Stuka Stunt (oz6225)


Stuka Stunt (oz6225) by Hi Johnson 1960 - plan thumbnail

About this Plan

Stuka Stunt. Control line stunt model.

Quote: "One of the most spectacular scale-stunt aircraft ever designed, this unique ship a fine project for that .29 or .35. Stuka, by Hi Johnson.

Our first approach to stunt was the barn-door type which, if well balanced aerodynamically and statically, turned in some beautiful flights. As we made progress, the stunt pattern was evolved, and each judge and pilot had his interpretation of a good maneuver. Finally the AMA gave us pictures and descriptions which settled all arguments. Stunt pilots knuckled down to some real precision flying. This put pressure on the airplane and its powerplant.

Many approaches to scale in stunt ships have been tried. The Stuka has been a favorite of mine, especially since the wing planform places the bulk of the area close to the fuselage, where the moment arm (area moment) is short. This makes it ideal for calm or windy weather, and for slow or fast flying.

The polliwog airfoil, if used on a rectangular planform, is a slow flier but, if used on a fast taper, works beautifully through the full range; and is fine for a good stunter without flaps. The Stuka is designed around the 1.9 to 1 longitudinal-moment ratio and it is necessary to use a factor of .209 times the root chord for the stabilizer differential, between the chord line of the wing (at the root) to the chord line of the stabilizer. In other words, this Stuka is 10 inches from the center of the engine mass to the center of pressure of the wing, and 19 inches from the center of pressure of the wing to the hinge line of the stabilizer.

Since the Stuka is a high-performance ship, careful alignment during construction is a must, and warps must be kept out of the wing. If your airplane, for instance, tends to do tighter insides than outsides, a little downthrust corrects it.

Your ship should be balanced where shown, or forward. I leave wing-tip weight up to the builder because I feel anyone building this ship is a polished flier and has his own opinions. Five Stukas built ranged from 38 to 45 ozs. It is important to keep the aft sections as light as possible. (Better nose-heavy than tail-heavy.) Two required 1 oz of solder in the backplate.

The Stuka lends itself to variation. I would not advise shortening the tail moment, nor would I decrease the size of the stab and elevator without lengthening the tail moment. A lot of the fliers frowned on the stiff main gear, but after flying it were inclined to like it. The Stuka lands as well into the wind as it does downwind - an indication of exceptional penetration qualities.

Construction. After filling notches, and working in cramped quarters when installing controls, tail wheel details with problems of alignment, I tried the box method for ease in general construction and alignment. Build the box, wing, and stabilizer assemblies complete up to the covering. Install the controls in the wing complete...."

Update 24/09/2018: Replaced this plan with a clearer copy, thanks to ffrankie. This is an Uncle Willies plan.

Direct submission to Outerzone.

Supplementary file notes

Previous scan version.


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

Stuka Stunt (oz6225) by Hi Johnson 1960 - model pic

  • (oz6225)
    Stuka Stunt
    by Hi Johnson
    from Model Airplane News Annual
    59in span
    IC C/L LowWing Military Bomber
    clean :)
    all formers complete :)
    got article :)
  • Submitted: 29/12/2014
    Filesize: 575KB
    Format: • PDFbitmap
    Credit*: dfritzke, JJ, ffrankie
    Downloads: 2470

Stuka Stunt (oz6225) by Hi Johnson 1960 - pic 003.jpg
Stuka Stunt (oz6225) by Hi Johnson 1960 - pic 004.jpg

Do you have a photo you'd like to submit for this page? Then email

User comments

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



Download File(s):
  • Stuka Stunt (oz6225)
  • Plan File Filesize: 575KB Filename: Stuka_Stunt_Hi-Johnson_oz6225.pdf
  • Supplement Filesize: 1290KB Filename: Stuka_Stunt_Hi-Johnson_oz6225_article.pdf
  • Supplement Filesize: 1111KB Filename: Stuka_Stunt_Hi-Johnson_oz6225_previous.pdf
  • help with downloads


* 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.


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, 2011-2024.

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.