Big Birdi (oz12790)


Big Birdi (oz12790) by John Torrance 2021 - plan thumbnail

About this Plan

Big Birdi. Radio control sailplane model for electric power with brushless motor. Wingspan 99 in, wing area 1047 sq in. For 2 channel RC.

Note the original Big Birdy kit from Bridi Hobby circa 1970 was an unpowered sailplane. This here is modern re-drawn plan by Johhn Torrance, in an attempt to 'rebuild' the plan from scratch. See details below.

Quote: "The Big Birdi was designed and kitted in the seventies by Bridi Models. I built and flew one for a long time. It was a great thermal glider and flew well. Move forward all these years and all I had was the rib templates left. No plans and I could not find or get access to a set of plans. I did manage to find some pictures of the plane, kits and small parts of the original drawings, so I decided to redraw the aircraft drawings from the pictures and part plans. Fortunately one picture had the plane held vertically and was clear enough to scale from and given I had the wingspan and fuselage lengths that were on the original kit box it was possible to redraw the plan.

I first drew the plans up as a glider as it was. I then drew a version for electric power, using a brushless motor ... I have not built this version but have built and converted enough gliders in the past 30 years and am sure it will fly well. There are 4 sheets: Fuselage, LH Wing, RH Wing, and a Parts drawing. Regards,"

Direct submission to Outerzone.

Quote: "Hi Outerzone, I have been looking at plans in your fabulous site. My work background was CAD drawing and I have been drawing accurate plans of aircraft that interest me since I retired a few years ago. I fly RC gliders and electric gliders mainly and my interest is with these aircraft plan drawing wise.

Some of the plans you have are due to scanning pretty difficult to read or print due to age and condition of origional plans. I want to try and preserve some of these aircraft drawings so people can keep building them, those that want to build that is."


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

Big Birdi (oz12790) by John Torrance 2021 - model pic

  • (oz12790)
    Big Birdi
    by John Torrance
    99in span
    Electric Glider R/C
    all formers complete :)
  • Submitted: 28/01/2021
    Filesize: 1161KB
    Format: • PDFvector
    Credit*: JohnTorrance

Big Birdi (oz12790) by John Torrance 2021 - pic 003.jpg
Big Birdi (oz12790) by John Torrance 2021 - 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):


* 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, 2011-2021.

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.