 4 5/8 wide 1550 GW gear.  This is the type that has nylon radius inserts.   Anyone interested can PM me for info / photo.
    Also have a set of 3 Cessna wheelpants for sale.
    EDMO
    • 0 replies
    • 480 views


  24. EDMO added a post in a topic SCRATCH BUILDING   

    Thanks Leni,
          Just had to make an unforeseen engineering change - cutting tubes, and heading back to weld shop!   Time - and Time Again!
    EDMO
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  25. Deejayel added a topic in For Sale and wanted, you got it, I want it   

    Maule 6" tailwheel for sale
    TW-101. 6"solid wheel.

    I'll toss it on here before ebay

    $205 shipped. OBO

    Text me for pics.

    225 two hundred 5966
    • 0 replies
    • 1,048 views