The Ranger, an easily built high wing LSA runabout

Discussion in 'Aircraft Design / Aerodynamics / New Technology' started by Victor Bravo, Feb 19, 2019.

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  1. Apr 27, 2019 #601

    akwrencher

    akwrencher

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    Would it be possible to just run a slightly longer stub exhaust from the top cylinder bent and over to one side? I don't know if that would get it far enough from the pilots fresh air supply or not, but it would be simple......



    My OCD wouldn't let me do that either.....although it might be possible to mount it like a Y.....
     
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  2. Apr 27, 2019 #602

    Dillpickle

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    [QUOTE="FritzW,
    My OCD won't let me run 2 cyl's down one side and 1 down the other...[/QUOTE]

    I FEEL YOU!!!!!!! I literally chortled. Would splitting the top tube into two tubes and running those down each side work for you visually? A full collector ring would enter PITA world.
     
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  3. Apr 27, 2019 #603

    erkki67

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    11DD2268-B963-458C-A082-9EAF088B780B.jpeg

    How to integrate the exhaust on a Verner and Ranger.
     
  4. Apr 27, 2019 #604

    Victor Bravo

    Victor Bravo

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    Well that just leaves me with a big question mark...
     
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  5. Apr 27, 2019 #605

    cluttonfred

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    From a model aircraft engine, but it's an elegant design.

    [​IMG]
     
  6. Apr 27, 2019 #606

    pictsidhe

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    Looks like the engine must be mounted Y! Maybe Scott can tell us about any flaws to that idea?
     
  7. Apr 27, 2019 #607

    erkki67

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    Exactly what we need here.
     
  8. Apr 28, 2019 #608

    Blackhawk

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    Last edited: Apr 29, 2019
  9. Apr 29, 2019 #609

    daveklingler

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    A quick google search a while back found a bunch of people offering teflon bearings that were actually designed to be bearings, a few dollars apiece, with lots of engineering numbers including wear time at various continuous loads.

    I concluded that was a pretty good way to go the next time I needed a few. They're more expensive than a stick of PVC or PEX, but not that much more, and I'll only need a few.
     
  10. Apr 29, 2019 #610

    pictsidhe

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    I have used plastic Igus bearings. But they are only cheap if you buy a lot in the same size.
     
  11. Apr 29, 2019 #611

    Victor Bravo

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    I must say I don't like the idea of the Kung Pao Rotax in Post #608. The whole concept pf the Ranger was intended to include an equally fundamental focus on low operating cost without sacrificing high reliability, which is why the industrial V-twin was the first choice.

    The V-twin engines are well known to run very reliably over a long period, slow piston speeds, low internal running stresses, less heat, lower RPM, less noise, etc. etc.

    A $2,000.00 base engine, with a couple of hundred dollars in very simple HBA parts for the belt redrive, seems like the sweet spot to me. Rebuilding a less expensive used V-twin into an aircraft engine (bringing it up to 45-48HP in the process) would save a little more money too.
     
  12. Apr 29, 2019 #612

    Blackhawk

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  13. Apr 29, 2019 #613

    cluttonfred

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    I think the Ranger power options are similar to what I was discussing for the Fokker V.40 parasol pastiche in another thread. There is a sweet spot for four-stroke engines in the 35-45 hp range that gives you a range of options at increasing cost from the budget industrial V-twins with redrives to mid-range half VWs and finally the top-of-the-line Verner 3VW radial.
     
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  14. Apr 29, 2019 #614

    Victor Bravo

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    I believe it is absolutely correct to say that the mission and intent of the Ranger, from the start, was to be a near-minimalist, very inexpensive, very user-friendly, little off-road dirt bike for a pilot who already has developed the basic flying skills.
     
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  15. Apr 30, 2019 #615

    erkki67

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    The ring will do the affair.

    Regarding the aft fuselage structure, is it geodetic from a routed plywood panel, or is it made from glued together sticks?
     
  16. Apr 30, 2019 #616

    ScaleBirdsScott

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    Verner has said the Y is not a supported config. Mainly because of the case oil drain being unable to, well, drain. It may well be that, with some modification at the factory or by the user, such a setup is possible, but I can't say if there's an allowance in the material to go adding more drain fittings there. The heads should be fine with it.
     
  17. May 1, 2019 #617

    rtfm

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    Hi erkki,
    From the look of it, they're sticks.
     
  18. May 1, 2019 #618

    erkki67

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    Fritz, is the aft tail cone structure a routed milled one or stick built up?
     
  19. May 1, 2019 #619

    erkki67

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    A398D31A-A541-4100-A6AD-88C5A217E35B.png
    As according to this pic it looks routed?!
     
  20. May 1, 2019 #620

    FritzW

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    It's built out of sticks. The picture looks like routed lattice because it was easier to draw.
     

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