Bill Reed Posted September 30, 2019 Share Posted September 30, 2019 Should a TE on a "funfly" be knife edge sharp? This will sound worse than it is BUT my build which is not flat bottomed sort of undulates along the wing. I think its a slight variation in ribs .I did not see it when I glued the top TE strip on. when I glued the very rear "wedge" that's sandwich between the strips I se it then. Its straight ,no banana bends JUST wavy!!!! Quote Link to comment Share on other sites More sharing options...
bert baker Posted September 30, 2019 Share Posted September 30, 2019 On the Panic the edges are just square Limbo dancer and my Fusion are also square Quote Link to comment Share on other sites More sharing options...
Bill Reed Posted September 30, 2019 Author Share Posted September 30, 2019 Sorry I might not have stated clearly, if I look along the TE its not ruler straight. it has some waviness. Wanted to know if this is "unacceptable" OR " s**t happens, live with it" Quote Link to comment Share on other sites More sharing options...
gangster Posted September 30, 2019 Share Posted September 30, 2019 Bill You are going to get all sorts of answers on this one. My opinion is yes I know it should be straight but hey get out there and fly it. You will also get profound theory’s why it’s wrong from a range of people from good modellers with a good knowledge of theory to those armchair theorists who always seem to be the ones who have trouble flying their models but believe they know why. My Gangster lite has warped in many ways still flys well but is getting a shade embarrassing to fly in day light. The trailing edge has gone wavy like yours in the space of the last 6 yesrs Quote Link to comment Share on other sites More sharing options...
Don Fry Posted September 30, 2019 Share Posted September 30, 2019 No one will notice. Neither will the plane, unless you are a REALY good flyer. Quote Link to comment Share on other sites More sharing options...
Peter Miller Posted September 30, 2019 Share Posted September 30, 2019 So long as the wing is not warped or twisted like a propeller a wavy TE is not a problem Quote Link to comment Share on other sites More sharing options...
gangster Posted September 30, 2019 Share Posted September 30, 2019 Right you have it from the master. Now this is what you do. Think of a non existent aerodynamic problem and attribute The theory to a fictional German scientist Now make up an equally fictional aircraft that just did not make it into production as ww1 ended. Or.... someone may we’ll be on here before the day is out with details of a real plane with a wobbly te Quote Link to comment Share on other sites More sharing options...
Martin Harris - Moderator Posted September 30, 2019 Share Posted September 30, 2019 A friend built a main plane that was more akin to a propeller than a wing for his DH71. After discussing the merits of rebuilding the wing, we wound on a significant aileron deflection to counteract it before I test flew it for him. It rolled with the twist immediately after take off and after winding in all the available trim, it still needed to be held level. We put in even more deflection for the next flight and I managed to trim it out OK. It's a scale/sport model, not a competition aerobat and to be quite honest, there's no reminders of the ridiculous aileron "neutral" positions once its in the air. When you think of some of the ridiculous contraptions that we manage to fly e.g. lawnmowers, flying saucers, Supermen, the finer points of aerodynamics at our Renold Numbers are far less significant than for the latest airliner or fighter! Quote Link to comment Share on other sites More sharing options...
Nigel R Posted September 30, 2019 Share Posted September 30, 2019 How wavy is it? If you need whole inches to measure the wave then maybe a problem. Otherwise just go fly. Quote Link to comment Share on other sites More sharing options...
Don Fry Posted September 30, 2019 Share Posted September 30, 2019 Posted by gangster on 30/09/2019 15:51:57: Right you have it from the master. Now this is what you do. Think of a non existent aerodynamic problem and attribute The theory to a fictional German scientist Now make up an equally fictional aircraft that just did not make it into production as ww1 ended. Or.... someone may we’ll be on here before the day is out with details of a real plane with a wobbly te Thank you very much. What payment is required. Quote Link to comment Share on other sites More sharing options...
john stones 1 - Moderator Posted September 30, 2019 Share Posted September 30, 2019 Fly it, rest of us do with our wobbly/wavy creations. Quote Link to comment Share on other sites More sharing options...
Robin Colbourne Posted September 30, 2019 Share Posted September 30, 2019 If you want to see wavy, take a look at the trailing edges on a Schleicher ASK-13 glider (commonly known as a K13); most gliding clubs have at least one, and the trailing edges on the majority of them look like a contour profile for rollercoaster. Even so, K13s fly very nicely! Bill, provided the waviness balances out it should be fine. Quote Link to comment Share on other sites More sharing options...
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