> An interesting observation. Verrrrry Interrrrrresting! At 59000 feet, probably through the Tropopause and near or into the Stratosphere, I calculate about 2"Hg (Standard) and an OAT of about -50C. BTW, how does 100LL interact with an ozone component? Do I need an oil cooler there? By Walter's power chart, 2500 RPM, 3-4" MAP is about 1% power. As Gary said, perhaps over extrapolated. How does a prop work up there? OK, I guess since B-29 was at 47000 in 1946 and Bohanon expects his blown RV to make it to 50000 (he maintains sea level power thru 25000). Grayhawk -------------------------------1103820518 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

In a message dated 12/23/2004 8:40:26 A.M. Central Standard Time,=20 glcasey@adelphia.net writes:

<= FONT=20 style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000=20 size=3D2><<In reviewing the WOT performance curves for O-360-A, I no= te=20 that they
converge to 0 power at 59,000 ft. This would equate to around= =20 0.24 inHg at 0
C.>>

An interesting=20 observation.

Verrrrry Interrrrrresting!

At 59000 feet, probably through the Tropopause and near or into the=20 Stratosphere, I calculate about 2"Hg (Standard) and an OAT of about=20 -50C. BTW, how does 100LL interact with an ozone component? Do I= =20 need an oil cooler there? By Walter's power chart, 2500 RPM, 3-4" MAP=20= is=20 about 1% power. As Gary said, perhaps over extrapolated. Ho= w=20 does a prop work up there? OK, I guess since B-29 was at 47000 in 1946 and=20 Bohanon expects his blown RV to make it to 50000 (he maintains sea level pow= er=20 thru 25000).

Grayhawk

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