FoxDB

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Everything posted by FoxDB



  1. FoxDB added a post in a topic Vertical Stab Tubing Model III KF   

    I believe the more important question is; what is the OD & wall thickness of both vertical tubes of a Mod 4? The builder of my mod 1 extended the vert to be as a mod 4, but when flying it, if the rubber was fully deflected at cruise the vert would deflect about 3" at the top. This made be uncomfortable so I added guy wires.
    Dave
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  2. FoxDB added a post in a topic Aluminum vs Plastic Fuel Tanks   

    My Kitfox I/II has aluminum Tanks, It has 700 Hours on the airframe and no leakage. The tanks are set with RTV I believe this was to prevent the flexing issue.
    Dave
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  3. FoxDB added a post in a topic Avid B model to MK4 Elevator upgrade   

    So Joey,
    VG's on wings next?
    Dave
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  4. FoxDB added a post in a topic Looking for information on Kitfox wheel hubs   

    An option I was considering was to buy the A3A Axles from Matco and bore a .75 Hole thru, then re-drill the caliper mounting plate to match the axle pattern. This saves a lot of machining. I learn years back it is less expensive to modify a mass produced part then to start from scratch.
    Dave
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  5. FoxDB added a post in a topic Rubber Engine mounting bushings   

    Neoprene is available in many hardnesses, Neoprene is not as resistant to oils and fuel as Nitrile or viton. Just a guess but I would be looking for something around a Shore A 40-60 Duro.
    Dave
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  6. FoxDB added a post in a topic Jacking your Bird...   

    I suspended mine from the hanger rafters with ratchet tiedowns attached at the forward spar carry through just inside the wing attach tubes. This I did while designing and building my bush gear. I did put a 2x4 frame under it just in case. And the wings were folded.
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  7. FoxDB added a post in a topic tail wheel springs   

    Herman,
    My 2 leaf tailwheel spring broke and I replaced it with the Kitfox 3 Leaf. I did not notice enough angle change to worry about. Here is a link to the discussion on teamkitfox: http://www.teamkitfox.com/Forums/showthread.php?t=3007&highlight=broken+tailwheel+spring
    Dave
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  8. FoxDB added a post in a topic Wanting to build a baggage area under turtle deck   

    I have taken better pictures of the baggage compartment. Here they are:
    Hope this helps
    Dave





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  9. FoxDB added a post in a topic homemade spring gear   

    Randy,
    The Protec PT2 added braces as you see in this drawing:

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  10. FoxDB added a post in a topic BAGGAGE DOORS?   

    Ed,
    I installed a baggage door after the fabric was on. I installed some pieces of oak between the stringer and the top longeron prior to cutting the fabric. Then I poly tacked the fabric to the stringer and the added oak pieces then I cut the fabric to allow wrapping around the stringer, vertical pieces and top longeron. That became the frame for the door. When I get the plane out again I will try to take better pictures than before.
    Dave
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  11. FoxDB added a topic in Avidfoxflyers General Hangar   

    Changing Jugs
    Hello All,
    I am considering changing the Cylinders on my 582 to cylinders from a 583 snowmobile engine. This would allow the use of the RAVE valves. I am to understand the fuel economy at reduced power settings is better. Any one have experience or opinions on the subject?
    Thanks Dave
    • 3 replies
    • 877 views


  12. FoxDB added a post in a topic F7A revisited   

    akflyer,
    Have you had a chance to see if F7a will fit early Kitfox?
    Thanks
    Dave
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  13. FoxDB added a post in a topic F7A revisited   

    Paul S,
    Do you know if these will work with a Kitfox Mod 1 thru 3?
    Dave
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  14. FoxDB added a post in a topic Wanting to build a baggage area under turtle deck   

    Just thought I would post some pics of the storage area I built in my Mod 1 Kitfox. Sorry for the poor quality photos there using my old cell phone camera. It is constructed of .06 Lexan with reinforcing at the hangers and an Aluminum outside door. The top of the door is pinched under the turtle deck.
    Dave




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  15. FoxDB added a post in a topic Let's talk gear geometry   

    SkyPirate,
    I believe it defintely would have gone slack at the outside. There is a bending moment on the axle which would transfer to the gear leg. This is a big contributor to bucking of the gear leg as shown in the picture posted by C5enginger. The best defence is to increase the diameter of the gear leg as I don't believe the tire could be any closer to the leg.
    Dave
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  16. FoxDB added a post in a topic Let's talk gear geometry   

    SkyPirate,
    Are you refering to the drop test?
    Dave
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  17. FoxDB added a post in a topic Let's talk gear geometry   

    Av8r3400 That is not what caused the fuse failure. It was the compressive load of the gear leg not being directed to the center of the longeron due to the lug hole being directly below the longeron.
    Dave
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  18. FoxDB added a post in a topic Let's talk gear geometry   

    BTW This is what happened to the fuselage with the hard landing;



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  19. FoxDB added a post in a topic Let's talk gear geometry   

    Just thought I would put in my 2 bits. I built a Bush gear for my Mod 1 Kitfox. I used die springs in a housing similar to the bearhawk gear. Designed it to take 3 G's before spring would go solid. I did a very poor landing. The gear held up fine but the fuselage failed. I don't believe the springs went solid because the safety cable cable ties were unbroken. I have considered building new tension members with bungees. I believe an Aluminum Spring Gear or bungees are the more forgiving as they provide the most flex (not including the new Highlander gas strut gear). Here is a link to the drop test video I did on my gear; http://www.youtube.com/watch?v=fvQtKQ5gHVY
    Dave  
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  20. FoxDB added a post in a topic Who will the winner be?   

    It does not seem like a good idea to add weight to the side of the struts. Granted close to the jury struts would help. But the reason strut diameters are increased with Gross Weight increase I believe is mainly due to buckling in compression (-G's). The side load caused by the extra weight (granted in up direction with -G's) would cause buckling at a lower compressive force. Just my 2 bits.
    Dave
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  21. FoxDB added a post in a topic UNDERCAMBERED RIB MODIFICATIONS   

    I am interested in this rib mod. Have you made much progress?
    Dave
    Mod 1 Kitfox
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  22. FoxDB added a topic in Avidfoxflyers General Hangar   

    My son's latest projects
    My Third son's 98 Chevy S10 with 3/4 ton Chevy Axles 4.3 Liter will have a Turbo 350 or Turbo 400 with NP203? (I think). Should be a good rock crawler with that amount of flex and the High Torque engine. The other pics are of my Tailwind fuse recovered by my youngest son during Christmas Break and off times at A&P school and finished in Polytone.
    I am a proud Papa.



    • 1 reply
    • 738 views


  23. FoxDB added a post in a topic Bush gear bending fuselage problems   

    I had a similar failure of my fuselage due to Bush Gear. I feel the problem is the placement of the gear attach tabs directly under the longeron. This causes a bending moment to the tab which caused torsion to the longeron. If you look at the placement on a cub it is offset to the outside to put the V Leg load directed to the center of the longeron. My solution was to add a brace tube to resist this bending moment. Attached are pictures of the damage.



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  24. FoxDB added a post in a topic homemade spring gear   

    It seemed like the Highlander bungies were a multi wrap design like Standard Avid/Kitfox bungies just on the strut.
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  25. FoxDB added a post in a topic Kitfox Bungee lengths and number of wraps   

    Hey Joey,
    What happened with the Airdale Bush Gear? Was it a problem with stiffness and lack of travel? If so have you considered building bungie struts?
    Dave
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