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Old 05-12-2005, 11:30 PM
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CPMcGraw CPMcGraw is offline
BARCLONE Rocketry
 
Join Date: Mar 2005
Location: Mobile, Alabama
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Quote:
Originally Posted by CPMcGraw
...this setup requires the D12 to be lit 0.15 seconds AHEAD of the three C6s to achieve a peak thrust at the same moment...


Another layer of proof that the human brain doesn't work after midnight...

Or even after 11 PM...

When I overlayed the C6 graph over the D12 graph, what I get is a 'double spike', or a two-tiered thrust curve, where the peak thrust of the combined C6s begins to decay before the D12 has come up to full chamber pressure. Essentially, the three C6s would be the dominant force lifting the rocket, although the D12 would contribute signifigantly to the overall effect. The three C6s also have greater residual thrust than the D12...

Three D12s plus three C6s also peg the limit on fuel at 3.96 oz of powder for the combined all-up stack...

So, as long as ALL FOUR motors ignite AT THE SAME TIME, this would be one impressive bird. Going to need a couple of gel-cells, or a really fresh deep-cycle truck battery on a relay-driven launch system with VERY reliable igniters to achieve this level of reliability. Anything short of perfection might cause a few folks to need a change of underware...

Craig...
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