The cheapest is the T-409 a stainless alloy made for exhaust systems.

Ed

----- Original Message -----
From: Tracy Crook
To: Rotary motors in aircraft

Sent: Saturday, February 24, 2007 9:31 AM
Subject: [FlyRotary] Re: Hushpower II



I used the one that was cheapest, can't remember the alloy.   The more
expensive one could be polished to a mirror finish (who cares) and that was
the only advantage as far as I know.  I used 2.25" inlet & outlet.  It's
still working fine and has all its guts after > 300 hours.

Tracy

----- Original Message -----
From: John Downing
To: Rotary motors in aircraft
Sent: Friday, February 23, 2007 2:59 PM
Subject: [FlyRotary] Hushpower II


Tracy, I see in the catalog that the Hushpower II comes in T-304 and T-409,
which is the most desirable.  My old metals book isn't very clear and from
the ad it appears that the T-304 may be the better one as the T-409 is
aluminized.  JohnD  Thankyou