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1995-12-11
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NORTH AMERICAN B-25B MITCHELL - The Doolittle Raider
Designed by Bill Cline [74547,103]
This is my version of the famous North American B-25B "Billy
Mitchell" that was destined to take part in perhaps the most
famous single raid of WW2. The mission - the Doolittle raid
to bomb the Japanese homeland in April 1942.
My model is essentially correct in all respects with one very
minor deviation. A close inspection of the nameplate beneath
the pilot's window on the left side will reveal an honorariam
to a fellow I am proud to consider a close friend and a guy
who, whether or not you always agree with him, has been a
stalwart of the FSFORUM. It is to him I dedicate the
Doolittle Plane.
The prototype for this plane was initially rolled out in 1939
under a design proposal from the USAAF for an attack bomber.
The initial design model, the NA-40-1, would normally have
been followed by at least several other models, but the
proposed lengthy design testing was halted because of the
outbreak of war in Europe. The need for aircraft production
was so urgent that for all practical purposes, the NA-40B
served as the XB-25.
The original B-25 had only marginal directional stability,
determined to be caused by excessive wing dihedral. This was
rectified by removing all dihedral on the outer wing, thus
giving the B-25 its characteristic gull-winged look.
Eventually, there were at least seven different B-25 models
and a total of 9,816 were built, more than any other
American twin engine bomber.
This model has operating bomb bay doors, activated by the spoiler
switch (press the forward slash "/").
Found the old wheel chocks laying around the airport, so feel free
to use them anywhere. <g> The entrance hatch will drop down soon
as you shut down the engines, too.
Incidentally, the twin 50's in the tail are really wooden dowells,
painted black. It is my understanding this was Doolittle's idea,
but I can't confirm that. None of the 16 Doolittle Raid aircraft
had tail guns, so they were stuck into the observer's position to
discourage stern attacks by enemy fighters.
Specifications: (Taken off the C Model, but essentially
correct for the B also)
Wingspan: 67'7"
Length : 52"11"
Height : 15"10"
Weight : Empty 20300 lbs, Gross 33500 lbs, Max 34000 lbs
Speeds : Max 284mph Cruise 233mph Landing 105 mph (92K)
Power : Two 14 cyl Wright R-2600-9
Fuel : 974 US Gal
Range : 1500 miles
Crew : 5
FLYING THIS B-25
I have tried to assign flight parameters to this model so that
it will, as closely as possible, mimic the true aircraft. My
personal time in the B-25 is minimal (about 100 hours) and
occurred a long time ago, but I do recall it was very easy to
fly and was very forgiving. Pilots will know what I mean by
"forgiving" but for the unitiated, I suppose it means you can
plop it in from fifteen feet in the air without fear of
breaking something. I know, because I did just that during
training!
The Mitchell is a very "honest" airplane and will usually do
what you intend it to do. If you ever find yourself rounding
out fifteen feet too high, "usually" you can add power quickly
and get it on the ground without damaging anything but your
pride. I have not made it fool proof, however. It has to be
a reasonable approach and landing! As with any fairly heavy
aircraft, watch your vertical speed at touchdown.
OK, a couple of warnings and do not exceeds:
Do not exceed 290 knots.
Flap and gear down only under 150 knots
Single engine airspeed is 122 knots
Stalling speeds:
Clean - 90 knots (not bad for an aircraft of this size!)
Flaps & gear down - approximately 75 knots
Normally, with full throttle, you can attain close to 290
knots straight and level, clean.
Normal cruise of around 235 mph (205 knots) can be attained
with power settings of 18 inches MP and 2200 RPM. Since the
FDE of FSFS does not allow exact copying and emulating real
power settings, this is data which I read off the dials while
testing with the FDE set the way it is when you downloaded the
plane.
LANDING PATTERN:
Takeoff - bring back the yoke (or stick) at around 110K IAS
Climb - holding around 133 knots should give you about 1500
fpm climb. Adjust power as necessary.
Downwind- One thousand feet above ground, 140 Knots, drop one
notch of flaps.
Base Leg- drop down to 800 feet AGL, try to hold 125 knots
Final - Flaps to 3/4, gear down. I think it flies best at
100 K IAS on final. I usually hold on just a little
bit of power all the way down.
Over the fence at 100 Knots, pull power off, raise
nose to flare, and let her settle to the runway.
Stall with full flaps is at about 75 knots, so you
should be able to plant her just before that is reached.
Taxiing: A snap! Judicious use of power, aileron (or rudder
pedals if you have 'em) plus gentle tapping of the
F11-F12 differential brake keys will do the job.
INSTALLATION:
The ZIP file contains everything. Copy the *.AIR file to your
\FLTSIM5\PILOTS subdirectory.
Copy the *.?AF files to
your \FLTSIM5\TEXTURE subdirectory.
I have included the .AFX file in the event anyone might wish
to put together the Mitchell in their own color scheme.
DISTRIBUTION INFORMATION:
This model may not be sold as part of any shareware or
freeware collection. It may be distributed freely on Bulletin
Boards and on-line electronic services, as long as no charge
is made for this file other than normal connect charges or
subscription charges to the service.
As usual with my work, I have relied very much on the advices
and help from Rush Mueller, to whom I shout a big "THANK YOU!"
Flight simulator is a registered trademark of Bruce Artwick
Flight Simulator flight Shop is a trademark of BAO Publishing
Bill Cline [Compuserve 74547,103]