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-   -   MANUAL Calculation Of CENTER OF PRESSURE . . . (http://www.oldrocketforum.com/showthread.php?t=19496)

Ez2cDave 04-23-2021 12:39 AM

MANUAL Calculation Of CENTER OF PRESSURE . . .
 
6 Attachment(s)
Back in the day, circa 1995, a Tripoli rocketeer, named Bruce Lee, developed a simplified method to manually calculate Center of Pressure.

His 10-year old son was able to do the computations with ease.

Dave F.

mojo1986 04-23-2021 06:20 AM

Smart 10-year old!

barone 04-23-2021 08:30 AM

I still use the cardboard cut-out method. :eek:

Ez2cDave 04-23-2021 10:17 AM

Quote:
Originally Posted by mojo1986
Smart 10-year old!


DEFINITELY, a LOT SMARTER than what today's "Schools" are turning out !

Dave F.

Ez2cDave 04-23-2021 10:21 AM

Quote:
Originally Posted by barone
I still use the cardboard cut-out method.


Nothing wrong with that, as it is very "conservative" about CP location.

It gives a "safe" CP location ( FORWARD of its ACTUAL location ) . . .

The "downside" to the Cardboard Cutout method is that it "calls for" extra Nose Weight, which reduces performance and creates an "overstable" situation.

Dave F.

ghrocketman 04-23-2021 10:43 AM

Does this Bruce Lee also have a sister named Ugh ?

I don't ever bother with CP calculation. I just fly it. If it flies ok, the CP/CG relationship is ok too. :chuckle:

Ez2cDave 04-23-2021 11:32 AM

Quote:
Originally Posted by ghrocketman
I don't ever bother with CP calculation. I just fly it. If it flies ok, the CP/CG relationship is ok too. :chuckle:


That gave me a "flashback" to my youth . . . Home-made fireworks, labelled with a felt-tip marker "Light Fuse & Run Like Hell" . . . LOL !

Dave F.

tbzep 04-23-2021 11:57 AM

Quote:
Originally Posted by ghrocketman
If it flies ok, the CP/CG relationship is ok too. :chuckle:

Their relationship may seem ok, but they still need a chaperone.

shockwaveriderz 04-23-2021 12:17 PM

this is what OpenRocket is for. or RockSim or RASAero 2

ghrocketman 04-23-2021 12:39 PM

Chaperone nuthin'
We dun't neeed no steeenkingg chaperone!


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