Teeny Trainer (oz6689)

 

Teeny Trainer (oz6689) by John Rutter from Radio Modeller 1990 - plan thumbnail

About this Plan

Teeny Trainer. Radio control trainer. All-sheet design.

Quote: "A basic, inexpensive 37in wingspan trainer for .75 - 1.5cc diesel engines and 2 channel radio gear. Ideal for beginners."

Direct submission to Outerzone.

Quote: "If your idea of the ideal trainer is something powered by a .40 hauling 4-1/2 lbs of model around whilst waggling the sticks of a very expensive four-channel R/C set, turn past this article! If that is your ideal but you can't afford such a beast then perhaps this will be of interest to you after all.

This model is designed to be cheap to build and run, powered by anything from an .049 to a 1.5 cc diesel and cheap two-channel radio gear. Mind you, a 1.5 cc puts it past the raw beginner. The original model has had all these sizes of moinr at one time or another! The cheapest option is probably to use .75 cc diesel (no glow battery or clip to buy or worry about) as the fuel costs will be very low despite the apparently high cost of diesel fuel, because so little of it will be used per flight. I used two-channel 27 Mhz gear because it's cheap and I have never experienced any interference despite the abundance of other users of the frequency. The wing and tail are all sheet for cheapness and simplicity and, all told, the model needs barely more than six sheets of wood! Not using wheels saves weight, drag and expense as well as giving one less item to break when the thing hits the ground!

Let's get carving! Construction could hardly be simpler. The sheets for the wings need to he fairly springy medium weight to avoid being either for heavy or too weak. Make sure that they will butt together nicely without gaps, then tape the join on one side. Turn the pieces over and open the gap using the tape as a hinge, put a bead of glue along the join and leave it tape side down with some weight on top to set. It's advisable to use a bit of scrap 1/4 in wood to do the anti-warp tips though you might get away without them.

The same procedure is used to glue the tips in place. When all this is set the tips are shaped, the front of the wing is rounded off and the back of it can be taken down to a fairly thn edge, no thinner than 1/16 in or it will be too weak. Find the middle of the wing and mark it accurately square with a try square, cut the wing in half along the line and sand the edges with a block and grasspaper to give a slight bevel to the edge, this is to approximate the dihedral angle anid give a stronger join..."

Supplementary file notes

Article, thanks to RMCarter.

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Teeny Trainer (oz6689) by John Rutter from Radio Modeller 1990 - model pic

Datafile:
  • (oz6689)
    Teeny Trainer
    by John Rutter
    from Radio Modeller
    September 1990 
    37in span
    IC R/C Trainer
    all formers complete :)
    got article :)
  • Submitted: 30/05/2015
    Filesize: 156KB
    Format: • PDFbitmap
    Credit*: Karsten

Teeny Trainer (oz6689) by John Rutter from Radio Modeller 1990 - pic 003.jpg
003.jpg
Teeny Trainer (oz6689) by John Rutter from Radio Modeller 1990 - pic 004.jpg
004.jpg

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User comments

Steve, Please find attached: The article for John Rutter’s ‘Teeny Trainer’ from September 1990 Radio Modeller magazine – to go with your existing plan. I built one of these back then, powered by a PAW 100 with a 7x6” prop and standard 2ch radio (225 Ni-Cd). It flew really well and I would recommend it as well worth the (minimal) build time and expense. No doubt a small out-runner would work wonders today. As it says in the article, the built-up wing is not really necessary and mine flew fine with the flat 1/14” balsa plank! It was finally retired when the structure became saturated with diesel fuel but it never suffered any crash damage.
RMCarter - 15/06/2015
Thanks to Karsten for the pics of his completed Teeny Trainer model [see more pics 003, 004].
SteveWMD - 18/06/2015
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