High Performance Sportster (oz5564)


High Performance Sportster (oz5564) by CR Johnson 1948 - plan thumbnail

About this Plan

Hi Steve. Here is CR Johnson's High Performance Sportster from Model Airplane News magazine issue 08-48.

Quote: "The credit for originating this type of model should go to Art Schultz, a buddy of mine, who way back in the summer of '41 built a model of about 50 sq. in. wing area which closely resembled a contest stick job. He built it on the theory that such a model would fly much better than the ordinary small 'sport' job. Art could not go to the Nationals and since he thought he ought to be represented in some way, he threw the ship in my box, and we took it along. On the Sunday morning after the contest was over (during the meet we had three fruitless days of thermal hunting), we took the model out and lost it on a 6 minute OOS flight.

We had so much fun with this job that I designed and built the present model. At first we thought the local ball park would be large enough for it, but after climbing every tree in the neighborhood the idea was given up as unsound. The design is basically the same one we have been using for years. A large prop is used - with a comparatively long powerful motor. This gives a long motor run with a high rate of climb. The first good day the model was flown it turned in several flights of 2 to 3 minutes. Then we hit a real one, and the model went 10:45 OOS.

Here's how to build this model which will give you almost contest type performance at practically no expense.

Fuselage. The fuselage should be built from 1/16 sq rock hard balsa. The two sides are built directly over the plan; after they are thoroughly dry, remove and glue in the cross pieces..."

Direct submission to Outerzone.

Supplementary file notes

Article pages, text and pics.


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High Performance Sportster (oz5564) by CR Johnson 1948 - model pic

  • (oz5564)
    High Performance Sportster
    by CR Johnson
    from Model Airplane News
    August 1948 
    20in span
    Rubber F/F
    clean :)
    all formers complete :)
    got article :)
  • Submitted: 03/05/2014
    Filesize: 83KB
    Format: • PDFbitmap
    Credit*: theshadow
    Downloads: 3388

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High Performance Sportster (oz5564) by CR Johnson 1948 - pic 011.jpg
High Performance Sportster (oz5564) by CR Johnson 1948 - pic 012.jpg

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User comments

Hi Steve, I send photos of a model inspired by this plan from construction company Hiesbok [more pics 003-008]. Have a nice day.
Rudolf - 27/04/2016
Wow! What an incredible build.
Brooke Linford - 10/09/2022
Hello Again, Please find attached some photos of my High Performance Sportster, constructed from plans from your super site [pics 010-012]. Thanks in advance. Regards,
Len Bridge - 10/10/2022
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Download File(s):
  • High Performance Sportster (oz5564)
  • Plan File Filesize: 83KB Filename: High_Performance_Sportster-MAN-08-49_oz5564.pdf
  • Supplement Filesize: 510KB Filename: High_Performance_Sportster-MAN-08-49_oz5564_article.pdf
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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.


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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