Corky (oz2937)

 

Corky (oz2937) by Van Hereford from Model Airplane News 1963 - plan thumbnail

About this Plan

Corky. All sheet biplane model. Free flight sport design, for Cox Pee Wee .020 power.

Quote: "Wonderful combination sport flyer and biplane - to us this is irresistable and must be to every free flighter.

A biplane has a certain, indefinable quality which most modelers find irresistible. In designing Corky the basic idea was to produce a model with the classic lines of the modern home-built biplane, and one which would still be a practical, easy to build sport flyer. All-balsa construction results in a rugged, long-lasting model and makes those beautiful ellipses possible with a minimum of building time.

I regret to say that the original recently took off cross country and is now resting deep in some very thick woods. So be sure you know how much fuel is left in the tank!

Begin construction with the wings. The upper and lower are alike in wood size and construction, and differ only in area and dihedral. If you are not lucky enough to find a sheet of 3/32 balsa of the required width for the upper wing, you must splice two sheets of obtain the 5 inch cord. Leave each wing in one piece until you are ready to add the dihedral. Cement the spruce leading edge to each wing blank. This leading edge should not be omitted as it adds greatly to the durability of the model. Using a ball point pen, mark the tip out-lines and rib locations and cut wings to shape. Carve and sand to an airfoil cross-section but don't try for feather-thin trailing edges.

The eight ribs of each wing are cut from hard 1/8 sheet. Turn the wings upside down on your worktable and cement only the trailing edge of each rib in place. All of them should now be standing up off the wing at the same angle. When dry, apply cement to the temainder of each rib, turn the wings right side up, and pin the sheeting down to top of rib. Leave the wings pinned from eight to ten hours. Now trim off the trailing edge of the tip ribs and sand the bottom to form a straight line, joining the leading and trailing edges. Cut the wings apart, taking care to get the correct amount of sweep-back on the upper wing. Bevel the cut edges until you obtain the correct dihedral angle. Place one panel fiat on the worktable and block the other to twice the required dihedral, or 3 in. This is the same for both wings but since the lower wing is shorter, it will have greater dihedral. To complete the wings, glue 1/32 plywood tabs beneath the trailing edge of each wing.

The rudder and stabilizer require no instruction; simply cut to outline and sand to an airfoil shape.

Cut two identical fuselage side patterns from 3/32 sheet and mark off locations of the formers. Make sure that the cut-out for the lower wing fits the top wing contour perfectly, Out the firewall and formers and glue formers A, B, C and D to one fuselage side, checking to be sure that they are at right angles. Now add the other side, and when dry install the firewall, cement rear of sides together, and add formers E and F. When installing the firewall, cheek the fuselage top view to get the correct amount of right thrust.

Bend the 1/16 wire wing supports to the shape shown on the plan. Both the from and rear wing supports are identical except that the rear one is 5/16 shorter to give the correct incidence. Bind them to the 1/16 plywood plates with copper wire, and solder (thread and glue may be substituted). After installing the wing supports in the fuselage, glue the 1/2 in soft balsa fuselage top in place and carve to shape..."

Update 05/02/2014: Replaced this with a clearer copy, thanks to JJ.

Supplementary file notes

Article.

Corrections?

Did we get something wrong with these details about this plan (especially the datafile)? That happens sometimes. You can help us fix it.
Add a correction

Corky (oz2937) by Van Hereford from Model Airplane News 1963 - model pic

Datafile:

Corky (oz2937) by Van Hereford from Model Airplane News 1963 - pic 003.jpg
003.jpg
Corky (oz2937) by Van Hereford from Model Airplane News 1963 - pic 004.jpg
004.jpg

Do you have a photo you'd like to submit for this page? Then email admin@outerzone.co.uk

User comments

No comments yet for this plan. Got something to say about this one?
Add a comment

 

 
 

Download File(s):
 

Notes

* 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.

 

Terms of Use

© Outerzone, 2011-2019.

All content is free to download for personal use.

For non-personal use and/or publication: plans, photos, excerpts, links etc may be used, provided that full and clear credit is given to Outerzone with appropriate and specific direction to the original content i.e. a direct hyperlink back to the Outerzone source page.

Unauthorized use and/or duplication of this material without express and written permission from this site's owner is strictly prohibited. If we discover that content is being stolen, we will consider filing a formal DMCA notice.