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HeliTorque Forum Index » Flight Dynamics

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weekend warrior
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PostPosted: Fri Aug 05, 2005 10:16 pm    Post subject: . Reply with quote

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Last edited by weekend warrior on Tue Jun 06, 2006 2:48 pm; edited 1 time in total
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TripleDelta
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Location: Zagreb - Lucko (LDZL), Croatia


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PostPosted: Fri Aug 26, 2005 5:11 pm    Post subject: Reply with quote

Turbines are generally more environmentally friendly than pistons in terms of exhaust gas emission, since Jet A burns cleaner and doesn't contain the same anti-detonation components (in terms of quantity and composition) as 100LL.

However, concerning noise, most turbine helis will almost always be louder I think, because the higher power developed by the turbine requires a larger rotor to absorbe it and turn it into useful lift - and those can be noisy, especially if they have more than two blades.

Yet, as far as I have experienced, turbine helis that are more-or-less in a similar power range as pistons, are not all that louder. The MD500D is not that much louder than an R-44 (as far as I remember), given that the MD500 has a five-blade main rotor and almost 100 SHP more - and considering that the R-44s piston thumping is replaced by the turbine whine.
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