nlappos

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About nlappos

  • Rank
    Advanced Member

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  • Gender Male
  • Location Cedar City, UTAH
  • Interests flying, astronomy, reading, family

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nlappos's Activity

  1. nlappos added a post in a topic Replacing hks700 for rotax   

    The Rotax 670 is a nice alternative to the 582 - same mount, fits like a glove. Has 91 horsepower, needs more cooling than the 582.
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  2. nlappos added a post in a topic trim lever   

    This post saved me a lot of time!
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  3. nlappos added a topic in Rotax and other engines   

    New Unsinkable Carb Floats?
    I was wandering through Barnstormers when I saw this ad. Might be a cure for those of us with bad Bing carb floats
    https://msacarbs.com/product/rotax-bing-blue-epoxy-float-ms80-430/
     
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  4. nlappos added a post in a topic New early Model C project   

    jjflyer,
    Your plan is a great one, but I also suggest that you also buy an already built Avid so you have one to fly now. If you wait to build your C model, you will miss a few great years of flying. Even a complete one without an engine will get you in the air in just a few months.
    In any case, welcome aboard and good luck!
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  5. nlappos added a post in a topic Kitfox crash on utube   

    One observation from that crash in the first video is how tough the airframe is. The cockpit area has largely the same dimensions, because the steel frame work is quite strong. 
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  6. nlappos added a post in a topic Kitfox crash on utube   

    The FAA departure stall maneuver is designed to help train us in this scenario, to recognize the signs, fix the problem and fly the aircraft out of the danger area. The FAA learned the hard way, after dozens of stall accidents, that the "normal" way to use the controls ("stick back, houses smaller....") is simply wrong.
    I have bought a copy of "Stick and Rudder" for each of my students back in the day, the author really describes this all so well.

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  7. nlappos added a post in a topic Tailwheel spring design   

    I used a double design, by having a second shorter spring bent to the same angle, but about 2" shorter than the main spring, and placed on top of the first. I clamped the two with a small sandwich to hold them in place, works fine. see the shot below

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  8. nlappos added a post in a topic Shipping engines   

    Simplicity is essential. Rotax Rick says to use a big plastic tub, lots of pillows, and ratchet tie-downs. I did this to send my 582, and he used it to send back the 670, and it was perfect. He sends and receives dozens of engines this way. I used Fedex Ground, cost about $250 each way across the country (Utah to Florida), with declared value of $5000
    Zero bother, too. Here is Rick's discussion:
    https://rotaxrick.wordpress.com/shipping/
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  9. nlappos added a post in a topic Avid MKIV Fuel System Set Up   

    Here is my Mk IV system, I added the fuel boost pump with my 670, and leave it on full time. I used to have poor starting when hot in my 582, all now gone with the pump. Must have been vapor lock.

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  10. nlappos added a post in a topic My Wheelbarrow is getting closer   

    I saw this in Star Wars, didn't I?

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  11. nlappos added a post in a topic Tailwheel spring design   

    I had Wausau Spring make me a tail spring, they did a good job.
    http://www.wausauspring.com/
     

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  12. nlappos added a post in a topic MK4 Engine swap   

    The Rotax Rick 670 is a viable alternative, and a drop in. I uses the 582 mount and fits like a glove, produces 91 HP and starts and runs great. It costs about $3750 plus your old 582 for a zero time 670.
    The whole story:  http://avidfoxflyers.com/index.php?/topic/5734-new-rotax-670-install/
     
    Rick's pricing page:  https://rotaxrick.wordpress.com/pricing/
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  13. nlappos added a post in a topic Bush gear failures   

    109jb,
    I think your math looks great and we agree!  
    I think an easy way to check the poly disks is to just put the diagonal strut together, and put 2400 lbs of tension on it to see the deflection. A simple rig with a hydraulic cylinder and a strong mount should do the trick. Or you could pick up a VW beetle with it!
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  14. nlappos added a post in a topic Bush gear failures   

    I did some trigonometry on the gear dimensions and angles in your sketch, which seems to agree with the basic dimensions of my Highwing llc (Fitt) gear, shown below. The force on the diagonal rod with the disks on it is about 2400 lbs of stretch on the rod during a reasonably hard landing (3 g's, about 8 feet per second sink rate).
    That means the poly pucks will see a compression of about 2400 lbs during that event. For my springs on the Highwing gear, that compresses the steel by about 1.5",  and at 3.8 G's, maybe 12 feet per second, it compresses the spring completely.
    It might be great to see what the compression on the poly pucks is at that load, 2400 lbs, just as a comparison. the durometer doesn't measure spring rate at all, it is a measure of how the material resists being dented by a sharp pressure. My guess is the stuff is very stiff and would work well as a stiff spring.

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  15. nlappos added a post in a topic Avid MKIV Bush Gear with mods   

    Looks like great gear!
    Here is my measurement of the Lowell Fitt (Highwing LLC) gear that I bought, installed and use on my Avid Mark IV. Very similar geometry. The gear is fantastic, tracks straight on rollout, smooth touchdowns. My calculations say the gear is good for about 12 ft/sec landing sink speed, much more than Part 23.

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