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Old 01-16-2009, 12:47 AM
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CPMcGraw CPMcGraw is offline
Join Date: Mar 2005
Location: Mobile, Alabama
Posts: 5,357

Originally Posted by rkt2k1
Hi guys, I'm hoping someone can help with the latest design file I've been working on. After reading through the thread on the Centuri Bulldog #5354, I decided to try and sim it in order to clone.

I remember building and flying an original kit as a teenager and still have the BNC-70AJ from it. I used multiple transitions to duplicate the paper shroud detail on the nose cone. I used Semroc components in the Rocksim design and believe it to be a fairly accurate representation. Sim altitudes attained on both B6-4 and C6-5 engines seem to match those documented on the plan.

The problem I'm having is in getting the deployment velocity and minimal launch velocity off launch rod numbers in line. The DV numbers are at parachute shred levels and it looks like design requires a 48" launch rod which surprised me.

If anyone would like to take a look and make any suggestions it would be appreciated.

At some point I'd like to try the design with a 24mm mount.


... Bill

I'm looking at the design, and I've looked at the plans from Centuri. The primary motors for this monstrosity are the B8-5 and C5-3. These are cored motors, with sharp spikes to kick it hard. I don't think your simulation has any major problems, since you matched it close to the original. It's the motors, and the lack thereof of motors with any serious power. Your idea of converting to 24mm might be the only viable solution unless or until someone ever produces core-burners again.
Craig McGraw

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