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Old 12-29-2016, 02:53 AM   #401
Atomic Skull
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I have a suggestion, how about a 3D printed tail hub? Instead of a solid hub it could be a teetering tail like the Goblin 380 uses. The hub block would have a hole in it that the shaft is pressed/glued into and there would be a common spindle and dampers like a main rotor head. Because the tail spindle floats on rubber dampers it reduces the strain on the tail. Most implementations of this style of tail also have some delta-3 to correct for dissymmetry of lift in the tail rotor which further reduces stress on the tail hub and bearings (SAB uses something like a 15 degree offset on the tail grip links). Note also that this type of tail requires link balls on the tail grips because the grips and spindle must be able to teeter slightly which isn't compatible with links that are restricted to being parallel with the tail grips and slider.

In addition to the performance improvement this type of tail allows for some bearing preload to be designed into the grips because the dampers can be compressed slightly which yields tight stop free tail grips.
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Old 01-09-2017, 10:08 PM   #402
prototype3a
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Anyone use 3dHubs for their parts? How much do the parts from ShapeWays cost?

Looks like about $100 in parts on 3dHubs.
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Old 01-31-2017, 04:00 PM   #403
ben_beyer
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What else is new with this project?
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Old 03-10-2017, 08:13 PM   #404
crf69
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very cool little machine!!
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