In this episode of MasterClass Season 2, the hosts dive deeper into the ongoing restoration of the AT-6 Texan, focusing heavily on electronics safety, structural rehab, and strategically upgrading worn components. Between new show announcements and hands-on demonstrations, the episode delivers one of the most valuable lessons in RC airplane rebuilding: small details determine long-term reliability.
The Episode’s Biggest “Gotcha”: Unsafe Servo Extensions
While stripping the aircraft down, Joshua uncovered a serious—and all too common—problem: improperly soldered servo extensions. Not only were the solder joints weak, but the connectors had no strain relief, making them a major failure point inside a high-vibration warbird.
The episode strongly advises RC builders to never solder servo extensions. Instead, the team recommends using proper crimped connectors, which create secure, serviceable, and vibration-resistant joints. Good cable management also plays a role in safety, a recurring theme throughout the restoration.
Fueling, Pneumatics & Smart Hardware Choices
The Texan’s pneumatic system has been upgraded using Robart blue valves paired with medical-grade Luer fittings, creating a sealed system that eliminates leaks and reduces maintenance. This same strategy helped simplify landing gear repairs and remove unnecessary fittings that had been added over time.
Fueling upgrades also take center stage in this episode. Joshua showcases the DU-BRO Large Fueling Valve, explaining the differences between the glow-fuel version and the gasoline/diesel version—and why choosing the correct one matters for both safety and system longevity:
The episode also mentions that older valves can often be rebuilt, extending the life of classic hardware.
Control Surface Refresh: Hinges, Servos & Finishing
Several of the Texan’s surfaces, including the rudder and ailerons, were stripped, repainted, clear-coated, and fitted with fresh decals. During reassembly, worn hinges were replaced with DU-BRO Pin Hinges, a strong, dependable choice for warbirds with high-stress control surfaces:
This upgrade was paired with new Hitec servos (HS-485 HBS), giving the ailerons crisp, consistent response.
For related linkage improvements, Joshua also recommends DU-BRO Adjustable Control Horns, ideal for fine-tuning alignment and geometry on restored aircraft:
Cowl Issues, 3D Printing & Fiberglass Replacement
A custom 3D-printed cowl scoop was showcased earlier in the episode, bonded to the surface using Fix & Flex—a flexible, fuel-proof adhesive from Deluxe Materials. However, the cowl itself had deep cracks and structural issues. Rather than patch a compromised part, the team opted for a full replacement from Fiberglass Specialties.
Landing Gear Challenges: Twisted Frames & Failing Tubes
One of the retract units revealed a twisted steel frame, likely the result of a hard landing. With careful realignment, the gear was restored. Additional failures in the landing gear system—including excessive tubing joints and stretched pneumatic lines—were fixed by replacing all lines and using better-sealed fittings.
For securing small hardware during these repairs, Joshua makes frequent use of DU-BRO Socket Head Cap Screws, which are strong, clean, and resistant to stripping:
Final Takeaway
This MasterClass episode is a reminder that restoration is detective work. From identifying unsafe soldering to rebuilding landing gear, repainting components, and upgrading hardware, every step brings the Texan closer to safe, reliable flight. With thoughtful techniques—and durable DU-BRO components—the classic warbird continues its journey back to the skies.
