Bluebird

 

Bluebird - plan thumbnail image

Bluebird - completed model photo

Bluebird  
by Charles Mackey
from Flying Models
September 1957 
42in span
Tags: IC C/L
all formers complete :)
got article :)


Submitted to Outerzone: 07/10/2017
Outerzone planID: oz9301 | Filesize: 2484KB | Format: • PDFbitmap | Credit*: JJ

   

About this Plan

Bluebird - Control line stunt model, for Fox .29 power.

Quote: - "The 'Bluebird' is approximately the twelfth in a series of designs of smaller-sized stunt ships - the idea being to use standard size wood and cut costs and required space without loss in appearance or sacrifice in performance. We will give you the ideas that went into the Bluebird, but we do not mean to imply that they will hold true on any stunt ship. The wing was worked out with the standard 36in length of balsa in mind so no splicing was necessary. The D tube structure was chosen for its light weight and extra strength, which is required to support the landing gear. Oversized flaps were used to compensate for the smaller wing area with the movement cut down to 20 degrees in each direction to prevent stalling. With this method, you get the lift when you need it. We think this gives better results than the larger ship without flaps that has a lighter wing loading, especially in the wind.
We have read that a 25% symmetrical airfoil has little more drag than a 15% foil. In practice, however, the thicker wing ship seems much slower. We use a thick wing section for slower speed and extra lift. We have had no trouble with high, speed, stalling on this design. The taper in the leading edge is strictly for appearance. We have found. that the straight leading edge with blunt tips has a tendency to flop around in a small radius.
The Bluebird was designed around a Fox .29 and a Froom tank. Since then Bluebirds have been flown with 19, 29, and 35 displacement engines. A .23 or .25 should work excellently. You can usually adjust your speed by a change in fuel, prop, plug or needle valve setting. Usually we find it takes two or more changes to make the desired adjustment. If you prefer extra slow flying, we suggest a small spinner or a drag tab on the outside wing tip. If .35 engines are used, add tail weight as necessary..."

This was Charles Mackey's first published design.

Direct submission to Outerzone.

Supplementary files

Planfile includes article pages.
Parts sheet.

Corrections?

Did we get something wrong with this plan? That happens sometimes. Help us make a correction

 

User comments

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

 

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, 2011-2017.

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.