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"Why do I like the flatplate airfoil for indoor 3D airplanes? Good question. This is from the man him self, George Hicks This helps explain the terrific performance of all the IFO's, Shockflyers and 3dExtras. Flat plates have an advantage because at slow speed their lift/drag ratio is not only higher, but would be relatively constant regardless of speed. The key factor in the curved and flat plates is the fact that they are linear and their performance does not change with speed.Ī semi-symmetrical airfoil can give a nasty surprise when coming in for landing because the lift that it provides decreases not only because of the decrease in speed, but because of the decrease in lift/drag ratio at low speeds.įor tapered wings, the tips of a semi-symmetrical wing would stall first because of the decrease in Reynold's number at the tips.įor low aspect ratio wings the Reynold's number would be higher at low speeds. The lift/drag ratio for the curved and flat plate would be roughly the same as it was at the lower speed.
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For this model the curved plate and flat plate would provide more lift for the same drag.Īt low speeds curved plate and flat plate are best.Īt higher speeds (20 mph) the Reynold's number would be 124,800 and the semi-symmetrical would have a higher lift for the same drag. The formula for Reynold's number at sea level isĪ model with an 8" chord, flying at 10 mph would encounter a Reynold's number of 62,400.
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It turns out that at low Reynold's numbers (120,000), the lift/drag ratio of the semi-symmetrical has significantly improved, while the curved plate and flat plate remain roughly the same as they were at 40,000. If there had been a deposit on this packaging it would have been recycled instead of polluting our nature.There is an article in the February 1982 issue of Model Airplane News by Andy Lennon in which he plots the lift/drag ratios of various airfoils, including a flat plate, curved plate and semi-symmetrical. The solution is cheaper and faster: the introduction of a deposit on all beverage containers. So again, prevention is better than cure. It is nevertheless no solution for the pollution in the deeper parts of the ocean. The machine is able to clean the upper layer of the ocean. A can found at 950 m depth on the ocean floor.īuilding an Ocean Cleanup device is an expensive and time-consuming solution to collect waste out of the ocean.
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Research shows that waste is not always visible and causes harm: it has been found on the bottom of the deepest oceans. A glass bottle on the beach.Ĭardboard beverage packaging in the forest. Wouldn’t it be great if a deposit occurs on all beverage containers including beverage on cardboard, bags and cans. bottles and encouraging the use of refillable bottles.Ī great initiative, because as you maybe know plastic pollution is also harmful for the coral reefs. Merijn challenges everyone to contribute and sign the petition for the extension of deposits on 500 ml. This “Message on a bottle” is specifically to draw attention for plastic bottles polluting the environment. A trip of 178 km! They made it, unfortunately not in the time they had hoped for. The board is again made of plastic litter. His idea is to cross the North Sea form the Netherlands to England on a kite surfboard with a homemade hydrofoil. Merijn Tinga, the plastic soup surfer, in the waves. bottle, he did something nobody has done before… Again on a homemade surfboard now in the form of a 500 ml. This year, he took on a new challenge, one for the Guinness Book of Records. He surfed along the Dutch coast last year on a surfboard made of plastic litter. One of those people is Merijn Tinga or the Plastic Soup Surfer. There are people who draw attention to environmental problems in an exciting way.
![Airfoil surfboard](https://loka.nahovitsyn.com/6.jpg)