I made a fake Cox airplane

Nice work, latole. I bet if you were to add a fuel tank, install a CL bellcrank with lead out wires and pushrod system to revised moveable elevator, it would probably be a decent flyer as well.

Thank you.
I think about that. I also need 2 hinges, elevator mods is not a easy job

Or for free flight ?

Free flight would not be a good choice. It lacks sufficient wing area, is too heavy for existing wing area, and it would be unstable without sufficient wing dihedral. If it were say, molded out of lighter weight foam, even then, the wing area is too small for even a .020 Cox Pee Wee.

For example, for .049 power under radio control, Joe Wagner enlarged his 24" wingspan Dakota cabin free flight (suitable if properly built for .020 PeeWee) to 30", renaming it to Osprey. Below, I show you the Dakota plan versus the Osprey. If you will even notice, the Dakota has greater wing area than your otherwise excellent adapted biplane. It was for an earlier version OK Cub .049, whose power then was may be a touch more than the .020 Pee Wee, but definitely less than any Cox .049 engine.

(The .049 Coxes debuted almost a decade later. Over time, the OK's improved power wise, too, but Cox was always the more powerful engine. This is why the OK Cubs became non-competitive sometime in the early 1960's. Leroy Cox had basically outdone all other manufacturers with his revolutionary mass machining techniques with tighter tolerances, plus excellent designs, providing more powerful engines at a cheaper price.)

Outerzone Plan# oz233 - 24in 1947 Veco Dakota by Joe Wagner



Outerzone Plan# oz7191 - 30in 1988 Osprey by Joe Wagner



Thus, the best use of your creation would be flown as control line.

Actually, only one half of the elevator needs to be controllable for fun. It would be easiest to do that way. Leave the other half straight. The late Walt Musciano did that on a couple of his half-A CL aircraft, to simplify the linkage for the neophyte builder. One was the flying wing Navy jet plane of the late 1940's into the 1950's, the Cutlass.

GallopingGhostler wrote:Actually, only one half of the elevator needs to be controllable for fun. It would be easiest to do that way. Leave the other half straight. The late Walt Musciano did that on a couple of his half-A CL aircraft, to simplify the linkage for the neophyte builder. One was the flying wing Navy jet plane of the late 1940's into the 1950's, the Cutlass.

I need only half of the elevator working !
That's good news , thank you

I only need hinge and elevator control horn, bellcrack and push rod and gas tank.
And many hours of work / fun........

GallopingGhostler wrote:Free flight would not be a good choice. It lacks sufficient wing area, is too heavy for existing wing area, and it would be unstable without sufficient wing dihedral. If it were say, molded out of lighter weight foam, even then, the wing area is too small for even a .020 Cox Pee Wee.



Thus, the best use of your creation would be flown as control line.

Thank you for those good informations.

I'm joking about free flight, I won't do with any plane.
I don't want to loose it or crash it.

latole wrote:I need only half of the elevator working ! That's good news , thank you. I only need hinge and elevator control horn, bellcrack and push rod and gas tank. And many hours of work / fun........

I think you will have your own engineered design for this single elevator control system in very short order, and you are right, this is fun work. I did similar some 50 years ago while in high school. I bought from a tent sale at a local Gem department store in Hawaii, a new Cox .049 ready to fly P-51A control line aircraft. It was missing the box, moveable elevator and bottom shell of the fuselage. It was being sold for parts, but otherwise complete with engine and propeller, I paid $1.50 for it plus $0.06 sales tax. (Then in 1972, sales tax was only 4%.)

At home, I figured my new control system. From the existing bellcrank, I made a new elevator out of 1/16" (1.6mm) thick balsa, joining both halves with music wire, fastening it with cloth hinges. I cut a narrow slot in the fuselage and ran a new music wire pushrod from its internal factory bellcrank to a new half-A control horn on the elevator.

I also made a squared off fuselage bottom out of 1/16" balsa, glued it in place. To keep things simple, I did not made the scale under-belly radiator. After sealing the balsa grain with Pactra sanding sealer, I painted the balsa parts with Pactra Olive Drab dope. I was very proud of my work, but it fell victim to my parents liquidating my things when I left the house for joining the Army in Summer 1972 after my high school graduation.

Anyway, back to your situation. Here is a plan view of the 15" (410mm) wingspan Scientific, U.S. Navy Chance Vought F7U Cutlass C/L kit designed by the late Walt Musciano, a then famous American model aircraft designer. As you will see, it only used one half as the non-scale elevator. (Scientific discontinued model aircraft kit production in the mid 1970's, but after in the 2000's up to recently (I don't know if this still continue this tradition), the modeling community followers held annual "hollow log contests" of his C/L half-A aircraft designs that used a carved balsa fuselage (known as the "hollow log") out of a block of balsa.





Outerzone Plan# oz3558 - 15in 1960 Scientific Chance Vought F7U Cutlass by Walt Musciano

Thank you GallopingGhostler , very useful informations.