Bill of Material 1343

Another Alternative Method of Manufacturing of Elastomer: Just an idea

• Dip the torque tube, with the root end at the bottom, down into a tube filled with an elastomeric liquid.
• Then withdraw the coated torque tube and allow curing.
• Repeat the above a number of times.
• Assuming that the temperature of the, torque tube. liquid elastomeric and curing air are controlled. The liquid elastomeric might flow down the torque tube thereby causing the 'wall thickness' of the elastomeric to be greater at the root end then at the tip end; as desired.

• Female mold. see; MAKE: Special Tool ~ Rotor - Blade - Elastomeric Female Mold

1. Hold the female mold vertically with the root end up.
2. Pour in a given amount of liquid elastomer (and perhaps hardener).
3. Insert the torque Tube down into the liquid elastomer until it 'bottoms out' and is located laterally by the pins in the 3-part female mold.
4. Cure.
5. Remove the 3-part female mold.
6. Fill the pin holes, left by the female mold with elastomer.
7. Cure.

1. Create a circular elastomer sheet that has a x" OD, a X" ID and is 1/8" thick.
2. The inner area of the sheet may have a very stiff elastomer and the outer portion have a very fluid elastomer. Or, the elastomer may be tapered thicker at the OD than at the ID.
3. Spiral cut at a width of X"

1. Produce an elastomeric tube with, tapered OD, tapered wall thickness, and tapered ID. Somehow.

1. Apply a bonding agent to the torque tube.
2. Spiral wrap the elastomer over the complete area of the torque tube.

1. Turn the tapered elastomeric tube inside out.
2. Apply a bonding agent to the torque tube.
3. Roll the narrow end of the elastomer inward for about 1'.
4. Slide the narrow end of the elastomeric onto the narrow end of the torque tube to the correct position.
5. Roll the elastomeric (outside to inside) on to the torque tube and hope like hell that the large end ends up in the correct location.

1. The elastomer must be thick at the root end to accept +12º to -12º twist, but the torque tube should have as large diameter as possible to handle the torque. Perhaps the wall thickness can be less at the tip end.

• 3" diameter x 8'-0" high tube that is sealed at bottom.
• Tube to be partially filled with a light weigh highly elastic liquid rubber.
• Torque tube has large diameter end sealed and a few inches of the OD at this end are protected from the elastomer.
• Torque tube is dipped down into liquid rubber until all is exposed into the rubber except 3-5" at tip end.
• Repeat the dipping but each time dip down a few inches less than the previous time.
• When finished, the root end will have a thicker coating than the tip end. Therefore the amount of torque transmitted from the torque tube to the spar will be minimal at the root and increase when moving out the span to the tip.

• DESIGN: UniCopter ~ Rotor - Blade - NACA 00xx - Elastomeric Active Twist Bearing

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