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Part II "The Rotor Head"
By: Rotor_1
In this second installment I'll explain how I built a four bladed rotor head for my OH-6A.
To keep the construction as simple as possible, I built the head out of 1/8" thick aircraft grade plywood stacked three layers thick.
I started out drawing three crosses on the plywood, each line making up the cross measured 4 1/4" long. I then drew a 1 7/8" diameter circle starting from the center of each cross. This layout should help to explain it clearly.
Using the original head as a templet, I traced the outline of one of the blade grips onto a piece of thin cardboard creating a blade grip templet. This templet was then used to transfer the shape of each blade grip to the first layout. This diagram shows the results.
Using a small jig saw, I cut out each piece. After each piece (layer) was cutout, I stacked the three pieces together and sanded the edges so they where all the exactly the same shape. One of the head layer pieces was modified by cutting off the blade grip section as shown here.
This photo shows the actual pieces all cutout.
Once all stacked, they should look like this.
The rotor blade fits into the blade grip perfectly as seen in this photo.
The small rods under each blade grip where made from wooden dowels and glued in place. The base of the head assembly was cut from the same 1/8" ply.
I attached the blades to blade grips the same
way I corrected the sagging rotor blade problem.
