Printing some streamlining bits..

 Acroduster  Comments Off on Printing some streamlining bits..
Aug 102019
 

Given that it is difficult to find the right size streamline tubing, I better go ahead an make some. With the open-scad script I found I made a handful test pieces. The idea at the moment is to attach the plastic with a layer or 2 of 25 gram glass cloth. That should fill the little grooves in the printing and provide enough strength. Obviously this has to be done after the brazing.

I also tested the deflection in the motor mount once it is attached to the frame. Can’t move it. This is a comforting thought.

not moving..

Streamline tubing

 Acroduster  Comments Off on Streamline tubing
Aug 072019
 

I did say undercarriage? A whole new can of worms just opened. I had hoped to be able to use a normal streamline tube as offered by various vendors. However, can’t find anything close enough to what I want.

I could make my own from round tube, just like friend Achim , but that’s a major effort. Many say that deforming a round tube introduces cracks, and therefore failure waiting to happen. Don’t need that.

How about adding some plastic and cover with some glass, a bit of sanding and no one will see? Time for a 3D print job.

A quick search for airfoil scad scripts turn up something useful. This is the first idea. Ideally there should not be a round nose, but given the rather short length of tubing and the ample power of the engine, I think I can forget about the added drag of not having a perfect airfoil shape.

Most streamline tubing has a more rounded TE, we need to fix that!

So this would be glued to the back of a round tube. I’m sure it will look right 😉