There must be a reason why modern mortar or say Excalibur guided artillery
rounds have so many fins.
jd
From: arocket-bounce@xxxxxxxxxxxxx [mailto:arocket-bounce@xxxxxxxxxxxxx] On
Behalf Of Nels Anderson
Sent: dinsdag 14 juli 2015 20:59
To: arocket@xxxxxxxxxxxxx
Subject: [AR] Re: elementary things
I would think it's best to just project all fin areas onto one plane, rather
than adding up the areas of all fins. My reasoning is that as the rocket's
angle of attack increases, it's only fin area normal to the airflow that
contributes a correcting force.
On 07/14/2015 07:40 PM, John Dom wrote:
I remember there was that weighing method to determine the pressure point on
the axis of the rocket drawing. One simply cut out the rocket outline on
cardboard and noted where the figure came in balance on a scale.
But I always wondered how to draw the fin surface in 2D when 3 or 4 or 12
fins were involved (mortar shell). Does one add the surfaces up for a 2 D
representation to measure the pressure point in that case?
jd
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