Herbert Fürle's German KR2S


Herbert Fürle's German KR2S


Here's some info about me and my "airgrafia". I'm 54 and married with a nonflying-but very comprensioneful wife (of course) since 1968,I have a daughter and a son-only passengers-and a 4 year old grandson-my safety pilot for the future?! I learned sailplaneflying when I was 14. Since than I flew approximately 1200 hours with different planes-from scoolgliders up to highperformance composit- gliders like the Hornet or the famous Libelle-L/D 40:1. 1984 I started to construct my first homebuilt, a FFP202"Koala". I flew the little "Piper" a few years and started building my Kitfox IV( I think you have the Pic.?) in 1993. My successful maidenflight was in the fall of 1995 1994.

I chanced to meet Roy Marsh at Sun'nFun and I was so impressed by his KR2S that I decided to start building me this plane immediately after I have finished my Kitfox-I do it!

After I have finished my "Banana boat" and all my spars I made a break(maybe a little listless)-Exactly in this time I heard from you and got all the new info about the new Airfoil and all the good changes on the KR2S-what a chance. I immediately continued my project with all the goodies- just at the right moment I think.

I use-as you can see on the pic's,- the AS5046 and lengthened my HS 3" on both sides. I've done my woodwork with european pine(about 12% stronger than spruce but also a little heavier)and birch plywood. I glued it together with UHU-PLUS ,comparable with EpoxyT88. The foam I use is polyurethan ,a little tighter as recommanded by RR. The glass and resin I use is all aircraft-certified and in the same size as recommended by the construction manual it's also used by Schempp-Hirth and Schleicher.


Pic #1gives an image how the KR2S looks from the side.


Pic#2 demonstrates the installation of the gearatachbracket from Dan Diehl, the fit of the spars, both seatbacks,the temporary installed aftdeck ,the fueltank-dashboard-combination naturally removeable and the pedals without brake accessory.


.On Pic#3 you'll notice the additional 3" span to the HS and how I designed the tip of the HS, probably I add another hinge at the outboardside.Further you can see how the aftdeck-made from foamplanks ,shaped and glassed in the descriped manner by RR-fitsto the tailgroup. The following pics gives an impression of my solution how I installed the seats and the controls(most of them standard exept the Joystick).












Below is an update, December 2003

My Kr did'nt sleep and I was very busy with my project as you can watch on the newest pics .I had my first inspection this summer and I continue to finish my Plane probably next year.

The yellow Engine you can see is a typ 4 Porsche engine which was restored by me and basicly I planned to install this engine.But I changed my mind and now install -as you can see on some pic's- a Rotax 912 S. The one you can see on a pic is only temporary installed and a poor mokup for better handling .

The pic's shows how I did the roots and wingtip on my outer wings.further you can watch the progress of the canopyframe and the canopy also.The canopy is basicly used on a german motorglider and the thickness is about 1/8 inch.(3mm).You can also recognice the tailwheel (an oldone RV4).

The cowling you can see is from a 912 equipped Cherry (similar to the Kr2S).I've got the molds from a friend and I've glassed them for my KR. They need minor changes to fit to a KR. One picture shows how much space i had in the fabric-hangar of my friend norbert-a great mentor of my project.He is the one who made all the machined parts for my Kr.















You will notice my solution of installing a "springtrimsystem" for the elevator into the joy-stick.With the trim lever you change the sticklevel -a very simple but effective way, I think. I installed also two springwires to give you the feeling of "inputforce" for the aileron axis due to the very light control forces. The springs also moves the stick to its neutral position.











That's for the moment.Thanks a lot.sincerely Herbert

PS.:If anyone has questions, feel free to contact me at my Email address, KR2SL@aol.com.