RCM Trainer Jr (oz6465)


RCM Trainer Jr (oz6465) by Joe Bridi 1974 - plan thumbnail

About this Plan

RCM Trainer Jr. Radio control sport/trainer model.

The original RCM Trainer (oz5306) appeared in RCM Jan 1972. This is a later, reduced-size version, for 40 power.

Quote: "Another reliable, good flying 60 becomes a reliable, good flying 40. An aerodynamic design that makes for slow, stable flying when you want it but, will loop, roll, spin, fly inverted. The .40 size offers more economical flying, more convenient storage, and easier transportation to and from the flying field.

What goes into the design is only part of the story. What you make out of it is the other part. To get a good flying ship the parts must be cut and assembled correctly, accurately, and with care. Begin with a flat building board. When you glue a part in place, make sure it is properly aligned - and stays that way while the glue dries. Use pins, spring loaded clothespins, clamps, masking tape, elastic bands, spring loaded paper clamps, weights, blocks, or whatever you have handy that will do the job. When you use other than epoxy glues, double-double glue all of the joints. Put glue on both surfaces to be joined, wait a few minutes for the glue to soak in, apply a bit more glue, as necessary, and join the surfaces. When you use epoxy apply it to both surfaces before you join them.

When it comes to adhesives we recommend you use aliphatic resin glue, specially formulated for use in modeling work. In using this or any other glue, spread it thin. Except in some special cases, building glue up around the glue joint doesn't help at all. As a matter of fact, a blob of glue around a joint may actually keep the glue from drying properly and give you a weaker glue joint! Use a glue stick or rag to remove excess glue. It helps keep the plane a bit lighter, too!

The sequence we'll follow begins by putting the stabilizer together and installing the pine insert into the elevator and rudder. Then you'll work on the fuselage, which is built upside down on your building board. First the top block or fuselage top is built, then the sides and bottom are installed. Finally, the cabin front and read blocks and sides are glued in place and the rudder and elevator are hinged. Note that the nosegear is mounted on the engine mount - in holes drilled for that purpose.

With the fuselage completed, the wing halves are built, ideally on a wing jig to insure warp-free construction. The wing halves are joined, the center section is sheeted, and the center is glassed. Finally, the ailerons are finished and installed and you're ready for the final alignment. Finish it, install your radio equipment, check out the operation of the surfaces and have fun. Now that was easy, wasn't it? (See picture #1).

Time to get to work.

Your first job is to read through the entire construction procedure. That way you'll know where you're going before you get there. As you glance through it you'll notice that we put a box in front of each step. Check 'em off as you go. The check marks also make it easier for you to find your place as you read about the next step, do the work, read, do the work, and so on..."

Direct submission to Outerzone. Scanning by Don at EAC, cleanup by theshadow.

Update 18/09/2016: Replaced this plan with a cleaner copy, with some pencil construction lines removed, thanks to Rob.

Update 25/09/2018: Added PDFvector plan tracing and dxf CAD file, thanks to AlanSinclair.

Update 25/09/2018: Added article part 2 (from next month), thanks to AlanSinclair.

Supplementary file notes

Article part 1, thanks to theshadow.
Article part 2, thanks to AlanSinclair.
PDFvector plan tracing.

CAD file

This plan is available for download in CAD format.


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RCM Trainer Jr (oz6465) by Joe Bridi 1974 - model pic


RCM Trainer Jr (oz6465) by Joe Bridi 1974 - pic 003.jpg
RCM Trainer Jr (oz6465) by Joe Bridi 1974 - pic 004.jpg
RCM Trainer Jr (oz6465) by Joe Bridi 1974 - pic 005.jpg
RCM Trainer Jr (oz6465) by Joe Bridi 1974 - pic 006.jpg

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User comments

Hi Steve and Mary, I built an RCM Trainer Jr from OZ plans and a balsaworkbench.com short kit. Attached a few photos, perhaps you can use them [main pic, 006]. My model is silk and dope finish with a period correct OS 40 FSR for power. Cheers,
from Endicott, NY
Scott Wallace - 10/07/2022
My father built one of these back in the early ‘80s. I still have his plane, stripped of covering, in a closet. When I went to look up his plane on OZ, I found myself looking at Joe Bridi’s Trainer 40 (oz12744) Great Planes kit. I eventually caught on that the Great Planes Trainer 40 is not my father’s RCM Trainer Jr that had a .40 engine on it. I’ve got to believe I’m not the only one who has mistaken the Great Planes Trainer 40 for being the same design as the RCM Trainer Jr. After all, they’re both designed by Joe Bridi. And, at a glance, these two planes look identical. The easy way to identify these two different plane designs is by looking at where the hinge line of the elevator is in relation to where the hinge line of the rudder is. On the RCM Trainer Jr, the hinge line of the elevator is at the trailing edge of the rudder. On the Great Planes Trainer 40, the hinge lines of both elevator and rudder are on the same line. This identification method also applies to the RCM Trainer 60 (oz5306) and the Great Planes Trainer 60 (oz7802).
AaronKV - 11/05/2023
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Download File(s):
  • RCM Trainer Jr (oz6465)
  • Plan File Filesize: 651KB Filename: RCM_Trainer_Jr-RCM-560_oz6465.pdf
  • Supplement Filesize: 2141KB Filename: RCM_Trainer_Jr-RCM-560_oz6465_article_1.pdf
  • Supplement Filesize: 2657KB Filename: RCM_Trainer_Jr-RCM-560_oz6465_article_2.pdf
  • Supplement Filesize: 407KB Filename: RCM_Trainer_Jr-RCM-560_oz6465_vector.pdf
  • CAD Zip Filesize: 119KB Filename: RCM_Trainer_Jr-RCM-560_oz6465_CAD.zip
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