In the November 2013 issue of HPC, an alert reader spotted conversions errors. HPC’s editors performed absolute temperature conversions where relative temperature differences were under discussion. In the article titled “Ceramic-matrix composites heat up,” on p. 40, in the third column, last full paragraph, the story states the following:
“In jet engine propulsion history, the average rate of technology progress for turbine engine material temperature capability has increased 50°F/10°C per decade, according to GE. However, with the introduction of CMCs, GE believes it will increase material temperature capability by 150°F/66°C in this decade alone.”
The correct conversions should have been 50°F/28°C. and 150°F/83°C.
In our Focus on Design feature, “Compression molding mass out of aircraft interiors,” the incorrect conversion occurred p. 56, third column, first paragraph, second sentence:
“Some thermoplastics require temperatures as much as 100°F/38°C hotter than others, which adds time to the heating cycle.”
The correct conversion here should have been 100°F/56°C.
HPC’s editors regret the errors.