109jb

Members
  • Content count

    220
  • Joined

  • Last visited


Community Reputation

141 Excellent

About 109jb

  • Rank
    Advanced Member

109jb's Activity

  1. 109jb added a post in a topic My Kitfox gets 27 Desser's   

    If any of you guys that switched are willing to part with your Nanco N800's let me know. I'd be interested in buying them. They aren't available anywhere I can find.
    • 0
  2. 109jb added a post in a topic Wanted - Need a 912 ignition coil   

    Will do. Thanks for the tip
    • 0
  3. 109jb added a topic in For Sale and wanted, you got it, I want it   

    Wanted - Need a 912 ignition coil
    One of my ignition coils on my 80hp 912UL has the white primary coil wire broken off flush with the case with no strands sticking out to solder to. So, I need one ignition coil. If you have one you are willing to sell please let me know how much you would want for it before I wind up paying big bucks for one from LEAF.
     
    Thanks,
    John Brannen
    • 3 replies
    • 97 views
  4. 109jb added a topic in "other aircraft your working on"   

    109JB has another project
    So I should probably stay off Barnstormers. Found a  Glasair project with engine for a good price and got the boss's blessing to pursue it since this is an airplane I have wanted since it first came out. It was 1000 miles away from me so I jumped on a commercial flight, rented a 26 foot Penske truck and brought it hoe. Got it unloaded today. Came with an O-320-E2D. No logs or history, so will need at least a teardown and inspection but lots of work to do on the airframe anyway.


    • 3 replies
    • 147 views
  5. 109jb added a post in a topic Hauling a 912 rotax in Kitfox 4   

    Are you willing to pull the cylinders and put the casewith just rods sticking out in the passenger seat? Then the cylinders and pistons can go in a box in the baggage compartment.
    • 0
  6. 109jb added a topic in Avidfoxflyers General Hangar   

    Oil cooler or not?
    Hi guys. Working on my Kitfox 4 project with the 80 hp 912 UL and got to thinking. The airplane has an oil cooler installed, but looking at the Kitfox install manual, it has you just run 2 hoses. One from the tank pickup to the pump, and one from the bottom of the engine to the tank inlet. No oil cooler. I have also read about having to put on oil thermostats, tape over the cooler in winter, etc. I have also read about one at least that didn't have an oil cooler on a 912  UL.  If the temps don't climb too high without an oil cooler in the summertime, I would rather not even put it on for simplicity, and not having to mess with anything for winter flying. Just wondering about those that have experience with running a 912 without an oil cooler. How do the oil temps behave in summer temps. does it stay below the 230 top end for the normal range?
    Thanks,
    • 2 replies
    • 107 views
  7. 109jb added a post in a topic Bush gear failures   

    For my gear pictured below, the strut force will be given by:
    (Strut tension) = (Upward load at wheel) * 19.66/13.51. Assuming a tooth jarring 3g load @ 1200 gross that is 1200 * 3 / 2 = 1800 pounds upward at the wheel, so the strut tension will be 1800 *19.66/13.51 = 2619 pounds tension in the strut
     If I do like I guessed and use 5 pucks each 1.5" long for a total of 7.5" of polyurethane length.
    F = E * A * (delta L) / L0 = 4400 * 2.356 * (-1) / 7.5 = 1382 pounds at 1 inch deflection
    looking at the equation it will be linear, so 1382 pounds per inch deflection with a 7.5 inch starting length, so 2619 / 1382  = 1.9 inches of deflection
    Looking at an additional puck for 9" total yields 1152 pounds per inch equating to 2.27 inches of deflection
    The second picture shows what my gear would do at 1.9" extension of the strut, which would be an upward travel of about 3.2 inches of the wheel, not counting any tire deflection.
    Thinking I may switch to 9" of pucks so I can preload them a little. I'm thinking no sag at empty weight would be good and then once loaded will sag a little. My old Kitfox sagged a tiny bit when empty with the stock gear and stock bungees but they were old I'm sure. I would think new bungees would not sag. So at 9" of polyurethane I would give it about 0.26" preload which would support 300 pounds per side without sag, and that would give me 2 additional inches of extension before 3 g @1200.


    • 1
  8. 109jb added a post in a topic Bush gear failures   

    I do have a lathe but not with a 2" spindle bore. I will likely cut them a bit long and then put them in the lathe to clean them up.
    • 1
  9. 109jb added a post in a topic Bush gear failures   

    I bought the 2" OD, 1" ID, x 36" long, 90a durometer black tube from Mcmaster Carr that I had linked earlier in the thread.
     
    edit: how did youyou cut yours? I'm debating on whether to use my bandsaw or was thinking my miter saw might work better
     
    • 0
  10. 109jb added a post in a topic Bush gear failures   

    Nice. My polyurethane tube arrived today from McMaster Carr, and the 4130 tubing for the new struts is on the way from Wicks Aircraft. This weekend I plan to knock the new struts out. Maenwhile, here is what the project is looking like right now.

    • 3
  11. 109jb added a post in a topic Bush gear failures   

    Dusty, One more question for you. You said that you drilled the pucks like a revolver cylinder. Do you recall how many holes and what diameter you used?
    Thank you so much for your help and inspiration.
     
    • 0
  12. 109jb added a post in a topic Another Kitfox IV rebuild project   

    Got the final coat if blue on and got it unmasked.  Came out nice. Has good gloss but a little orange peel that was expected. Latex is a win so far for ne. 


    • 0
  13. 109jb added a post in a topic Bush gear failures   

    Dusty: So I have a 36 inch long (914 mm) piece of the McMaster Carr polyurethane tube on its way.  So I gather from your posts that the 4 pucks that are pictured are 50 mm OD (about 2 inches), 25 mm ID (about 1 inch), and 38 mm long (about 1.5 inches long. That would be 152 mm total length ~6 inches).  My thought is to make struts that allow up to 200 mm total length, start with 4 50mm long pucks and see how it goes. This way, if too soft or too much travel I could insert a solid spacer to replace one of the pucks. What do you think of this plan, being the resident expert?  Also, a question. Does your setup sag at all with the airplane empty.
    • 0
  14. 109jb added a post in a topic Another Kitfox IV rebuild project   

    Getting the color on her. The gloss of the latex is definitely better than polytone. The white is really hard to tell but the blue has a little orange peel which was not unexpected. It is about what I was expecting and is in the perfectly acceptable realm for my tastes. If I ever decide to I could color sand and buff it but I doubt I ever will. Overall I would call it a success but in doing the fuselage I have learned a few things and will be modifying the process a little. The results that Malcolm at wienerdogaero.com gets can't be argued with, but at least for me a few changes to his process make it much easier for me. For my rudder and landing gear legs I made the following modifications which work very well for me.
    I am starting to thin the first coat of primer a bit more than he recommends in order to make it easier to get more complete wetting of the fabric.
    On the primer coats on the fuselage I used the wienerdoaero method and brushed each coat on sanding between each coat with 320 grit dry sandpaper. I still brush that first coat on, and on the landing gear I also brushed several coats, putting the primer on in one direction and tipping it at 90 degrees. Ultimately I went to spraying the primer on. The primer is still thinned and sprays nicely, leaving a slightly orange peeled surface. The orange peel is much easier to sand smooth than the brush marks from brushing/tipping. On my rudder I am spraying all but the first primer coat and it is going very well. You can get a smooth finish brushing and sanding, but it is a lot more work in my opinion. Spraying i was also able to reduce the sanding interval to 1/2 by applying 2 coats (one cross coat) at a time, waiting until the first coat tacks up and applying the crossing coat. I have also gone to wet-sanding with 400 grit which again is much easier for me.
    Anyway, here is crappy picture of the airplane after the first cross coat of blue was applied and had dried about an hour.
     

    • 1
  15. 109jb added a post in a topic Brakes For Tundra Tires   

    MC-1 and MC-3 are already 1/2" bore. 
    • 0