Where can I find an .stl file to plug a printed part onto a Parallax CR Servo?
AwesomeCronk
Posts: 1,055
in Accessories
Is the servo head connector universal? I am wanting to make a paddlewheel to put on a boat.
Comments
How big do you need it to be?
Do you want it to look like this one: Paddle Wheel
Mike
A Google search for "Futaba spline .stl" brings up a lot of hits.
Thanks! I think I may have found sort of what I want. It will take some tweaking, though.
@iseries
I need to get onto my computer and check how deep the hull rides in the water. Can I have a look at your spline print?
EDIT: After getting the document loaded, I have found that I need a 80mm diameter paddlewheel. I also need a shaft extruding from the center on one side, 12mm long, 6-8mm diameter. If I can just get ahold of the portion connecting to the servo head, I can take care of the rest in FreeCAD.
In any case, I have decided to use this one.
EDIT: Added a picture of the paddlewheel, which has a 5 inch diameter.
Here's a video of my initial prototype:
[video]
A couple suggestions: we found that the fewer paddles the paddlewheel had, the better. Most students made theirs with three or four. (You can see how slow mine went at full speed in the video. I think the paddles interfered with each other, creating drag due to cavitation.) Also, adding a tail fin helped to stabilize the craft and made it easier to steer.
Since the race was held in saltwater, the servos, the receiver, and the battery were sealed in a watertight box with glands on either side for the paddlewheel shafts. This also allowed for reduction gearing inside the box. If you're running it in freshwater, this might not be such a big factor, but be prepared for everything to get wet!
Be sure to post a video of your craft in the water.
Have fun, and good luck!
-Phil
https://openlibrary.org/books/OL6242487M/Hydrodynamics_in_ship_design.
After choosing your preferred download format and grabbing a copy, go to page 638: "The Design of Miscellaneous Propulsion Devices"
Hope it helps a bit.
Henrique
Here is the finished fore hull.