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Re: Transfer Pump "Clicking"

Is it supposed to make noise? The one in my Q2 does. Now the Citabria I'm using for a tail-wheel endorsement is quiet (and the 172 is loud).

By Joe Hood <joe.hood@...> · #48759 ·

Transfer Pump "Clicking"

Today, my transfer pump was making a clicking sound from startup to shutdown. It seemed as though it was pumping into the header tank just fine though as fuel was passing back down through the

By Corbin <c_geiser@...> · #48758 ·

Re: Sparrow strainer stall

Comparison of shape of Roncz, and LS-1 airfoils. (from Q-talk 97)

By Jay Scheevel · #48757 ·

Re: Sparrow strainer stall

Comparison model data of Roncz versus a few other airfoils of that vintage. Cheers, Jay

By Jay Scheevel · #48756 ·

Re: Sparrow strainer stall

I don't have a clue as it has been a looong time ago when I set up the strainers. They were adjustable at first but the extra bolt heads sticking out in the wind and also the rough texture of the

By Bruce Crain · #48755 ·

Re: Sparrow strainer stall

Copy that David. I wonder if the Roncz canard has the elevator top air moving in board at cruise or was it designed out? I think Mark Shuck was working on a Roncz canard to the Quickie. I don't know

By Bruce Crain · #48754 ·

Re: Sparrow strainer stall

Bruce, The LS-1 airfoil has been a poor choice since day one, precisely because of the elevator shape that causes it to float trailing-edge up requiring sparrow strainers to counteract. And QAC knew

By David J. Gall · #48753 ·

Re: Sparrow strainer stall

Hi Bruce, If the tufts are pointing any direction other than straight back, they are caught up in the vortex within the separation bubble. The size of this bubble increases dependent on the

By Jay Scheevel · #48752 ·

Re: Sparrow strainer stall

Bruce, I found your previous description of stalling the sparrow strainers. What is the angle between the lower elevator surface and the bottom of the sparrow strainer airfoil? Regards, My you tube

By One Sky Dog · #48751 ·

Re: Sparrow strainer stall

Bruce, I have sparrow strainers outboard and added one inboard when my incidence was wrong. I do not fully understand when this is happening to your plane. Is this while you are rolling the plane? I

By One Sky Dog · #48750 ·

Re: Sparrow strainer stall

Thanks David, For a moment I thought it gave me a bit faster airspeed but the I realized that the air was pretty turbulent and I was having a hard time trimming for straight and level. I do know

By Bruce Crain · #48749 ·

Re: Sparrow strainer stall

Say Jay I think the tufts on the elevator were moving the same direction in normal cruise (from outboard to inboard) regardless of the sparrow strainer stalling or not stalling. It could be

By Bruce Crain · #48748 ·

Re: Sparrow strainer stall

Dang it! Bruce, I misunderstood where you were putting the zig-zag tape. Disregard my previous post.......

By David J. Gall · #48747 ·

Re: Sparrow strainer stall

Bruce, I don’t think the zig-zag tape “created drag” the way you describe it. To me, your description seems like the tape was doing exactly what it was supposed to be doing: keeping the airflow

By David J. Gall · #48746 ·

Re: Sparrow strainer stall

Oops, put the strainer on above instead of below he airfoil. Looks like the same story though…you decide. Cheers, Jay

By Jay Scheevel · #48745 ·

Re: Sparrow strainer stall

Hi Bruce, If the airflow were to not detach from the elevator (in a perfect world), the airflow would follow the black streamlines shown in the computation below. These “ideal” streamlines

By Jay Scheevel · #48744 ·

Re: Sparrow strainer stall

I haven't changed the angle of attach on the strainers yet. They are set for level cruise and I don't want that to go away so Vortex Generators next. I hope that the generators will make a bit of

By Bruce Crain · #48743 ·

Re: Sparrow strainer stall

On the bottom as the stall was happening on the underneath side of the strainer. The tufts on the aft of the strainers were disappearing underneath the strainers. Bruce

By Bruce Crain · #48742 ·

Re: Sparrow strainer stall

Bruce, which side of the strainer did you put the zigzag tape on? Top or bottom? Jay Sent from my Verizon Wireless 4G LTE DROID Bruce Crain <jcrain2@...> wrote: Jon, I tried the zig zag tape and did

By Jay Scheevel · #48741 ·

Re: Couple new videos (non-Q)

Rocks! Wow, thanks for the ride! Rick Hole

By Rick Hole · #48740 ·

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