Construction Details Finish&Fly Events and Projects Building from Plans Raw Materials Q&A Tools Construction Log

Center Wing


I determined the ideal position for the batteries during August 2003 when I had the aircraft assembled in my backyard.  After a series of Weight and Balance scenarios, I established that the batteries should be right behind the first L stiffener in the fuselage.  That's what I expected from the start.

So, I removed the stiffener and replaced it by a 3/4"X3/4"X1/8" extrusion.  I installed another extrusion so both make a solid support for the batteries.  Noticing how the extrusions can flex under heavy weight, I decided to reinforce them so they have a shape similar to the Z stiffener ahead.  Now, it is very rigid. 

I mounted the batteries on a .040" thick sheet of aluminum on which I made a rack with stiffeners and a strap of .025" aluminum.  I made the fuselage opening so that the battery tray will come flush with the skin (there is a .025" spacer on top of the .016" skin and then, the .040" inside mounting plate.

The battery tray attaches to the inside support with four 3/16" AN525 screws (that I may replace with AN3 bolts).

To protect the connectors from accidental shorts (that would happen when I take the battery in or out, I installed pieces of bicycle tire tubes over the wires and connectors.

IMG_0987.JPG (68386 bytes) IMG_0989.JPG (113667 bytes) IMG_0983.JPG (109475 bytes) IMG_0986.JPG (88941 bytes) IMG_0991.JPG (74465 bytes) IMG_1005.JPG (113994 bytes) IMG_1006.JPG (99934 bytes) IMG_1008.JPG (116432 bytes) IMG_1009.JPG (109767 bytes) IMG_1040.JPG (132371 bytes) IMG_1042.JPG (88515 bytes)



Home ] Up ] Construction Details ] Finish&Fly ] Events and Projects ] Building from Plans ] Raw Materials ] Q&A ] Tools ] Construction Log ]
e-Mail me at

Counter reset on August 10, 2000 (4302 visits on main page prior to reset)
Michel Therrien, (c) 1999 - 2003.