Ragwing Rw2 ultralight? can it be done?

Discussion in 'The light stuff area' started by Holtzy3, Jul 11, 2012.

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  1. Jul 11, 2012 #1

    Holtzy3

    Holtzy3

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    ive heard someone made the ragwing rw2 a legal ultralight, is that even possible?
     
  2. Jul 11, 2012 #2

    lurker

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    per specs, no. too heavy, stall speed too high, cruise too high
    [TABLE]

    [TD="width: 121"][FONT=Arial, Helvetica, sans-serif]Wingspan[/FONT][/TD]
    [TD="width: 115"][FONT=Arial, Helvetica, sans-serif]18 ft [/FONT][/TD]

    [TD="width: 114"][FONT=Arial, Helvetica, sans-serif]VNE[/FONT][/TD]
    [TD="width: 118"][FONT=Arial, Helvetica, sans-serif]125 mph[/FONT][/TD]

    [FONT=Arial, Helvetica, sans-serif]Wingarea[/FONT]
    [FONT=Arial, Helvetica, sans-serif]120 sq.ft. [/FONT]

    [FONT=Arial, Helvetica, sans-serif]Cruise speed[/FONT]
    [FONT=Arial, Helvetica, sans-serif]70 mph [/FONT]

    [FONT=Arial, Helvetica, sans-serif]Length[/FONT]
    [FONT=Arial, Helvetica, sans-serif]14.7 ft [/FONT]

    [FONT=Arial, Helvetica, sans-serif]Stall speed[/FONT]
    [FONT=Arial, Helvetica, sans-serif]30 mph[/FONT]

    [FONT=Arial, Helvetica, sans-serif]Height[/FONT]
    [FONT=Arial, Helvetica, sans-serif]5.5 ft [/FONT]

    [FONT=Arial, Helvetica, sans-serif]Climb rate[/FONT]
    [FONT=Arial, Helvetica, sans-serif]750 fpm [/FONT]

    [FONT=Arial, Helvetica, sans-serif]Seats[/FONT]
    [FONT=Arial, Helvetica, sans-serif]1 [/FONT]

    [FONT=Arial, Helvetica, sans-serif]Range[/FONT]
    [FONT=Arial, Helvetica, sans-serif]125 s.m. [/FONT]

    [FONT=Arial, Helvetica, sans-serif]Empty weight[/FONT]
    [FONT=Arial, Helvetica, sans-serif]278 lb [/FONT]

    [FONT=Arial, Helvetica, sans-serif]Take off run[/FONT]
    [FONT=Arial, Helvetica, sans-serif]100 ft [/FONT]

    [FONT=Arial, Helvetica, sans-serif]Gross weight[/FONT]
    [FONT=Arial, Helvetica, sans-serif]550 lb [/FONT]

    [FONT=Arial, Helvetica, sans-serif]Landing roll[/FONT]
    [FONT=Arial, Helvetica, sans-serif]200 ft [/FONT]
    [/TABLE]
     
  3. Jul 11, 2012 #3

    Holtzy3

    Holtzy3

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    the guys said he put a lighter weaker engine in it to meet weight, and put a throttle block so it couldn't exceed the 68mph
     
  4. Jul 11, 2012 #4

    Topaz

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    A throttle block will also severely limit your climbing ability. Climb is where you need full throttle the most.
     
  5. Jul 11, 2012 #5

    Holtzy3

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    true, i dont know if building one of them 25 lbs lighter is very safe also
     
  6. Jul 12, 2012 #6

    TFF

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    It needs power because the drag on a biplane is high, in general. Half power in many biplanes means you are descending. Ultralites are minimalist because they cant give up anything; they dont have it to give. Given how long it takes to build something like that, it might be a good match on having something you really want, once your done.
     
  7. Jul 13, 2012 #7

    PaulS

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    You will have to subtract 25 pounds from the weight while adding either more wing or flaps to lower the power-off stall speed to 27 mph and find a way to limit your top horizontal flight speed to 64 mph and still be able to fly. Off the top of my head I would say you might as well start with a new design.
     
  8. Jul 13, 2012 #8

    lurker

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    i think there are a couple of other airplanes on ragwing's site which will meet far103
     
  9. Jul 13, 2012 #9

    Sir Joab

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    Airdrome Airplanes' Dream Classic has a wing area of 122 square feet and empty weight of 241 pounds with a stall speed of 26 mph; Leonard Milholand's Legal Eagle has a wing area of 107 square feet and an empty weight of 244 pounds with a stall speed of 25 mph.

    Perhaps a thicker airfoil would give you the necessary stall and maximum speeds? Still have to lose the 25 pounds though.
     
  10. Jun 9, 2015 #10

    azsportpilot

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    weight limit of 254 lbs goes up 24 lbs with a BRS, but the Softpack 600 only weighs 18 lbs.... so there's 6 lbs gained with the chute

    Rotax pull start 447 would get the weight down further

    climp prop to reduce cruise speed and compensate for HP reduction

    VG's (Vortex Generators) on all 4 wings to reduce stall speed

    no brakes, no gauges, no paint and no seat and you should be close
     
  11. Jun 10, 2015 #11

    PTAirco

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  12. Jun 10, 2015 #12

    azsportpilot

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  13. Jun 10, 2015 #13

    WBNH

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    Wing area on the Legal EagleXL is 120 sq. ft.

    The Airbike used almost the same 120 wing and had a hard time making 254 with a two stroke.

    Roger Mann's site bills the RW2 as Ultralight (http://rogermann.org/ragwing/designs/rw2/) but he's either generously using the word just to mean that it is a very light aircraft, or he's applying Canadian ultralight regs, because it's not FAR Part 103 being applied.
     
    Last edited: Jun 10, 2015

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