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Guillows Series 900 - Chipmunk by John Cooper. Viewed 1778 times. Build Thread   Click image to return. Image Comments John Cooper 09-Dec-08 10:17 This Chipmunk weighs about 10g (without rubber), after some modifications and flies quite well. poppy 09-Dec-08 11:09 Wow, A nice model and it flies!! jgood 09-Dec-08 19:44 wow, very nice indeed. Tell us more! John Cooper 11-Dec-08 08:19 To keep the plane light, I made the tail out of 1/16 square contest balsa. I also replaced the center section of the canopy with a very thin piece of acetate. Here is a video of the plane flying. I was lucky that, after hitting the gym ceiling twice, the plane didn't crash. http://www.youtube.com/watch?v=TnImIsE_Gyc Luke War 11-Dec-08 09:47 Geeze man you man some great flying models! While watching your video I was starting to wonder if that Chipmunk would ever come down from the ceiling...great flight time in my opinion. hjlittman 11-Dec-08 11:19 Great trimming! You got that nice, tight turn without it torque rolling at launch or spinning when the motor ran out. That one is dialed in just right! How much rubber is in it? John Cooper 11-Dec-08 15:49 Thanks, it took a bit of fiddling with the thrust line to get it to turn proerly, under power. It is powered by one 1/8 inch loop of Tan II rubber that is about 14 inches long. I put in about 1000 turns, for the flight in the video. One problem with a long piece of rubber is that you can get too many knots in the rear, in mid-flight, making it tail heavy. This is why it was stalling slightly, half way through the flight. Creosotewind 11-Dec-08 18:48 Love seeing it in the air. Great model and a great video. hjlittman 12-Dec-08 20:09 Had the same problem. All the 900 series kits are a little tight in the motor peg area. Many people move the motor peg forward on Guillow's kits. Haven't built the Chipmunk, but the Typhoon, and Skyraider are outstanding fliers, but I've never been able to trim one that tight. Please sign in to comment on this image.