Enclosing an Evans Volksplane VP-2

Discussion in 'Aircraft Design / Aerodynamics / New Technology' started by cluttonfred, Oct 26, 2014.

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  1. Sep 1, 2018 #101

    cluttonfred

    cluttonfred

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    Judging by the many VPs already flying, not to mention most dedicated agricultural aircraft ever built, it would seem that the effect of the struts on the aerodynamics may be overstated.

    1040474-large.jpg

    That said, and we are getting into "21st century Volksplane" territory here, if I were designing a modern homebuilt in the same spirit I would go with a thick airfoil and a cantilever wing, perhaps something like a simplified, two-seat Tipsy Junior.

    1598739-large.jpg
     
    Last edited: Sep 1, 2018
  2. Sep 1, 2018 #102

    TFF

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    Cessna and Piper were going to naturally use struts, and they are about twice as big as the high wing planes they stole the wings from. As for speed, crop dusters are not known for speed. New ones are fast compared to a Pawnee, but not fast. That's why they are great glider tugs, they don't have to fly fast to stay in the air.
     
  3. Sep 1, 2018 #103

    Tiger Tim

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    Chris Heintz beat you to it decades ago...
    [​IMG]
     
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  4. Sep 1, 2018 #104

    Sockmonkey

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    I've noticed that a lot of the older designs act like they have an allergy to thick surfaces, even though a fat teardrop is less draggy than a bunch of bracing wires.
     
  5. Sep 1, 2018 #105

    Wanttaja

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    Strut-Braced Fly Baby:
    [​IMG]

    Seems to do OK.

    Ron Wanttaja
     
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  6. Sep 1, 2018 #106

    Twodeaddogs

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    is it being stolen by a guy in a hoodie?
     
  7. Sep 2, 2018 #107

    Twodeaddogs

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    I'm an inspector on two Zenith 601s and a 701 and I have great respect for these aircraft but sometimes, I have to shake my head at some of the design decisions of the early model 601s, especially. Some of the features included sharp edges and angles that defy logic and the use of angle alloy instead of turnbuckles. The hinged canopy can be a right pain to deal with and a sliding canopy would have been much better. The undercarriage set-up was just daft. Later 601XLs are much better. they are good aircraft but would have benefitted from a bit more critical scrutiny early on.
     
  8. Sep 2, 2018 #108

    Twodeaddogs

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    well, if you could put together a VP lookalike, with considerably better climb rate, within a few hundred hours, with simple fasteners and tube technology, you'd be doing alright and it looks conventional enough to appeal to more people who might be put off by the other Dalby aircraft.
     
  9. Sep 2, 2018 #109

    Pops

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    The plans for my Zenith 600 shows aluminum angle instead of turnbuckles. Looks like someone just built to plans. Yes, the hinged canopy off the side is a pain. The Z-600 was also designed for 1835 cc VW engine.
     
  10. Sep 3, 2018 #110

    Twodeaddogs

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    In the UK, they changed out the aluminium angle for turnbuckles as a mandatory modification, which I agree with as setting the cable tensions is a pain. One of the two 601s I deal with has a belly hatch which makes access easier. The other has no hatch and access to the cables is awkward. Some of the skin thicknesses really need to be thicker, as the airframe can buckle like a coke can in places with little or no effort. I would also prefer a manual trim system, as the electric trim is very slow.
     
  11. May 17, 2019 #111

    blane.c

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  12. May 18, 2019 #112

    Turd Ferguson

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    There were several Fly Baby's with the Cub gear which necessitated a different wing bracing. Was there any particular Fly Baby builder that originated that mod which everyone followed or where they more or less carte blanche?
     
  13. May 18, 2019 #113

    Wanttaja

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    I'm personally only aware of one, the Argentine one whose picture I posted.

    Fly Baby biplanes often use Cub gear, but they solve the wing bracing problem another way.

    Ron Wanttaja
     
  14. May 18, 2019 #114

    Turd Ferguson

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    I knew someone that built a Fly Baby in the '80's that used off-the-shelf Cub landing gear and Stits 'Playboy' type wing struts. I may have a picture of it somewhere.
     
  15. May 18, 2019 #115

    Wanttaja

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    Thanks, TF. I'd be interested in seeing it.

    I did find a second picture of a strut-braced Fly Baby, but this one has spring-steel landing gear.
    [​IMG]
    In the plans, Pete does suggest an alternative landing gear design that eliminates the cross-axle and looks like a Cub gear:
    [​IMG]
    However, in this case, the cross-bracing is solidly welded and there are no bungees.

    Ron Wanttaja
     
    Last edited: May 18, 2019
  16. May 18, 2019 #116

    Riggerrob

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    ————————————————————————————-

    Yes!
    A friend flew his Zenith 601 more than 600 hours per year. Eventually the flat, aft fuselage skins wore out ..... forcing him to replace them.
    I suggested creasing the new skins .... like Murphy does.
    We have also heard Zenith 701 pilots complain that the fuselage is as loud as a giant trumpet horn .... noise caused by all the oil-canning and amplified by the cone shape.
     
  17. May 18, 2019 #117

    mcrae0104

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    Can you describe the problem more specifically? How does a fuselage skin wear out?
     
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  18. May 18, 2019 #118

    Tiger Tim

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    Is that what happens to them? I grew up in an area where there were a lot of active 601s and the shop where most of them were built had one wall covered in removed fuselage skins from the things. I guess that’s the side of cheap and easy airplanes that seldom gets discussed, the idea that they’ll more than likely have parts wear out faster both because of simplified construction and how often they’ll be flown.
     
  19. May 18, 2019 #119

    Turd Ferguson

    Turd Ferguson

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    Also interested in hearing the criteria for worn out aluminum skins
     
  20. May 18, 2019 #120

    cluttonfred

    cluttonfred

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    I seeing this thread pop up in "My Replies" and look forward to seeing new ideas about "Enclosing an Evans Volksplane VP-2" but.... :-/
     

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