Junior Telemaster (oz9390)

 

Junior Telemaster (oz9390) by J Martin 1978 - plan thumbnail

About this Plan

Junior Telemaster. Radio control sport trainer model for .09 to .19 power. Wingspan 48-1/4, wing area 400 sq in. Discontinued kit plan from Hobby Lobby.

Quote: "Junior Telemaster Building Notes.

Building the Wing. Because the Jr has a flat bottom wing, the wing panels are built right over the plans. Since the entire wing plan is provided, both of the wing panels are built at the same time. The right and left wing panels are not glued together however, until the center tapered section is added to build in the proper dihedral.

With the plans covered with wax paper and fastened to a flat building board, pin down and glue the leading edges, bottom leading edge sheeting, bottom trailing edge sheeting bottom center section sheeting and bottom cap stripping. Apply glue to the length of the lower wing spar and position on the bottom leading edge sheeting using tip and root ribs as locating jigs and pin securely in place. Glue all ribs in position followed by gluing on the trailing edge and top wing spar pieces. Carefully bevel the top of the trailing edge to conform to the wing airfoil. Now glue and install the top trailing edge sheeting, top leading edge sheeting,top center section sheeting and top cap stripping. Note that the outside edge of the tip rib cap stripping should be flush with the outside face of the tip ribs.

Remove both wing panels from the building board and using a flat sanding block, sand the face of the tip and root ribs and sheeting flush. Glue the triangular tip blocks place, positioning the bottom edge of triangle stock even with the bottom edge of the tip rib bottom cap stripping.

Use epoxy to glue the tapered stock to the root rib on one wing panel. The thicker edge should be toward the bottom side of the wing panel and aligned with the bottom edge of the rib. Then cut and sand the top edge of the tapered stock to the rib contour. Using 5 minute epoxy, glue both wing panels together. Make sure that the leading and trailing edge of the wing panels are properly aligned.

Sand the leading edge to the shape as shown on the wing side view. As the wing tips are sanded to the wing contour they will automatically achieve the proper curve as shown on the plans top view. Use 3-4 oz glass cloth and resin to rein-force the top and bottom sides of the wing center section.

Mark the bottom side of the aileron stock and cut the ailerons to the proper length. Drill the hole for the aileron torque rod in the leading edge of each aileron and sand the tip end to the proper shape... "

Plan includes hand-traced formers, with notes.

Update 11/04/2020: Added kit review from Flying Models June 1978, thanks to RFJ.

Quote: "An FM Product Review: Hobby Lobby's Junior Telemaster eginners Outfit. Hobby Lobby answers the question of how to get started in R/C with a total approach aimed at the novice. A package of things that work well. By Ron Farkas.

The subject of this FM Product Review is a complete beginner's package from Hobby Lobby International Inc, Rte 3, Franklin Pike Circle, Brentwood, Tennes-see 37027. The package includes a Jr Telemaster kit, Fox .15 R/C engine, Hobby Lobby six channel radio and two rolls of Superkote covering material. Except for the Fox engine, these items are marketed exclusively by Hobby Lobby. At the time this review was started, the special package price was a very reasonable $277. These items have all proved to be of high quality and perform very well together. And best of all, this combination is ideally suited to someone who is just starting out in radio control airplanes.

The Jr Telemaster is a trainer designed to take the novice from first flight through competence in four channel flying. It is equally suitable to three channel operation (no ailerons). This is one trainer that really does the job well. As you might imagine, there are some kits which are marketed as trainers but don't fly so well at all. How can a beginner make a choice based on advertising claims alone? This is risky and, whenever possible, he should seek the advice of an experienced flyer (and read lots of prod-uct reviews).

Unfortunately there are varying opinions as to what makes a good trainer, and each instructor may make a different recommendation based on his experience. In fact, one could fill a book on the subject of trainers alone, and that would still not settle all ofthe controvery. So to put this review into perspective, I'll tell you a little about my feelings on trainers. Later on you will understand why I like the Jr Telemaster so much.

The following discussion is grossly over-simplified. There appear to be two major categories oftrainer: 1) super stable so that it almost flies by itself, and 2) reasonably stable so that it requires attention but is forgiving of errors. I find that the first type tend to be sluggish and very hard to manage in the wind, but the second type are more responsive and more tolerant of windy conditions. If you live in a windy area, you aren't going to learn how to fly by waiting around on the ground. Also, to some extent, excessive stability robs the student of valuable learning experience. So for most beginners I will recommend a ship in the second category pro-viding it has no bad habits.

What all of this is leading up to is that I think the Jr Telemaster is an ideal type-2 trainer. With or without ailerons it responds positively to the controls and goes where you point it even in moderate winds. The controls are effective down to the stall point, which is gentle and occurs at a very low speed. It is moderate in size for economy and ease of transportation, yet has plenty of room for radio equipment. Also, it is strong without being heavy or difficult to build. So let's see how it goes together.

The box is deceptively small for a ship that builds up to a 50 in span and 409 square inch wing area. The wood is all clear and straight, and all the pieces were of suitable density for their respective applications. Only the 1/16 fuselage top and bottom sheeting was a little too soft by my standards. The hardware includes machine screws, blind nuts, aileron torque rods, horns, landing gear, tailwheel gear, and a Bridi BHE-19 fiber-filled engine mount. The plans are clear and easy to understand, especially because of the simplicity of the design. The instructions are brief but anything that may be vague can be figured out from the plan. There is a bill of materials which is worth checking before you begin. The only piece that I could not account for was the capstrip material which I easily cut from some stock in my scrap pile.

Assembly goes very quickly, especially because the parts fit perfectly. The flat-bottomed wing is built in two pieces on any straight board. The bottom sheeting, capstrips, leading edge and spare are glued together over the plan. The bandsawed ribs are glued down followed by the top spar, trailing edge, top sheeting and capstrips. The wing panels can then be removed from the board and aileron torque rods fitted. The instructions are sketchy in this area. Hardwood tapered stock is pre-notched to take the torque rods and all you have to do is glue this assembly to the trailing edge of the wing (without getting glue in the guide tube, of course). I always add a little scrap material in the trailing edge of the wing to give the aileron hinges something to bite into.

The tips are glued on and carved, and the wings are ready to join. A center rib of tapered stock is used to ensure that the dihedral is built in. The instructions specify the application of glass cloth to strengthen the center section. I think this material should be included so the builder is not inclined to omit this important step. The completed wing is very strong and resistant to twisting..."

Supplementary file notes

Instructions. 5 pages inc bill of materials.
Review.

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Junior Telemaster (oz9390) by J Martin 1978 - model pic

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