Challenger (oz3625)

 

Challenger - plan thumbnail image

About this Plan

Challenger. A 56 inch span semi scale FF power. From Model Aircraft, May 1950.

Quote: "An attractive semi-scale power model. Challenger, by JA Newton.

CHALLENGER will appeal to those who like their models to look something like the real thing and yet have a good flight performance. It is a good all-the-year-round model and will stand up well to the inevitable hard knocks from all-weather flying. The construction is quite straight-forward and is unlikely to present any difficulties to the average aeromodeller.

The Fuselage. Build two sides on the plan in the usual manner. When dry remove and cover with 1/16 in sheet. Remember to make a right and left side - it is easy to boob here, I know, I've done it! Join the two sides by means of the cross pieces. The next job is to fix the centre-section struts in place, this must be done securely, using plenty of cement and plastic wood. Add the semi-circular top decking formers and sheet the top and bottom.

Now cement the undercarriage tubes in place, again using plastic wood for strengthening purposes. Cement a piece of 3/16 in balsa sheet between the tubes and face with 1/16 ply to provide a secure fixing for the bolt which holds the undercarriage springs. The knock-off engine mounting is of the usual type and requires no explanation here.

A 2 cc ED Competition Special was used on the original model and it provided ample power. Anv other motor of similar capacity could be used instead and the design permits of either upright or inverted mounting. The sides and bottom of the engine cowling are shaped from 1/2 in sheet and rounded to shape after assembly. The top cowling is carved from soft block, hollowed out to suit engine and fixed with dress snap fasteners. The centre-section should now be completed, making sure to get the angle of incidence correct. The wheel spats are an optional fitting.

The Wing. The construction of the two wing halves is quite straightforward. Before cementing the tongue into position, incline the first rib to give 3 in dihedral at the wing tips. Be sure to select hard balsa for the leading and trailing edges and the spars..."

Update 20/09/2013: Added an alternate version of this plan, as a supplement, thanks to JJ.

Update 23/09/2013: Replaced the alternate plan with a correctly scaled version at 56in span, thanks to RogerC.

Supplementary file notes

Planfile includes article.
Alternate version, this one has a plain white background.

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Challenger - completed model photo

Datafile:

002.jpg
002.jpg

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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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