Radio Roger (oz2125)


Radio Roger (oz2125) by Frank Ehling from American Modeler 1958 - plan thumbnail

About this Plan

Radio Roger. Single channel radio control gas model. Slab balsa sheet sides. Cub .075 diesel shown. From American Modeler April 1958. Article also includes drawings showing mods to use this as a CL model.

Quote: "Sleek, Realistic Beauty for Rudder-Only R/C Flying, Designed for the Novice. Radio Roger, by Frank Ehling.

There's no regulation, AMA or otherwise, which demands that radio control models must be big, clumsy, ugly monsters with little resemblance to a real plane! They can be small, realistic and scale-like and still be made in a short time by a novice with little or no previous R/C construction experience.

The ease with which this model flys has been demonstrated on several occasions when once it was airborne the transmitter was handed to an unknown bystander who with a little over-the-shoulder instruction turned in a good flight.

This model is not intended for com-petition flying (where a plane must be flown regardless of weather conditions), but it is easy to fly. Once you have familiarized yourself with its flight pat-tern wing incidence can be reduced and power upped by increasing engine dis-placement.

Construction: cut fuselage sides and bulkheads from sheet balsa. Assemble, using ample cement around firewall and nose sections. Carve nose cowl and wind-shield to conform with shape of nose section. Bend landing gear, attach to hardwood with J-bolts. Cement entire unit in place. Fuselage bottom is now covered.

Tail assembly is cut from sheet balsa to outline and sanded. Do not streamline these, merely round the edges. Slip stabilizer in place and cement. Rudder is cut and hinges applied, check to see that they work freely. Cement rudder atop stabilizer, be certain rudder is in line.

Escapement is installed. Check this for proper operation before fuselage top covering is applied.

Wing ribs are cut and assembled using plan for alignment. Cut trailing edge for taper as shown, trimming the bottom to obtain the wing's wash-out. Entire model is covered with silk. Covering over the balsa parts retards splitting.

Flying: start with enough power to enable the model to climb slowly off. Set rudder tab and make thrust adjust-ments to produce a straight-away flight. Use the radio initially to correct any descrepancy that may show up during the test flights.

After you have your model flying well and are sure your equipment is in good working order (we used the Aristo receiver and transmitter; it gave trouble free operation) hand the transmitter to some interested spectator (once the model has been airborne and reasonable altitude gained). Let him see how easy it is to fly and how little black magic there is in radio control. The last person we introduced to radio controlled flying this way is completing an Aero 9 and will soon have it ready for radio installation. We advised that she have her local hobby dealer help with the installation.

Yep, it's not hard to convince the ladies. It's even easier with a good-looking model!

Control line modifications: With the changes shown above 'Radio Roger' was flown as a control line model in a series of endurance tests. These showed the model to be an extremely able one from the standpoint of ruggedness; as a 2-line 'goat' the plane was extremely stable and easy to fly. "

Update 04/02/2019: Added article, thank to RFJ.

Supplementary file notes



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Radio Roger (oz2125) by Frank Ehling from American Modeler 1958 - model pic


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User comments

Mine was not all that successful, the very large fin combined with very low dihedral made it unstable. It had a tiny movable rudder which would turn the model, but once started into a turn, it was too slow to return to level flight. In combination with an escapement where you had to remember which direction was coming up next made it unflyable. My Fox 09 was about the right amount of power but control problems resulted in a short life. More dihedral and a bigger rudder plus a smaller fin would have cured it, however mine didn't last long enough to get it sorted out.....
DougSmith - 20/05/2015
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