Loening NA-3 (oz5400)


Loening NA-3 (oz5400) by Walt Musciano 1948 - plan thumbnail

About this Plan

Loening NA-3 Amphibian. Control line scale model.

Quote: "EVERYONE is familiar with Admiral Richard E. Byrd's North Pole expedition on which he used the Fokker trimotor Josephine Ford; however few are aware that without the data accumulated on his previous North Greenland expedition in 1925 this flight would have been impossible. The hazardous flights over the 'Greenland Ice Cap' (the world's iceberg factory) required rugged utility aircraft capable of land and sea operation and strong enough to withstand the terrific winds often encountered at this point. The US Navy had no air-plane that could meet these requirements, but the Army had. Consequently three Loening amphibians were acquired for use on this expedition and were designated NA-1, NA-2 and NA-3.

Although the plans indicate a Mite diesel engine, the model can be flown with electric spark ignition engines from .099 to .199 cu. in. displacement using Liquid Dynamite to 'dieselize' them. A dieselized Arden was successfully used for quite some time. The elimination of coil, condenser and batteries allows more weight to be put into the ship's structure for added strength, but the weight factor should still be kept in mind as the model is being built. Try to keep the weight under 10 oz.

Full size bulkheads, formers and ribs are shown on the plans and the rest of the drawing is one-half model size. The fuselage is constructed entirely of sheet balsa to insure its simplicity, strength and waterproof qualities. First the two fuselage sides are cut from 1/16 sheet hard balsa and sanded smooth on both sides to about 1/20 thickness.

The hardwood engine mounts are cemented to these sides and allowed to dry, during which time the fuselage bulkheads and formers are cut to shape. These are cemented in their proper location using plenty of cement. Cut the stabilizer and elevator from 1/8 soft balsa and the fin from 3/16 soft balsa. After the control rod has been attached to the elevator, the horizonal tail assembly can be mounted on the fin and securely cemented. The turtledeck is now attached to the fuselage and the rudder added.

Attach the bellcrank assembly as shown in sketch. It is advisable to construct and attach the lower wing at this time. The construction is very simple; remember to leave the leading and trailing edge stubs as shown on the plan. Cut away the fuselage sides to admit the wing stubs and, when the proper dihedral is set, plenty of cement can be applied through the open fuselage bottom gluing the forward stubs to the plywood bulkhead.

The author's model had a retractable landing gear in spite of the fact that takeoffs as well as landings can be made without the gear, when flying over grass. Many amphibian models feature landing gears that are flimsy in the 'down' position and tear off or collapse on the first rough landing. If a portion of the radiator grill is made as a hatch, by using a magnetic screw driver the retaining bolt (steel) can be removed and the coil spring will hold the gear in the 'up' position. This assembly should be mounted on the plywood float bulkhead and the bulkhead attached to the fuselage to be followed by the float keel and remaining balsa bulkheads..."

Hi Steve - Here is Walter A. Musciano's Loening Amphibian from Model Airplane News magazine issue 05-48.

Direct submission to Outerzone.

Supplementary file notes

Article pages.


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Loening NA-3 (oz5400) by Walt Musciano 1948 - model pic

  • (oz5400)
    Loening NA-3
    by Walt Musciano
    from Model Airplane News
    May 1948 
    22in span
    Scale IC C/L Biplane Floatplane
    clean :)
    all formers complete :)
    got article :)
  • Submitted: 14/03/2014
    Filesize: 297KB
    Format: • PDFbitmap
    Credit*: theshadow
    Downloads: 2141

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