nlappos

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About nlappos

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    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 NEWBIE   

    Duke/Mark makes a great point, the Rotax 670 has 92 horsepower, but is only about 10-15 total pounds heavier than the 582. I believe this is many pounds lighter than the 912. I installed a 670 in my Mark IV and have detailed data on it, as I am sure Dan does. Don't hesitate to reach out. 
    Here is a link to the many posts on the 670 that I made a few years back:  New 670 Engine Install and performance:
    http://avidfoxflyers.com/index.php?/topic/5734-new-rotax-670-install/&page=1
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  2. nlappos added a post in a topic Weight and Balance Issues, Ballast.   

    Let me recommend a possible rope out of the tree. You can get airworthy by temporarily ballasting within the 14.28" aft cg, and then flight test your way back to the 16.0" I believe the larger horizontal tail and vertical tail will let you go farther aft because you will have more horizontal tail volume to control the aft cg.
    So temporarily ballast to 14.28" with weights hung on the engine mount. Then during the initial 40 hours test further aft by reducing the weight as you test the critical conditions (slowing to unaccelerated stall, landing flare, cruise speed longitudinal stability).
    All legal and all wise.
    How much bigger is your horizontal stab?
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  3. nlappos added a post in a topic Broken Rubber Donut on C Box   

    Gerry Visel,
    I changed my starter the last time by going into the box behind the panel, and it worked!
    How to pop in a new starter:
    http://avidfoxflyers.com/index.php?/topic/6443-how-to-pop-in-a-new-starter/
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  4. nlappos added a post in a topic VMAX 600 Questions   

    The Skytrax gearbox has several available ratios, including 3.45:1. It is relatively proven and available, might get rid of a bunch of engineering problems in one easy solution.
    I am an aerospace engineer, and I think coming up with a reliable belt reduction at those rpms is a real challenge.
    https://www.skytraxusa.com/yamaha4cylinder
    https://www.skytraxusa.com/yamaha3cylinder
     
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  5. nlappos added a post in a topic Aircraft registration problems   

    I think you are referring to block 15 "Aircraft manufacturer" where you put in the "assembled from parts".  The actual answer is that you are the manufacturer. Just put your name and as aircraft type "Avid Flyer". At least that's wat my registration has.
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  6. nlappos added a post in a topic Bungee questions   



  7. nlappos added a post in a topic Sky Raider Ultralight (fat) FOR SALE   

    Brian, thanks for the clarification. It is amazing that that nice looking aircraft is so light!
    Here in the Cedar City area the Wx is great, except a bit windy lately. I know all about that "if they are shooting at you" part, my best war stories involve North Vietnam's finest!
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  8. nlappos added a post in a topic Sky Raider Ultralight (fat) FOR SALE   

    Brian, I bought my Avid from another member of this site, we mutually executed some EAA paperwork expressly used to release any liability. This ment the aircraft remained registered and airworthy, so it took no effort to fly it, and yet the liability concerns were no problem. EAAA says nobody has ever won a suit on an experimental homebuilt, and virtually all experimental home builts are sold with the intact certificate and registration. But local non-aviation lawyers get the cold sweats!
    Here is a page that discusses it, and even has the legal forms:  https://www.eaa.org/eaa/aircraft-building/builderresources/next-steps-after-your-airplane-is-built/selling-and-buying-articles/part-1-protect-yourself
    If a buyer has to regenerate the airworthiness it is a big deal, and the price of the aircraft drops due to the uncertainty and work required. It also means the list of buyers shrinks to those who are inspectors or A&Ps and are comfortable with the FAA process.
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  9. nlappos added a post in a topic WTB spinner   

    Aircraft Spruce has them
    https://www.aircraftspruce.com/catalog/appages/skullcap1.php
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  10. nlappos added a post in a topic WTB spinner   

    Aircraft Spruce has them in stock
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  11. nlappos added a post in a topic lift struts   

    Here is the info I used for replacing the struts on my Avid Mk IV. I used the .47" struts. I had to cut the rod shorter by about 1" and rethread the end fitting, probably because I didn't measure the length properly!
    https://www.mcmaster.com/catalog/130/1496/9416K12
     
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  12. nlappos added a post in a topic new rudder springs   

    The springs also tend to center the rudder in the absence of pilot foot forces. 
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  13. nlappos added a post in a topic CONTRIBUTIONS TO KEEP SITE GOING   

    Just sent some. Thanks for doing the heavy lfting
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  14. nlappos added a post in a topic Avid C Stol Rib Profile   

    Jim
    Maybe you could post the rib pattern scan in the Files and Forms section for posterity.
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  15. nlappos added a post in a topic Tubicles   

     
    These leading edge devices act like vortex generators, Interesting stuff! Here is more on them:
    https://aviation.stackexchange.com/questions/12842/how-turbercle-wings-could-generate-aerodynamic-advantage
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