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. Jul 8, 2019 #861

    FritzW

    FritzW

    FritzW

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    Since I've been spending so much time ranting on the APlane thread I thought I'd better post an update on the Ranger.

    I'm not proud of it but I decided to go with store bought AS&S Spruce for the longerons, spar caps and geodesic. I wanted to use lumber yard Pine and Doug Fir but I got lazy.
    Ranger stock.jpg
    That should be enough Spruce for two or three Rangers. Also the wing trailing edges and the rudder tube.

    Since there's really not enough room in my garage to build two airplanes (and the Neirrh was there first) I'm going to do the actual building out at the chapter hangar, I'm there every day anyway.. We're cleaning up from our Waiex build but that should be done this week, then I can move this stuff out there and actually start building ...and have enough room to have a reasonable chance of success.
     
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  2. Jul 8, 2019 #862

    Hot Wings

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    I'm happy to see that I'm not the only one that has a pile of swarf on my mini lathe/mill. :cool:
     
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  3. Jul 15, 2019 #863

    erkki67

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    Do you have any pictures of any of the parts produced yet?
     
  4. Jul 15, 2019 #864

    FritzW

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    This is most of it. It's all going out to the hangar this week. I don't have enough room in my garage to build it so we made room in the build area of the EAA hangar (the Neirrh has priority in the garage). There's good and bad with a group/chapter build but that's my best option right now.

    EDIT: I'll start a build log when I start gluing things together.

    20190715_144016_resized.jpg
     
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  5. Jul 29, 2019 #865

    erkki67

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    The Ranger and AP reviewd, both with the same idea, the Ranger as a wooden construction and the AP as a pure aluminium buildup.
     
  6. Jul 29, 2019 #866

    FritzW

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    An AP made with a Kirk PeeWee "keel style" construction?

    Kirk Pee Wee EC4.jpg
    ...just the keel idea, not the formers
     
    Last edited: Jul 29, 2019
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  7. Aug 4, 2019 #867

    erkki67

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    Is the Ranger thinkable with an overheadstructure like the RW1 or RW6 of Ragwing Aircraft?
     
    Last edited: Aug 4, 2019
  8. Aug 4, 2019 #868

    FritzW

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    Sure. Just end the pylon at the top longerons and add some cabanes (and the cables etc. to make it rigid). The cabanes would have to be pretty long and might look a little goofy.
     
  9. Aug 4, 2019 #869

    erkki67

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    So you think it might look odd?
     
  10. Aug 5, 2019 #870

    erkki67

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    How would it look like with keel?
     
  11. Aug 6, 2019 #871

    erkki67

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    D7A55760-F625-4A06-8479-DC69D4C44FF3.jpeg

    But this was a great idea, it’s just crazy what a 40HP can cost.
     
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  12. Aug 6, 2019 #872

    erkki67

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  13. Aug 6, 2019 #873

    litespeed

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    Did You mean the two stroke or the V twin?

    Any idea on cost and actual weight minus the box?
     
  14. Aug 6, 2019 #874

    Vigilant1

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    Would you be trying to run it direct drive, or with a PSRU? Kevin used an Ace redrive to run his previous B&S 627cc hopped-up engine at high RPMs.

    Either direct-drive or with a PSRU, a 670cc air-cooled normally aspirated 4-stroke engine can be expected to give about 23 continuous HP in aircraft use. If we need more than that, then more displacement is needed, pure and simple.
     
  15. Aug 6, 2019 #875

    erkki67

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    For the 650cc GK is claiming 53hp.which should be plenty of ponies.

    The weight given is for the gearbox, CVT and engine is 72kg ( 159lbs)

    Pricing is to be checked directly with GK.
     
  16. Aug 6, 2019 #876

    Vigilant1

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    Yes, but how much power do you need for cruise flight? That engine won't make nearly 53hp continuously, at least not if we want it to to be a reliable engine for flight.
     
  17. Aug 6, 2019 #877

    apmartin00

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    The Zombug is powered by a vw derived radial 1600cc by Bespoke Engineering. No real info on it, Might just give them a call and ask how light they think they can get the engine for an "offroad" project.
     
  18. Aug 6, 2019 #878

    FritzW

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    That sounds awfully optimistic, even for short periods.

    160lbs is too much for the Ranger.
    The Hummel 1/2 VW (that I'm pretty much committed to) makes ~37hp at less than 100 lbs (45kg).
     
  19. Aug 6, 2019 #879

    erkki67

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    The engine weight is a composition of 3 different El elements.
    The engine
    The continuous variable transmission
    The gearbox.

    The engine itself is most probably in the lower 100lbs range.
     
  20. Aug 6, 2019 #880

    Vigilant1

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    Microsport says their SE33 carbureted, direct-drive adaptation of the B&S 810cc engine weighs 77 lbs (32 kg) and produces 33 HP. I'd be highly skeptical that the 33 HP can be produced continuously, but 27 HP continuous would be consistent with other engines of this type and size. These are flying today, so the path has been found (suitable carburetor, prop adapter, ignition, modifications for horizontal mounting and lubrication, etc). New B&S 810cc engines are less that $1000 in the US, and I believe they have dealer support in most other regions of the world.
    For continuous HP, all these air-cooled engines NA 4-strokes will will ultimately be limited by CHTs/cooling. If will an 810cc industrial engine (designed to run all day at 27 HP) can't produce the continuous power you need, it is unlikely that an air-cooled, 4-stroke 650cc engine designed for carts/UTVs will be able to do it.
    Lycoming, Continental, VW, Jabiru, etc: If it is a 4-stroke NA engine in an airplane and the head is directly air cooled, it takes 30-33cc per continuous HP. No induction magic, higher RPMs, rods, high CRs, groovy aftermarket rods or cams, etc have allowed airplanes to exceed that long-term.
     
    Last edited: Aug 6, 2019

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