On 5/4/05 6:09 AM, in article
et, "Thomas Schoene"
wrote:

José Herculano wrote:
Boeing is in no visible hurry to develop a more elegant solution to
the weapons separation issues that lead to the 4º cant / toe-out of
the Super Hornet's wing pilons. I'm not hearing too much complain
from the Navy either. The reasons that have me worried about this
current solution a
1: It increases drag, impacting range and performance;
2: It increases the aircraft's head-on radar signature;
3: It generates great lateral stress loads on the weapons and the wing
itself.

I thought the point of the toe-out was that it actually aligns the weapons
with the local airflow, meaning that it does not increase drag or stress
loading. Am I wrong?

Not a Super Hornet guy, but I do remember seeing this one first hand at
Tullahoma, TN when the solution was being developed.

In the original design during stores separation wind tunnel testing before
any full scale production, the engineers discovered that the bombs had big
dispersion errors when dropped off of the non-canted pylons (IIRC on the
order of about 1,000 foot error for a medium altitude drop). Essentially,
dumb bombs were not predictable because of aerodynamic interaction with the
airframe immediately after release.

Several solutions were proposed (not all inclusive):

1. Stronger CADS/ejector feet to push the stores off the aircraft harder.
2. Longer pylons.
3. Strake/wing redesign.
4. Pylon canting.

The first three were rejected for cost (short term, of course, and I don't
know the numbers).

Number 4 was the only viable solution for an aircraft that was already well
on its way from a design standpoint.

At this point, the Navy has no real "elegant" solution left. They're stuck
with the cheap solution for now.

--Woody