Big Lift (oz4923)


Big Lift (oz4923) 1974 - plan thumbnail

About this Plan

Big Lift. Radio control model. Large model for glider towing. Discontinued kit from Multiplex.

Quote: "The Multiplex Big Lift is a hard-working 'workhorse' aeroplane which has earned immense popularity throughout the world because of its versatility, its robust structure, and its good-natured handling. Big Lift makes the perfect trainer, an ideal glider tug, a capacious parachute dropping platform, and is also hard to beat as a pleasant mannered powered model for a gentle Sunday afternoon."

Quote: "Notes: The print size of the sheet files is 102 x 72 cm. / 40.158 x 28,348 inch. The print size of the manual and 'ribs outer wing' file is A4 / 29.7 x 21 cm. / 8,263 x 11,68 inch. The building manual tells to build the outer wing parts separately and glue them to the root wing parts. Of course it's more wise to build each wing as one part with spars running from root to tip. The 5 mm. bottom plate of the fuselage is very thick... 3 mm. is enough. The Big Lift flies fine with a .60 / 10 cc two-stroke or a .80 / 13 cc fourstroke engine, at a weight of 6 kg. When the Big Lift will be used for towing gliders, a bigger engine should be mounted. Suggested throws: elevator = 25 mm or 18°. Rudder = 30mm or 20°. + 40% exponential."

Direct submission to Outerzone.

Update 19/10/2013: Added supplement plan sheet for Huckepack glider tow mount/release.

Supplementary file notes

Additional plan sheet for Huckepack glider tow mount/release.
Manual, build instructions in German, English and French. Parts list. Also includes detailed drawings and description showing aileron/flap mod.


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Big Lift (oz4923) 1974 - model pic

  • (oz4923)
    Big Lift
    from Multiplex
    88in span
    IC R/C Cabin Kit
    clean :)
    all formers complete :)
  • Submitted: 12/10/2013
    Filesize: 1104KB
    Format: • PDFbitmap
    Credit*: Pilgrim
    Downloads: 19330

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User comments

Hi Steve and Mary. Send you a picture of my Big Lift of Multiplex [pic 007]. Added a little modification in vertical stab and add Fowler flaps for more slow landings. I hope like this. Greetings from Colombia.
CarlosB - 10/12/2020
Hello, Enclosed is a picture of the Multiplex Biglift [main pic]. OS 90 old engine, wooden struts, Solartex cover with dope markings. 4850 grams ready to fly weight. Best regards,
Reza Abdolahi - 24/02/2021
Dear Steve & Mary,
I recently flew my brand new Big Lift for the first time. A big but very rewarding project, it flies great! I built it over the course of last year using the oz plan. The wings are built completely as per plan. I dit not want to use balsa to build the fuselage, so I redesigned it completely to be able to use light ply. All the parts were cut using a low budget diode lasercutter. As I did not have a cowling for the motor, I made it part of the fuselage. The brushless motor easily fits through the air inlet. I was afraid that the plane would be heavy, so I tried to eliminate every gram of excess weight and ended up with a very light flying weight of 4.1kg.
SURPASS C5065 335kv motor - 18x10 prop - 70A ESC - 6s 6000mah 50c lipo
Many thanks for Outerzone!
Peter Ingels - 02/02/2024
And yes ... I forgot to attach the pictures ... here you go [pics 008-011]
Peter Ingels - 02/02/2024
Hallo hier einige Bilder von meinem Eigenbau Big Lift [pics 012-017]! Spannweite 2300 mm Abfluggewicht 5 Kilo Motor DLE 30 ccm Motorhaube 3 D Druck.
Werner Forster - 16/02/2024
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