Pneumatic retractable landing gear Robart 605HD 90° Heavy Duty for RC airplane

Robart 605HD 90° Retractable Pneumatic Landing Gear for RC Airplane

The Robart 605HD pneumatic retractable landing gear is a Heavy Duty main gear designed for radio-controlled airplanes ranging from .60 to .120 size, especially warbirds and semi-scale models equipped with wing retractable gear. Its robust design and 3/16" (4.8mm) steel legs make it a suitable solution for RC models subjected to significant stresses during taxiing and landings. The 605HD model operates with a 90° retraction angle, making it particularly suitable for models where the main gear pivots perpendicularly to the wing to fit into the gear wells. The system is pneumatic and therefore requires a compressed air circuit with a reservoir and control valve.

Robart Retractable Gear for P-51, P-47, and Sea Fury

The Robart 605HD has been used on many large-scale RC warbirds, including the P-51 Mustang, P-47 Thunderbolt, and Hawker Sea Fury. Top Flite model instructions specifically mention the 605HD as an optional pneumatic equipment for these airplanes. For the Top Flite P-51D Mustang .60, the 605HD is specified with 3/16" wire legs, paired with the Robart 188VR pneumatic control system. The same setup is also intended for the P-47 Thunderbolt. The Top Flite Sea Fury .60 is another documented application. Its instructions include the Robart 605HD with 90° legs of 3/16", a Robart 188 pneumatic control system, and 4" main wheels depending on the chosen configuration.

Heavy Duty Design for Large-Scale RC Models

The Heavy Duty (HD) version is intended for modelers seeking more robustness than a standard mechanical retractable gear. The 4.8mm diameter steel legs allow for the use of large wheels and better support for the stresses generated by heavy models. The 605HD is also compatible with Robostruts from the 380 series, particularly the 653L and 653R oleo struts used on some P-51 configurations. Hangar 9 P-51 users have paired the 605HD with Robart 380 legs and 3.25" wheels, allowing for a more realistic configuration and improved shock absorption during landings, especially on grass runways.

Installation of the 605HD Pneumatic Retractable Gear

The pneumatic operation requires several additional components. For a complete installation, it is necessary to have a Robart 188 air control system, quick connectors, pneumatic tubing, an air reservoir, and a filling method. The pneumatic valve control is typically handled by a servo. Models equipped with the 605HD also require wheel axles suitable for the 3/16" legs. The 605HD is therefore a particularly suitable solution for building or renovating RC warbirds with retractable gear, when the airframe is designed to accommodate this type of mechanism.

Robart 605HD Features

Heavy Duty Pneumatic Main Retractable Landing Gear Robart 605HD Reference 90° Retraction Angle Set intended for main gear 3/16" / 4.8mm steel legs Pneumatic operation Reinforced Heavy Duty version Suitable for warbirds and RC semi-scale models Documented applications: P-51 Mustang, P-47 Thunderbolt, Sea Fury Compatible with certain Robostruts from the 380 series Compatible with large diameter wheels depending on the configuration Pneumatic valve control Robart 188/188VR control system recommended for installation Requires reservoir, tubing, connectors, and pneumatic control Destination: large-scale RC airplanes, warbirds, and .60 to .120 size models