Mustang P-51B (oz231)

 

Mustang P-51B (oz231) by Earl Stahl from Model Airplane News 1944 - plan thumbnail

About this Plan

P-51B Mustang (Model Mustang). Free flight rubber scale model.

Quote: "THE North American P-51B Mustang featured on our cover this month is of ideal layout and its favorable design makes it highly satisfactory for a scale model with good flying qualities.

The plan is for a balsawood model, but if the builder is unable to obtain sufficient balsa for the whole job, pine or similar material may be substituted without impairing the model's flying ability.

Conventional construction methods are followed. Be sure to do the work neatly and accurately, and exercise care to cement all joints firmly. Where pine or other such wood is substituted, the thickness of the part should be reduced since the material is stronger.

Construction: Full size plans are presented, and with the exception of one wing and stabilizer half, no redrawing will be necessary; work right over the plan to simplify and speed construction. Make the wing first. It is built in two halves which are later joined. Ribs Nos.1, 2, 3 are 1/16 thick balsa while the others are 1/32. Cut and sand the ribs carefully to exact shape. The leading edge and spar are cut from sheet, balsa and are tapered as indicated. Assemble the parts over the plans using pins to hold them in place; cement the joints solidly. Trim the leading and trailing edges as well as, the 1/8 sheet tips roughly to shape; then sand the whole structure.

Use of the keel and bulkhead method simplifies the fuselage construction. Cut two of each bulkhead from 1/16 sheet. To assemble, pin the top and bottom keel in place on the side view and attach the half bulkheads. Add the side keel, and when this structure is dry remove from the plan and add the remaining bulkheads and keel. Now place the 1/16 sq. stringers starting nearest the side keel; be careful to keep from disaligning the frame by adding a stringer to each side at the same time. Cut the notches as required, and be careful to align them perfectly.

At the recess for the wing, curved pieces of 3/32 sheet are required. They are similar to the center keel in shape and they should fit the curvature of the wing neatly. Two pieces of 1/4 in sheet cemented together form the nose block; roughly cut it to shape before cementing to bulkhead No.1. Note that the center of the nose block is cut out to receive the nose plug. In the rear where the rubber holding bamboo pin is mounted, attach hard sheet retainers. For the curved windows behind the pilot's cockpit a frame is required; it is carved from several pieces of sheet balsa.

On the real P-51 a radiator is mounted under the belly. This was eliminated on the original model in the interest of better flights. Those desiring maximum scale will want it, however, therefore crossections are shown. It may be of built-up construction or hollowed out from a solid block of balsa. It is best to leave the radiator off until the wing has been covered assembled to the fuselage..."

Update 1/03/2017: Replaced this plan with a clearer copy, stitched together as single sheet, thanks to Pilgrim.

Direct submission to Outerzone.

Supplementary file notes

Article pages, thanks to gthunter.

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Mustang P-51B (oz231) by Earl Stahl from Model Airplane News 1944 - model pic

Datafile:

Mustang P-51B (oz231) by Earl Stahl from Model Airplane News 1944 - pic 003.jpg
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Mustang P-51B (oz231) by Earl Stahl from Model Airplane News 1944 - pic 004.jpg
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Mustang P-51B (oz231) by Earl Stahl from Model Airplane News 1944 - pic 005.jpg
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User comments

This is an Allison powered P-51A.
zef - 14/05/2019
If you like. But the fact is that we're talking about a plan for a flying model, not a real world prototype. The plan was published by MAN in May 1944, and they described it in the text, on page 9, as the 'North American P-51B Mustang'. They had a front cover for that month, with the words: 'Mustang P-51B' on it. So that's the plan title we will be using here, too. That's just the way this site works. Think of it this way: we simply record the history of each plan, no matter how inconvenient it is :)
SteveWMD - 14/05/2019
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Scaling

This model plan (like all plans on Outerzone) is supposedly scaled correctly and supposedly will print out nicely at the right size. But that doesn't always happen. If you are about to start building a model plane using this free plan, you are strongly advised to check the scaling very, very carefully before cutting any balsa wood.

 

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