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Posted by bzdang | Nov 24, 2019 @ 05:53 PM | 6,630 Views
I installed a push-button in my QX7 for DLG launch mode. I can reach it while maintaining a firm grip with my other three fingers on the radio, and it has a rounded shape which is easy to park my index finger on or next-to without accidentally pressing it. It has a nice firm positive action when pressed.
Where I installed it there is enough space inside for the threaded body and terminals. Source is Digikey, part number is EG4575-ND
Posted by bzdang | Nov 16, 2019 @ 09:37 PM | 3,295 Views
I've been reading the Ballast-Theory discussion and thought of a way to easily add and remove ballast without taking off the wing. This was inspired by my friend's sportbike streamlined back-pack.
I picked up some modeling 'stuff' that I remember my kids using, which will air-dry and is lightweight and resilient (foam-like). Made a mock-up by sticking some supermagnets on top of the wing screws, then forming a long teardrop and mashing it half-flat over the wing center section. I will refine the shape and buy some tungsten weights to embed at the c.g. for the final version. I expect I'll need to glue the magnets and weights after the thing cures.
Posted by bzdang | Nov 16, 2019 @ 09:02 PM | 2,992 Views
This is an idea I posted earlier here.
No-cost fixture to check c.g. - raid the kids' Lego box!
This one yields 54mm from leading edge, for my Hawk.
You can use cylinders or heads, and easily fine tune the fixture with tape or foam tape.
There is some foam tape on top of the rails to prevent slippage.