Archive for August, 2009
I just wanted to post a quick write up on some RC Models with KF Airfoils. Both Frank and I have been pretty amazed with the results we are getting with the planes that have featured some of the various versions of the KF airfoils. So far Frank and I have experimented with the FMm2 airfoil (Top of the wing version) and the KFm4 airfoil (top and bottom version). Some of the planes that have featured them are the, new Bullet Plane, Tailless Delta Wing and the experimental forward swept wing plane. All of these planes seemed to fly with better stability than planes without KF airfoils. Frank mentioned how he was amazed with how much extra lift they seem to have and how they “Feel Locked In On Rails”.
So I just wanted to start keeping a sort of log and special area on our website with information on KF airfoils. As some of you may already be aware we recently started the category on our blog dedicated to “KF Air Foils and Dick Kline Articles”. In this area of the blog we will try and keep all the information as related to KF Airfoils and on occasion we may even have other articles from the KF Airfoil inventor, Dick Kline himself. Dick Kline has already been kind enough to contribute some articles and write-ups on his cool invention. Both Frank and I are very grateful to have Dick Kline as a friend. I’m hoping in time to make this area of the Blog a good resource for people to learn, share and discuss the different versions of the KF Airfoil and also a good place where all of us RCer’s can help Dick Kline prove the value of his simple but awesome invention.
Last, if anyone feels so inclined to want to share their findings or examples of KF Airfoil RC planes, please feel free to contact or email us at email@example.com . We will be glad to post any good articles or videos that may help others learn from your findings.
Before I close this article I just wanted to link a couple of videos you may have already seen on YouTube of examples of KF airfoil planes.
This video is on the two delta wing planes Frank made. One with the KFm4 Airfoil and one with out. We fly them back to back and see how they handle.
This video was made by our friend Ken or ‘Wildhover” on YouTube. He made a cool video for us to let us know of his findings on the KFm2 airfoil on his scratch built Euro-jet. Ken jokes that it is boring, but I know I thought it was good and informative. Big thanks to Ken for sharing his findings and for giving us permission to have it on our Blog.
Last is a video of Frank’s newest plane with the KFm2 Airfoil. There has been some argument that KF airfoils cause too much drag. I think Frank’s plane shows it’s not very slow, or hindered by the KF airfoil. It shows its still a very fast airfoil and also Frank notes how super stable the plane flys.
We have been getting a few questions time to time about converting dimensions from English to Metric on plans or converting miles per hour to kilometers per hour, etc. The other day I was doing a little searching on the Internet and found a Freeware Conversion Calculator. Its very basic, but its packed with some good conversion tools for converting units from English to Metric or vice versa. Also for converting to different types of measurements, like converting Watts to Horsepower (Under “Power” tab).
Here is a screen shot (Click the Picture to Download Zip File):
All in all I found the tool to be basic and straight to the point. Very easy to use and nice and compact. I know if any of you are like me, you can never remember all the conversion factors off the top of your head. So it’s handy when needed. Anyway just thought I’d share the tool I found. I hope some of you will find this too useful.
How to Enter the Drawing.
To enter the Drawing, you will need to do the following:
- Subscribe to our rcFoamFighters YouTube Channel if not already
- Send an email to firstname.lastname@example.org
- In email include your YouTube Name
- Make Email Subject “August 2009 Drawing”
That’s it, do this and you will have a chance to win this months prize.
Prize For August 2009 Drawing:
This month’s Drawing is Sponsored by rcskyflyer.com, the exclusive supplier of EPP Foam and Carbon products to rcFoamFighters. If you are looking for or are in need of EPP Foam or Carbon Products please visit http://www.rcskyflyer.com .
For this Drawing/Giveaway, for the Month of July 2009, the prize will be:
- An EPP and Carbon kit to build Frank’s new SkyFighter V2 rc plane (all EPP parts to be Pre Cut and beveled)
- Supplied 1 roll of Henrys weave to “Bulletproof ” your build
- Set of Control Horns
- Set of Control Rods
- 1 plastic Cockpit
- Set of Pre-Cut Foamboard Vertical stabilizers
With these parts you will be able to add your electronics to build your own SkyFighter V2, a fast and agile rc plane.
Again rcFoamFighters would like to thank rcSkyFlyer.com for sponsoring this Drawing /Giveaway!
Good Luck To All Who Enter!!!
Update, the winner for the Augusts 2009 Drawing/Giveaway is “SLOSHAYS”.
Big thank you to all who participated in this months Drawing. Please stay tuned, the September drawing prize will be announced shortly.
I just wanted to do a quick follow up post on the new “KF Condor RC Plane” that I posted video of on our YouTube Channel. A few months ago I bought the book Dick Kline wrote, “The Ultimate Paper Airplane” . It’s the book where Mr. Kline tells his story of how his paper airplanes lead him and his friend Floyd Fogleman to the invention of the “KF Airfoil”. It’s a really good book that tells about the theory of why the airfoil works and also tells about it’s wide range of flying benefits. The book tells of the many shows and articles that Dick Kline was interviewed on and for. From David Letterman to 60 minutes, Omni Magazine and so on. His airfoil was even tested by NASA. Dick Kline also has a patent for this awesome invention.
There are many people who have tried the KF Airfoil with good positive results, including my brother Frank and myself. We have both noticed a real difference when comparing similar planes with and without the KF Airfoil. The biggest good benefit I noticed was the slow speed stability of the KF airfoil equipped wing. Also the KF wing was much more responsive, I believe because the KF airfoil keeps the air over the control surfaces better. This is all just my theory, but something we at rcFoamFighters want to explore more. And thankfully we have a new, good friend to help us, Mr. Dick Kline himself.
So, having said that, my next project I have decided to build with a KF airfoil will be a plane inspired by one of Dick Kline’s Paper Airplanes, The Condor. This plane will basically feature a KFm2 airfoil to resemble the wing of the paper airplane. I really like the look of this paper Airplane because it is unique with the smaller wings on top and rear of the fuselage. So I have drawn up a basic template for the plane in AutoCAD and I am now beginning to build the plane, so please watch our YouTube channel to see how it all goes.
Below I just wanted to share some pictures and a short write up Dick Kline himself sent me about his amazing plane, the Condor.
(below picture) Dick Kline with his Condor paper Airplane and a Wright Bros Replica Model
(Short email about the Condor from Dick Kline)
Here’s the brief story on The Condor.
When I developed my first stepped airfoil, it had the step on the bottom. I was pleased with the way it flew, but like so many of us, I wanted to experiment some more once I nailed down the step on the bottom. When I placed it on the top I found out that it produced higher lift than the one on the bottom. It would climb higher and travel a longer distance. Later tests at Notre Dame confirmed that the step on the top was able to generate higher lift over drag. I then played around with placing the elevators on the upper surface just in front of the rudder. After many different experiments and many different flights I had perfected The Condor, which would be the plane I would use to challenge the Wright Brothers distance record. In spite of very strong winds coming in off Cape Hatteras, I was successfully able to outdistance the distance record for the first manned flight of 122 feet. I did this in 1985 down in Kill Devil Hills, NC right on the spot where the Wright Brothers first flew. My distance was 401 feet, four inches. On the fourth flight that day of the Wright Brothers historic flight they traveled quite a bit further, so I was lucky that their first flight was just 122 feet.
Here is the data from the wind tunnel at Notre Dame. It would have been a lot higher if we had a rounded leading edge and a little camber. But we were interested in seeing exactly what the step produced by itself. Later, everyone would follow this configuration out the window and get poor results. This was our big mistake. But we also knew at that time that the step worked in different configurations and we couldn’t patent them all. All we wanted was to patent a step in the hopes that it would produce stall resistance to other airfoils. All the experts trashed this idea as too high in drag, yet the KFm4, with a step on the top and a step on the bottom, increases the speed of the wing. If the drag was so high, how could this be?
All in all, it has been a wonderful adventure and I feel very grateful and lucky for it. I have come in contact with many truly wonderful people in the RC community. From my perspective, the world could take some lessons from the RC people on how to work together, how to openly share information and knowledge freely and produce an environment of creativity and experimentation. This way everyone benefits and the learning curve climbs way up for everyone.
The gentleman who conducted these tests at Notre Dame was Professor John D. Nicolaides, the first head of NASA.”
Another picture of a version of the Condor
Here is a picture of the RC Plane I plan to make. Note that the RC plane will more resemble the Condor Paper Airplane version as pictured in Dick Kline’s book “The Ultimate Paper Airplane”. The Verison in the book appears to have a little different tail and the small wings on top of the rear of the fuselage appear to be larger. Anyway, here’s my attempted to make a plane in the style of the Condor.