Trainer 40 (oz10529)
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, with some minor changes in wingtips, tailsurfaces, etc as kitted by Great Planes.
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User commentsCan 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
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