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AMERICAN EAGLE
F8F BEARCAT

by Rick Michelana |
Model: F8F Bearcat

Manufacturer: American Eagle

Model Type: 1/5-scale WW II fighter

Length: 69 in. (tail to prop nut)

Wingspan: 86 in.

Engine used: Quadra 75cc w/stock muffler

Propeller: Zinger wood 22-8x14

Channels req'd: 6 (flaps and retracts)

Radio used: Futaba 6 NFK FM

Servos used: Hitec 615 B.B. Metal Gear

List price: $410

Features: multi-layer epoxy/glass fuselage, cowl, belly pan, foam wing-cores, stab, vertical fin, canopy, plans and instruction booklet.

Comments: for modelers who like big birds, especially those who fly WW II fighters.

Hits
• Gets you into the air quickly.
• Excellent flight characteristics.
• Documentation sheet supplied.

Misses
• No CG shown on the plan (new plans will be updated). |
|  Living
in south Texas has its advantages. One of those is year-round flying,
as we have only three seasons: December, January and summer.
"Year-round" flying means that we don't like to spend more time in our
shops than we have to. In my experience, nothing builds faster or
lighter than glass and foam kits, and this is the primary reason I
became interested in the American Eagle* product line.
I
met Bob Neider, who owns and operates American Eagle, during the 1997
gathering of B-17s and other big birds at Bomber Field in Monaville,
TX. I had seen Bob's ads in the IMAA magazine, and I was quite
impressed with his inventory of giant-scale, epoxy/glass and foam WW II
airplanes.
CONSTRUCTION
This is a builder's kit. You must be familiar with model construction;
however, you do not need to be a master builder. American Eagle offers
a very good-quality fuselage, cowl, belly pan, foam wing-cores, canopy,
plans and a basic instruction manual.
Begin
by assembling the skins for the wings, stab and vertical fin. I used
3/32 balsa sheet on the wing, with l/16 balsa sheet on the stab and
vertical fin. When all skins have been made, figure out where the
servos and retracts will go and, using a straightedge as a guide, make
channels in the foam wing-cores with a soldering gun with a
1/2-inch-deep semicircular tip made of electrical house wiring. The
channels will allow you to run servo wires and retract tubing later.
Also, to strengthen the wings and eliminate the use of spars, run a few
bands of self-adhesive, fiberglass wall-joiner tape spanwise on the top
and bottom of your wing. Then, sheet the wings, stab and vertical fin.
The Bearcat plans show fabric on the flight controls, so I made
built-up structures using 1/8-inch balsa cut to flight-control shape,
3/8-inch balsa LE and 1/8-inch balsa false ribs on both sides. These
can be made quickly and easily, and they look good when covered in
Super Coverite*.
No
bulkheads are required in the fuselage. I added a half bulkhead for the
Robart* retracting tailwheel I used and glued this in with Hobbypoxy*
Formula 3. When adding servo plates or rails in an epoxy/glass
fuselage, you can simply install them with thin CA. For added strength,
add a fillet made with Hobbypoxy 3.
I
wanted to get in the air fast, so instead of installing a full cockpit,
I settled for a 1/5-scale pilot bust and then semi-detailed the area
within the cockpit.
I
attached a plywood firewall to the glass firewall after bolting the
wing into place. I used a Quadra* Q-75, and the Bearcat's cowl is so
big that the engine and muffler are concealed.
COVERING
Let's do the fiberglassing first. The wing will be finish-sanded with
only 100-grit paper and a sanding block. Use spackling or light filler
to make everything level. Once all surfaces have been sanded smooth,
lay 3/4-ounce cloth on the surface to be covered with the cloth cut
slightly larger. Now use Hobbypoxy white paint and the gloss hardener
that goes with it. Combine equal parts and then add Sherwin-Williams
no. 54 epoxy reducer (used to clean spray equipment) until the paint is
the consistency of milk. Brush this onto the cloth, painting the cloth
down from the middle of the wing and working out. Then cover the
remaining parts. Let everything dry for about 1 1/2 hours. Sand all the
overhanging glass with 150-grit paper. Now, the glass can easily be
cut, leaving a nice finished edge. Turn the parts over and do the other
sides.
The
advantage of covering with glass and paint is that you can totally
fuelproof even the most intricate areas just by painting them. Once
dry, sand the edges with 150-grit paper. Your wing and other parts
(stab and fin) should now be covered and ready for another coat of
paint. For built-up construction with open bays, I use Coverite
Supershrink and have done so for years. Sand the parts to be covered
with 150-grit paper and apply Balsarite* for fabric. Attach all
Coverite with the grain running spanwise and iron it down. When the
flight surfaces have all been covered, hinge them using Robart
3/16-inch large hinge points.
With
everything hinged and sanded, we can now begin the process of priming
for paint. Paint will not hide poor preparation; whether it comes from
a can or a gun, it only emphasizes the surface it rests on.
I
use lacquer primer, glazing putty, plastic spreaders and lacquer
thinner. Throw a portion of lacquer primer on the wing and spread it.
This forces it into the weave of the fiberglass cloth. When it's dry,
simply sand again with 150-grit paper. This must be done before you
spray the first primer coat. You'll be amazed at how good your first
coat of sprayed primer will look.
Spray
the fuselage with one coat of primer to expose the pinholes that are
common in all fiberglass products. To solve this problem, mix some
primer with glazing putty in a 50:50 ratio. Thin this mixture with a
little lacquer thinner to ease spreading.
All
lacquers shrink during the drying process, so you may need to use two
or three coats. Don't worry about weight, and continue to build up the
areas that have defects. You'll sand most or all of this off, leaving
only the filled pinholes. After everything has been sanded, spray
primer and fix only the areas that need attention. When all has been
done to your satisfaction, spray with a final primer coat and sand with
dry 220-grit paper to level the primer surface and remove any excess. I
final-sand for painting using maroon Scotch-Brite pads. Now the model
is ready for painting.
I
use only lacquer auto paints for the base and Krylon Interior/Exterior
for all trim and color changes. When the entire model has been painted
and all trim colors have been added, wet-sand very lightly with
600-grit paper. Dry everything thoroughly, wipe it all down with a
tack-cloth, and then spray on clearcoat (lacquer or urethane). The
urethane clear will make the paint look very glossy and wet; the
lacquer will provide a more satiny finish. The Bearcat is now ready for
radio installation and flight test.
AT THE FIELD
I called a couple of my friends, and we headed to our flying field in
Edinburg, TX. We have a 150x700-foot section for model use and also a
3,500-foot paved clearway on the end of the model runway in case we
want to land a little hot!
The
American Eagle Bearcat is one incredible flying airplane. If you can
fly a .60-size pattern ship, you will have no problem flying this
giant-scale WW II fighter. You must know how to build before you tackle
this project, but you do not need to be a master builder. If your time
is worth anything, you'll see that the amount of finished work in this
and other American Eagle kits makes them well worth the asking price.
*Addresses are listed alphabetically in the Index of Manufacturers in the magazine.
FLIGHT PERFORMANCE:
The Quadra 75 came to life with one flip of the stock spring starter. I
am a definite believer in the stock Quadra 75 for all giant-scale
warbirds. No electronic ignition for me! With an ignition engine, when
the battery dies, the engine stops. When a magneto is used, you have
the fire (spark) in the combustion chamber as long as the engine is
turning. It doesn't get any more reliable than this.
• Takeoff and landing I taxied the big Bearcat to the
arrival end of the runway, advanced the throttle and simultaneously
applied almost full right rudder. I have much experience with tailwheel
warbird fighters and have come to realize that this is standard
procedure. The Bearcat tracked straight and was rolling on the mains
instantaneously. With only a 50-foot rollout, the mains broke free from
the bonds of gravity and the model was airborne. The Bearcat flies very
directionally and, like a bullet, goes where you point it.
I
land all my models in the same way: on the downwind leg, reduce the
throttle by 2/3 and maintain altitude, and airspeed will naturally
bleed off. Extend the gear and flaps. Now, for the real secret to
making good landings: release backpressure on the elevator, and as the
nose begins to sink, apply up-elevator trim so that you now have no
backpressure on the elevator gimbal. Good landings come only from
stabilized approaches. The Bearcat landed ever so softly on its mains,
as I reduced power when the wheels were just inches off the runway.
• Low-speed performance
This model is very stable with the flaps deployed to 30 degrees. Flying
full-size planes has taught me to fly models with the same techniques.
Whenever you change airspeed, you must change your trim. If you never
use the trim knobs, you aren't flying your airplanes as they were meant
to be flown. With power reduced to 1/3, and the flaps down and trimmed
for level flight, the Bearcat will hang in the air with no bad
tendencies. Many modelers in our club estimate a 15mph forward speed.
• High-speed performance
The Quadra 75 has 8hp to pull this 25-pound plane. This aircraft has
good high-speed capabilities and actually behaves like every giant
warbird I've ever flown: too fast for true scale flight appearance.
Most of my showboating is done at 3/4 throttle. When it's time for big
loops or Immelmann turns, I simply crank in the remaining power on the
way up.
• Aerobatics
There's no scale maneuver that this airplane is not capable of. The
biggest limitations will be those of the pilot. If you are brave
enough, this bird will do it. Our club is noted for the number of
modelers who fly low-level aerobatics. When I make an inverted pass 5
feet off the deck with this warbird, our spectators really get a
thrill. Does this take a lot of talent?—absolutely not; though it does
take a lot of trim. It amazes me how many modelers will roll inverted
then sit there holding the stick forward. Please don't do this. Roll in
down-trim for a hands-off condition at the speed you desire, and then
just fly. If you are inverted 5 feet off the ground and not in trim,
all it takes is one hiccup, and it's over.
The
American Eagle Bearcat is one fine flying machine. I now have over 60
flights on this aircraft and have had it at two airshows. It's one
model that will get everyone's attention. |
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