Welcome To Dundee Model Aircraft Club

1. Check clevis to control surface attachments.
   • Check that the clevises (or ball joints) for each control surface are securely clipped into it's appropriate control horn and are secured to stop accidental opening. To find out how to do this, see Fail Deadly . Checks are required for the throttle, ailerons, elevator and rudder (as well as any other function such as retractable undercarriage or flaps).
   • Where intermediate threaded links are fitted - common with snake type push rods - ensure that the clevises are screwed on sufficiently to allow the threaded portion to be seen through the clevis threaded end.
   • Ensure that the clevises cannot "jump" threads when direct force is appled to the clevis/ threaded section. Down at the size of the threads commonly used for this function, U.S. and metric threads can be interchanged - ie. you can screw a metric clevis onto a U.S. thread but it is not secure.
   • Where screw clamp arrangements are fitted, check that the standard (or grub) screw is tightened fully and that the clamping mechanism does not slide on the pushrod.
     
     
2. Check clevis to servo attachments.
   • Check that the clevises (or ball joints) for each servo are securely clipped into it's appropriate control horn and are secured to stop accidental opening. To find out how to do this, see Fail Deadly . Checks are required for the throttle, ailerons, elevator and rudder (as well as any other function such as retractable undercarriage or flaps).
   • Where intermediate threaded links are fitted - common with snake type push rods - ensure that the clevises are screwed on sufficiently to allow the threaded portion to be seen through the clevis threaded end.
   • Ensure that the clevises cannot "jump" threads when direct force is appled to the clevis/ threaded section. Down at the size of the threads commonly used for this function, U.S. and metric threads can be interchanged - ie. you can screw a metric clevis onto a U.S. thread but it is not secure.
   • Where screw clamp arrangements are fitted, check that the standard (or grub) screw is tightened fully and that the clamping mechanism does not slide on the pushrod.
     
     
3. Check pushrods.
   • Where snake type pushrods are used, the outer of the pushrod must be securely fixed to a rigid structure.
   • Where snake type pushrods are used, ensure that the threaded attachment (which connects to the clevis) is screwed at least 5mm (3/16") into the pushrod and that it cannot be pulled out.
   • Where rigid (balsa or spruce) conventional pushrods are fitted, the metal attachments for the clevises (usually bicycle spokes) should be glued and bound to the pushrod. No movement is permissible at the joins
   • Where screw clamp arrangements are fitted, esure that only about 3mm (1/8") of the pushrod protrudes beyond the clamping mechanism. This ensures that they cannot foul any other controls, leads etc.
     
     
     

     If you have disconnected any linkages while carrying out this check ensure that all linkages are reconnected and properly secured.

     Now, in turn, disconnect each control servo horn from it's servo and move the control pushrod backwards and forwards. Each linkage should be free to move with no binding or "hard" spots. Re-connect each servo arm, remembering to fit and tighten the servo arm screw.

Set Up
Controls Fuselage Radio 1 Engine Undercarriage Wings Linkages Radio 2 Assembly Last Checks And Finally