You can build the model as scale or sport style.
On the left is the Scale fin with the diamond taper leading edge.
The Sport fin has a rounded leading edge.
The inset picture shows where the taper line ends up at the root edge.
Normally I don't use masking tape to shape a taper like this, but the taper is wide and the balsa stock is thin for a fin this size.
To better see the thickness of the taper when sanding, I mark the leading edge with a marker.FIRST - give the leading edge a good wipe of medium CA glue. This seals the edge so the marker ink wont soak into the soft balsa.
The CA glue also strengthens the thin leading edge.
SECOND - Run a marker down the leading edge blackening it.
The edge taper is sanded with a sanding block with 220 grit sandpaper.Constantly check the blackened leading edge when sanding. The blackened edge is easier to see over a light beige balsa. The masking tape prevents you from sanding beyond the wide lower end of the taper.
Go light, you can sand through the tape.
Sand a bit, check the taper, flip over the fin and sand the other side evening up the edge taper.
I was watching the Space X launch yesterday and they were talking about how weather that was far away could effect the status of a launch. I searched the web for info on sounding rockets and found out about the Door Knob.
ReplyDeleteI also saw that Estes had a kit of this rocket available.
I also saw a link that seemed to be familiar so clicked on it. I was pleased you were still building and you were building a door knob sounding rocket. How's that for strange?
I like your info on tapering the fins. I think most people over look this detail. It's when all the small details come together that makes the finished rocket pop.