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Activity Stream



  1. EDMO added a post in a topic My Avid (model C+)   

    That paint job really caught my attention - looks good Mark.
    Thanks, EDMO
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  2. Luked added a post in a topic My Avid (model C+)   

    Nice plane Mark. Could you tell us more about it?
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  3. EDMO added a post in a topic Tricycle to taildragger   

    Thanks Luke,
         A drawing with dimensions would be nice to have in either "Technical" or "Files and Forms".
    EDMo
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  4. Luked added a post in a topic Tricycle to taildragger   

     
    OD is 1 5/8". Wall thickness looks like .0625". I don't have my digital calipers. Also, the powder coating makes it difficult to know exactly what the original dimensions were. Of course that would make it 1 1/2" ID. Hope that helps. I'm actually measuring all of the other dimensions. I'll try to make up a diagram showing dimensions.
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  5. EDMO added a post in a topic Aileron pivot tubes?   

    Nothing simpler than a guy on each wing tip pushing up to lift the plane - Nothing better than two gals in bikinis doing push-up, pull-down exercises on each wing, while I hang on to the big stick!
    EDMO
    Yes, I wish I could see what tubes the Tailwind uses!
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  6. EDMO added a post in a topic Brakes for use with ABW 26" tires   

    Ron,
          The set I have (calipers and disks) came off of a Piper Seneca Twin - The disks are probably a little thicker than you need, but dispel heat without warping like the thin disks.  If they need refinishing at some time, you have material there to turn off and don't have to buy new ones like you would with thinner disks.  Am I making sense of this?  They are a matched set.
    EDMO
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  7. Luked added a post in a topic Aileron pivot tubes?   

     
    What, no wind tunnel??
     
    I was just thinking of something simple to attach the torque tube to that could simulate a flexing wing.
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  8. EDMO added a post in a topic Tricycle to taildragger   

    Can you post or PM the inside diameter and wall thickness of the big tube?
    Thanks,  Ed
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  9. Luked added a post in a topic Tricycle to taildragger   

     
    The only trigear parts I have are in the fuselage structure. I don't have any of the parts to the actual gear. I'll try to save it.
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  10. C5Engineer added a post in a topic Brakes for use with ABW 26" tires   

    Tires are never big enough! I think you will be fine on the 26s unless your doing a lot of rocky landings. Don't be afraid to air them down. It's night and day difference with the Nancos between 8 psi and 5.
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  11. marksires added a post in a topic Tricycle to taildragger   

    Please save if possible, document if not. I'd be interested in the trigear parts also. Would like to convert my taildragger to trigear. I dont have a grass runway and the taildragger is a real handful.
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  12. RDavidson added a post in a topic Brakes for use with ABW 26" tires   

    I checked, I do have the 2" single puck Cleveland's.

    Ed, I am interested in your double puck brakes. How much would you need for 'em?
    Ed you mentioned that I would probably need different discs, what would you suggest?

    Thanks Randy and Chris. Am I screwing up going with 26" tires? I want to be able to land just about anywhere. I thought that 26" would be plenty big, but I have seen guys talking about 29" and 30" being great! Let me know what you guys think.


    Thanks again,
    Ron
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  13. Luked added a post in a topic Tricycle to taildragger   

    I guess I just have a hard time dragging around that extra weight for no other reason than the idea that it might get used some day. For some reason I just don't like it. Call it a personal flaw
     
    Not sure if I could get it out of there in a very usable condition. I could try. I'd be happy to document the geometry of the thing, and wall thicknesses though so that someone could re-create it from new tubing though.
     
     
    Just for reference, here is a picture of my plane in the front. Sorry I don't have a better picture right now. My daughter recently stepped on my camera, and it doesn't work now. Need to get a new one.
     

     
    Here is a picture from a recent thread showing a taildragger.
     

     
     
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  14. Av8r3400 added a post in a topic Tricycle to taildragger   

    Cutting out the sub assembly is not difficult and will cut unnecessary weight off the front of the plane.  If you are careful and neat while cutting, the sub assembly can be sold to someone who wants it.
     
    I don't remember if replacement tubes will be needed to be welded back in or not, but this too would be very easy.
     
    I say go for it.
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  15. EDMO added a post in a topic Aileron pivot tubes?   

    Like having one guy push up and pull down on wing while the other works the controls?  I don't have a wind tunnel!
    EDMO
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  16. EDMO added a post in a topic Tricycle to taildragger   

    You might want to make sure it is still useable, since there are guys looking for the nose gear and mount.  But, IMO, you are lessening the resale value of your plane for no reason.  Why not kept it convertible?
    EDMO
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  17. Luked added a post in a topic Aileron pivot tubes?   

    Sorry Ed, I missed that. Binding would be a big concern with that setup. Maybe some type of test jig to test for binding in different load conditions could be helpful.
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  18. Luked added a topic in Avidfoxflyers General Hangar   

    Tricycle to taildragger
    I'm waiting on wing parts right now, so I thought I would work on something else. My Plane has the front mount for the trike gear. Has anyone removed this, and switched it to the tail dragger only style structure? Anything to watch out for? I'm about ready to remove it and put in the proper tubes to replace it, but thought I'd ask first. 
     
    Thanks,
    Luke D.
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  19. EDMO added a post in a topic Aileron pivot tubes?   

    Luke,
    Thanks for the Post -  I have been thru the modules of elasticity bit so many times it hurts.
    I got my ideas from the old WW2 German planes, which had flaperons and split ailerons/flaps, which Steve Wittman also copied with the tailwind controls.
    My worries about flexing were not concerned about loads, but about stiffness of the steel being more than the aluminum, and this part has to flex with the wing, as the flaperons do.
    Almost positive that I will go with the aluminum tube with a heavier wall.
    For torque, the shortness of the ailerons, being out of the prop blast, will probably not be as much, and certainly not  more than the full-length flaperons, since about all they have to do is control the roll of the plane.
    The most torque pressure will be on the flap portions, and that will be a 1 1/2 inch aluminum tube - lots stronger than the flaperon tubes.
    Every time I get worried about design and building, I go to the big-screen TV and put the tape in about the early flying machines and the crazy things that they tried to fly with, and convince myself that I am maybe not that stupid! 
    EDMO
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  20. marksires added a post in a topic My Avid (model C+)   

    BTW - that is the hangar in California I picked it up from.  My hangar isn't neat and pristine, but it isn't full of garbage (although I wish I'd snagged that set of floats on the back wall).
     
    Mark
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  21. marksires added a topic in Avid fox flyers pics and vids   

    My Avid (model C+)

    • 11 replies
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  22. Bandit added a post in a topic Avidfoxflyers Oshkosh BBQ   

    Let's have it on the main show ground. At the seaplane base everybody eats and leaves. If its hot you can not stand it in those trees. This way it might be easier for more people to attend.
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  23. Luked added a post in a topic Aileron pivot tubes?   

    Hi Ed,   Since no engineers have answered, I'll add my 2 cents.   Disclaimer: I'm not an engineer. I did take 2 years of engineering classes when I was younger, so I picked up some basic concepts, but it was almost 20 years ago. I also think engineering is very interesting. Hopefully a qualified engineer will chime in though.   Anyway, I found this link using google:   http://www.engineeringtoolbox.com/torsion-shafts-d_947.html   If you scroll down to "Example - Shear Stress and Angular Deflection in a Hollow Cylinder", you can see how to calculate the maximum stress, and angular deflection for a hollow shaft. There is also a link on that page to shear modulas numbers for various materials. You can use google to find more.   I also found an online calculator that does the math for you:   http://www.amesweb.info/Torsion/TorsionalStressCalculator.aspx   You'll need to know the Ultimate Shear Stress (USS) for the material you are using. For steels, I think it's 60% of Ultimate Tensile Strength (UTS). You want to make sure that the calculations above don't put more stress on the part then the material used can handle. You'll also want to use some factor of safety.   You mentioned flexing, so I assume you mean angular deflection. Long shafts can flex out of alignment, but that's more difficult to model, and if your torque tube is supported at multiple points it probably won't be an issue. Anyway, the example in the link above covers angular deflection.   To me, the most difficult part of these kinds of problems is not determining if a part is strong enough to withstand a particular load, but determining what types of loads the part will experience, and how severe. I guess that's kind of the art of engineering. How strong should a bicycle frame be? How high of a jump will a kid take it off of?   The load on your torque tube could be a fair amount different than the load on a stock flaperon. If it is connected to the aileron by a pushrod, the length of the arm on the torque tube and the length of the control horn will affect the torque in the tube. If your tube is directly driving the aileron (like a flaperon), it could still be different from the stock flaperon because the flaperon might be getting some aerodynamic balancing that the aileron is not. Also, differences in chord length would cause different loads.   Basically, figuring out the loads is the hard part to me, calculating the stresses and deflections is easier. That's probably enough rambling. Hopefully that's at least a little helpful. Like Paul said, I'm not an aircraft designer. My brother happens to be a civil engineer, so at least on structural problems, I can have him double check stuff I do, and he can tell me if I'm on the right track or not.   Luke D.   Edit: I see you are running the aileron torque tube through the flap torque tube. Sounds like a Tailwind. Maybe you should see if you can have a look at a set of Tailwind plans. I think you can still buy them too.
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  24. EDMO added a post in a topic Aileron pivot tubes?   

    Paul,
        It is probably over my head too - just trying to tread water - reading a lot of engineering and design stuff, but it don't cover everything.   These are the pivot tubes - not push/pull - There are 5? support hinges total on flaps and ailerons - just like the flaperon hinges - the aileron tube runs thru bushings inside the flap tube.   Guessing there is a lot of wing deflection in these birds, so aluminum may be more flexible and forgiving?
    Thanks,
    EDMO
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  25. wypaul added a post in a topic Aileron pivot tubes?   

    I am no engineer ED but my  other plane (Q2) uses aluminum for both the elevator and the ailerons.  Have you made provisions for a mid-span support or will they only be supported at the ends only? I wonder what Just does with theirs or Rans on the S6 or S7.  I have to admit aircraft design is over my head.
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