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Thread: Robin Ultralight

  1. #41

    Join Date
    Jul 2011
    Location
    Northwood ,N.H. USA
    Posts
    102
    Mark I sit here and wish I could help. Mostly I can not see the need. I can not see the situation that would befall a pilot of an U/L that would require that restraint . I must assume the pilot has his feet on the pedals and has some self restraint in that direction. If the nose of the plane comes off then you will lose so much weight you would be falling tail first on your balistic chute I would hope.
    Last edited by Norman Langlois; 04-07-2012 at 05:32 PM.

  2. #42

    Join Date
    Oct 2011
    Location
    Midlothian Texas
    Posts
    62
    Norm, I have to design for a standard condition. 12 g fwd crash load. In this case the pilot will submarine under the standard seat belts.

  3. #43

    Join Date
    Oct 2011
    Location
    Midlothian Texas
    Posts
    62
    Just updated the Blog to show the progress from the Easter Holiday. http://robinultralight.blogspot.com/

    I decided to bite the bullet and buy a second shoulder harness from Aircraft Spruce. I will cut down the shoulder harness and make my two crotch straps.

    Mark

  4. #44

    Join Date
    Oct 2011
    Location
    Midlothian Texas
    Posts
    62
    I just updated my Blog again http://robinultralight.blogspot.com/ I am almost finished with all of the covering. I also added a series of photos that shows how I went from a 2d paper drawing to a fully molded 3d blister for the rudder cable fair lead

    Attachment 17105Attachment 17106 I went from this to this in 1 hour


    Mark

  5. #45

    Join Date
    Oct 2011
    Location
    Midlothian Texas
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    62
    I finally started and ran up the engine!!! Smooth!!, this is the smoothest single cylinder engine I have ever seen. I posted a video on the Blog http://robinultralight.blogspot.com/

    and another link on the blog to an earlier entry on the theory I used for the engine vibration mounting. Taxi testing could start next week end!!!

  6. #46

    Join Date
    Oct 2011
    Location
    Midlothian Texas
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    62



    Here is a link to the initial run up and a later run with the cowling. The cowl is getting too hot after the run ups, so I have ordered some insulation and header wrap. I have to wait until I receive it before I continue the run in procedure. The engine cools better with the cowling on than off

  7. #47

    Join Date
    Oct 2011
    Location
    Midlothian Texas
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    62
    I updated the blog http://robinultralight.blogspot.com/ to show the thermal blankets and header wrap. I plan on breaking in the engine for 4 hours this week end. I bet my neighbors will be thrilled with me by Sunday!!!!

  8. #48

    Join Date
    Oct 2011
    Location
    Midlothian Texas
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    62
    I just updated the Blog http://robinultralight.blogspot.com/ . I outlined some heating problems I am having and a serious problem with fiberglass fuel tank deterioration due to the ethanol in the fuel. I have a solution for the fuel tank, I am making a new tank and coating it with an automotive epoxy designed to specifically protect against ethanol in the fuel. This is pretty serious, the tank is turing into rubber. I never had this problem 25 years ago with fiberglass tanks on the Wren.

  9. #49
    rosiejerryrosie's Avatar
    Join Date
    Jul 2011
    Location
    Carlisle, PA
    Posts
    392
    Folks have been warning about this for years now. I had a friend lose an entire tank of fuel on to his hangar floor when the ethanol ate throught the tank. Another was forced to make an off field landing when the particles from the inside of his tank, created by the action of the ethanol on the fiberglass, clogged his fuel filter. NOT good stuff! Check your fuel lines also to make sure they are not facing the same fate as your fuel tank. There are some folks who strongly advise against using ethanol contaminated fuel in 2 stroke engines - they say that the alcohol has a 'cleaning' affect which robs cylendar walls and other moving parts of lubrication normally provided by the fuel/oil mixture.....
    Cheers,
    Jerry

    NC22375
    65LA out of 07N Pennsylvania

  10. #50

    Join Date
    Oct 2011
    Location
    Midlothian Texas
    Posts
    62
    Finally updated my Blog, I took a long road trip two weekends ago to buy a new trailer so I can haul my baby to the airshows.

    http://robinultralight.blogspot.com/

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