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
