Re: CEP ? Korean War Jet CAS
- From: "W. D. Allen" <ballensr@xxxxxxxxxxxx>
- Date: Wed, 29 Mar 2006 11:09:20 -0800
Ed,
Good summary of the vagaries of old fashioned dive bombing. It got even more
marginal for over-the-shoulder loft bombing with nuclear weapons.
WDA
Navy Air 1955 - 1959
end
"Ed Rasimus" <rasimusSPAMLESS@xxxxxxxxxxx> wrote in message
news:aqdl229u65dutf1vsmv2gt4jajvo51hbm7@xxxxxxxxxx
On Wed, 29 Mar 2006 15:55:01 GMT,
jshinal_REMOVE_THIS_PART@xxxxxxxxxxxxxx (John S. Shinal) wrote:
I've been reading some memoirs of Korean War pilots making
bomb and rocket attacks using the earlier jets, F80s and F84s (?).
What was the CEP of dive bombing during that era for :
Typical pilots
Really skilled pilots
Their comments indicate that even large barns were relatively
safe from their rocket attacks. Was this likely due to :
"beaten zone" as a function of dive angle
sight settings
windage error
Dive bombing is a system of complex factors convoluted by a large
portion of magic and mirrors.
At it's most basic, you have an airplane at a pre-determined dive
angle at a given airspeed and altitude above the ground releasing a
given shape with a fixed profile and aerodynamic drag coefficient
which from the point of release to the ground follows a ballistic
course.
The whole system of aircraft and bomb is moving in an airmass relative
to the target. The velocity of the air mass relative to the target is
NOT a constant from start of delivery to release nor from release to
impact.
The environment of the delivery is neither constant nor passive. The
factors of wind, barometric pressure (for altitudes), temperature (for
air density) or visibility are forecast by meteorologists at some
distance from the area. Meanwhile the folks around the target are
doing their very best to distract you from your job.
Throw in variables like impulse variations in the release cartridges
on the suspension gear, mud on the bomb, bent fins, etc. and it gets
complicated.
The sight is depressed from the flight path reflecting the fact that
the bomb will be ballistic from release to impact. Since it is
depressed, it offers a pendulum effect--bank slightly and the pendulum
swings. The sight depression is only accurate at the point of release
and then only if the dive angle, airspeed, altitude, g-load and bank
angle of the aircraft is as predicted. Slow/fast, high/low,
steep/shallow all have different amounts of error to introduce.
(Generally "tiger" errors are much smaller than their opposite so
fast, steep and low release give better bombs.)
Typically one must place the pipper at release upwind from the desired
impact point a certain distance to compensate for the wind. At initial
roll-in, the pipper must be two to three times that distance so as to
allow for stabilization and tracking as the aircraft proceeds to
release altitude and airspeed. (Notice that angle-of-attack is
changing as airspeed builds impacting the pipper depression.)
All that goes on at once while people shoot at you.
Qualification criteria for high angle dive bomb used to be 140 feet
CEP. For low angle bomb (10 degree) it was 105 feet. For 2.75" FFAR it
was 40 feet--so a qualified aviator should be able to hit that barn.
Laydown or "skip" bomb was a 25 foot wide box 200 feet long with a 10
foot tall target at the end. Dropping level from 50 feet altitude was
virtually 100% in the box or hit-on-the-fly.
Ed Rasimus
Fighter Pilot (USAF-Ret)
"When Thunder Rolled"
www.thunderchief.org
www.thundertales.blogspot.com
.
- References:
- CEP ? Korean War Jet CAS
- From: John S. Shinal
- Re: CEP ? Korean War Jet CAS
- From: Ed Rasimus
- CEP ? Korean War Jet CAS
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