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model builderPark Pilot


Installing surface controls


Jeff Troy jefftroy@aol.com


>>


In a previous installment, I discussed how to


remove any sagging in fi lm covering and how to ensure that it’s securely attached to any underlying structure. Now that the covering is smooth and tight, my Paulistinha P-56’s assembly can begin. To keep CA hinges


centered during the control- surface attachment, try inserting one hinge at a time approximately halfway into the control surface then adding the tiniest drop of thin CA adhesive to hold each hinge where you want it. I use Bob Smith Industries (BSI; bsi-inc.com) Super- Gold Odorless Foam-Safe CA with a BSI #302 ExtraFine


Extender Tip to prevent excess CA from getting onto the hinges. With each hinge tacked in its center position, you can join the control surfaces without disturbing these midpoints. After each control surface is fi tted correctly,


ensure a secure, but fl exible, bond by turning the wing upside down, defl ecting the aileron to full up, and applying two drops of thin CA to each hinge. After the CA has set, turn the wing right side up, defl ect the aileron to full down, and


repeat the CA application. In a few minutes, you can repeatedly fl ex the aileron up and down to test the connection and relax the hinges. The Paulistinha’s aileron servo covers are made of plastic and are factory


Insert the hinges to the halfway point then apply a tiny drop of thin CA adhesive to each hinge to keep them centered when you fit the aileron to the trailing edge.


46 PARK PILOT [Summer 2018]


The Paulistinha P-56 kit includes three sizes of aileron servo mounts to accommodate the different suitable servos. I use thin CA adhesive to attach the correct mounts to the plastic servo covers.


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