Actually, the 37deg. ftg Does put a little more pressure on the mating
surfaces.---Envision a 10 or 15 deg fitting, like forcing a long tapered
pin into a long tapered hole--fits real tight.----And that's exactly what
the
newer line of MS hoses does---I haven't measured the angle but it looks
on the order of 2 to 5 deg. This gives a very tight fit and still uses
aluminum
mating parts. The downside, if any, is that the mating pieces must be
machined
to very close tolerances, or the "plug" will bottom out in the socket
before
the tapers come into contact. Jerry

Ernest Christley wrote:

The most recent Sport Aviation has an article on make up hoses. The
author states that 'you must use 37 degree fittings' and as is typical,
gives no reason why. Is there a reason for this that involves the laws
of nature, vs the "laws of the FAA"?

--
http://www.ernest.isa-geek.org/
"Ignorance is mankinds normal state,
alleviated by information and experience."
Veeduber