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Pop pop boats
Otherwise known as flash-steamers, hot-air-boats, toc-tocs or more accurately a Pulsating Water Engine (P.W.E.), the pop-pop boat originated in an 1891 British patent for the coil type water pulse engines by an inventor named Thomas Piot.The popularity of the boats spread quickly, however, and they were soon being manufactured in many countries.
In early publications, mention is made of a series of boats made in the early 20th century by the German toy makers Ernst Planck. In 1916 a US patent was granted to Charles McHugh for the diaphragm type engine. The German name for the boat, toc-toc, originated as a product brand name for a diaphragm-boilered boat in the late 1920's, while they have also been called put-put, phut-phut, and pouet-pouet boats elsewhere
There are two types of pop-pop engines. One is a copper tube coiled in the middle with both ends protruding from the rear of the boat. The other has two tubes connected to a boiler with a diaphragm that improves thrust and produces a popping sound.
The coil type boats are powered by a basic boiler comprising a thin coiled copper tube. The coils in the middle of the tube are positioned over a flame, which heats the water in the coils. The end of the tubes protrude from the back of the boat into the water. When the water boils, the expansion of the steam pushes the water out the tube at the back of the boat as a jet of steam, and the boat moves forward. After expansion, the steam cools to create a partial vacuum, sucking water back into the tubes to allow the cycle to begin again. It's that simple.
The diaphragm type engine is a slightly more sophisticated version which substitutes the coil with a shallow chamber with a flexible diaphragm for the coil. The flexing of the diaphragm gives a little more impulse to the escaping steam, as well as making a louder pop.
[/color][justify]A pop-pop boat is a toy with a very simple heat engine without moving parts, powered by a candle or oil burner. It was patented in the UK in 1891, but may have precursors dating to 1880. The name comes from the noise the boats make. Other names are putt-putt boat, crazy boat, flash-steamer, hot-air-boat, pulsating water engine boat. Around the world they may be called Can-Can-boot, Knatterboot, toc-toc, Puf-Puf boat, Phut-Phut, or Pouet-Pouet.
The heat engine of a pop pop boat is a steam boiler. Water in it flashes into steam, which pushes the slugs of water in the exhaust pipes propelling the boat by a pulse of water. The steam bubble then condenses slowly and this sucks water in. The key principle is that the water being propelled out the back of the boat is directional, but the water being sucked back in on the second half of the cycle is not a directional jet, but instead is sucked in roughly hemispherically, that is, from all directions equally. This asymmetry is what propels the boat forward.
Otherwise known as flash-steamers, hot-air-boats, toc-tocs or more accurately a Pulsating Water Engine (P.W.E.), the pop-pop boat originated in an 1891 British patent for the coil type water pulse engines by an inventor named Thomas Piot.The popularity of the boats spread quickly, however, and they were soon being manufactured in many countries.
In early publications, mention is made of a series of boats made in the early 20th century by the German toy makers Ernst Planck. In 1916 a US patent was granted to Charles McHugh for the diaphragm type engine. The German name for the boat, toc-toc, originated as a product brand name for a diaphragm-boilered boat in the late 1920's, while they have also been called put-put, phut-phut, and pouet-pouet boats elsewhere
There are two types of pop-pop engines. One is a copper tube coiled in the middle with both ends protruding from the rear of the boat. The other has two tubes connected to a boiler with a diaphragm that improves thrust and produces a popping sound.
The coil type boats are powered by a basic boiler comprising a thin coiled copper tube. The coils in the middle of the tube are positioned over a flame, which heats the water in the coils. The end of the tubes protrude from the back of the boat into the water. When the water boils, the expansion of the steam pushes the water out the tube at the back of the boat as a jet of steam, and the boat moves forward. After expansion, the steam cools to create a partial vacuum, sucking water back into the tubes to allow the cycle to begin again. It's that simple.
The diaphragm type engine is a slightly more sophisticated version which substitutes the coil with a shallow chamber with a flexible diaphragm for the coil. The flexing of the diaphragm gives a little more impulse to the escaping steam, as well as making a louder pop.
[/color][justify]A pop-pop boat is a toy with a very simple heat engine without moving parts, powered by a candle or oil burner. It was patented in the UK in 1891, but may have precursors dating to 1880. The name comes from the noise the boats make. Other names are putt-putt boat, crazy boat, flash-steamer, hot-air-boat, pulsating water engine boat. Around the world they may be called Can-Can-boot, Knatterboot, toc-toc, Puf-Puf boat, Phut-Phut, or Pouet-Pouet.
The heat engine of a pop pop boat is a steam boiler. Water in it flashes into steam, which pushes the slugs of water in the exhaust pipes propelling the boat by a pulse of water. The steam bubble then condenses slowly and this sucks water in. The key principle is that the water being propelled out the back of the boat is directional, but the water being sucked back in on the second half of the cycle is not a directional jet, but instead is sucked in roughly hemispherically, that is, from all directions equally. This asymmetry is what propels the boat forward.
Laatst aangepast door Collector op wo 26 jan 2011 - 21:13; in totaal 1 keer bewerkt