There is one more significant advantage to a long burning motor that I just
thought of. During motor burn, drag due to base pressure is significantly
lower than during coast (motor off). Base drag typically accounts for
around 20% of total drag. With a suitable boattail, drag losses due to base
pressure can be reduced even further.
Richard
On Fri, Jan 5, 2024 at 9:40 PM Steve Peterson <dmarc-noreply@xxxxxxxxxxxxx>
wrote:
Thanks for the update..I've read your source code (many years ago)....
--Steve
On 1/5/24 5:14 PM, Bdale Garbee wrote:
"Steve Peterson" <dmarc-noreply@xxxxxxxxxxxxx> ("steve_peterson")
writes:
These days, to be accepted for a record, the rocket has to be weighedFYI, those were the rules for a while, but they got revised again some
before and after the flight, it has to use a "certified" altimeter which
is obtained from and returned post-flight to the Tripoli records
committee, there have to be witnesses that sign off on the flight and
the weights, etc.
time back. You're no longer required to use a records-committee-provided
altimeter. The current rules require the use of known, unmodified,
commercially available flight computers, and still allow baro sensor
only devices for record claims up to 30k feet MSL, but now require GPS
data above that.
I suggest anyone interested in pursuing a Tripoli altitude record review
the rules on the tripoli.org site under Records / Records Committee for
more specifics. I've never pursued a record myself, but as a
manufacturer of flight computers often used in record claims these days
(I'm one of the founders of Altus Metrum), I try to keep up to date on
what the rules require...
Bdale
