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Anyone know what this is? (Read 592 times)

Reply #15 - Nov 28^th, 2005 at 7:27am

Ivan Offline
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No, I'm NOT Russian, I
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Quote:

Also, I am not sure, but I am pretty sure turbofans run at a must higher RPM than turboprops do. This engine is not really a turboprop, but a turbofan, not inside a duct.

Internals run the same speed. it's the prop that has the reduction box.

Russian planes: IL-76 (all standard length ones), Tu-154 and Il-62, Tu-134 and An-24RV&&&&AI flightplans and repaints can be found here

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Reply #16 - Nov 28^th, 2005 at 8:03am

C Offline
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Earth

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Quote:

Also, I am not sure, but I am pretty sure turbofans run at a must higher RPM than turboprops do. This engine is not really a turboprop, but a turbofan, not inside a duct.

Did a little research on this point. Looking a the RPM of the main compressor of a Rolls Royce Trent, it has a max of about 10,000rpm, with the fan rotating at about 7,500.

Looking at a Turboprop example, the Garrett TPE331 has a rotational speed of 40,000rpm, with a propeller speed of 2,000rpm.

Generally, the smaller the engine, the higher the RPM...

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Reply #17 - Dec 5^th, 2005 at 9:10pm

bbstackerf Offline
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Hagar has the answer. The unducted fan delivered a 30% increase in efficiencyover the ducted fans, but they could not get the noise level under the guidelines established around most urban area airports.

Lets build a better engine so we can have the same people who gash about fuel and pollution make it impossible to use because it's too noisy. Roll Eyes