Richard
Final Approach
- Joined
- Feb 27, 2005
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- 9,076
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- West Coast Resistance
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Ack...city life
In Diana's, California Acro, thread, Lance made the following statement WRT execution of hammerhead stalls:
"I'm not sure what you're hitting on the way down, but it can't be your wake as none is generated on a vertical climb (no lift)."
Something about that just doesn't sit well with me. I'm thinking if the wing is not producing lift because it's past CL max the wing must be in the stalled condition where all airflow has separated from upper wing. Yes, I recognize the maneuver is a stall but the stall doesn't occur until at or nearly at the top of the vertical climb. The stall could not begin before that point otherwise it would prevent the vertical climb in the maneuver. So the a/c is in a vertical climb and still producing lift until the stall.
Therefore, the wing is not stalled until that point and is producing lift. Would not any application of any amount of forward stick in the climb be an indication of lift? (Fwd stick necessary to avoid pitching on her back in the climb.)
There's more. A byproduct of lift is the vertical velocity which produces downwash. Diana stated she is hiting something on her way back down from the hammerhead. How valid is the assumption that it is downwash, a product of lift, which Diana hit on the way back down??
I spend zero time past 30* pitch so I plead ignorance. I greatly desire clarification of Lance's statement. Also, show me my errors in what I have presented here.
"I'm not sure what you're hitting on the way down, but it can't be your wake as none is generated on a vertical climb (no lift)."
Something about that just doesn't sit well with me. I'm thinking if the wing is not producing lift because it's past CL max the wing must be in the stalled condition where all airflow has separated from upper wing. Yes, I recognize the maneuver is a stall but the stall doesn't occur until at or nearly at the top of the vertical climb. The stall could not begin before that point otherwise it would prevent the vertical climb in the maneuver. So the a/c is in a vertical climb and still producing lift until the stall.
Therefore, the wing is not stalled until that point and is producing lift. Would not any application of any amount of forward stick in the climb be an indication of lift? (Fwd stick necessary to avoid pitching on her back in the climb.)
There's more. A byproduct of lift is the vertical velocity which produces downwash. Diana stated she is hiting something on her way back down from the hammerhead. How valid is the assumption that it is downwash, a product of lift, which Diana hit on the way back down??
I spend zero time past 30* pitch so I plead ignorance. I greatly desire clarification of Lance's statement. Also, show me my errors in what I have presented here.