03-15-2011, 12:26 AM
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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 JP
I later had a chance to meet Tim and had a chance to ask him... about the Tube Fin/ Ring Tail drag calculation problem! Tim knows it is a problem and I am assuming it is on his list of thing to be improved at a later date.
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Good to hear from you, JP!
Having that acknowledgement from TVM about something we've suspected is reassuring, really. We weren't just imagining it... 
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Tim is also suggesting the Velocity at Deployment is best under 50 mph which seems to be a much higher than the 20 mph that most rocketeers use as a standard.
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My standard for LPR, using thin plastic canopies and tape disk attachment points, is the slower the better. If you can hear the canopy "pop", the Dv is too high. Period.
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A little about decal simulations was given. Decals work best if the decal is made more like a complete BT wrap in size and completely covering the BT desired with decal and background colors. Also change the BT’s color in Rocksim to a white and diffused for the decal wrap for best results.
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Meaning we're stuck with calculating the exact diameter of the BT and making a flat 'decal sheet' with everything in place before applying it. Pi, anyone?
(Pi R round, Cornbread R square!) |