Timeline for Why are highly cambered airfoils rarely used in propellers or wings?
Current License: CC BY-SA 4.0
10 events
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| Mar 30, 2020 at 13:49 | history | edited | Peter Kämpf | CC BY-SA 4.0 |
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| Mar 30, 2020 at 13:46 | comment | added | Peter Kämpf | @PeterCordes: Yes, it means both. Extensible and large, comprehensive. After all, extensive comes from the Latin word for "stretching out" (extendere). | |
| Mar 30, 2020 at 12:28 | comment | added | Peter Cordes | use extensive high lift devices - I think you mean extensible. I linked dictionary definitions of both, and retractable flaps (that's what you're talking about right?) are much more clearly described as "extensible", even if their area is extensive (large). | |
| Mar 30, 2020 at 6:45 | comment | added | Robert DiGiovanni | @alephzero check out lower speed applications and Reynolds numbers down to around 100,000. For many aircraft and birds, highly cambered airfoils are the best thing going for L/D ratio. | |
| Mar 30, 2020 at 4:58 | comment | added | Peter Kämpf | @toshiba: If we hypothesise a super-stiff material and build a propeller from it, and fit every blade of it with camber flaps, yes, it could be beneficial at some operating point to activate those flaps. Most likely flap angle would then vary over prop span to improve twist for the actual advance ratio. | |
| Mar 30, 2020 at 1:59 | comment | added | alephzero | @RobertDiGiovanni Highly cambered airfoils behave much better in a duct where there is another airfoil surface "above" the suction surface to constrain the flow. Aside from biplanes and triplanes, that does not apply to wings, and ducted propellers are also a rarity except for special purposes. | |
| Mar 29, 2020 at 23:44 | comment | added | Robert DiGiovanni | @toshi ba highly cambered airfoils are "one speed wonders". Great to see them in jet turbine blades though, probably one of the reasons jets are most efficient near full power. | |
| Mar 29, 2020 at 22:56 | comment | added | toshi ba | so in regards to propeller use, it is mostly a matter of load carrying capacity, twist and 'hot shape', correct? not because of its aerodynamics performance? Does it mean that if the stiffness of the blade was increased by geometry(increase chord) or by material (composites), then such airfoil would be ideal? | |
| Mar 29, 2020 at 19:20 | history | edited | Peter Kämpf | CC BY-SA 4.0 |
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| Mar 29, 2020 at 19:15 | history | answered | Peter Kämpf | CC BY-SA 4.0 |