[AR] RE: [AR] Fins attached to 9” rocket
- From: "Mark C Spiegl" <mark.spiegl@xxxxxxxxx>
- To: <arocket@xxxxxxxxxxxxx>
- Date: Wed, 4 Apr 2018 22:07:44 -0500
My stuff is serious low-tech junk compared to Bill's project, but I have my own
hack for attaching aluminum fins. The airframe in the pic is almost minimum
diameter. The push nut and post are ground as low as possible after assembly,
then a separate motor tube is slid past the fin assembly.
That specific rocket whistled-in aerodynamic from "up there." (altimeter
didn't survive) The fins remained solidly attached after a hard hit.
I have been planning to try something very similar to Bill's countersunk
screws, sealed with RTV. This would be a 200-250 psi low pressure hybrid so the
construction requirements are forgiving. The fuel grain could be cast in place
if necessary, but I prefer to make it separately.
(I haven't started working on the countersink approach)
More pics:
http://www.spiegl.org/rocket02/fincan
--MCS
.
Other related posts:
- » [AR] RE: [AR] Fins attached to 9” rocket- Troy Prideaux
- » [AR] RE: [AR] Fins attached to 9” rocket - Mark C Spiegl