Which airfoil shape is the best?

My name is Patrick Hanley and I am new to DIY drone.  My background is in aerodynamics.  I received my SM & Ph.D. degrees from MIT.  I worked as a professor at U of Connecticut teaching aerodynamics and compressible fluids before starting Hanley Innovations about 20+ year ago.

This video is an introduction to the commercial software that I write and post on my website:

I look forward to interacting with the DIY Drones community.

Best wishes,

Patrick

Views: 1757


Moderator
Comment by Gary Mortimer on September 28, 2015 at 9:07am

Excellent, maybe you could run through some MH flying wing aerofoils for the members here. Advantages disadvantages and how your software might help in design. Welcome aboard.

Comment by Patrick Hanley on September 28, 2015 at 9:17am

Hi Gary,

Thanks for the welcome.  Let me know if you have specific questions.  Best wishes.


Moderator
Comment by Gary Mortimer on September 28, 2015 at 9:58am

Well I think we have seen lots of tip stalling and bad behavior from flying wings and finding out what somebody from the world of aerodynamics thinks of  flying wings would be of interest. I expect others will chip in.

Comment by Patrick Hanley on September 28, 2015 at 10:15am

Thanks Gary.

I like flying wings because of their drag characteristics.  

Just thinking ... tip stall can be due to the higher taper ratio of flying wings.  Also sweep and end plates tend to push the maximum effective angle of attack towards the tips.   Washout can help.  


Moderator
Comment by Dwgsparky on September 28, 2015 at 10:36am

I (and many others) use flying wings with good success, but the ready made airfoils (like the X5 on the left) can be tricky to set up, it would be good to have a defined "best solution" to the tip stalling and other control problems other than simply moving the CG forward to a point that it behaves!  

The X5 for example will always tip stall with the CG too far back and it also suffers from opposite direction induced yaw. Solved by reducing the down going elevon movement. 


Moderator
Comment by Gary Mortimer on September 28, 2015 at 10:57am

That's just the sort of thing that needs to be discussed Dwgsparky. 

Comment by Justin Martin on September 28, 2015 at 11:52am

Patrick, welcome to DIYD! May I ask the benefits of your (purchasable) product over say Dr Drela's free xfoil and xflr5 programs?

Gary, just to play devils advocate here, but maybe a good discussion point would be the use of flying wings in the first place. This in a way relates to the Quad vs conventional helicopter debate. Quad is mechanically simpler (debatable), however aerodynamically inefficient in comparison.

Comment by Johnatan on September 28, 2015 at 12:00pm

Welcome Patrick!

You may have a look at this wing: http://diydrones.com/profiles/blogs/techwing-gets-winglets-and-slots

Comment by Patrick Hanley on September 28, 2015 at 1:10pm

I wrote the first 3 versions VisualFoil a few years before xfoil became a free product.  Xfoil is good. I used an early version of in at MIT in a viscous fluid flow class.  As you know, xfoil is good for low reynolds numbers. The strength of VisualFoil is its user interface and integrated algorithms.

My software (the later version & not VisualFoil 5) solve the Euler/Navier-Stokes equations. This makes them robust for complex shapes, really low Re, high Re etc.    I also use them in my contract work.

DIY Drones is great.  I love the pictures and technology on the site. 

Comment by Justin Martin on September 28, 2015 at 1:48pm

Thank you for your input Patrick!

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