Compact (oz3414)

 

Compact - plan thumbnail image

About this Plan

Compact. A 30 inch span beginners FF rubber model. From Model Aircraft, May 1961.

Quote: "A simple, rugged, but essentially 'flyable' rubber design for the not so expert modeller. Compact, by Len Ranson

FOR the not-so-expert modeller looking for a simple to build, high performance rubber model, Compact should he an ideal choice. Specially designed to bridge that difficult gap between the elementary beginners' model and the advanced contest machine, it combines a lively, easy to trim, performance with a rugged ability to survive the heartiest prang.

Some modellers might find the sheet sided fuselage an unusual feature in a small lightweight, but the net increase in weight is of a negligible order, partly because of the small cross section this type of construction allows. On the credit side it gives a virtually crashproof structure with robust handling qualities.

All other components, including the folding prop assembly, are equally rugged and uncomplicated, and, provided your model is carefully built, it should give you many strenuous hours of flying field pleasure - if you don't forget the D/T.

Fuselage. Choose a softish sheet of balsa for the fuselage sides. The grade should be just firm enough to be cut cleanly without crushing. And, remember, for soft balsa a really sharp cutting tool is necessary. Prepare one side from the plan by lightly pasting a tracing over the balsa, then use this completed side as a template for the other. Notch as shown and glue in the vertical braces and motor peg strengtheners, not forgetting to cross grain the latter to the fuselage. The spacers can now be inserted, working from the centre section out-wards with constant reference to the plan for alignment. Finally add the wing mount, the supports of which are of 3/32 in sheet, with the upper edges slightly concaved to take the 1/8 in dowel runners.

Wing. Prepare a rib template from thin plywood or metal, noting that each rib is notched into the trailing edge. Build the wing in one piece by pinning down the leading and trailing edges over the plan, with a 1/32 in packing under the front of the TE. After inserting the ribs fit the centre spar, then cut the outer panels free. The spar ends can now be cut to the 3 in dihedral angle required, and the panels propped up and firmly cemented in place..."

Supplementary file notes

Planfile includes article.

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Compact - completed model photo

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User comments

The dihedral breaks as shown on the plans begin at different points on each side of the wing. One side shows the dihedral beginning at the 7th rib in from the tip and the other shows it beginning 6 ribs in. Examining the attached photo suggests that the 6th rib in is the correct place to begin the dihedral. I built the ship accordingly and I can report it flies very well.
BrianTutunjian - 22/10/2015
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* Credit field

The Credit field in the Outerzone database is designed to recognise and credit the hard work done in scanning and digitally cleaning these vintage and old timer model aircraft plans to get them into a usable format. Currently, it is also used to credit people simply for uploading the plan to a forum on the internet. Which is not quite the same thing. This will change soon. Probably.

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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