Re: Sparrow Strainer


Terry Crouch
 

I am not smart enough to be in this discussion.  The one comment I will make is I make mine adjustable. If I change the angle 2 degrees + or 2 degrees -  from plans the way the airplane flies is dramatically different. Be careful out there.

Terry Crouch
Quickie N14TC


-----Original Message-----
From: Troy Zawlacki <troyzc3@...>
To: main@q-list.groups.io <main@Q-List.groups.io>
Sent: Wed, Feb 23, 2022 7:48 pm
Subject: Re: [Q-List] Sparrow Strainer

I want to add a note on the sparrow strainers that I haven’t seen mentioned yet. There are (at least) two variations of sparrow strainers in the plans from QAC.

Here is the one that you will get in the package from Jon Matcho with Dan Yager’s name on it. The plans say to put this 1” outboard of the inboard edge of the elevator, so basically as close to the fuselage as possible.

The lesser know profile is this one straight from QAC back in the day. This one says to offset it 24.75” from the inboard edge of the elevator. Also the length of the airfoil here is 17.75” compared to 11.5” in the other (newer) design.

So while there are at least these two official variants of the “hack,” builders seem to take a lot of liberty with this part of the plane. I’ve probably seen a dozen variations of the placement when I was researching before building mine. I built the smaller 11.5” ones.

TAZ

On Feb 23, 2022, at 4:50 PM, Jay Scheevel <jay@...> wrote:

Ok, just checked the plans based version and it is more like 40 degrees from the top of the sparrow strainer airfoil and the top of the elevator. That is what mine is, since it is per plans, or at least I think it is. I will measure mine this weekend.

Yours is about 10 degrees lower angle (30 vs. 40 degrees), and as you said, it appears to work fine. So we are making some progress here....  I will do some more modeling and let you know.

Cheers,
Jay

-----Original Message-----
From: main@Q-List.groups.io <main@Q-List.groups.io> On Behalf Of Jay Scheevel
Sent: Wednesday, February 23, 2022 5:22 PM
To: main@Q-List.groups.io
Subject: Re: [Q-List] Sparrow Strainer

Thanks Chris,
Quick turn around! It sounds like you are about in the same ballpark as I am wrt to angle, so my guess is that your sparrow strainer is also stalled. Sometime when you get back to flying in the spring you can put some tufts on there and prove me right or wrong. For the time being, I am working solutions from a number of approaches

Cheers,
Jay

-----Original Message-----
From: main@Q-List.groups.io <main@Q-List.groups.io> On Behalf Of Chris Walterson
Sent: Wednesday, February 23, 2022 5:16 PM
To: main@Q-List.groups.io
Subject: Re: [Q-List] Sparrow Strainer

 Jay-----------  I found the info you wanted. Easier than putting on the snow shoes. The strainer airfoil is 2 x 10.25 and is upside down. I used

 balsa and sanded to an airfoil shape and glassed.  The side arms are from 1/8 plywood glassed. My airfoil can be adjusted, but I never needed to. The top of the strainer relative to the top of the elevator is 30 degrees.  Enclosing a pic of the strainer while I am checking the elevator travel

Hope this helps.  Take care------------  Chris


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