REFLECTOR: Sparrow strainer - I'm confused...

[Rene Dugas]

My strainer's convex surface is down and it decreased the frequency of adjusting the trim.  I flew with and without.  Trim range is exhausted in down position but that is ok.  I don't want to trim the canard into a stall.  Landing requires a slight pull at main gear contact to keep the nose up but very comfortable. Trims back to 90 knots with three in the plane. 
I recommend the strainer foil down with "do not touch" sticker on the top.
600 hrs. 

Sent from Rene's iPad. A pleasure.  Go Apple.


On Sep 14, 2012, at 9:01 AM, Geoff Gerhardt <geoff.gerhardt at gmail.com> wrote:

> Guys,
> 
> As I'm flying more, I'm getting a better feel for the plane and discovering little issues.  I noticed yesterday that when I really dangle (i.e. >160kts), I run out of down trim.  I guess I wasn't paying attention before, but as I speed up, I need to keep adding down trim - I thought that's what the sparrow strainer was for.  As speed increases, the canard is generating more lift, so the sparrow strainer trims the nose down so that less trimming is needed for speed changes.  But then, I was looking at the way the sparrow strainer is mounted and it looks like it would do just the opposite.  As speed increases, the sparrow strainer will be pushed down, adding trim up!  I have my aerodynamic trim installed as per factory instructions.  I've heard of some who install it upside down, which to me sounds like how it should be installed.  I have a feeling that if I remove it I'd have to trim less with speed changes.  Unfortunately, I used some pretty aggressive silicone glue to put it on and I'm afraid I'll make a mess of it taking it off.
> 
> Any thoughts on the effectiveness/correct installation of aerodynamic trim?
> 
> Here's now I have mine installed:
> http://thegerhardts.com/velocity/?p=491
> 
> Geoff
>  
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