Kelly
Usually remembers to get the pointy end up
I've got a new build, and using shear pins for the first time. Fuselage is 7.5" sonotube, and I made a custom glassed nosecone. The nosecone fit is pretty loose, but I'm using pins, so no problem, I figured. I ran some calcs to show that 3, 2-56 nylon screws should work well. I drilled 3, 1/4" holes through body tube and NC, filled them with epoxy, and drilled 2-56 tappable holes in the body and clearance holes in the NC.
In the first ground test, the NC deployed exactly as intended, but upon inspection I see that the 3 screws have not sheared, but simply bent away. Probably the undersize shoulder diameter on the NC contributed to this.
How big of a problem is this? Should I try to somehow build up the shoulder size, around the pins, in order to get a tighter fit and a better shearing action? Or just be happy that the NC is deploying properly?
Kelly
In the first ground test, the NC deployed exactly as intended, but upon inspection I see that the 3 screws have not sheared, but simply bent away. Probably the undersize shoulder diameter on the NC contributed to this.
How big of a problem is this? Should I try to somehow build up the shoulder size, around the pins, in order to get a tighter fit and a better shearing action? Or just be happy that the NC is deploying properly?
Kelly