Single Tube Fuselage idea

Discussion in 'Aircraft Design / Aerodynamics / New Technology' started by FritzW, Aug 11, 2016.

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  1. Oct 10, 2019 #301

    rotax618

    rotax618

    rotax618

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    They put the motor in the front ;)
     
  2. Oct 10, 2019 #302

    erkki67

    erkki67

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    5C00241D-3D5E-4726-A94F-A99F79796D6D.jpeg 8A39DB86-7828-4925-91F6-2DD66F0761B3.jpeg 7936E02A-9FB2-49F7-B189-95783B49958E.jpeg

    Rotax618
    Indeed they fly with the engine up,in front, but would you imagine a hefty 115kg 2m Pilot leaving the gravity of earth even just for 1m (3,2’)?

    The PeeWee has a few design features that pleases and others that don’t.

    What pleases is it light weight, dimensions, and construction.

    What I don’t like, biplane and the molehill killer unsuspended Landing gear.

    The fuselage seems to be built up out of a bent sheetmetal and riveted together.

    Either 6061 T6 or 6082 T6 could be found world wide.

    The tailvolume could be bent out of 6061 or 6060 tubing, the later .0125 bigger in diameter to add a bit more strength.

    Now, how to integrate the Ranger gear on this one, might be a bit challenging.

    The overheadstructure to hold the wings could either be riveted or welded steel.

    In fact, the tailvolume and the wings of the Euroflyulm Minifox would match this fuselage perfectly.

    99786BFE-B93E-4644-B91C-850309121F7C.jpeg
     
    Aerowerx likes this.
  3. Oct 10, 2019 #303

    rotax618

    rotax618

    rotax618

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    26C9D3FD-9198-41BD-B705-9E099F1BD42A.jpeg For a thin walled single fuselage tube you will need the equivalent of127mm(5”) tube for a taildragger and 100mm(4”) tube for a tricycle UC. 5”x 0.64” 6061t6 tubes are difficult to obtain in lengths greater than 12’ in most places unless you get a special run manufactured - all sizes are available from China but freight is expensive.
    A very lightweigh aircraft a smaller size may be possible. The lack of suitable fuse tubes ended the Boorabee construction here in Australia.
    A single tube certainly simplifies construction, the tube can be crushed at the ends and riveted to the rudder post at the rear and the pegs for rudder peddles at the front.
    I attach a plan for the main bulkhead of the Boorabee.
     
  4. Oct 15, 2019 #304

    erkki67

    erkki67

    erkki67

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    I’d still love le to go with the enhanced monotube structure, what would the minimal wall thickness be by using a 6060 alloy and 50mm outer diameter 2”
     
  5. Oct 15, 2019 #305

    erkki67

    erkki67

    erkki67

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    And what about 2” 6061 T6 or 6082 T6?

    .081 or .125?
     
  6. Oct 17, 2019 #306

    erkki67

    erkki67

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    I wonder what it cost to have a special size drawn?!
     
  7. Oct 17, 2019 #307

    erkki67

    erkki67

    erkki67

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    further Im looking for a sturdy ultralight wing construction, that is fast to assemble based on tubing, where off the nose tube do not equal the L/E.

    Further, the wing should be high lift and no highspeed Damon.
     
  8. Oct 17, 2019 #308
  9. Oct 17, 2019 #309

    blane.c

    blane.c

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  10. Oct 17, 2019 #310

    FritzW

    FritzW

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    Here's the start of the Erkki Monotube. Nose wheels are tools of the devil but with the tail this high I'm afraid it might need one. ...we'll blow up that bridge when we get here.

    Cub style rudder otta look good if the wings are the right shape.
    OTW1.jpg

    The gussets are .020, they would be easy enough with tin snips or CNC

    OTW Gusset1.jpg


    I'm trying to keep all the flanges small enough to be bent with a hand seamer/flanger
    image_12936.jpg

    Flat pattern could be just a PDF for the CNC impaired (flanged lightening holes are optional but would add a lot of stiffness, might just put flanges on the free edges)
    OTW Gusset1 a.jpg
    OTW Gusset1 b.jpg

    ...only a jillion gussets left to draw :(
     
    Last edited: Oct 17, 2019
    Victor Bravo and Hephaestus like this.
  11. Oct 17, 2019 #311

    Hot Wings

    Hot Wings

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    These work pretty well too. Often faster than the other kind.
    wiss-specialty-hand-tools-wf24-64_1000.jpg
     
  12. Oct 17, 2019 #312

    proppastie

    proppastie

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    long fishing pole tail skid, no wheel
     
  13. Oct 18, 2019 #313

    FritzW

    FritzW

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    We had one of those on the "free stuff" table at the hangar for a long time. I didn't know what it was so I didn't grab it, now I wish I had <face palm>
     
  14. Oct 18, 2019 #314

    plncraze

    plncraze

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    Rotax618, on your Boorabee did you ever consider going to a built up beam?
     
  15. Oct 18, 2019 #315

    FritzW

    FritzW

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  16. Oct 18, 2019 #316

    erkki67

    erkki67

    erkki67

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    Nose wheel, if it’s big enough, it could be one of the two variants

    D63DDB8D-C617-47A4-92BE-1E929450D4D8.jpeg
    for the tailwheel a diagonal tube to the motormount would be right
    70DB448A-9A4A-49BC-B9D4-701B1914FEAA.jpeg
     
  17. Oct 18, 2019 #317

    erkki67

    erkki67

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    Where and how would the upper and lower beam be joined
     
  18. Oct 18, 2019 #318

    addicted2climbing

    addicted2climbing

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    May as well buy a set of Demoichelle or Cubchelle plans to supplement this build. Also looks like the shock mount would be in the way of the pilots feet for rudder pedals. You could go the superstol route and move the shock to the upper member and have huge travel as a bonus.
     
  19. Oct 18, 2019 #319

    erkki67

    erkki67

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    F7B83172-6649-4ECC-A174-08369B7DA7EF.jpeg

    An a wing structure like this one.
     
  20. Oct 18, 2019 #320

    erkki67

    erkki67

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    E725292D-D3DD-4283-B900-C7CA724070F4.jpeg

    The idea, is to have the same shockabsorber position like on the Ranger, therefor the diagonal tubing is required to go from below the seat to the engine mount.
     

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