REFLECTOR: Fw: Sparrow strainer - I'm confused...
John Dibble
aminetech at bluefrog.com
Wed Sep 19 13:24:02 CDT 2012
Is there some safeguard to prevent the screws from loosening and the ss
moving to a position beyond what the spring can handle?
John
On 9/19/2012 1:02 PM, Andrew Ellzey wrote:
>
>
> Geoff,
> Two photo's attached.
> Andy
>
> *From:* Geoff Gerhardt <geoff.gerhardt at gmail.com>
> *To:* Andrew Ellzey <ajlz72756 at yahoo.com>
> *Sent:* Tuesday, September 18, 2012 9:34 AM
> *Subject:* Re: REFLECTOR: Sparrow strainer - I'm confused...
>
> Andrew,
>
> I was thinking of doing something similar - please send me a
> photo when you get a chance.
>
> Thanks.
>
> Geoff
>
> On Tue, Sep 18, 2012 at 10:21 AM, Andrew Ellzey
> <ajlz72756 at yahoo.com <mailto:ajlz72756 at yahoo.com>> wrote:
>
> Geoff,
> Cutting the Sparrow Strainer off and reattaching it at a
> different angle seems a bit harsh. I made my SS adjustable
> by potting a 10X32 nut plate inside each end of the
> airfoil. So the Airfoil is then held in place on by two
> 10X32 screws. I am not flying yet, so I don't know if my
> aircraft even needs an adjustable SS. But from all of the
> talk of trim problems on the reflector, over the years, I
> thought that I would be proactive and make my SS
> adjustable. I will install mine per the manual, but if
> needed, I can change the angle of attack or even invert my
> SS airfoil as some have suggested. I also think with a
> little trial and error, I should be able to adjust the SS
> depending on my aircraft CG calculations, due to passenger
> loading. This may be wishful thinking on my part, due to
> the small size of the Sparrow Strainer. I can send you a
> photo latter today if you think this option will work for you.
>
> *From:* Geoff Gerhardt <geoff.gerhardt at gmail.com
> <mailto:geoff.gerhardt at gmail.com>>
> *To:* Velocity Aircraft Owners and Builders list
> <reflector at tvbf.org <mailto:reflector at tvbf.org>>
> *Sent:* Saturday, September 15, 2012 7:45 PM
>
> *Subject:* Re: REFLECTOR: Sparrow strainer - I'm
> confused...
>
> Guys,
>
> Thanks for all the suggestions. What I think I may do
> is cut the arms that join the SS to the elevator and
> then re-connect them with the SS airfoil at a lower
> angle of attack to reduce the speed-induced up-trim.
>
> Today, I had a great flight. I made some changes to
> my cooling plenums that reduced temps in cylinder #3
> (I'll describe these changes in another email), so I
> was able to do a pretty aggressive climb to 10,000'.
> I was going to do flutter testing, but when I dove to
> gather speed, I found that too much stick pressure was
> req'd to go above 180kts to properly assess flutter.
> I could not trim it so that I could take my hand off
> to give the stick a whack because I had to keep down
> pressure to stop from climbing out of the dive. All
> control surfaces were fine to 180kias, but I think
> I'll need to address the aerodynamic trim to go
> higher. Or, is it okay to have stick pressure on when
> doing flutter testing?
>
> Geoff
>
> On Sat, Sep 15, 2012 at 11:20 AM, Terrence Miles
> <terrence_miles at hotmail.com
> <mailto:terrence_miles at hotmail.com>> wrote:
>
> Geoff,
> Over the past 10 years or so, the sparrow strainer
> debates and opinions (which are always
> fascinating to me) and the "running out of trim"
> issue come up on a regular basis. Geoff, you are
> hardly the first in the test flight phase to
> wrestle with this. I have the RGXL-5 with a LY
> IO540. I weigh 150 pounds. Empty wgt she is 1928
> lbs at 136.4 I know other light weight pilots
> like me that fly with ballast on the floor by the
> right seat. I don't because I have two nose
> mounted Odyssey batteries. XC by myself with 70
> gal of fuel and the usual crap in the back seat
> area (125+ lbs) I am at a CG of 130ish. With a
> 185 lb copilot it goes to 128.3 or so if anybody
> out there is considering 2 nose batts be aware of
> that limit. Because I am short I have the arm of
> my seat is 79 inches. The copilot is at 83 inches.
> I am not suggesting this for others, but with
> advice like you are seeking right now, and more
> than several conversations with Malcolm Collier
> and others, I decided to do this: The factory
> trim spring didn't fit due to insufficient space
> behind the panel without major changes. Also the
> stock elevator trim motor throw was too short. I
> have a speed brake trim motor running my elevator
> trim which is longer by an inch or two. Yes, I
> have to watch for fractures in my sawed off,
> reduced curve spring, but I don't run out of trim
> no matter wgt, CG, or speed.
> Terry
> *From:*reflector-bounces at tvbf.org
> <mailto:reflector-bounces at tvbf.org>
> [mailto:reflector-bounces at tvbf.org
> <mailto:reflector-bounces at tvbf.org>] *On Behalf Of
> *Richard J. Gentil
> *Sent:* Friday, September 14, 2012 10:31 PM
> *To:* geoff.gerhardt at gmail.com
> <mailto:geoff.gerhardt at gmail.com>; Velocity
> Aircraft Owners and Builders list
>
> *Subject:* Re: REFLECTOR: Sparrow strainer - I'm
> confused...
> Geoff,
> To help solve the issue I just cut my sparrow
> strainer in half.
> Richard
>
> Sent from my iPhone 4 Classic
>
> On Sep 14, 2012, at 10:01 AM, Geoff Gerhardt
> <geoff.gerhardt at gmail.com
> <mailto: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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