Tony Jones Posted November 17, 2011 Share Posted November 17, 2011 In 'Go with the Flow on p99 of the December issue Brian Winch writes: 'We now call on the services of Sir Isaac Newton and his theories on force and motion. If your model is flying very fast, the weigh increase in the fuel in the tank - being pushed back by the model's forward motion - is so considerable....' Should Mr Winch call on Mr Newton to seek his advice, I suspect that he will find him a charred ember with burned out bearings from revolving at excessive rpm. But then what do you expect from someone who thinks the correct abbreviaion for carburretor is 'carby'? Best wishesTony Jones Quote Link to comment Share on other sites More sharing options...
John Privett Posted November 18, 2011 Share Posted November 18, 2011 Oh dear, I wish he'd stick to writing about things he does understand. Physics is clearly not one of those. He wrote pretty-much the same thing in his column about a year or so ago too. Quote Link to comment Share on other sites More sharing options...
Tony Jones Posted November 18, 2011 Author Share Posted November 18, 2011 And I wish I knew how to spell carburettor.....RegardsTony Jones Quote Link to comment Share on other sites More sharing options...
Stefan Hafner Posted November 18, 2011 Share Posted November 18, 2011 Do you mean carburetter ??? Quote Link to comment Share on other sites More sharing options...
Martin Harris - Moderator Posted November 18, 2011 Share Posted November 18, 2011 A carburetor (American spelling), carburettor, or carburetter (Commonwealth spelling) is a device that blends air and fuel for an internal combustion engine. It is sometimes shortened to carb in North America and the United Kingdom. Quote Link to comment Share on other sites More sharing options...
Tony Jones Posted November 18, 2011 Author Share Posted November 18, 2011 That's the one. RegardsTony Quote Link to comment Share on other sites More sharing options...
Brian Parker Posted November 18, 2011 Share Posted November 18, 2011 Even if we can’t agree on the correct spelling for Carburetter/ Carburettor, it’s necessary to distinguish between Mass and Weight. Consider this, If a can of fuel of mass ‘M’ is suspended on a spring balance in a true free falling aircraft the spring balance will record zero weight, the fuel is apparently weightless. Quote Link to comment Share on other sites More sharing options...
Ben B Posted November 18, 2011 Share Posted November 18, 2011 Oh dear! Bit of a mistake there eh? There's a fundamental difference between speed and acceleration. If a plane was travelling at 99.99% of the speed of light (IE pretty fast ) but decelerating it's fuel would be all over the front of the fuel tank. Equally a plane travelling at 0.01mph but accelerating would have the fuel on the back wall as he describes.Speed is irrelevant. He was almost right though- Newton's theory's of momentum and inertia nicely explain the phenomenon being observed. But all momentum and inertia is relative (consider Einstein's lift for a moment).If you want a nice example of how momentum is relative consider this situation. A r/c plane is flying into a head wind with forward speed equal to the airflow backwards (IE it is not moving forwards of backwards). If you chop the throttle the plane will slowly start accelerating backwards in the airflow. The acceleration shows that the plane had momentum relative to the airflow. However if you reached up and grabbed the plane (obviously not recommended) you would feel no "momentum". So does it have momentum or not? Answer is yes and no depending on what you compare it to Quote Link to comment Share on other sites More sharing options...
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