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Jim,
Anyone research horizontal tail stall? Horizontal tails are almost always thin airfoils with small radius leading edges, which translates low AOA stall. Also, 'modern' horizontal tails are high aspect rastio, instead of the stubby WW I or Pitts type tails which have 3D flow and don't really stall.
In a fully developed stall of the wing, I once experimented with tufting of the h-tail., and found the tail stalled a few degrees above the wing stall. The result was a slow nose-down recovery. Then I made slots on the h-tail's leading edge, and from a very high AOA stall the tail did NOT stall, and the stall recovery was -- fast.
Some food for thought....
Terrence
L235/320 N211AL
Waiting for the DAR.
----- Original Message ----- From: "Jim Nordin" <panelmaker@earthlink.net>
To: <lml@lancaironline.net>
Sent: Thursday, October 02, 2008 08:12 PM
Subject: [LML] Small tail vs. large tail
Measure the AOA of the horizontal stabilizer. Compare that to factory book
specs. A high angle would serve to reduce elevator effectiveness on the up
side.
Jim
-----Original Message-----
From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of Lorn
H Olsen
Sent: Thursday, October 02, 2008 8:33 AM
To: lml@lancaironline.net
Subject: [LML] Re: Small tail vs. large tail
Bill,
Elevator up and down are to book specifications. Some time in the next
couple of months, I will try to stop by when you are home and we can
do some inspecting.
I would like to know why our planes fly so differently (if they really
do).
Lorn
From: "Bill Harrelson" <5zq@cox.net>
Date: October 1, 2008 10:54:35 PM GMT-04:00
Lorn,
If you need 80 kts to get the nosewheel off the ground, sounds like
you've got an elevator travel problem. Not necessarily a trim
problem. Are you able to get the book specified deflection?
Bill Harrelson
N5ZQ 320 1,650 hrs
N6ZQ IV under construction
--
Lorn H. 'Feathers' Olsen, MAA, ASMEL, ASES, Comm, Inst
DynaComm, Corp., 248-345-0500, mailto:lorn@dynacomm.us
LNC2, FB90/92, O-320-D1F, 1,470 hrs, N31161, Y47, SE Michigan
--
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