airframe structural analysis

[nik.kruhmin]

After studying the plans and seeing a few completed planes, I have some sketches of a highly Sonerai influenced, albeit new design. Imagine a Sonerai I low wing with the pilot leaned back an additional ~10 degrees and the cockpit sectioned to keep the top frame rails in the same position relative to the pilot's head.. Anyway, with these changes I want to make sure its structurally sound. I'm a MechE by education, and could run a simple FEA on it or even do a full analysis in ProE/Mechanica. I need help in knowing what loads the airframe has to withstand. For example, pulling 6G, in pitch only, what loads does the nose and tail see? How is engine torque transferred though to the frame? What are good assumptions? Is there any good books on this subject?

Thanks,

Nik

 

[Schmleff]

Someone had done a structural analysis of a plans built SI. Might have been on the old Yahoo list.

There is still the question as to whether the wash from the wing would mute the tail during nose high operations. That has been discussed at length on this site and others.

 

[DaveWilcox]

FAR part 23 is a good starting place.

http://www.flightsimaviation.com/data/FARS/part_23-333.html

 

[oahupilot]

Airframe Structural Design
Michael Niu;

Aircraft Design : A Conceptual Approach
Daniel P. Raymer

If you want a more watered down version

simplified aircraft design for homebuilders
Daniel Raymer

6g is just a reference for nominal acceleration(not tangential acceleration) of a body during a rotational motion.

 

[nik.kruhmin]

Thanks! I've begun studying Part 23 and found out my Universities library has those books.

 

[phzabriskie]

Hummmm.....I've got a big University library about 2 blocks away, I'll take a walk.
-Pete

 

[ZOOMY 88]

John Monnett had a structural analysis done on the S1 back in the 70's. You might want to contact him. After the analysis was completed, he eliminated one bay in the tail because it was so overdesigned...................z88