Former Member Posted November 12, 2009 Share Posted November 12, 2009 [This posting has been removed] Quote Link to comment Share on other sites More sharing options...
Paddy Fidling Posted November 12, 2009 Share Posted November 12, 2009 Posted by birdy on 11/11/2009 22:36:30:My ultrafly tutor doesn't like wind much ether, but I bet if you fitted a heavyer battery and changed to a 10 x 7 prop it would do a little better. I do need a new prop now, so that will be on the list, however i run it with a 3250maH 3Cell! Quote Link to comment Share on other sites More sharing options...
Paul Adams Posted November 12, 2009 Share Posted November 12, 2009 Its not the amount of wind that’s important, its the turbulence the wind creates as it goes over / around objects in its path. At my local field if the wind is right to left along the strip, I will fly in quite windy conditions as there is a large open area to the right. If however the wind is left to right, the wind tumbles over the trees to the left and the air is very turbulent making flying / landing very difficult. It also depends on your flying experience, I learn't to fly from a slope where you need the wind to keep the model up, and the more wind the more fun. So I find it strange when I am down the powered field when people say its too windy to fly, and I am still putting up my models. A couple of people I fly with have started putting up models in windy conditions and realise just how much fun you can have. Quote Link to comment Share on other sites More sharing options...
Myron Beaumont Posted November 12, 2009 Share Posted November 12, 2009 Polyfillasacked -Do you have a death wish ?Re- "my friend's the wind" - sounds like a lot of hot air to me . I can seriously relate to you though 'cos a few days ago I had another "op" on my mouth .Don't half hurt & on top of co-codamols I'm taking a few John Smiths Smooths 'cos I can't eat anything Quote Link to comment Share on other sites More sharing options...
Myron Beaumont Posted November 12, 2009 Share Posted November 12, 2009 PS Sorry I think I'm on the wrong thread Quote Link to comment Share on other sites More sharing options...
Biggles' Elder Brother - Moderator Posted November 12, 2009 Share Posted November 12, 2009 Its the JS Smoothies that do it Myron! Talking of which you must have a had good night last night Mr Polysuppafew What's all this guff about Richard Brandson's balloon in the jet stream and electric foamies? Lets suppose you did this eh? Well result...assuming said Capt of Industry's balloon is travelling at the same speed as the wind....foamy falls out of sky! The jet stream's doing umpteen mph, the balloon is doing the same, Polyfloatalong is also doing the same as a passenger in the balloon. Problem is, now so is the foamy. So, the foamy's ground speed is umpteen mph, but its airspeed is a big fat zero! Drag then kicks in the model slows, there is difference now and opps! more drag...and its a downward spiral - probably literally - and your foamy will soon dissapear at minus umpteen mph just like an empty crisp packet thrown overboard...and we'll have Polyflyaway Then we'll see how friendly the wind is! "The wind's my friend" indeed - I never did! You are spending too much time at altitude up on the Rock, its affecting you, you'll be posting pictures of flowers and hugging trees next BEB (Polynotatreehugger - and on no more than a nodding relationship with the wind!) Edited By Biggles' Elder Brother on 12/11/2009 14:07:58Edited By Biggles' Elder Brother on 12/11/2009 14:12:08 Quote Link to comment Share on other sites More sharing options...
Tim Mackey Posted November 12, 2009 Share Posted November 12, 2009 Not quite so BEB. Whereas I wouldn't start any discussion about serious aeronautical or aerodynamic sciences etc, as I am not qualified one little bit, I can assure you that we regularly "turn our foamys around into wind" - at up to 60MPH indeed - and watch them disappear IN FRONT of us. It takes some getting used to, and the right model of course, but I think you had better cadge a lift of mr polydrunkard ( when he's sober ) and get yerself up this big rock here and we proper fliers can show you how its done. You big girl Edited By Timbo - Administrator on 12/11/2009 14:12:52 Quote Link to comment Share on other sites More sharing options...
Biggles' Elder Brother - Moderator Posted November 12, 2009 Share Posted November 12, 2009 Ah, yes - the into wind thing was a bit of a red herring - so I took that out! See edit But at the end of the day you still have "drag vs thrust" and "lift vs weight" - can't escape Mr PolyNewton! BEB PS "You bIg girl"? Yes please if you've got one going spare Quote Link to comment Share on other sites More sharing options...
Myron Beaumont Posted November 12, 2009 Share Posted November 12, 2009 One thing I can't understand is why you would ever want to do "figure of 8's " hour after hour ? Quote Link to comment Share on other sites More sharing options...
Tim Mackey Posted November 12, 2009 Share Posted November 12, 2009 LOL.... none up the Orme I am afraid, unless this fine looking girl is on your wish list Quote Link to comment Share on other sites More sharing options...
Tim Mackey Posted November 12, 2009 Share Posted November 12, 2009 Posted by Myron Beaumont on 12/11/2009 14:19:37:One thing I can't understand is why you would ever want to do "figure of 8's " hour after hour ? Spoken by a true model flier...who has obviously never been sloping Quote Link to comment Share on other sites More sharing options...
Myron Beaumont Posted November 12, 2009 Share Posted November 12, 2009 True Timbo ! This is Ken's Gods own country- Newcastle . No Hills ! Quote Link to comment Share on other sites More sharing options...
Myron Beaumont Posted November 12, 2009 Share Posted November 12, 2009 PS Nevertheless I would love a 70" pointy thing & I think 'er indoors would buy one for me for Xmas I love the steamlined shape of the Jart Quote Link to comment Share on other sites More sharing options...
Myron Beaumont Posted November 12, 2009 Share Posted November 12, 2009 PSS Don't forget Timbo -We havn't all got an orme ('ome) to go to Quote Link to comment Share on other sites More sharing options...
Biggles' Elder Brother - Moderator Posted November 12, 2009 Share Posted November 12, 2009 Timbo,I 'm no expert you understand - but isn't "that fine looking girl" a bloke? Have you been at the sticky buns again? Me thinks Polymoderator is going to step in now and tell me I'm off topic! BEB Quote Link to comment Share on other sites More sharing options...
Tim Mackey Posted November 12, 2009 Share Posted November 12, 2009 A mere trivial detail biggles - it would still keep you warm at night Quote Link to comment Share on other sites More sharing options...
Myron Beaumont Posted November 12, 2009 Share Posted November 12, 2009 BEB Are you refering to the goat ? Does it matter if you;re wearing green wellies ? Quote Link to comment Share on other sites More sharing options...
Tim Mackey Posted November 12, 2009 Share Posted November 12, 2009 OK enough now guys, I think we, like the Orme goats, have strayed far enough - lets get back on topic. Quote Link to comment Share on other sites More sharing options...
Biggles' Elder Brother - Moderator Posted November 12, 2009 Share Posted November 12, 2009 Told you Quote Link to comment Share on other sites More sharing options...
Biggles' Elder Brother - Moderator Posted November 12, 2009 Share Posted November 12, 2009 Back to serious flying matters - this wind and balloon problem. I've been thinking about this and strange as it seems - very strange - I think Polysmartypants is right! You need to really shut out any consideration of the ground - and yes the plane should fly round outside the balloon despite the umpteen mph wind - some of the time it would actually be going backwards relative to the ground true - but not relative to the air. Interesting! I guess this how DSS works? BEB Quote Link to comment Share on other sites More sharing options...
Former Member Posted November 12, 2009 Share Posted November 12, 2009 [This posting has been removed] Quote Link to comment Share on other sites More sharing options...
Paul Adams Posted November 12, 2009 Share Posted November 12, 2009 I have often heard the argument about a model flying through a mass of air travelling at speed and that the only way the model reacts differently is caused by the viewpoint of the pilot, i.e. in relation to the ground, and it does not make sense. If you are flying a 2Kg model in a 5 meters per second (m/s) head wind with a model doing 10 m/s, the model is actually flying relative to the ground at 5 m/s. As such it has the kinetic energy of 1/2 x mass x speed squared = 25 Joules. If you now turn the model downwind, the model needs to fly at 10 + 5 =15 m/s, so the Kinetic energy required is 225 Joules. Hence why when you turn a model from flying upwind to downwind in windy conditions the model dives until it trades its Potential energy (height) to Kinetic Energy.Edited By Paul Adams on 12/11/2009 19:52:21 Quote Link to comment Share on other sites More sharing options...
Bruce Richards Posted November 12, 2009 Share Posted November 12, 2009 Quote from Wikipedia "The kinetic energy of a single object is completely frame-dependent (relative). For example, a bullet racing by a non-moving observer has kinetic energy in the reference frame of this observer, but the same bullet has zero kinetic energy in the reference frame which moves with the bullet." Surely what is important is kinetic energy with respect to the moving air mass. The only time kinetic energy with respect to the ground is important is when you hit it. Quote Link to comment Share on other sites More sharing options...
Paul Adams Posted November 12, 2009 Share Posted November 12, 2009 So why does a model dive when you turn down wind and climb when you turn it into wind? Quote Link to comment Share on other sites More sharing options...
Bruce Richards Posted November 12, 2009 Share Posted November 12, 2009 Paul, you may want to look at this thread where there is lots of discussion on that subject and more here.Edited By Bruce Richards - Moderator on 12/11/2009 20:31:46Edited By Bruce Richards - Moderator on 12/11/2009 20:35:58 Quote Link to comment Share on other sites More sharing options...
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