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Cox Engine of The Month

"Pre-1956 Thermal Hopper -- cleaned and completely rebuilt."

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Post  jmendoza Sun Jul 23, 2017 12:55 pm

Here are some tips that will really help out the last version of the PT-19, made in China.

Remove the plastic flash using an emery board from the upper half of the clam shell hinge in the rudder, do the same for the fuselage . This ensures the elevator does not bind and flops down on it's own weight. Check the elevator for any flash that would cause it to bind as well.

The push rod is trapped under the bell-crank and binds, to fix that, remove the bell-crank screw and bell-crank. Remove the push rod wire and re-install it in the bell-crank so that the push rod sits on top of the bell crank. You need to have the push rod removed from the elevator to do this. Replace the push rod in the hole closest to the elevator for more control/stunt.

Perform the engine prep as I outlined in the engine forum under Sure-Start, be sure to orient the tank pick-up to the outside of the circle.

Remove any burrs from the wing lead out holes. Use a single length of Spiderwire (Spectra) to loop through the control handle and tie to the bell crank to obtain 42 foot lines. The Spiderwire is much lighter and thinner than the original Dacron lines and less drag.

With these few tweaks, the PT-19 is a blast to fly, and I run the engine at a clean 2-cycle to insure plenty of line tension and help it through loops.

Have fun! Jay

Bend up the ends of the wheel axles to prevent the sharp crimps on the axle ends from boring through the plastic hub of the wheel and coming off.
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Post  roddie Sun Jul 23, 2017 3:54 pm

Good stuff Jay! Thumbs Up Do you fly yours with the 6 x 2 "L/H" prop? I scored some of those props and some other OEM Cox parts when an old LHS closed nearby to me. The owner found them in a box in the back-room..  Shocked

PT-19 You-Fly tips Apple_10
PT-19 You-Fly tips 6_x_2_10

I'm on my 2nd PT-19 fuse.. and the fuel tank-bowl won't stay snapped-on/seated. I tried gluing.. but it wouldn't hold.

PT-19 You-Fly tips Pt19-t10
PT-19 You-Fly tips Fuel_t10

There's plenty of room inside the nose and behind the firewall for running a different type of tank.. so I'm not worried about it.

PT-19 You-Fly tips No_2_p10
PT-19 You-Fly tips 9-10-110

I bent-up new landing-gear-legs for mine.. (same .062" wire) and installed a pair of "Sig" 1/2A wheels (slightly larger 1.375" dia.) with Goldberg-style spring-collars. It helps a little with R.O.G. take-offs from a grass-field.

PT-19 You-Fly tips 1-11-110

OEM gear..

PT-19 You-Fly tips Wheels11

Replacement gear/wheels..

PT-19 You-Fly tips Wheels12
PT-19 You-Fly tips Pt19-s10

I've had a LOT of fun flying this model.. and will check for any mold-flashing at the stabilator.. as you suggested for smooth operation.

Thanks Jay! Thumbs Up

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Post  RknRusty Sun Jul 23, 2017 7:28 pm

Good tips, Jay. I'd like to add, the pushrod wire is awful thin on the PTs I've had. Consider using a thicker piece of music wire that has less flex. Or go all out and make a CF tubular pushrod.

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