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. May 27, 2019 #761

    erkki67

    erkki67

    erkki67

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    Fritz, the container is still the size where the Ranger should fit.

    And the wing shall remain strutt braced, so no cantilever type.

    The wing section parts would be shorter and easier to work on, even in a small workshop, like the size of the shown container.

    And beside of giving more space to work on the single parts, it gives me a bit of play to store the Ranger not too tight in the container.

    A third benefit is there too, It leaves me an option to play with an alternative fuel one day.

    The idea to have a look at the SE33, I like that idea, I’ll see what Ill find out regarding that engine.
     
  2. May 27, 2019 #762

    erkki67

    erkki67

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    Regarding the engine SE33, no possibility to install a PSRU, only direct drive o_O

    The Helvenco 250 engine is an interesting engine, but as the engine comes from the Karting sector, it was built accordingly.

    The things I’d like to see differently, is the carburator position or orientation, 90 deg downward, and the water cooler also elsewhere.

    Even better would be if the engine would be standing upright, with a narrower noseprint.
     
  3. May 27, 2019 #763

    erkki67

    erkki67

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  4. May 27, 2019 #764

    Hot Wings

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    Haven't been following your thread in detail and missed this small fact. Makes your last IMHO statement much less of an O. :cool:
     
  5. May 27, 2019 #765

    Will Aldridge

    Will Aldridge

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    If I'm understanding HW correctly he's asking for a kitfox style folding wing: 20180831_163509.jpg

    Still strut braced and definitely not cantilevered and quite light. Advantages are structurally it only requires one pin inserted in the front spar to be ready to fly, as opposed to the current design that requires the wing to be supported while the struts are installed. The kitfox also needs the turtle deck installed but i doubt that would be an issue with your design. Main drawback i see in your plan to store in a shipping container is that it's a lot wider and more subject to hangar rash going into and out of the container. The kitfox with wings folded is 7.5' wide.
     
  6. May 27, 2019 #766

    Victor Bravo

    Victor Bravo

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    I would also like to suggest that while it is still being designed, and if it is possible without too much re-design or re-drawing, that the original version "bed mount" fuselage nose section (the flat spot the original Briggs engine would sit on top of), should be made large enough for a standard Rotax 503 bolt mounting pattern mounting plate. There are two fairly important reasons for this:

    1) There are literally tens of thousands of 503 engines out there, which are well-understood and well-loved by the UL and LSA community. The 503 is also regarded as a very reliable and easily maintained engine, as far as 2-strokes go. There are lots of people out there who have these engines mounted on a flying lawnchair style ultralight, with a reduction drive and a propeller already in hand. They might be interested in building a Ranger partly because it could use an engine they already own. And 503's are available at low cost on the used market.

    2) The final production version of Pete Plumb's Pegasus O-100 is being built with two integral mounting options, the "rear case" Continental style mount and a "bottom" bed mount Rotax style bolt pattern. The hand prop version of this engine with a magneto is about 100 pounds, and doesn't need a redrive. An electronic ignition can save a couple of pounds off of this weight too. The Continental style mounting ears can also be cut off to reduce the weight of the cranakcase by a couple more pounds if desired. I'm guessing that a fair number of potential Ranger builders will want to use this engine if they could, becauise a lot of exissting "airplane" people have access to used Continental parts that will allow them to minimize the engine cost for an O-100.
     
  7. May 27, 2019 #767

    Hot Wings

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    Poor word-smithing on my part .... again. :oops:

    I'm actually not a fan of the Kitfox style fold, even though I had cash in hand to buy one a while back. Just too much fiddling for me to consider it 'easy'.
    Fritz folding the wing from the front strut, using VB's rope hinge, looks to me like a reasonable option. Fortunately VB made the mistake of publishing his idea here so 'prior art' exists and he can no longer patent the idea. I plan to use it, royalty free, when needed.......
     
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  8. May 27, 2019 #768

    mcrae0104

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    Good to see you around here again, Will.
     
  9. May 27, 2019 #769

    Vigilant1

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    If you can live with 30-32HP, then direct drive may be a positive not a negative. Less weight (no PSRU, smaller prop), less cost, and less to go wrong (Torsional vibration, belts, bearings, etc)

    How much would we give up? Per Jan's calculator, given a 32 HP engine, what is the expected thrust at 60 MPH:
    48" direct drive prop at 3600 RPM: 121lbs
    70" prop with 1.98:1 PSRU (3600 engine RPM): 140 lbs (similar to the Valley Engineering Big Twin continuous HP, PSRU ratio, prop)

    The thrust difference might be larger at lower airspeeds.

    19 lbs of thrust ain't zero, but it comes at a price in weight, cost, and complexity.
     
  10. May 27, 2019 #770

    erkki67

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    I need short field performance!
     
  11. May 27, 2019 #771

    Vigilant1

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    I can't estimate TO distances, but we do know that the SD-1 folks claim that plane with this engine needs 260 m (858 ft) to take off and climb over a 15 meter obstacle. That plane has 6 m (19.7ft) wingspan and a max TO weight of 240 KG (533 lbs), so I'm sure the Ranger would probably get off the ground better.
     
  12. May 27, 2019 #772

    BBerson

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    Direct drive can handle more than a 48" prop. I have been testing 60", then cut it to 58" for more rpm.
    Does need to be thin composite tips.
     
  13. May 27, 2019 #773

    Victor Bravo

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    Used inexpensive Rotax 503 with reduction drive and large diameter prop will accomplish this at the lowest cost.
     
    Last edited: May 28, 2019
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  14. May 27, 2019 #774

    Vigilant1

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    Good point. I stopped increasing the dia at 48" because >at 60 MPH< there is very little improvement for going bigger. At lower airpspeeds, it's probably worth it to go longer if the engine can turn that prop up to max power RPM.
     
  15. May 27, 2019 #775

    FritzW

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    You can never have too much refructification...
     
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  16. May 27, 2019 #776

    erkki67

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  17. May 28, 2019 #777

    Victor Bravo

    Victor Bravo

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    All that college and the phone makes me spell like a Martian
     
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  18. May 28, 2019 #778

    pictsidhe

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    I thought the ranger is intended as a sorta-SSTOL plane?
    Big props will really help.
     
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  19. May 28, 2019 #779

    BBerson

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    The blade area needs to be proportional to power. So large diameter results in small chord blade tips.
    Toothpick props!
     
  20. May 28, 2019 #780

    erkki67

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