| 31. | Lower fuel consumption that comes with high bypass ratios applies to turboprops, using a propeller rather than a ducted fan.
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| 32. | Owing to the low specific thrust, the bypass ratio for the engine is higher than normal for a military turbofan.
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| 33. | A modest fan pressure ratio, consistent with the high bypass ratio, meant a low fan tip speed could be employed.
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| 34. | Although high turbine inlet temperatures are often employed, the bypass ratio tends to be low, usually significantly less than 2.0.
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| 35. | The larger fan and higher bypass ratio need a low-pressure turbine with two more stages; the engine will be heavier.
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| 36. | A smaller core flow / higher bypass ratio cycle can be achieved by raising the ( HP ) turbine rotor inlet temperature.
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| 37. | Turboprops such as the PT6 and PW100 may have a bypass ratio over 50, although propeller airflow is slower than for turbofans.
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| 38. | Certainly, a major factor would have been that no manufacturer was producing a 13000 lbf-thrust-class high bypass ratio turbofan engine at the time.
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| 39. | In the Mixed-Flow Turbofan with Ejector concept, a low bypass ratio engine is mounted in front of a long tube, called an ejector.
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| 40. | The latter is significantly improved over the original PS-90A power plants . and features a unified twin-spool turbofan with a high bypass ratio.
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