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Thank you for your welcome and the link as well.Welcome to the site.
Have you seen that thread?
Mechanism for the control surfaces of the B-29
Hello, I'm wondering how the control surfaces of the B-29 were operated. They were mechanic or hydraulic?ww2aircraft.net
Ok bad news..... but i'am optimistic that somebody will come around with a solution for my "problem"I see. Unfortunately the guy was banned years ago.
Thank you for those nice drawings, but the "problem" still persist. The tab trim rod is installed inside the elevator surface, that means it can not act as an servo tab.Here are two diagrams from the B-29 engineering drawings for the elevator setup and the elevator tab setup. Bear in mind that all control surfaces on the B-29 were covered with fabric. So they would be somewhat easier to move than metal clad units.
Sounds like a plan, one of the CAF engineers should know how the elevator works.Maybe the simplest solution to your question would be to contact the FiFi folks or the Doc folks and see if you can talk to one of the pilots who fly the aircraft.
All those measurements to balance the elevator forces (hingeline) are common practice at this era. But i still have doubts, because aircraft of compareable size and weight need to have balance tabs or springforced tabs additionally. And a lot even smaller(P-61, F4U) used this kind of "power aid" for their flight controls.Here's some additional info on the elevator.
The elevator hinge is about 1/3 of the way down from the its nose to its tail. So when the elevator is moved up, 2/3 is above the tailplane and 1/3 is below the tailplane. The below part should unload the pilot effort somewhat. The areas of the elevator are approximately: 2/3 - 79 sq ft (this includes the elevator tab of 10 sq ft); 1/3 - 36 sq ft. This is the total of both sides. The thickness of the tailplane will change these somewhat as far as the relative wind is concerned. The elevator limits are: 25 degrees up, 15 degrees down.
The pilot's control column is also a simple lever, and it's different arm lengths should give him a mechanical advantage when moving the elevator.