### Stress calculations

Posted:

**Sat Feb 16, 2008 5:15 pm**I used to have a PPL, now grounded due health.

Current interest is large R/C aircraft, and I'm working on designing a large model from scratch. To that end I'm reading "Stress without tears" by Tom Rhodes. If anybody is familiar with the book could you please tell me whether his answer to the problem set in chapter one (i.e. 27 lbs) is correct. I get 25 lbs and fail to see his logic for his answer.

HELP PLEASE, anybody.

Current interest is large R/C aircraft, and I'm working on designing a large model from scratch. To that end I'm reading "Stress without tears" by Tom Rhodes. If anybody is familiar with the book could you please tell me whether his answer to the problem set in chapter one (i.e. 27 lbs) is correct. I get 25 lbs and fail to see his logic for his answer.

HELP PLEASE, anybody.