lml@lancaironline.net Mailing List Archive

On May 31, 2013, at 11:21 AM, Paul Miller wrote:

Colyn: I just re-read that article, Busch states:

(The head's tensile strength is reduced to 50% of its room-temperature value at a CHT of 400F, and to about 33% at 500F.)

I don't see that supported in any literature studying the properties of steel versus temperature. There appear to be small changes in elasticity,strength of a few percent in the range we fly in but it appears that big changes need to be in the 500-900C range. I'm not convinced that Busch is right on this one.

Paul

Legacy (cylinders currently at room temperature and high strength)

On 2013-05-31, at 7:21 AM, Sky2high@aol.com wrote:

I think Grayhawk posted a chart a while back that plotted cylinder strength vs. temp but I can't find it. I did find this article by Mike Busch in which he says that at 400 degrees the cylinder is half as strong as when cold and makes a number of other points about CHT's. http://www.avweb.com/news/savvyaviator/savvy_aviator_59_egt_cht_and_leaning_198162-1.html