From: utzoo!decvax!harpo!floyd!vax135!ariel!houti!hogpc!houxm!ihnp4!ihuxr!lew
Newsgroups: net.physics
Title: planetary tunnels
Article-I.D.: ihuxr.397
Posted: Fri Apr 15 16:52:46 1983
Received: Mon Apr 18 23:54:52 1983

The crushing pressure of granite is about 30,000 psi and its specific
gravity is 2.7. This information allows us to calculate the maximum
size of a granite planet, through which one can drill a hole. Using
my "one half rho gee ar" formula, I get an upper limit on the radius
of about 450 km. This corresponds to a g-value of .34 m/sec2.

Ceres has a radius of 370 km, so it would make a nice practical
test case for a sane, sober, and serious net.project.

	Lew Mammel, Jr. ihuxr!lew