GREAT PLANES Waco YMF-5, Instruction Manual

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11. Fit two 3/16" [4.8mm] wheel collars onto the elevator 

pushrod wires. Use a drop of thread locking compound on 
the screw threads and fit two 6-32 x 1/4" SHCS. With both 
elevators centered, tighten the collar locking screws to hold 
the two wires together securely.

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12. Mark the pushrod at the servo arm and make a 90° 

vertical bend. Drill the second outermost servo arm hole 
using a 5/64" [2mm] drill. Fit the pushrod to the servo arm. 
Secure the pushrod with a nylon Faslink. Cut off the excess 
pushrod wire. Install the servo arm screw.

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13. If you need to make any minor adjustments to the 

elevators, make the adjustments at the individual elevator 
clevises rather than at the collars. Remember to secure 
the clevises with the silicone retainers when you are done 
making adjustments.

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14. Use a 1/16" [1.6mm] drill bit to install the rudder servo 

so that the outermost hole in the servo arm is aligned with the 
rudder pushrod wire as shown. 

Note:

 The servo arm must 

be positioned on the output shaft so that there is a 90° bend 
between the arm centerline and the pushrod. Choose the 
servo arm that aligns best and clip off the remaining servo 
arms. Remember to harden the screw holes with thin CA.

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15. Mark the rudder pushrod at the servo arm hole and 

make a 90° bend. Drill a 5/64" [2mm] hole. Install the pushrod 
on the servo arm and secure it with a nylon Faslink. Cut off 
the excess pushrod wire. Install the servo arm screw.

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16. Make any adjustments to the pushrod length to center 

the rudder and re-secure the clevis with the silicone retainer.

GLOW ENGINE INSTALLATION

This section will cover the installation of an O.S. FS-1.20S-E 
Surpass four-stroke glow engine. A two-stroke .91 sized 
engine can be installed with a Pitts-style muffler. If you 
are installing a different engine, please respect the firewall 
to prop washer dimension of 6-11/16" [170mm]. Plywood 
spacers are included that work with the two bolt patterns 
etched on the firewall. This engine is best mounted with the 
cylinder on the right side and the exhaust facing down.

Mount the Engine

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1. To install the O.S. FS-1.20S-E Surpass four-stroke 

glow engine (or any engine using the supplied nylon engine 
mount), drill the firewall at the four engraved “+” marks on the 
firewall using a 3/16" [4.8mm] drill. These marks line up with 
the two nylon engine mount halves that are supplied in this 
kit. If you plan on using a different engine mount, please use 
the vertical and horizontal centerline “crosshair” marks on 
the firewall to line up the template that came with your mount.