The grid fin frames were milled from a block of 6061-T6 aluminum and each weighs 105g. Each aluminum 1" x 1" x 1" grid insert weighs 29g. The total weight of the grid fins is 4 x 134g = 536g, or 18.91oz, or 1lb 2.907oz.At what weight are the grid fin frames coming in?
So far, the needle tip was molded from a blunted Semroc conical balsa nosecone [BT-20 2.3" SEM-BNC-20SU] from eRockets and cast using West Systems fiberglass resin with a black pigment; the needle shaft is 20mm OD X 18mm ID X 500MM roll wrapped carbon fiber tube purchased on eBay; the centering rings are 1/4" aircraft plywood purchased from a local hobby shop, and custom cut to the appropriate outside and inside diameters by me using drill press mounted hole cutters with cobalt steel cutting tips; the body tube and coupler material for everything except that airframe and AV-bay is Blue Tube 2.0 purchased from Always Ready Rocketry; the airframe and AV-bay are G-10 fiberglass purchased from Wildman Rocketry; the grid fins were machined by High Desert Precision CNC Machining Nosala's Hobby Shop; the 1" square 1" thick grid material was purchased from 1800Ceiling.com; the nuts, bolts, and other hardware were purchased from McMaster-Carr. The sizes, dimensions, and positioning of the parts are shown in the OpenRocket files attached.Okay but you HAVE to tell us where you got the outer components and of what the inner components are comprised.
About $45 each, I provided the machining file.[May I] ask how much those grid fin frames cost? I just have no idea what milled block of aluminum like that would set you back.
Authentic civil war piece... bequest from my father-in-law, along with the picture.I'm not sure which is more epic.......this build, or the musket on the wall.........
I've been wondering how long it was going to take for someone to catch that... I didn't realize I had a problem until I put the launch rail between the grid fins to verify clearances, and the rail hit the plunger. I have only come up with two options, either use rail button standoffs or cut out the plunger (on all four sides for symmetry). I haven't decided what to do yet... which would you do?awesome build, assume a standoff will be used for the rail button?
So that would make it a piston?.......flyaway rail solves the problem, but if not a consideration would do the standoffs the design is so awesome
or you could do a design change and the plunger gets ejected at launch - stays on the ground LOL