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RCU Review: Pacific Aeromodel 27%
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Contributed by: Dick Pettit | Published: February 2009 | Views: 30096 |
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Review by: Dick Pettit
27% "Gee Bee Model Y" 2nd Generation ARF
Intro & Specs RTF Contents Assembly Test Flying Summary Manufacturer & Distributor Info
Pacific Aeromodel Mfg. Inc 12368 Valley Blvd. El Monte, CA 91732 www.pacaeromodel.com ORDER: (800) 780-0100, TEL: (626) 618-0300
quick and easy assembly all parts suitable for a plane of this type and size, gentle, stable and graceful in the airmildly aerobatic G-62 is an excellent power choice
BACKGROUND: "The Gee Bee Model Y Senior Sportster was built in 1931, and this aircraft was slightly larger than the previous Warner powered Gee Bees. The Y model was a two seat version, just two were built, NR11049 and NR718Y." "By March of 1931 the great Depression had world wide scope and was continuing to deepen and the market for single place sport planes was non-existent. The Gee Bee Senior Sportsters were expensive airplanes, the 'D' cost: $4980, and the 'E' cost: $5,230, which compared unfavorable with other aircraft. None of the eight Senior Sporsters survive today."
Model Gee Bee Senior Sportster Model Y Airplane Type: 27% Sport Scale ARF Distributor: Pacific Aeromodel Mfg. Inc Suggested Retail Price: $699.99 Wing Span Advertised: 97" Wing SpanMeasured: 96 3/16"
Fuselage covering is pieced together at several places two cracked fuselage formers due to shipping damage control horns supplied are different from those shown in manual several steps in the manual contain info that is incorrect (probably a typo) a few more wrinkles showed up out in the sunshine
Wing Area Advertised: 1576 sq. in. Wing Area Measured:1606.4 sq. in. Airfoil Semi: Symmetrical
The Kit: When the term "Gee Bee" is spoken at a flying field, people scramble to get under cover if one is about to take to the air. Granted, many Gee Bee racers are just a bit on the "squirrelly" side when it comes to talking off and landing, but there's one Gee Bee that handles like a dream, and that's the Gee Bee Model Y Senior Sportster. A beautiful and sleek looking low wing radial engined beauty, the Model Y is one of the more normal looking Gee Bee designs when compared to their other pure race planes. It was quite large with a 30 foot wingspan and could hold its own either while sport flying or even in an air race. The Model Y would make a perfect basis for a scale model, especially if done in a large size.
That's exactly what Pacific Aeromodels has done with the Second Generation of their 27% Gee Bee Model Y. The first generation series had a solid wire main gear arrangement while the newest release features spring loaded struts for smoother ground handling. The 97" wingspan model requires a 40cc to 62cc gas engine, the smaller needing some extra nose weight for balance and the larger needing a little tail weight to balance. It is available in three color schemes, only one of which is true to scale. The white with red trim version is close enough to scale for most people, while a black and yellow version and a dark red and black color scheme are also available for those modelers desiring something that is just a little different. When Pacific Aeromodels announced that the newest generation of large Senior Sporsters would be available, I made arrangements to put my name on the list to get one. The Senior Sportster shipping boxes (there are two of them) arrived at the shop shortly after they were shipped. The smaller box held the cowl, dummy engine and huge wheel pants while the larger box held the fuselage, wing panels, tail surfaces and everything else. I took out each and every part, checked it for shipping damage, finding two cracked fuselage formers that made the covering appear to be extremely wrinkled. I used some balsa sticks to "prop up" those broken former pieces and the covering became quite tight again. The two wing panels were packed inside bubble wrap, as were the stab with elevators and the fin with rudder. The point style hinges were installed in pre-drilled holes but were not glued in place to allow the builder to remove the control surfaces to shrink any bubbles or wrinkles from the covering. I used my covering iron with a protective sock on the shoe along with my heat gun and a soft cloth to track down and remove any bubbles that were hiding under the Oracover covering.
Assembly: The ailerons are already hinged for shipping but the hinges are not glued in place. I removed all of them and checked to see if they could be reinserted without the pivot points too far from each mating surface. If they stuck out too far, I could use a countersink bit to open up the hinge hole a little. All the holes were properly drilled and I used some Pacer Hinge Glue to install the hinges to the wing panels. After these cured for an hour or so, I glued the ailerons to the wing panels using more Hinge Glue and let everything cure while I ate dinner. The aileron servos, a pair of Spektrum 821 digitals, were installed into the pre-opened servo mounts after wiring in some homemade servo extension wires. I used DuBro Heavy Duty Servo Arms to connect the servos to the ailerons along with the pushrods included in the kit. These may be either 4-40 or 3mm, but are definitely larger than the ones I have seen in other ARF kits The main landing gear legs are a pair of struts that telescope under spring pressure and are braced to the back of the wing for more support. The legs are bolted to mounting plates with substantial sized hardware and the rear brace is then loosely installed. The wheel pants come as two piece units, a lower part that eventually gets screwed to the wing panel and an upper part that bolts to the movable part of the gear leg and will telescope inside the lower piece. After the wood formers are removed from the pant parts, the lower fixed piece is slipped over the gear leg and the rear brace is secured to the wing. Then the upper movable part is gently twisted over the gear leg forks and with a little luck and a few religious incantations, it will eventually telescope into the lower piece. The 5 ½" foam wheels and steel bolt axles were installed using some nylon spacer pieces that were in the hardware bag but were not described. The movable part of the wheel pants gets bolted
not described. The movable part of the wheel pants gets bolted securely to the gear leg forks and these nylon spacers probably prevent damage to the fiberglass. Wheel collars keep the wheels centered on the axle bolts and the movable pant parts attach to the fork with 4-40 bolts. Once the pants are in place, the fixed parts were screwed to the wing panels with small wood screws.
The wing panels were now joined using the metal main joiner tube and a pair of small aluminum alignment tubes. The pre-installed wing dowels fit the holes in the fuselage perfectly and the wing bolts fit into the fuselage blind nuts with a little fiddling. The stab fits through a slot in the fuselage and aligned vertically with the wing after a little sanding on one side of the fuselage slot. I centered the stab to the fin post, aligned the stab tips to the rear of each wing panel and marked the position of the stab in relation to the fuselage. The wings were removed and separated and the stab was reinstalled in the fuselage slot. There is plenty of wooden structure at the fuselage stab opening and rather than use epoxy to hold the stab in place, I used thin ZAP dripped into each joint sparingly to secure it. The elevator halves were then hinged into place with Pacer Hinge Glue and allowed to cure. The elevator horns are now installed using small wood screws and the elevator servos are mounted in the pre-cut servo openings. Like the ailerons, the elevators are connected to the servos by 4-40 rods and clevises supplied in the kit and DuBro HD servo arms. Before the fin and rudder were installed, I cut out the Gee Bee logo pieces from the self-stick vinyl graphics sheet and applied them to the fin and rudder using a light misting of window cleaner and a soft cloth. When these were dry, the fin was glued to the slot in the fuselage making sure that it was 90 degrees to the stab. This also requires a little sanding on the tab that fits inside the fuselage
The tail wheel assembly is a coil spring arrangement that is supported by a bracket on the bottom of the fuselage and is driven by the rudder. I really don't like to place any extra side loads on the rudder servo, so I replaced it with a leaf spring tail wheel assembly from my local stock and I'll connect it to the rudder with a pair of coil springs. The rudder is then hinged into place, holes for the rudder horns are drilled and the horns are attached. While I'm back here, I rigged up the pull-pull control linkage for the rudder using the parts supplied. The rudder servo, a JR ST-126 HD unit, mounts in a plywood tray in the fuselage. If a lighter engine were chosen to power the Gee Bee, the elevator servos could be moved to this tray since it has 4 extra servo openings available, two on the rudder servo tray and two on the side of the fuselage, which will probably be used for the throttle and choke servos once the engine gets here. The engine box is an adjustable sliding unit that can be positioned anywhere inside the front of the fuselage to accommodate any length of engine. The manual says that the box "…is not glued in…" but it was really tight and I had to use several implements of destruction to get it out. The firewall and front of the engine box were already coated with thinned epoxy which probably contributed to the tight fit. I marked the engine mounting hole locations on the front of the box and drilled them for ¼-20 bolts that will hold my Zenoah G-62 engine and Bennett Built cup type mount in place. There is built-in right and down thrust in the engine box, so I marked the top boldly and will be sure to install it correctly.
The huge fiberglass cowl with the dummy radial engine was put into position against the four wood blocks that align it to the fuselage. The prop hub was not centered, but before epoxying the motor box permanently, I set the engine fore and aft position and marked the box at that location. The dummy engine was cut out just in front of the Zenoah G-62 cylinder head to allow cooling air to pass only through the engine and nowhere else. I also installed the throttle and choke servos and associated linkage using the parts supplied in the box.. The Gee Bee comes with a large 750 ml. fuel tank, but the brass tubes supplied are larger than the standard 1/8" tubes found on aftermarket fuel tanks. Rather than try to modify the fuel tubes, I used a DuBro 24 ounce tank with a gas stopper and some DuBro fuel barbs to keep the fuel tubing from slipping off. I set up a 2 line tank system and put a tee in the carb line for filling and draining. The tank fits inside the engine box with a little foam padding and I used a large rubber band and two cup hooks to keep the tank in place. Only a few details remained like adding the ¼ scale pilot figure from Great Planes and installing the Vess 23B wood prop and Tru-Turn prop hub on the G-62. I took the completed Gee Bee to the back yard to run the engine. Taxi tests showed that the G-62 pulled the model just fine, both on hard surface runways and on grass.
I made plans to meet Rick Cawley, my assistant test pilot, at our local field for the first flights on the Gee Bee Model Y. I assembled the plane, took the ground photos and fueled up the plane for the first test flight. After a quick radio range check, I taxied the plane to the far end of the runway, took a deep breath and advanced the throttle slowly. The Gee Bee accelerated briskly, its tail lifted and it was off the ground in short order. After turning around and heading the other way, only a click or two of down and left trim was needed for straight and level hands off flight. I then tried a few simple aerobatic maneuvers like a loop and an axial roll, which turned out to be almost pattern plane-like. A stall turn was easy to do and looked really graceful in the air. Other maneuvers like a Cuban Eight and a short knife edge also liked great. I then realized that I had not pushed the throttle stick much past the halfway point. I pointed the nose of the Gee Bee straight up, added full power and it just kept climbing. I'd say that there is sufficient power for just about anything. While the Gee Bee was way up there in the sky, I cut the power, fed in full up and full left rudder and it dropped into a stall and then began spinning. I let it rotate a few turns and once I released the sticks it resumed normal flight, straight down, but normal. A little up elevator and it was back to horizontal flight. I then tried a few high speed passes for the camera, adding full power and diving from the left end of the field. The Model Y just cruised across the field, engine humming and looking just like the typical racer of its day. I did this one more time and then decided to set up for a landing to check things out on the ground. I reduced power on the downwind leg, turned final and once aligned with the runway, cut power back to a high idle. The Gee Bee just glided to the grass runway, and after a tiny bounce, it settled into a perfect three point landing. Other than a few wrinkles in the covering, the Gee Bee Model Y had no obvious problems after the first flight. Rick and I exchanged the camera and transmitter, the fuel tank was refilled and the G-62 was restarted. Rick got the Gee Bee off the ground quickly and smoothly and immediately after he got it turned around he began saying things like "…I like this plane…" He then began to fly the plane as if he had been flying it for years. Low sweeping high speed passes, great big loops, a few stall turns and even a few high speed pylon turns all turned out great. Rick kept saying that he liked the way the plane flew, plenty of power, smooth and graceful, gentle on the
controls and very stable. He did a pretty good touch and go, and then set up for his first landing. Rick then commented that the G-62 provides plenty of power and he thought a smaller 40cc gas engine would fly it pretty well too. Even though this is a Gee Bee, it is not one of those squirrelly little racing Gee Bee's that are a handful to land or take off. With the engine just a bit above idle speed, the Model Y floats down to a gentle landing every time. While Rick was taxiing the plane back to the pit area, he said that this was one of the best test planes he had flown in a long time. That just about summed up the entire test flight session for us.
Low Bandwidth High Bandwidth
9.42 MB 28.4 MB
Summary: The Pacific Aeromodels 2nd Generation 27% Gee Bee Senior Sportster is a large model with great lines and graceful flying characteristics. It assembles quickly and easily and can be powered by a wide range of power plants. It doesn't need any of those high dollar super fast and powerful servos and with a total weight less than 22 pounds, the wing loading is light enough to allow slow flight without any problems. It looks great in the air and on the ground. I have to agree with Rick's comment when he said "I like this plane!"
Pacific Aeromodel Mfg. Inc 12368 Valley Blvd. El Monte, CA 91732 www.pacaeromodel.com Phone: (800) 780-0100, Phone: (626) 618-0300 Horizon Hobby, Inc. 4105 Fieldstone Road Champaign, IL 61822 Phone: (800) 338-4639 Fax: (217) 355-1552 B & B Specialties 14234 Cleveland Road Granger, IN 46530 Phone: (574) 277-0499 DU-BRO PRODUCTS, INC P.O. Box 815 Wauconda, IL 60084 Phone: (800) 848-9411 Fax: (847) 526-1604
Great Planes (GPM)
Great Planes (GPM) 3002 N. APOLLO DRIVE, SUITE #1 CHAMPAIGN, IL 61822 Phone: 217-398-8970 www.greatplanes.com
Comments on RCU Review: Pacific Aeromodel 27% Posted by: homeboy61 on 02/03/2009 Profile Well ya know it looked like a beautiful plane and I bet it will float in on a hell of a lot calmer day good job and A NICE SAVE THERE GUYS!!!!!!! Posted by: EMB145CA on 02/07/2009 Profile Having the generation 1 version, I can tell you it is stable and solid during all regimes of flying. But, due to that large fuse, if you get slow, you will stall the wing and go in. I would also change to tires to something you can fill with air but left empty so the tires give a little on landings. Overall, one of my favorite airplanes in the fleet and everyone can't believe it's an ARF. Page: 1 The comments, observations and conclusions made in this review are solely with respect to the particular item the editor reviewed and may not apply generally to similar products by the manufacturer. We cannot be responsible for any manufacturer defects in workmanship or other deficiencies in products like the one featured in the review.
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