To add the optional flap servos, a reversing Y harness will be needed, or purchase 1 standard ST47 servo and 1 reversed ST47 servo. The required radio equipment to install the optional flaps would be as listed:
2 - JSP20050 SERVO, STANDARD, ST47
1 - EXRA320 Y HARNESS 6"/REVERSER STANDARD
1 - JSP20050 SERVO, STANDARD, ST47
1 - JSP20050R REVERSE SERVO JP20050 (ST47)
1 - JSP98020 Y-HARNESS, STANDARD 6"
If you have any further questions, please contact our product support team for further assistance. You can call us at our toll free number at 877-504-0233 or email at firstname.lastname@example.org.