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Good Information from Messages

Learning to Fly Control-line Model Airplanes

Learning to fly control-line model airplanes is not as simple as one might think. Over controlling is a common problem with beginners; on takeoff too much up control is used causing the plane to zoom skyward at an impossible angle, the natural reflex is to apply down-elevator, but too much is applied which starts a succession of up and down gyrations that can end with an abrupt meeting with the ground. One technique that works well for beginners, is to keep your hand rigid and only move the arm up and down while keeping your elbow and wrist rigid.

Further complicating the flight of the control-line model is the fact that sufficient centrifugal force must be maintained to keep the tension needed to control the models up and down movement. This is especially true when the model is flying on the upwind portion of the circle, where the wind will be pushing the model inward slackening the lines.

There are techniques to cause the model to fly outward at all times. Most common is having the rudder turned so as to direct the model outward. Another technique is to have the engine thrust line titled outward. Sometimes weight is put in the tip of the right wing.

Any Ideas on Making the Learning Easier

In teaching beginners, I find they just can not seem to get over controlling. I have thought of putting stops on the bellcrank so as to allow little up and almost no down. If anyone has any ideas, please e-mail.


Beginners do best if someone helps them with the first couple of flights, either with a trainer type handle, or simply holding a hand over theirs.

The plane should be a trainer type- nose heavy, realtively large tail, mechanically very slow controls. Use the innermost hole on the bellcrank, a tall control horn, and a large bellcrank, so everything is set up to require the most movement of the handle to get from full up to full down. If the plane can manage a loop, it is probably set up too sensitive.

Phil               ______________________________________________________________





Buena Información Extraída de Mensajes

Aprendiendo a Volar Control-line

Aprender a volar modelos de aviones de control-line no es tan fácil como parece. La tendencia de aplicar demasiado control es un problema muy común entre los principiantes. En el despegue del modelo, el aplicar demasiado control hacia arriba causa que el avión suba a un ángulo exagerado y dificil de controlar. La reacción natural es aplicar (demasiado) control hacia abajo causando una serie de subidas y bajadas exageradas terminando en un encuentro abrupto con la tierra.  La técnica recomendada es mantener la muñeca y el codo rígidos y simplemente usar el brazo hacia arriba y abajo.

Otro factor que complica el vuelo circular es la necesidad de crear suficiente fuerza centrífuga y tensión en los cables para mantener el modelo tirando hacia afuera del círculo. Generalmente se usa el timón inclinado unos pocos grados para dirigir el avión hacia afuera del círculo. Otra técnica es instalar el motor de manera que la línea de fuerza apunte uno ó dos grados hacia afuera del círculo. Es necesario también añadir suficiente peso en la punta del ala de afuera (opuesta al ala donde salen los cables)  para contrapesar la carga y arrastre de las lineas ó cables.

Ideas para Facilitar el Aprendizaje

1. Balancear el modelo de manera que el punto de balance esté hacia el frente al centro de balance recomendado por el diseño (más pesado de nariz) lo hace menos sensitivo a los controles.
2. Usar un modelo (resistente a golpes y poco sensitivo en los controles) diseñado para el aprendizaje.
3. Usar un piloto de experiencia como instructor para el primer vuelo. Una técnica es poner la mano del instructor sobre la del principiante para evitar la aplicación de control excesivo. El uso de un doble mango de control ha probado ser muy efectivo para estos propósitos.
4. Limitar el movimiento de la pieza de pivote (bellcrank) en los controles para que  permita poco movimiento hacia arriba y casi ninguno hacia abajo.


Es conveniente para principianes que reciban ayuda de alguien con experiencia en control-line para los primeros vuelos.

El modelo debe ser diseñado para entrenamiento: pesado de nariz, con una cola grande y mecánicamente lento en sensitividad de control. Se recomienda que se use el agujero más cerca del centro en la pieza de pivote (bellcrank), el brazo de control de la cola y la pieza de pivote deben ser de tamaño grande ajustados para que se tome el máximo movimiento del mango de control conseguir el máximo movimiento del elevador. Si el modelo es capaz de completar un vuelta en rizo (loop) está muy sensitivo para aprender a volar.










     English -









(Fully Aerobatic Tanks)

CREDIT: Nils Norland article on Plastic Uni-flow Tanks


Since plastic clunk fuel tanks have become an accessory of preference among many control-liners and since uniflow fuel tanks have proven to be most effective in control-line precision aerobatics, the following information tells you how to combine both.

To prepare a plastic clunk tank for uniflow:

1. Bore out the third hole in the rubber stopper for the line to be used as vent and mount the stopper so that looking at it from the front the vent hole is up on top, the fuel line should be outboard on the bottom and the uniflow line inboard on the bottom. Copper or brass tubing is normally used for the vent line and for any line that needs bending inside or outside the stopper. For slanted front tanks it is better to use copper or brass for all three lines. The fuel and uniflow tubes inside the tank must be bent so that they are parallel with the top and bottom of the tank.  For tanks with the stopper coming straight out the front, the much lighter hard plastic tubing that comes with the tank kit may be used for the two lines that do not need bending.


2. Assemble the clunk line with the clunk nipple just long enough to reach the outside rear of the tank without actually touching it. The uniflow line comes off the other tube and ends right at the end of the other line where it stops on the clunk nipple. Insert a copper eyelet in the end of the uniflow line. Two reasons for the eyelet: one, it can be adjusted in and out to fine tune the break on the engine run and two, it gives the shrink tubing something to grab without squeezing the uniflow line.


3. Slide of piece of shrink tubing over both lines so that it is flush with the end of the uniflow at the exposed front end of the clunk. You may use a heat gun to stick both lines and the shrink tubing together tightly.

4. Mount the tank with the centerline slightly (3/16" to 1/4") above the needle valve assembly, just like a metal tank.

5.  The uniflow intake line should not be covered and should face forward into the airstream just like a metal tank. The uniflow intake is also the fueling line.  Plug the vent (overflow) line after fueling.

6. To obtain proper engine run and breaks you may need to make further fine adjustments by moving the tank up or down or changing the length of the uniflow line by moving the eyelet in or out.


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