John Cooper's Rubber Powered Freeflight Page 5

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Grumman SBC-3 Helldiver This is a large and heavy Dumas kit that I have been lucky enough to get to fly indoors, without breaking it. It is covered with blue Japanese tissue that has been airbrushed.  The insignia are from white tissue that has been printed from a laser printer. Video wingspan: 76cm weight: 107.8 g without rubber power: 2 strands of 1/4 inch design: Dumas Kit built: 2010 -----------------------

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Lobet Ganagobie G03 I obtained this model, in partially completed form, from a talented club member, Mike Kent. Mike has passed away, and I thought it would be fitting to complete it.  It has turned out to be an excellent flier.  wingspan: 13" weight: 6.6 g without rubber power: 1 strand of 1/16 inch design: Peck Polymers built: 2009 -----------------------

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Douglas AD-1H Skyraider This is another Guillows 900 series kit, again with most of the wood replaced with contest balsa and with much thinner dimensions. Like all of the planes I have built from this series, it flies quite well .  Video wingspan: 41 cm weight: 17.8 g without rubber power: 1 strand of 1/8 inch design: Guillows built: 2009 -----------------------

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North American T28D Trojan The Trojan is built from a Guillows kit, with most of the wood replaced with contest balsa and with much thinner dimensions. I was disappointed with the heavy two piece canopy that required a very visible lateral seam. I replaced this canopy with my own plunge molded canopy. The plane is trimming really well, like the other 900 series kits I have built. It was quite easy to get it to circle a large gym twice for about a 25 sec flight . Video wingspan: 41 cm weight: 14.0g without rubber power: 1 strand of 1/8 inch design: Guillows built: 2009 -----------------------

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Albatros W4 The Albatros W4 features a 1/32 sheeted fuselage, to simulate the plywood of the full sized plane. I stained the balsa, before assembly, so that the glue would not affect absorption of the stain. Even though the floats look like a hindrance to good flying, they allowed me to use a light prop and still have a balanced model, by putting a small amount of lead in the tips of the float.  The plane is very stable in its right hand turn and is getting flights of around 30 sec. Video wingspan: 46 cm weight: 17.5g without rubber power: 1 strand of 3/16 inch design: John Cooper built: 2008 -----------------------

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Hawker Typhoon This plane is build from the Guillows 900 series. I really like this series of kits, because for a scale Guillows kit, it has the most potential for being built corectly and flying well. My major modification was to make all wing ribs half thickness, for better efficiency. I can get close to a 1 min flight, indoors, with the Typhoon. Video wingspan: 46 cm weight: 16.9g without rubber power: 1 strand of 1/8 inch design: Guillows built: 2008 -----------------------

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Junkers Ju87 Stuka This plane is build from the Guillows 500 series. I tried to build it light as possible as I knew that this plane would be difficult to trim. It simply does not fly well in the gym. I can make it fly straight fairly well. As soon as I add some rudder, it will either spiral or stall. I gave up trying to trim it as it looked like I would damage it with too many crashes. ` wingspan: 40 cm weight: 17.3g without rubber power: 1 strand of 1/8 inch design: Guillows built: 2008 -----------------------

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Curtis P6E Hawk The Hawk was built from a Comet plan from the 1930s. For reasons of nostalgia, I kept the simple and inaccurate details of this simple dime scale model. The major change I made to it was using thinner balsa wood. The plane flies well with flights around 40 sec in the gym. wingspan: 40 cm weight: 10.3g without rubber power: 1 strand of 1/8 inch design: Comet built: 2008 -----------------------

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deHavilland Canada DHC-1 Chipmunk The Chipmunk is a 900 series Guillows kit that has flown well from the beginning. I made the plane lighter by using very thin acetate for the canopy and by using 2/3 less balsa wood in the tail. One weak point of the kit is attachment of the wings to the fuselage, simply by butting. This works OK if there if the landing gear can be kept off (like the Typhoon). However, with fixed gear, this puts too much stress on the joints. Video wingspan: 46 cm weight: 11 g without rubber power: 1 strand of 1/8 inch design: Guillows (modified) built: 2008 -----------------------

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Cessna 180 This plane is from the plans on Paul and Ralph Bradley's site www.parmodels.com The model can be put together very quickly. The model is obviously well designed and was flying well after minutes of trimmming. Changes I made to the plans were a nose block that slides into the fuselage and the use of 1/32 balse for the wing. Video wingspan: 52 cm weight: 11 g power: 2 strands of 1/8 inch design: Carl Goldberg built: 2007 -----------------------

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