Harvard IIB (oz13017)

 

Harvard IIB (oz13017) by T Wordell 1950 - plan thumbnail

About this Plan

Harvard IIB. Control line scale model. Wingspan 40-1/2 in.

Quote: "THIS model of the well-known RAF trainer makes an ideal scale stunt model due to its reasonably short moment arm, and fairly large elevators. At first it was thought that the large cross-sectional area would reduce its performance, but this fear was unfounded; it is in fact capable of all the usual stunt manoeuvres, except vertical eights and square loops; and who ever heard of a Harvard doing either anyway!

Construction: First tackle the centre section. Cut the top and bottom panels to size from 1/16 sheet. It will be necessary to join sheets to get the required width. Take the bottom sheet and cement on to it ribs 1 and 2, then glue the spars A and B in place and add the leading edge. Chamfer down the sheets at the trailing edge and cement the top sheet in place. Cut away the top sheet between the two centre ribs and in front of and behind spars A and B respectively.

Having finished the centre section, next cut out formers 1, 2 and 3, cement them on to the engine bearers then cement formers 2, 3 and 4 to the centre section. Cement the crutch to the formers and fit the remaining formers to the crutch, the fuselage can then be planked with is in. sheet and the tank and bellcrank fitted.

Cut out the cockpit frames 2b, 2c and 2d and cement them to the fuselage, cement the celluloid over the frames and add yellow doped paper to represent the frames. The papier macho fairing behind the cockpit is fairly simple to make; first leave the planking right up to former 5a and mould plasticene on the wood to the required shape, cover the plasticene with about five layers of newspaper soaked in Grip-fix paste and water and leave to dry. When dry remove the fairing from the fuselage, remove the plasticene and sand down the fairing, cut the planking away and cement the papier macho fairing in its place. The wheel-well and wing root fairings are made in exactly the same way.

The tailplane construction is quite straight-forward and is cut from 1/8 sheet balsa. The elevators are joined by a strip of spruces 1/8 x 1/2 in and the hinges are the usual linen type. They should be especially long to hold the balsa and spruce together. Make the control horn as shown, and attach it by a single 6 BA nut and bolt. Cement the tailplane securely to the fuselage.

The wing construction is that used on Jim Walker's Fireball (oz5746) and is extremely strong for its weight as well as giving the appearance of a stressed skin wing. First cut the panels from 1/16 sheet medium balsa to the outline shown on the plan, this is the outer line to allow for the camber of the wing, it will be necessary to join several sheets to get the required width at the roots. Sand the sheets smooth, and bevel the trailing edges. Note: All sanding of wing panels should be done before assembly, otherwise the sheet will wear thin where the ribs are cemented. Cement ribs to the lower sheet, add leading edge, and cement top sheet in place. Add wing tips. Make sure that the root rib is at an angle to give the correct dihedral. Butt join the wings to the centre section, and cover the joint with a 1 in wide strip of linen well soaked in cement.

Finish off the wing by putting 3/4 oz of lead in the starboard wing tip, and fitting the lead out guides on the port.

The fin construction is similar to that of the wing and centre section. First cut 1/16 sheet to the shape shown on the plan, then cement the spars and ribs on to it, cementing the top sheet over this. The rudder has about 12° offset.

Cement the oil cooler, tailwheel, etc, in place and give the whole model a coat of clear dope; lightly sand down and cover with rag tissue. The model may be doped, either yellow or silver, if silver is chosen it should have a yellow stripe on the wings and fuselage. In both cases there should be a black anti-glare strip in front of the cockpit. The normal roundels and markings may be added.

A drop-out undercarriage may be fitted if desired - the dimensions are given on the plan. The model can be flown on 65 to 70 ft lines and with the 'Frog 500' or similar motor giving that typical Harvard note she looks and flies just like the real thing."

Harvard, Model Aircraft, November 1950.

Direct submission to Outerzone.

Supplementary file notes

Article pages, thanks to RFJ.

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Harvard IIB (oz13017) by T Wordell 1950 - model pic

Datafile:
  • (oz13017)
    Harvard IIB
    by T Wordell
    from Model Aircraft
    November 1950 
    40in span
    Scale IC C/L LowWing Military
    clean :)
    all formers complete :)
    got article :)
  • Submitted: 05/04/2021
    Filesize: 656KB
    Format: • PDFbitmap
    Credit*: Circlip, RFJ
    Downloads: 636

ScaleType:
  • North_American_T-6_Texan | help
    see Wikipedia | search Outerzone
    ------------
    Test link:
    search RCLibrary 3views (opens in new window)


    ScaleType: This (oz13017) is a scale plan. Where possible we link scale plans to Wikipedia, using a text string called ScaleType.

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Scaling

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