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Oct 14, 2001, 09:54 AM
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Registered User
Join Date: Jun 2001
Location: North Branford, CT
Posts: 666
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Best rate of climb
I've been wondering about this subject. As applied to LMR contests.
In order to achieve the best <rate> of climb, does the assembled knowlege of this group think reflexing the airfoil would help? I haven't tried it yet. I have tried drooping the TE surfaces (as in thermaling) The angle of climb, understandably, was more impressive. The rate however was probably off a tad due to increased drag. Following that path, why wouldn't reflex (less drag) help the ROC? I'll try this when the rain stops... 'Til then, has anyone else wandered down this path? |
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Oct 14, 2001, 01:12 PM
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#2 |
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Ascended Master
Join Date: Oct 2000
Location: Palmdale, CA
Posts: 10,520
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The only certain way to determine whether reflex or camber will improve the roc is to test. An altimeter recorder.. such as a Casio Watch.. some method of determining the altitude after a set time.. climb under power for a set time, glide back down. With a pure glider it will difficult to establish a set of conditions where the flap position change only can be observed.
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Oct 14, 2001, 10:02 PM
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#3 | |
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Registered User
Join Date: May 2001
Location: Cambridge, MA USA
Posts: 1,633
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Re: Best rate of climb
Quote:
If the prop has the same efficiency at all flyable airspeeds, then you want to climb slowly at the minimum-sink speed, probably with added camber. A huge prop with a 20:1 gearbox might be close to this limiting case. A more realistic prop will be smaller, with a somewhat lesser gear ratio. Such a prop will see some efficiency improvement at higher airspeeds, so the glider wants to climb faster than the min-sink speed to take advantage of this. Little or no camber might be best here. It depends on the particular glider. A small direct drive prop will see the largest efficiency improvement with airspeed. The glider then should be flown quite fast to keep the prop happy. Some reflex may be appropriate to minimize airframe drag at the low CL. - Mark |
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