[DeTomaso] FW: NPC Probably not new to you aeroheads but wow-

[MikeLDrew at aol.com]

In a message dated 6/17/15 13 05 11, gow2 at rc-tech.net writes:


> Usually the propeller.
> 

>>>...although for perverse reasons, light aircraft never, ever have 
mufflers on the exhaust system.   I think this is incredibly stupid.   Yes, 80 
years ago mufflers may have compromised performance, but now we know enough 
about exhaust design that it's possible to fit effective mufflers that have 
hardly any negative effect, if at all.   I think it's simply ancestor worship 
that prevents the airplane community from embracing them--that and perhaps 
FAA intransigence and fear of change.

That said, many propellers spin so fast that the tips are exceeding the 
speed of sound and thus generating tiny sonic booms on a continual basis, and 
no muffler in the world will overcome that!

And yes, prop planes are ridiculously loud inside, which is why everyone 
aboard has to wear heavy-duty industrial ear protection.   Come to think of 
it, the headset manufacturers might have a hand in keeping airplanes loud too!

Mike
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   In a message dated 6/17/15 13 05 11, gow2 at rc-tech.net writes:

     Usually the propeller.

   >>>...although for perverse reasons, light aircraft never, ever have
   mufflers on the exhaust system.  I think this is incredibly stupid.
   Yes, 80 years ago mufflers may have compromised performance, but now we
   know enough about exhaust design that it's possible to fit effective
   mufflers that have hardly any negative effect, if at all.  I think it's
   simply ancestor worship that prevents the airplane community from
   embracing them--that and perhaps FAA intransigence and fear of change.
   That said, many propellers spin so fast that the tips are exceeding the
   speed of sound and thus generating tiny sonic booms on a continual
   basis, and no muffler in the world will overcome that!
   And yes, prop planes are ridiculously loud inside, which is why
   everyone aboard has to wear heavy-duty industrial ear protection.  Come
   to think of it, the headset manufacturers might have a hand in keeping
   airplanes loud too!
   Mike