Trainer 40 (oz10529)


Trainer 40 (oz10529) by Joe Bridi 1982 - plan thumbnail

About this Plan

Trainer 40. Radio control trainer model. Wingspan 59 in, wing area 634 sq in, for .25 to .45 power. Discontinued kit from Great Planes.

This Joe Bridi design was first published in 1972 as the RCM Advanced Trainer (oz5306), this here is a later version, as kitted by Great Planes, with some minor changes in wingtips, tailsurfaces, etc.

Direct submission to Outerzone.

Update 13/10/2020: Kit instructions in full (40 pages in total) are available as a free download (note large filesize at 18MB) from

Quote: "There's no better place to start than one of Great Planes' Trainers when it comes to building your first R/C model airplane. These Trainers are extremely easy to build. The machine cut and sanded parts go together fast and accurately. And accuracy is important when building a model; you need a straight wing and fuselage to assure that the model flies straight and true. The design of the Trainer with its large wing area and long tail moment offers stable flight which is very important when learning to fly. We urge you to build on a flat surface so you will end up with a model with no warps or twists.

This photo instruction book will take you through step by step from start to finish. It is suggested that you read through these instructions and identify and mark the parts before you begin assembly. Refer to the plans and parts list for actual sizes of parts and materials needed to finish your model, whether it is the Trainer Twenty, Forty or Sixty.

Use the plans as a guide only as the paper they are printed on has a tendency to change size with moisture. Use the parts themselves as they are self aligning and will fit together accurately..."

CAD file

This plan is available for download in CAD format.


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

Trainer 40 (oz10529) by Joe Bridi 1982 - model pic

  • (oz10529)
    Trainer 40
    by Joe Bridi
    from Great Planes
    59in span
    IC R/C Cabin Kit
    clean :)
    all formers complete :)
  • Submitted: 07/10/2018
    Filesize: 397KB
    Format: • PDFvector • CADfile
    Credit*: AlanSinclair
    Downloads: 3287

Trainer 40 (oz10529) by Joe Bridi 1982 - pic 003.jpg
Trainer 40 (oz10529) by Joe Bridi 1982 - pic 004.jpg
Trainer 40 (oz10529) by Joe Bridi 1982 - pic 005.jpg
Trainer 40 (oz10529) by Joe Bridi 1982 - pic 006.jpg

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

User comments

Can anyone put a date on when this kit first came out? Thanks.
SteveWMD - 16/10/2018
I have the AMA copy of the Great Planes Trainer .40 kit plan and there is no date on the plan. But I would place the date at 1982.
According to the Great Planes website, Great Planes was started in 1982. Most of the Great Planes early initial kit offerings were reworked Bridi plans by Don Anderson. The Great Planes Trainer series was basically the RCM Trainer with a few tweaks. I learned to fly with this airplane in 1984 so it was available then.
The entire early Great Planes trainer offerings were eventually scrapped for the PT 20-40. which was a shame because the Trainer series were excellent flying airplanes. They could fly and land at a crawl and yet do much of the FAI pattern if set up properly. The PT series flew like a kite with an engine, which was OK for learning to land, but not much else.
The original Great Planes kit plan for this model is now in the Academy of Model Aeronautics plan data base. It can be purchased from them with the huge AMA watermark embossed on the plan. Plan# 50951.
JohnnyB - 17/09/2019
Got it thanks, have set the date on this one now to 1982.
SteveWMD - 17/09/2019
I had this plan printed at Staples. Admittedly the people in Staples have no idea what to do when you want a model plan printed. Anyway my copy has a wingspan of 62.75” not the 59 it was supposed to have. So check your plan if you have it printed.
David Pentland - 18/07/2020
Hi David, measuring the half-wing span on the plan and multiplying by two I got 59.6" , which to me would be close enough. Printing at 100% scale factor would be perfect.
I'd imagine those Einsteins at Staples got somehow confused and decided to print at some factor to fill the paper size. Wrong idea, they have to print the PDF file at 100% or 1:1 scale, no more, no less.
I have confirmed the drawing scale by measuring other elements like the main wheels which gave the correct 2.5" so I wouldn't mind this 0.6" difference between 59.6" and 59". At a pinch you may wish to narrow those wingtip blocks by some 3/8".
Miguel - 19/07/2020
What does the scale bar measure? Have found discrepancies in the past between actually measuring span and title block scale bar. After rescaling a drawing, I usually try to verify the wing span by measuring.
Circlip - 20/07/2020
Hi Circlip, I measured the scale bar using the Adobe Reader tool as in my message above and I got 6.00", which means that Mr Sinclair is serious about his inches.
Outerzone Steve & his merry company of helpers may commit an occasional dimensional error but those are rare and quickly corrected, so I'm not developing an ulcer about that.
Concerning that 59 - 59.6 discrepancy I see those OZ wingspan measurements on file as nominal only, I have no objection if the plan is rated 65in but measures in fact 64 3/4 in. A 1inch size bracket is enough for me for comparison purposes or whatever, detailed examination may refine refine this if needed.
Miguel - 20/07/2020
Sorry Miguel, you misunderstood my comment. NO reflections on Steve and O/Z. My point was, when we submit PDFs to O/Z, although the scale bar measures "Correct" length, the original drawing may not have been the correct size BEFORE the scale bar was added to it. This is the original PUBLISHERS error. Plans submitted to the magazines are usually re-drawn and in the past, "Errors" have crept in. After "Tiffling" something like 2000 plans, DAMHIK. Regards Ian.
Circlip - 21/07/2020
Please allow *me* to say sorry, I made what I thought was a general comment but it ended up poorly worded, of course I have no fingers to point to any or all of the entire oz crew, if this is a hobby then it's a very professionally managed one :-)
Some 2,000 plans cleaned so far is quite a lot, I imagine this must be penance for some awful sin! Joking apart, thank you. It is a tremendous effort and to be frank I never expected to see oz growing to 12,000 plans and ticking!
Miguel - 21/07/2020
Hi Mary, Here are some pictures of a recently completed Great Planes Trainer 40 built from plans [main pic, 003-005]. It's covered with Ultracote and powered with an OS Max 40SF. This is the second one I've built. I learned to fly with T-40 #1 back in the 80's. A trip down memory lane for me, this is an excellent flying airplane. For more pictures and article check out
Awesome site! Regards,
JohnnyB - 13/10/2020
These planes have completely disappeared in the Belgian flying clubs. I've been flying home behind my house since 1973, I still fly these motor planes there. I am flying with OS 25 FSR ABD and OS 25 FS 4T, these are very economical, as the fuel has now become very expensive.
I usually fly with Belgian models Svenson and Lazer Models and a few German Graupner, Robbe and Hegi, here my Belgian models
Good luck with trainer 40. Regards Julien
Julien Vermeire - 14/10/2020
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.