Torrent (oz14104)


Torrent (oz14104) by Pavel Bosak 1979 - plan thumbnail

About this Plan

Torrent. Radio control sport trainer model. Wingspan 56 in, for .40 to .60 engines.

Direct submission to Outerzone.

Quote: "The Torrent, I do not know anything about this plane, a shoulder wing RC pattern plane. Appears to have 2 alternate rib patterns. Shows flaps, which is unusual for the period. Good one to throw out to the guys and see if anyone knows anything. Dave"

Update 1/10/2022: Have rescaled this plan up slightly now to correct full size at wingspan 58 in, thanks to RC Yeager.

Update 15/10/2022: Replaced this plan with a clearer copy, thanks to theshadow.

Quote: "Hi Mary & Steve - Please find attached a supplementary plan for Torrent oz14104. Doing a Google search for the missing article only turned up this site, I found reference to scans of RC Sportsman that Brian Mork had done. I emailed an inquiry to him about these scans and asked if he would like me to clean them and post to OZ. He agreed.

The scans turned out to be multiple page jpgs of only 200 dpi. I spent a full, rainy day straightening, stitching and cleaning Bosak's Torrent. The finished product is usable. I couldn't figure out the missing text around the main wheel. Importantly Brian had scanned the article.

Brian will be sending me the rest of his RC Sportsman scans shortly. He only requested to credit his web site as the source of these lost bits of model aviation history."

Update 15/10/2022: Added article, thanks to theshadow.

Quote: "Torrent, by Pavel Bosak.

Torrrent is a training model. Now I should like to say something about the expression 'training.' We can imagine a lot of different models with such an expression. From a model for a mere beginner in R/C to a model for training R/C figures. The Torrent can be used for various levels of R /C pilot training. The first version is for getting used to R/C control. With a 40 engine, use two degrees down and two degrees to the right. The wing has a symmetrical profile, the dihedral is three degrees, the angle of incidence is two degrees plus and stabilizer is 0 degrees. On this model we control engine, elevator and rudder. Later it is also possible to control ailerons.

The second version, B, is suitable for training F3A figures. In this case you can use a 40-60 engine according to the pilot's abilities. Wings with symmetrical profile are built without coning (dihedral). Model setting is 0-0-0. Also the engine is parallel. On the second version we control everything. For advanced pilots I advise the use of a schneurle 40 engine or 60 engine made M older series. (Not an older schneurle!)

The last version of Torrent is version C for flying contest R/C patterns. I shall try to describe what made me build this version. I take part in contests in category F3A with the model Crown (oz12655) (see October issue R/C Sportsman.) Because the base of contest success is almost daily training I wanted to fly every day. The concrete runway is too far from my home to get there every day and the Crown model, because of its retractable undercarriage, is unsuitable for takeoffs and landings on grass. I had to build another model. A model that could be hand-launched without an assistant and with slow landing speed. On the other hand I wanted a model with flying qualities of the Crown. It is obvious that to train the whole week with a slow model and to make two take-offs before a contest produces no results.

And moreover I did not want to use an expensive schneurle engine. That is why I used an engine of older series and I made a model a little bit smaller (in comparison with the Crown). When I discovered in R/C Sportsman magazine Mr Emplery's new profiles I chose profile EL 20 109. But then I had to face the problem of landing. So that the. model would not land on grass or short runways at a great speed I used wing flaps and electric wheel brakes to stop the model. Wing flaps make taking off easier, of course. Version C came into existence by using the training version of the Torrent and rebuilding its original wing. Now I present this model to the model building public in all its versions because I believe that many model builders have to face the same problems as .I do.

Building the Wing: We shall begin our constructing with the wing. First choose which of the Torrent versions you shall build. Accordingly, prepare the templates for the ribs. Templates are made from 3/32 plywood. For A and B versions use the symmetrical profile and for the C version profile EL 20 109. Ribs are made by so-called rasp interpolation. Screw 12 balsa 3/32 rectangulars between two plywood templates and sand them to shape. When unscrewed we shall have all of the ribs for one-half of the wing. Be sure you have ribs for right and left half of the wing. Then cut balsa wingspan W18 from 3/16 balsa..."

Supplementary file notes

Previous scan version.


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Torrent (oz14104) by Pavel Bosak 1979 - model pic

  • (oz14104)
    by Pavel Bosak
    from RC Sportsman
    February 1979 
    58in span
    IC R/C
    clean :)
    all formers complete :)
    got article :)
  • Submitted: 19/09/2022
    Filesize: 212KB
    Format: • PDFbitmap
    Credit*: dfritzke, theshadow
    Downloads: 552

Torrent (oz14104) by Pavel Bosak 1979 - pic 003.jpg
Torrent (oz14104) by Pavel Bosak 1979 - pic 004.jpg

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User comments

Thanks to bermas, can now credit the designer of this as Pavel Bosak.
SteveWMD - 01/10/2022
Design is indeed by Pavel Bosak. It was published on RC Sportsman on the date shown on the plan, which you already have included in the datafile. I believe the plan might be a little bit "under-scaled" as uploaded into Oz, as the span is supposed to be 58". Measuring the wheels, I come up with 2.1875", a very unusual size. Assuming they're supposed to be 2.25", if the plan is enlarged enough for the wheels to be correct, then the span comes up to 58"
RC Yeager - 01/10/2022
Have some photos now, with thanks to Pit, from online listing of the RC Sportsman magazine.
SteveWMD - 01/10/2022
Got it, wingspan 58 in. Many thanks.
SteveWMD - 01/10/2022
I think this plan do not come from the fullsize plan of RC Sportsman magazine that is very detailed for materials, but enlarged from a Czech magazine like Modelar or East German mag.
Pit - 01/10/2022
I believe you are correct Pit. The image from the AMA Plans search engine shows a bit more detail, and at least some basic identification of parts and sizes. But regardless, it was published in RCS.
RC Yeager - 01/10/2022
And of course, the AMA Plans site show the designer for this one as Carl Schmaedig - Lol. Will e-mail them pointing out the "bug" in the system.
RC Yeager - 01/10/2022
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