rbelknap
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- Feb 24, 2012
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My first attempt at filling a fin-can with 2 part foam was marginally successful:
As you can see in picture 2, there is a small void along the fin root. I'm not too worried about it, but the other side (picture 3) is a bigger problem. At this point I'm wondering if I should drill some holes in the side of the airframe to inject more foam, or try to dig out enough of the foam in the rear to clear a channel through which to inject the foam.
Holes through the airframe would probably be easier, but I know I'm never going to get them filled and smoothed out enough to hide them when the rocket eventually gets it's final coat of paint. I'm also concerned about getting the holes placed correctly to give the foam room to escape/expand. I don't want to blow out the side of the G12 tube.
I'm looking for advice on the best way to get that large void filled.
As you can see in picture 2, there is a small void along the fin root. I'm not too worried about it, but the other side (picture 3) is a bigger problem. At this point I'm wondering if I should drill some holes in the side of the airframe to inject more foam, or try to dig out enough of the foam in the rear to clear a channel through which to inject the foam.
Holes through the airframe would probably be easier, but I know I'm never going to get them filled and smoothed out enough to hide them when the rocket eventually gets it's final coat of paint. I'm also concerned about getting the holes placed correctly to give the foam room to escape/expand. I don't want to blow out the side of the G12 tube.
I'm looking for advice on the best way to get that large void filled.