V-22 Osprey Build Update #3

Nov 23, 2011 1 Comment by

This evening’s task is assembly the frames for each nacelle.  If you’ve built a couple of non-ARF helicopters in the past there won’t be any real surprises here, but definitely follow the instructions as the Osprey doesn’t function like a normal heli.

A note of clarification:  One tends to look at the nacelles in their horizontal (cruise flight) orientation, but as the instructions note, you should look at them in the vertical (hovering) orientation, as all notations in the instructions are based on that.

The instructions show how to tell the inner left, outer left, inner right and outer right nacelle frames apart.  There is one of each, so make sure you can tell which is which.  Loosely assemble the left nacelle, using blue Loctite on all threaded fasteners.  Leave all screws loose until you install the main shaft, and only then tighten them.  In this way the main shaft can act as an alignment jig to assure all bearing blocks are perfectly aligned.

v-22_10_nacelle

Next the ball links are installed on the control arms.  These arms link the servos to the swashplates.  They install nearly against the nacelle frames, so be sure and grind the ball link screws flush with their backs if necessary.

v-22_11_ctrl_arm1
Flanged bearings are inserted into the nacelle frames for the control arm mounting rods.  These should be a press fit.  If they’re too loose VERY carefully CA them into place.  Mine fit perfectly – snug but not too tight.

v-22_12_ctrl_arm2

The narrow nacelles of the Osprey require a two-stage gear train for the main shafts, so the lash between the two gears has to be set before installing the motors.  Take your time to get this just right.

v-22_13_gears

Finally the previously-assembled swash plates, swash drivers and rotor heads are installed.  If you squint a little, it’s starting to look like an Osprey!

v-22_14_nacelles

This is pretty good progress for two relaxing evenings of work.  Next up will be setting up the conversion mechanisms for transitioning the nacelles from hovering to high-speed flight.

 

Jim Ryan, Uncategorized

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.

One Response to “V-22 Osprey Build Update #3”

  1. Gary Vinock says:

    Is this a kit that can be purchased or a sratch built project of your own? Im considering trying to build a v-22 osprey and any information you could provide would be greatly appreciated. If you knew where to get or have airframe plans that would be great.

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