Ryan Dragonfly (oz14723)


Ryan Dragonfly (oz14723) by Dick Ealy 1953 - plan thumbnail

About this Plan

Ryan Dragonfly. Free flight scale model. Wasp .049 engine shown.

Direct submission to Outerzone.

Update 5/8/2023: Added article, thanks to RFJ.

Quote: "This sure-fire scale free-flight model has 224 inches of wing area, 39 inch span and weighs 11 oz. Dragonfly, by Dick Ealy.

A scale free-flight model is a challenge to a builder's ingenuity, experience and workmanship. The difficult part comes in choosing a scale configuration that will lend itself readily to model flying. The Ryan Dragonfly YO-51 observation plane was chosen from hundreds of drawings as the one which is most nearly perfect for a scale free-flight model.

The full-scale YO-51 features unusual flight characteristics and sensational ability to make short, steep take-offs and nearly vertical landings. Developed for liaison work for the US Army, it has a minimum flying speed of only 32 mph. Slots run along the entire leading edge, and flaps along the entire trailing edge.

Proportions of the model are close to that of a contest pylon job. Note the short nose and long tail-moment arms and extra large stab, all of which produce a smooth, flat glide. The wide gear is well forward, avoiding ground-loops on take-offs.

Construction is simple, so let's get started on your 3/4 in to 1 ft scale Dragonfly. Plans are half-size (except where indicated), so draw everything twice up before you begin.

FUSELAGE: Start with the fuselage. Pin 1/8 square hard balsa stock to the drawing and cement one complete side panel together. When dry, build the second side panel on top of the first. After the cement dries, remove the sides and separate them from each other. Place extra cement on the cross-pieces for added strength.

Notch the longerons on the inner side of section F and bend them toward the center line. Set up both panels inverted on a table, adding the 1/8 square crosspieces from sections F to J. Now fill in sections A, B and C with 1/8 sheet balsa..."

Supplementary file notes



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

Ryan Dragonfly (oz14723) by Dick Ealy 1953 - model pic

  • (oz14723)
    Ryan Dragonfly
    by Dick Ealy
    from Flying Models
    June 1953 
    39in span
    Scale IC F/F Parasol Military
    clean :)
    all formers complete :)
    got article :)
  • Submitted: 25/06/2023
    Filesize: 433KB
    Format: • PDFbitmap
    Credit*: dfritzke
    Downloads: 278

  • Ryan_YO-51_Dragonfly | help
    see Wikipedia | search Outerzone
    Test link:
    search RCLibrary 3views (opens in new window)

    ScaleType: This (oz14723) is a scale plan. Where possible we link scale plans to Wikipedia, using a text string called ScaleType.

    If we got this right, you now have a couple of direct links (above) to 1. see the Wikipedia page, and 2. search Oz for more plans of this type. If we didn't, then see below.

    ScaleType is formed from the last part of the Wikipedia page address, which here is https://en.wikipedia.org/wiki/Ryan_YO-51_Dragonfly
    Wikipedia page addresses may well change over time.
    For more obscure types, there currently will be no Wiki page found. We tag these cases as ScaleType = NotFound. These will change over time.
    Corrections? Use the correction form to tell us the new/better ScaleType link we should be using. Thanks.

Ryan Dragonfly (oz14723) by Dick Ealy 1953 - pic 003.jpg
Ryan Dragonfly (oz14723) by Dick Ealy 1953 - pic 004.jpg
Ryan Dragonfly (oz14723) by Dick Ealy 1953 - pic 005.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):


* 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.