Timeline for Does using a reverse high Cm horizontal tail airfoil coupled with a low Cm wing increase horizontal tail effectiveness?
Current License: CC BY-SA 4.0
11 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Aug 14, 2019 at 15:04 | vote | accept | Fred | ||
| Aug 4, 2019 at 13:50 | history | edited | JZYL | CC BY-SA 4.0 |
OP modified to state slotted elevator rather than "slatted elevator"
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| Aug 3, 2019 at 20:47 | comment | added | JZYL | @Fred Your OP mentioned "slatted elevator". I think you meant "slotted elevator". I've submitted a change to your OP to reflect this. | |
| Aug 2, 2019 at 14:09 | comment | added | Fred | I'm pretty sure this is a slotted flap. The max cL of a slotted flap is 1.5 cL base plus 1.3 cL for the slotted flap, for a total of 2.8 max cL, which is exactly the number Zenith is giving. | |
| Jul 29, 2019 at 17:05 | comment | added | JZYL | @Fred I think you mean an elevator where the hinge line allows a certain air gap (that's not a slat)? Most powered planes have sealed hinge lines to improve elevator authority limits. By one account, on a particular airplane model, the air gap (unsealed) seems to have helped. But I don't think this is a universal phenomenon and is model/profile dependent. | |
| Jul 29, 2019 at 15:55 | comment | added | Fred | See zenithair.com/stolch801/design/design.html. for their venturi/slotted elevator, near zero drag slats, low speed flaps, etc. | |
| Jul 27, 2019 at 16:51 | comment | added | JZYL | @Fred Where do you see they use a slotted elevator? On their design page, I only see slotted LE on the wing. | |
| Jul 27, 2019 at 16:32 | comment | added | Fred | Zenith uses a slotted elevator to generate as much downforce as possible, so they can ascend or descend at an AOA of 30 deg for STOL purposes with elevator deflections of 40 deg!! | |
| Jul 27, 2019 at 16:19 | comment | added | JZYL | @Fred tail stall occurs at negative tail incidence angle. Why do you think a slotted flap on tail helps? | |
| Jul 27, 2019 at 16:16 | comment | added | Fred | Perhaps a better description would be a slotted flap which would increase the cL max from 2.2 to about 2.8!! | |
| Jul 26, 2019 at 4:21 | history | answered | JZYL | CC BY-SA 4.0 |