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#15
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Mike Rapoport wrote:
wrote in message ... Mike Rapoport wrote: : Keep in mind that the short field settings shorten the ground run but : generally increase the distance to clear a 50' obstical. Isn't that the *point* of short field technique... to get off and over in the shortest distance? There would appear to be a logical flaw to that statement. I would agree that it will take more *time* to get to a given altitude at (e.g. 50' obstacle clearance)... Short field performance is defined to give the best obstacle clearance per *distance*. I would agree that soft-field technique will increase distance, but short is short. Am I missing something? Maybe :-) If the short field takoff is using a higher drag, higher lift configuration (more flaps) to get off the ground at a lower speed (shorter roll) it then takes longer (in both time and distance) to make the climb over the obstacle because of the higher drag configuration. I hope this makes sense. Yes, it makes sense, but I don't think it always holds up in practice. For example, in my Mooney, the recommended obstacle clearance technique is to not retract the gear until the obstacle is cleared. More drag gives a greater -angle- of climb. In the Helio, the shortest ground roll is with 40 degrees of flaps but the shortest distance over a 50' obstacle is with 30 degrees of flaps. It seems the configuration for best angle is model-specific. |
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