Re: Need a Sparrow Strainer alternative


Paul Buckley
 


Heh heh, ' not-an-idiot' Jason
 
I guess that the maxim is 'engage brain before tapping the keys'
 
Prior statement disregarded ............... :-)
 
 
 
 
 
 

----- Original Message -----
Sent: Friday, September 20, 2013 5:16 PM
Subject: Re: [Q-LIST] Need a Sparrow Strainer alternative

 

Hey guys,
Sorry for the lack of an intelligent remedy.  After reading my response again, I can't believe I even came up with that rediculousness, must have been the lack of sleep or this cold I have.  I won't say what industry I'm in either, it would scare too many.  Now that I have broadcasted myself as an idiot, maybe my future responses can be more educated so I can begin to save face.
Disregard my prior statement.
Thank you, Jason Nemake  (not an idiot)
 

From: Jason Nemake
To: "Q-LIST@..."
Sent: Thursday, September 19, 2013 8:15 AM
Subject: Re: [Q-LIST] Need a Sparrow Strainer alternative
 
Guys,
Are the elevator control surfaces statically balanced on the LS airfoil, like they are on the GU airfoil?  If so, then I would guess that if you unbalanced the control surface and started increasing the cg of the control surface aft, to try and cancel the lifting effect caused by the LS cuspt then heavy springs or sparrow strainers might not be needed.  One could possibly go as far as weighting the trailing edge.  The result would be a drooped elevator on the ground until reaching flying speeds, and a positive effect on the stick at low speeds.  Maybe even a combination of springs and aft weight.  There of coarse would be G effects to this idea.  Some things to ponder..
Jason Nemake

From: "jcrain2@..."
To: Q-LIST@...
Sent: Wednesday, September 18, 2013 8:55 PM
Subject: Re: [Q-LIST] Need a Sparrow Strainer alternative
 
Sammy,
Didn't  Tom Moore and Bob Malecek have an adjustable flat piece of aluminum or stainless in place of the upside down airfoil?  I think it had a slight up kicker at the back though.  Call them to see what their ideas were.  It might be a bit less drag perhaps X 2.
Bruce  ---------- Original Message ---------- From: Sam Hoskins To: Quickie List Subject: [Q-LIST] Need a Sparrow Strainer alternative Date: Wed, 18 Sep 2013 16:14:44 -0500
 
The Sparrow Strainers are draggy and slow our planes down. �There must be an alternative. �Every time a speed specialist looks at the the sparrow strainers they go "WTF"?
 
So, let's start at the beginning. �Why are there in the first place?
 
As I understand it, they are an aerodynamic trim designed to counteract the high pressure on the bottom of the canard elevator. �Air wants to push the TE of the elevator up, causing the plane to dive, so the sparrow strainers help by pushing it back down.
 
Is this logic correct?
 
So, what would be a drag-free alternative? �Well, I suppose one could increase the spring tension already used for the control stick. �Why didn't QAC do something like that? �Maybe it would increase the stick forces. �Just guessing but when they first flew flew the new �LS-1 airfoil, they probably found they needed an extraordinary amount of nose up trim. �Followed by going with the cheapest fix - add sparrow strainers.
 
Another issue with using internal trim, is you are applying a constant torque to the joint there the elevator bellcrank slips into the elevator torque tube. �Maybe it's not a big deal, bit it's there.
 
This is all supposition. �Is anyone privy to the real story?
 
So, all of you aerodynamic tinkerers, what could be a viable way to eliminate the sparrow strainers?
 
Thanks for reading.
 
Sam
 
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