| 摘要 |
The invention relates to an improved air heater for a hot air balloon. The heater comprises a plurality of burners MC1 etc. of generally tubular cylindrical form each with division means 13, etc. within it to give a division of a combustible atmosphere formed at the burner during use generally with a mixture of propane and air and each having a gas jet J, etc. The heaters may produce 10<7> Btu/hr with a low noise level. Two constructions of burner are described, one an open tube having a foraminous wall and containing within its bore an obturator having at least two spaced apart foraminous members 13, Fig 2, and the other Fig. 7, an open tube supporting substantially concentrically two axially spaced apart members providing a partial constriction to its bore from which divided streams of gas and air emerge and when ignited form a stable flame. <IMAGE> |
