Czary
New Member
Posts: 2
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TSR 2
Aug 4, 2007 13:18:05 GMT -5
Post by Czary on Aug 4, 2007 13:18:05 GMT -5
Hello, I'm new to this forum but hope to get some useful opinion. I would like to build TSR2 as a slope soarer, but I'm afraid that it wouldn't fly good. If the model is to be 1/10 scale it means that it would be 2.7 meters long and only 1.1 m of wingspan. For me it just doesn't looks to good. Any opinion welcome. Kind regards.
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TSR 2
Sept 21, 2007 15:29:06 GMT -5
Post by Phil Cooke on Sept 21, 2007 15:29:06 GMT -5
Hey Czary, Sorry for slow response, the forum doesnt seem too active at the moment?! You are right to have concerns with such a design, but that doesnt mean that with a bit of thought and clever design and build you cant have success with a TSR2 on the slope! Many similar designs have been modelled and flown successfully (by similar I mean long, sleek aircraft with short, stubby wings - such as the Jaguar, the Voodoo and even the Starfighter!) If asked to explain, I would say the trick is 3 fold; 1/ Increase the area of the wing, 2/ keep overall weight down and where necessary, 3/ reduce the fuselage cross sections to minimise drag. 1/ If you increase the span by say 15% but then also increase the chord in proportion whilst maintaining the correct sweeps etc you retain the overall appearance of the scale full size wing, it is amazing how far you can push this on certain designs before the eye says "thats clearly grossly out of scale" - so the first thing to do is work out what wing area increase you can live with (im sure a true scale TSR2 would be a non starter due to low wing area and resultant high wing loading as a glider) But by following the span/chord/sweep idea you could probably quite easily double the wing area before it starts to look daft. 2/ Build lightly, use soft materials where poss only moving to medium or hard balsa where absolutely neccessary - remember PSS models dont suffer from any vibration due to IC motors and dont need to carry heavy weights like battery packs on EDF models, so strength (and thus weight) can be safely reduced accordingly during the build. 3/ Cross sectional areas, particularly on structures like TSR2 air intakes - should be narrowed in section, again you can do this a fair amount and still trick the eye to think its correct, but the benefit in reduction of drag is vast. Combining these 3 design criteria to the right degree should see any model in with a chance on the slope. Saying all that, I have built an F111 with a scale wing and a F-18 with a very near scale wing (see gallery) - both flew well, but only in the right conditions (20mph winds or higher) so they were not every day models, and PIGS to fly when the lift was marginal (<15mph) so i was often grounded whilst everyone else played happily... in my frustration, I built a 115% scale wing for the F-111, it worked MUCH better, right up until I had a massive mid air collision!! hehehe Hope this helps and inspires - would love to see your finished plans!!! Phil Cooke
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Czary
New Member
Posts: 2
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TSR 2
Sept 29, 2007 13:12:54 GMT -5
Post by Czary on Sept 29, 2007 13:12:54 GMT -5
I'd like to stay with 100 % original dimensions. Another thing I'd like to do is to build fiberglass fuselage for this beast - I've foud some interesting example how to divide plug and build some molds - su22m4.free.fr/tsr2.htm - that's 1/48 scale TSR-2 vacuformed model, but gives me some inspiration how I should start my project. Couple of weeks ago I recieved the "Composite Molding Made Easy DVD" - there are very good and time saving ideas how to build molds without spending long weeks or months on them. Thanks for the reply
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