stankap
Member
Another question to stir up some thoughts.
In most aircraft design texts it shows the typical 60deg/30deg unstable air profile for the leading and trailing edges of the horizontal stabilizer relative to the vertical stabilizer/rudder. The point of the diagram is in correctly locating the horiz stab to keep a portion of the rudder surface outside this area in the clean airflow.
My questions is this.
Most aircraft designs I see do not take this into consideration and some are spinable and recoverable. During my instructor training we did spins in the C-150 and recovered fine, but in looking at the C-150 tail design the rule above does not look like it applies to the cessna design.
Also,
I read in several texts that a flat bottom on the fuselage aft of the cockpit actually will make it more difficult to get out of spins, yet I see more designs than not with this sort of aft fuselage geometry. Is it OK or not?
Thanks,
Stan
In most aircraft design texts it shows the typical 60deg/30deg unstable air profile for the leading and trailing edges of the horizontal stabilizer relative to the vertical stabilizer/rudder. The point of the diagram is in correctly locating the horiz stab to keep a portion of the rudder surface outside this area in the clean airflow.
My questions is this.
Most aircraft designs I see do not take this into consideration and some are spinable and recoverable. During my instructor training we did spins in the C-150 and recovered fine, but in looking at the C-150 tail design the rule above does not look like it applies to the cessna design.
Also,
I read in several texts that a flat bottom on the fuselage aft of the cockpit actually will make it more difficult to get out of spins, yet I see more designs than not with this sort of aft fuselage geometry. Is it OK or not?
Thanks,
Stan