THE PREMIER RC MODELING MAGAZINE
AMERICAN EAGLE
F8F BEARCAT
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by Rick Michelana
Model: F8F Bearcat
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Manufacturer: American Eagle
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Model Type: 1/5-scale WW II fighter
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Length: 69 in. (tail to prop nut)
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Wingspan: 86 in.
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Engine used: Quadra 75cc w/stock muffler
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Propeller: Zinger wood 22-8x14
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Channels req'd: 6 (flaps and retracts)
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Radio used: Futaba 6 NFK FM
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Servos used: Hitec 615 B.B. Metal Gear
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List price: $410
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Features: multi-layer epoxy/glass fuselage, cowl, belly pan, foam wing-cores, stab, vertical fin, canopy, plans and instruction booklet.
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Comments: for modelers who like big birds, especially those who fly WW II fighters.
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Hits
• Gets you into the air quickly.
• Excellent flight characteristics.
• Documentation sheet supplied.
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Misses
• No CG shown on the plan (new plans will be updated).
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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.
dot_clear.gif - 43 BytesI 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.
dot_clear.gif - 43 BytesBegin 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*.
dot_clear.gif - 43 BytesNo 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.
dot_clear.gif - 43 BytesI 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.
dot_clear.gif - 43 BytesI 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.
dot_clear.gif - 43 BytesThe 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.
dot_clear.gif - 43 BytesWith 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.
dot_clear.gif - 43 BytesI 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.
dot_clear.gif - 43 BytesSpray 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.
dot_clear.gif - 43 BytesAll 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.
dot_clear.gif - 43 BytesI 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!
dot_clear.gif - 43 BytesThe 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.
dot_clear.gif - 43 BytesI 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.
dot_clear.gif - 43 BytesThe 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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