V-22 Osprey Build Update #4

May 01, 2012 No Comments by

After a break to concentrate on other projects, the Osprey has moved back to the front of the project queue.  This evening’s project was to install the spindle axles that allow the nacelles to pivot from vertical to horizontal orientation and to assemble the special servos that provide power for the transition.

First up is installing the spindles.  These are pre-drilled and tapped, so installation is simple.  Be sure to use blue Loctite.  The pot drive gear is part of the control feedback loop.

v-22_15_spindle

 

The pot holder assemblies provide the required external feedback loop to the conversion servos.  This is necessary because the conversion servos spin like a sail winch to move the nacelles through their full range of motion.  Be careful not to damage the fragile pots, and make certain the gears turn smoothly once installed.

v-22_16_feedback

 

The rack gears convert the rotation of the conversion servos to linear output to transition the nacelles from vertical (hover) to horizontal (cruise) configuration.  Here the reinforcement plates are being installed.  The screw heads must be fully recessed below the surface, or they’ll catch on the rollers on the backup arms (see next step).

v-22_17_racks

 

The backup arms are mounted on the conversion servos so that they can lock securely onto the rack gears.  It’s crucial that both nacelles pivot in sync.

v-22_18_backup_arms
This concludes the first chapter of the assembly manual.  On to chapter B!

 

 

Jim Ryan

About the author

A longtime contributor and the current "Heli Talk" columnist for Electric Flight, Jim has been heavily into aeromodeling for nearly 25 years. Electric warbirds are his main love, although in recent years helicopters have taken much of his attention. He is focused on scale helis and his favorite part of the hobby remains designing and scratch building.
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