Mailing List lml@lancaironline.net Message #63770
From: John Smith <john@jjts.net.au>
Sender: <marv@lancaironline.net>
Subject: Re: [LML] Re: stalls
Date: Sun, 06 Jan 2013 10:19:36 -0500
To: <lml@lancaironline.net>
I don't know how widely advertised the Legacy wing cuffs are, but following Lancair's testing of wing cuffs on their company fixed gear Legacy a few years ago, I offered to be the guinea pig for testing the wing cuffs on an RG. I retrofitted wing cuffs to a year or so ago. Testing was done initially with the cuffs "taped on", but the outcome was fantastic so fitted them permanently. The results can be summarised as:-
  • Stall speeds, clean and dirty, increased by about 1kt (if that)
  • No measurable differences in TAS for given PA / rpm / MAP / fuel flow references
  • Stall strips continued to provide early warning of impending stall
  • As the centre section stalls (outboard sections with wing cuffs still flying), serious airframe vibration follows due dirty air flowing over empennage leaving one in no doubt that the wing is about to stop flying… but all that happens is that the nose drops ever so slightly, buffeting stops and wing unstalls. No wing drop.
  • Reducing airspeed in continuous 30deg AoB turns and approaching the stall – same outcome; there is no tendency for wing drop; can fly round and around on the stall and the aircraft drops in and out of the stall; ailerons are responsive throughout
Despite the above, I have no desire to routinely fly to the stall, but its comforting to know that should I or anyone else flying XTZ screw up, one would have to be seriously distracted to not realise that the aircraft is not "comfortable". And BTW… I wouldn't dare do the above without a seriously experienced pilot alongside me!

I think Greg Cole and Lancair have done a wonderful job designing and producing these wing cuffs for the Legacy.

I encourage any owner of these and other high performance aircraft without wing cuffs fitted to consider them. They don't, as far as I understand, necessarily make an aircraft "spin proof", but in the case of the Legacy, they would seem to provide an additional margin for error.

Attached a few pics.

If anyone wants more info, I'd be happy to expand on my experience.



Regards,

John


John N G Smith
Tel / fax:    +61-8-9385-8891
Mobile:      +61-409-372-975
Email:         john@jjts.net.au


From: "pete@leapfrogventures.com" <pete@leapfrogventures.com>
Reply-To: Lancair Mailing List <lml@lancaironline.net>
Date: Sunday, 6 January 2013 9:34 PM
To: <lml@lancaironline.net>
Subject: [LML] Re: stalls

IMHO, this discussion about practicing stalls/spins so you can learn how to recover from them is a bit nuts.  The VAST majority of stall/spins occur in the pattern, where there is not enough altitude to recover, no matter how skilled you are.   I believe a big portion of the remainder are related to autopilot stalls.

 

I do think there are two silver bullets that can prevent almost all stalls/spins.

 

First, most all of us have Sorcerer autopilots.  Set the minimum airspeed on the Sorcerer to just under your best glide speed.  For my ES-P, I use 95 knots.  That saves me from the autopilot induced stalls.  It also makes setting best glide in engine out easy – just do a direct to on the Garmin, and the autopilot will turn me in the correct direction, hold altitude until my airspeed bleeds off to 95, then maintain my airspeed at 95 in the descent.  While all this is going on, I can focus on trying to get the engine restarted.

 

Second, buy, install, and calibrate an AOA.  My Advanced AOA did not require me to do a stall to calibrate it.  I followed the directions, and bitching betty starts yelling at me at around 70 knots in the flare, which is exactly the margin that it was designed to have.  She has already saved me once when a distraction got me going a bit slow on a base leg.  She yells, I push.  The only hard part was learning to ignore her when flaring, but that is another discussion that relates to growing up with too many sisters.

 

Let’s stop pretending that our superior pilot skills will always save us.  Even the best of us get distracted and make mistakes.  It is time we all invest in the technology that is already there to save our asses when we do something stupid and stop claiming we are better pilots than everyone else because we fly high performance aircraft.

 

Sorry if this sounded like a rant.

 

Pete

 

From: Jarrett Johnson [mailto:hjjohnson@sasktel.net]

Subject: Re: [LML] Re: stalls

 

there is no single silver bullet to answer it

 

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