05-23-2006, 10:36 PM
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BARCLONE Rocketry
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Join Date: Mar 2005
Location: Mobile, Alabama
Posts: 5,357
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Originally Posted by James Pierson
Great design of the Star Seeker Craig! 
I still have not figued out how you did the hollowed out fins. I keep getting the message WARNING: Plan contains one or more crossed lines  every time I try it. Please explain how you crossed over into the middle section to hollow it out?? |
You have to zoom in as close as the program will allow on the plot screen, and move the various points as close as possible, without allowing any of the lines to cross each other. Think about having the full width of the plot screen as being less than one grid square. It will make this task much easier.
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I also see your landing troubles with these delicate fins. In my design notebook I once had an idea for a landing post (3/16" or 1/4") dowel which was glued onto the main BT and stuck out past the fins bottoms. The idea of the post is for it to take the brunt of the impact on landing and not the fins. Might be somewhat unsightly though and needs to be kept out of the exhaust stream also. Just an idea.
James Pierson
NAR# 77907
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One could probably glue a strip of basswood along the trailing edges of the fins to reinforce them, then fill and sand to shape... |