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Thread: Plankton v.2.0 - My latest design

  1. #1
    Pilot Dionysos's Avatar
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    Red face Plankton v.2.0 - My latest design

    Hi,
    I wanted to share my new lady with you guys.
    I was seeking a new challenge in terms of flying and building so after having flown various FPV aircraft, I came up with the following design criterias:

    1. A sporty flying long range plane ~ v(cruise) = 70-80 km/h
    2. Plenty of power: Min. 300W/kg for easy launches
    3. Front mounted motor: No propeller will do harm to my finger
    4. A collapsible platform for ease of transport: 3-piece wing detachable fuselage and vertical fin, however
    5. - No wiring mess or tons of connectors when it comes to removing the components
    6. Must fit in a wooden box (dissembled)
    6. A design that will last more than one season of flying and withstands wear & tear better than EPO
    7. A good range, say 80km total distance traveled, without the help of slopes/thermals
    8. A few cameras installed for flying pleasure without "looking through the propeller" aka lines in my picture
    9. An interesting design for the eye
    10. Min flight duration of 1hr
    11. Min 2.5kg payload



    Probably there were a few more things involved, but I think I nailed the most important ones. So I took my calculator, set up some .xls tables for CG estimations, weight estimations and designed a few platforms, analyzing the aerodramatics. Having in mind that the usage should be userfriendly and not stretching the limits too far, i.e. going crazy about reducing weight or optimizing for highest speed, I came to the conclusion that a tailless aircraft would suit those needs best.

    I had built my own 2 Zagi's, one was Mr Universe (because whatever you do, you cannot destroy this thing in the air, it can do more than 20g with ease) and the other one was a long-range zagi, collapsible, with vertical take-off capabilities. BUT: the swept wings are just not handy for transports in suitcases unless you really make like 5-pieces-wings, which really adds to the weight. Having said that, I wanted to give a plank a try. I haven't designed one of those yet, but I figured it may best suit my needs.


    Here are my chosen parameters:

    Wingspan: 1.98m, composed out of 3 segments
    Wing area: ~0.8m2
    Airfoil: modern reflex airfoil, cm(0)>0, 10% thickness
    static margin: 10%
    max cl: @ ~30% of wingspan for "friendly" stalling behavior
    v(landing): ~40km/h
    v(cruise): 70-80km/h
    v(max): 160km/h
    Glide ratio: (includes fuselage and interference drag): ~ 14 (1km height, 14km distance in glide)
    Weight with all gear: 3800gramms, 4500gramms with 3 batteries
    Propulsion: Brushless with 2x5S 5000mAh, with the option to increase to 20000mAh -25000mAh
    Input Power: 1.6kW

    CG location: 60-70mm from the leading edge
    Motor thrust line: -1.5 to -3 degrees. Thrust line should be aligned with chord of wing.


    Now, I'm tired of writing. I'll let you know more soon

    I hope you enjoy,

    Dio

    Demo Video:
    Last edited by Dionysos; 4th June 2013 at 01:58 AM. Reason: edited CG and thrust line
    Latest Crafts: The Anti-Gravity-Machine, Carbonator, Guava 2m, Wunderwaffe I, Wunderwaffe II, Uberwaffe, Plankton v2, TBS discovery

  2. #2
    Pilot Dionysos's Avatar
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    Hi,
    so here some pictures of the CAD design, all parts mounted together. If somebody wonders about the name Plankton, well, it's a flying plank. Ande because I have this addiction for green planes, the algee plankton is green, too. Now it doesn't take a PHD to figure out the similarities. I couldn't find anyone ever that named a plane plankton, so I hope I'm the first.

    Btw, this is the second version already. You will understand this one better at a later point in time.

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    The choice of materials:

    Plankton v.1.0 (first Prototype):
    High density foam for the wing (30kg/m3)
    3 layers 80gsm glass fiber center wing
    2 layers 80gsm wing tips

    Fuselage:
    Foam, 30kg/m3, manually cut top and side view, the rounds were sanded and the whole thing was coated 80gsm glassfiber, 2 layers in front, 1 layer at the rear fuselage.

    Equipment:
    Hyperion ZS 3025, 775kV
    2x 4s 4500mAh, nanotech
    Plush 80amps ESC

    2.4ghz tx 500mW from BEVRC

    Servos:
    2x Turnigy wing servos, 8kgcm

    ET OSD with barometric altitude (quite nice, resolution in m is worse than feet, oh well), guardian


    Plankton v.2.0 (current):
    High density foam for the wing (30kg/m3), CNC-cut
    5x1mm carbon spar over the whole wing, top and bottom

    1 layer glass fiber 50gsm for the tips
    1 layer glassfiber 80gsm for the center wing
    2 layers 200gsm, to join the wings in the center (very narrow, not as much weight as it sounds)

    Fuselage:
    molded glassfiber fuselage with appropriate re-inforcements in the motor region

    Equipment:
    Hyperion ZS 4020, 550kV, 16x8 Carbon Fiber folding, Aeronaut
    2x 5s 5000mAh, nanotech
    K-force 100amps, motor will draw ~90Amps current

    2.4ghz tx 500mW from BEVRC

    Servos:
    2x Turnigy wing servos, 8kgcm

    Rangevideo OSD

    TBS69 CAM
    Last edited by Dionysos; 10th February 2013 at 07:56 AM.
    Latest Crafts: The Anti-Gravity-Machine, Carbonator, Guava 2m, Wunderwaffe I, Wunderwaffe II, Uberwaffe, Plankton v2, TBS discovery

  3. #3
    Pilot Dionysos's Avatar
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    Plankton v.1.0 (Prototype)




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    Last edited by Dionysos; 2nd October 2012 at 12:00 PM.
    Latest Crafts: The Anti-Gravity-Machine, Carbonator, Guava 2m, Wunderwaffe I, Wunderwaffe II, Uberwaffe, Plankton v2, TBS discovery

  4. #4
    Pilot Dionysos's Avatar
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    Plankton v.2.0 (current version)

    Time to bash my development a little.The first version has a major cut-out in the wing to store all the electronics and RcRx. It works nicely, especially if you need to set up the plane, but from a strength point of view, I just couldn't live with it. I had to put some reinforcement there. The fuselage could host 2x 4S 4500mAh but that was about it. The coating of the wing with glass fiber, it was ulta-strong, but it was not necessary, lastly the weight of the prototype jumped to 3800gramms. It's still ok, but it's just not good enough anymore. If you look carefully, the motor thrust line is below the wing, so you need a significant down thrust. I was wondering if I could reduce weight, increase power by 30%, achieve better slow flying behavior and cater for more batteries. Well, it was about time to solve some riddles and improve the concept that's how the second version got developed.

    Click image for larger version. 

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    Here are some pics in chronological order. Especially the mold-making part took me quite a few weeks. Everything has to be precise, the master has to have a good, shiny surface. I also needed to try several release agents, sounds easy, but here in Asia they sell you all kinds of crap, hence I made 32 specimen with different release agents, finally, I found one that did the job.

    Enjoy!

    Dio
    Last edited by Dionysos; 15th October 2012 at 01:10 PM.
    Latest Crafts: The Anti-Gravity-Machine, Carbonator, Guava 2m, Wunderwaffe I, Wunderwaffe II, Uberwaffe, Plankton v2, TBS discovery

  5. #5
    Pilot Dionysos's Avatar
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    Hi again,

    here the last pics (so far) of the 2nd plane. The molds are still fresh after un-molding and require cleaning.
    .
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    IMPORTANT: The RcRx's position is not recommended. Relocate to other wing.
    Last edited by Dionysos; 10th March 2013 at 11:25 AM.
    Latest Crafts: The Anti-Gravity-Machine, Carbonator, Guava 2m, Wunderwaffe I, Wunderwaffe II, Uberwaffe, Plankton v2, TBS discovery

  6. #6
    His Royal Sassiness ssassen's Avatar
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    Sounds interesting, got a rough sketch already?
    Purveyor of the FPV secret sauce at ImmersionRC

  7. #7
    Pilot Dionysos's Avatar
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    Yep,
    already 2 planes flying

    ...but step by step. I need to get a few drawings from my other computer. So much I can say: It has similarities with the Alulah, but I believe I could tweak a few things here that really make life worthwhile.

    Dio
    Latest Crafts: The Anti-Gravity-Machine, Carbonator, Guava 2m, Wunderwaffe I, Wunderwaffe II, Uberwaffe, Plankton v2, TBS discovery

  8. #8
    Pilot Dionysos's Avatar
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    updated post 2
    Latest Crafts: The Anti-Gravity-Machine, Carbonator, Guava 2m, Wunderwaffe I, Wunderwaffe II, Uberwaffe, Plankton v2, TBS discovery

  9. #9
    Pilot
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    Nice Ideas Dionysos!

    I have the SuperAlulah that your talking about, but its grounded,
    I keep cracking the fiberglass fuselage on landing....The wings are great and
    covered with Fiberglass, I just wished the Fuselage was made out of tough/dense
    foam for cases like mine (no grassy fields to land on). The wings are made out of foam
    and covered with Fiberglass and it will not break (its tough as heck, and abused).

    I look fwd to your build. Are the wings going to be detachable for transport?

    So far, great ideas!

  10. #10
    Pilot Dionysos's Avatar
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    Hi,
    it's a 3-piece wing, each section being 0.66m ~ 26''. The fuselage is made out of glass fiber, molded, you can remove it with ease. The front area is re-inforced to cater for the heavy battery. Pics will follow. Also the vertical fin can be removed. It's totally transport friendly. Right now I'm building my box to bring it to Europe for my annual holiday.

    The Alulah is a nice plane, especially it's very light. But for my purpose (to pack the plane in a "real plane") I can't carry it around. But if you cannot land on grass, why not put some protection there? Sanding paper?
    Where does your fuse crack? Maybe just throw in a CF or AF roving to reinforce it?

    Dio
    Latest Crafts: The Anti-Gravity-Machine, Carbonator, Guava 2m, Wunderwaffe I, Wunderwaffe II, Uberwaffe, Plankton v2, TBS discovery

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