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

I will research this, Troy. Thanks for bringing this up. That is a huge difference. The 17.75 inch version is much lower angle, which probably explains the proportional reduction in angle on that

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

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

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

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. 

Thanks Chris. Any chance you could put on your snowshoes and go out to measure the angle difference between the top of the strainer airfoil and the top of the elevator surface. This would give me some

Here are few pics of what I did. These are strainers from Dragonfly plans. I only have two hrs on the airplane, but it did fly hands off with the available trim I had originally set.  Lucky.  Take

Problem is, Ben. It is always needed. The elevator will always want to push up (causing the plane to dive), so something needs to keep it in place. If it is not for the sparrow strainer, then you will

Anthony, I believe what you are talking about is an elevator slot, similar to a slotted flap? Jay's proposed elevator design is plain-flap style, unlike the R1145MS which does make use of an elevator

Jay - Keep going! This is great fun. With yarn video and your flow analysis it's clear there is a problem. What about an articulating tab, up only when it's needed? Ben Wilson

I think you are misunderstanding a concept. The airfoil only changes the direction of the flow, it does not occlude the flow. It doesn’t matter how closely you “tuck in behind” another body. The

Ok, thank you. Very hard to believe that an airfoil in free stream would behave similarly to the same airfoil tucked closely behind another body. I'm obviously missing something. I'll go back and

There I virtually no aerodynamic impact of the transition from the fixed elevator slot core to the elevator, so if that is what you mean, then no there is no effect. Cheers, Jay

"Elevator Slot" = "pocket" (pic taken from http://samhoskins.blogspot.com/search?updated-max=2014-06-18T04:55:00-07:00&max-results=20&start=27&by-date=false) -- Q2 N86KL

Not sure what you mean by “pocket”??

Here is about the best pic I could find without going out to the airport (sore throat). If I get a chance I will go to the airport for a side view so it can bet better evaluated. This is my set up

Jay, this is all very interesting. Do your (model) numbers for the above profile include the effect of the pocket that the elevator partially occupies and the gaps to the trailing edges of the

Hi Brian, So here is the non-engineering answer: The solution was developed a long time ago. John Roncz solved most problems for the Long EZ canard by introducing the new airfoil (Roncz

We think so..but remember that aerodynamics since 1980 has itself changed quite a bit, Brian. Aerodynamics is still an evolving study. Actually Manufacturing and Structures Design is also. Internal