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Archive for March, 2013
Posted by scott page | Mar 31, 2013 @ 01:03 AM | 50,821 Views
Lightening holes in foam is nothing new. The problem is that rigidity and construction integrity is compromised in the process. My goal is to try to eliminate much of the foam in the wings of a "flying W" without sacrificing strength or rigidity.

The Flying W is basically a design similitude of the Robbe Gemini - which was reverse engineered and plans posted on Watt flyer and RCG about 2007 or 2008 as the "Capricorn". The plane is actually an amazing plane and an absolute hoot to fly. The lower the wing loading the better they fly.

So as I'm learning to use a laser cutter I needed a more challenging project and so the Swiss W was born. In addition to the honeycomb pattern cut into the depron, used a 12mm CF tube back bone which extends from the motor mount to the root of the stab. This back bone will be the hard anchor point for the battery and ESC. The firewall is constructed from poly-carbonate that has been heat shaped so it has a 4 degree up thrust. I predict that as the thrust increases, the firewall will flex forward to reduce the amount of up thrust -- possibly helping to remedy one common problem with the W/Capricorn/Gemini -- and that is altitude gain on high throttle. Yes, you can mix in elevator -- but that increases parasitic drag -- a changing thrustline could be more efficient.
Below are the building photos so far.

I used Ultrakote, MonoKote, and New Stuff for different areas covering. New Stuff is much lighter -- shrinks less so is less of a problem deforming the panels. Next preference was ultrakote. MonoKote was really heavy, needed much more heat to start with, leaving less of a range for adjustment of warps and such.

To do it again I'd just use 100% new stuff from alofthobbies.com