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Posted by scott page | May 08, 2013 @ 06:24 PM | 20,627 Views
I've seen lots of trays. Over the past few years I've taken pictures of every tray I saw and compiled a collection of what I likes, and didn't like so much. My wife bought me a wonderful tray that requires a harness to wear properly. It was expensive and effective, but the harness left alot to be desired and the tray had some features that bothered me a bit. One thing is I want my hands to rest in one place so that they are anchored to datum (as in surveying). Secondly I wanted to be able to reach all of the switches easily. I wanted the transmitter to hang level from the strap - and I wanted a strap - not a harness. It needed to be somewhat compact but also protect the transmitter. I don't know if I succeeded at making the perfect (for me) tray or not yet, but for now it seems to be working pretty good.
Its laser cut from OPTIX 18" z 24" .220 in. Acrylic Sheet. The spring on the bottom was made from LEXAN Polycarbonate Sheet that is .093 inches thick. Plastic materials were purchased from Home Depot. The T-nuts and hex cap screws are 3mm. Lexan bends very easily when heated with a heat gun - but easy not to get it too hot too fast or it will bubble and ruin your surface. Acrylic is even easier to bend because it is not so likely to bubble, but will if heated too fast.

I've included several photos of the final product and an zip file with two illustrator files for cutting.
Posted by scott page | Mar 31, 2013 @ 01:03 AM | 15,744 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
Posted by scott page | Jan 21, 2013 @ 01:36 AM | 15,471 Views
In the upper left corner of the RCG menu there is a link to "My RCGroups".
See the attached image for the link below that which will cure chronic pains in the butt.