KRnet is a free Internet mailing list devoted to helping KR builders and pilots to construct and fly their KR aircraft more safely and efficiently. This is THE place to get your KR questions answered. There are over 800 KR builders and pilots available to help you with problems that you may have concerning construction. It's a friendly group of folks who thrive on helping others. There are about 5-15 messages posted to the net each day. If you can't find it here, you're not gonna find it. To join, send an empty email message to
email@example.com You'll receive a "confirmation" email within a minute or so, to which you must reply for your subscription to take effect, along with name, address, and reason you'd like to join the list (this is to root out the spammers). You must be a member to post messages to the list. Again, this is completely free of charge, and we make a point of keeping it "advertising free". Once you are a "confirmed" member, you may make adjustments to your account (using the password sent to you in the confirmation message) such as to change your account to the digest version (which will put all messages into one message per day to reduce email). If you decide you'd like to UNsubscribe, simply send a message to firstname.lastname@example.org . Other information on the list itself and maintenance of your KRnet account can be found at http://www.krnet.org/info.html.
Please search the KRnet Archive for information on specific topics before posting questions to the list. It's considered poor form to join and start asking questions that have already been answered 100 times before.
Mike Sylvester's O-200 powered KR2S has a simple but elegant paint job that's unique among KRs. Simple is the theme with Mike's KR, and it works! A spinner and wheelpants are in the works.
Robert Pesak's O-200 powered KR2S has a unique one-piece wing that mounts from below the fueselage, along with some other well-made improvements, such as an aluminum plenum box system, with integral oil cooler.
The "Official" 2017 KR Gathering will be held at Lee's Summit Airport, MO, September 22-24th, hosted by Rob Schmitt. More details on the 2017 Gathering and registration for the event can be seen at http://www.krgathering.net. There's also a link to order shirts and hats, to be picked up at the Gathering. The die-hards will show up on Thursday the 21st, just to get a head start!
You can expect about 10-20 KRs to fly in for the Gathering, depending on the weather. 2007 was a record, with 21 flying KRs in attendance. This is THE place to put your hands on real KR aircraft, as well as talk to about a hundred other builders and pilots, so don't miss it! If you're light and lucky, you might just get a ride in one. You won't likely forget it soon either. The die-hards will arrive after lunch on Thursday, the 15th. For an idea of what you'll see at the Gathering, check the links below.
The KR Builders and Pilots forum will be held at the Oshkosh forum area on Monday, July 25th, probably in the morning (EAA schedule is still pending finalization). Mark Langford will lead the group in a discussion of issues concerning KR builders and pilots, including modifications, engine choices, first flights, etc. After the forum, attendees will be invited to look over the KRs that have flown in, which will likely be parked near Homebuilt Headquarters again.
The links below feature various KR projects under construction to provide some insight into the KR building process. There are also links to finished and flying KRs, just in case you need a little inspiration. You can also search the KRnet website for keywords:
KR2S Projects under Construction:
Completed KRs, with most recent completions at the bottom:
One good resource for new builders is "The KR Gospel, according to Mark".
There is an old but informative KRnet FAQ that is full of building tips. There is a lot of stuff there, so please check it out before asking the same old questions on KRnet.
In 2014 there was an EAA webinar devoted to the KR series that is an overview of modifications, engines, flying characteristics, etc. Please forgive the "iron lung" sound effects...the mic was too close.
There's a very informative "KR Performance" spreadsheet ) in web viewable HTML form that details performance numbers (speed, stall, weight, prop, engine, carb, etc) of many of today's flying KRs. The Excel spreadsheet version KR Info, so if you'd like to add a line or update yours, please send it to Mark Langford for inclusion into the Performance Spreadsheet
Please utilize the KRNet "Mail Archive" search engine at to check for immediate answers to your questions. This search engine has every email posted to KRnet since 2003, so whatever you're looking for, it's probably there! Thanks to John Boyeau for doing all the leg work to make this happen.
We also have another archive mail system at " http://tugantek.com/archmailv2-kr/search", but it has been less reliable lately.
The KRnet list archive site is a list of all email messages posted in the last few years, listed chronologically. This archive is not as extensive and only goes back a few years, so it is best used as a backup.
The KRnet Archives is also run by John Bouyea, and has almost all of KRnet's correspondence since the earliest days.
A low-drag airfoil was recently designed specifically for the KR2S in a cooperative effort between several KRnetters and the University of Illinois. See details at the AS504x Airfoil Site
The KR Newsletter was published as a means to discuss ideas, building and flying techniques, etc. All issues are posted on the KR Newsletter page. Reproduction of the KR Newsletter artwork with permission of Larry Capps.
Rob Schmitt continues the KR education Kyle Micklewait got during Rob's KR orientation flight, a few minutes earlier. This is what the KR Gathering is all about...the opportunity for builders to talk to other builders and pilots, and toward completion, get a little KR stick time in to prepare for first flight.
This is South African KR2, ZS-VYZ, originally built by Martin Clark in 1985, owned by Ferdi Koekemoer when this was taken, and now owned by Rudi Venter. It is fitted with a 2400cc turbocharged and intercooled Volkswagen as well as a 59inch Hoffman in-flight adjustable prop. I must say it has aged well, for a 24 year old airplane! For more details, see Rudi's ZS-VYZ page
Don Reid has scanned and posted all known Sport Aviation articles dealing featuring KRs. While you're there, check out the rest of his highly engineered KR-2XL!
Rick Junkin, a professional F-15 test pilot, has published a KR2S Flight Test Plan especially for the KR2S. You'd be crazy not to read this before flight testing your KR. This is truly excellent work!
If you are getting ready to make your first flight, be sure to check out Jim Faughn's "How to make a Perfect KR Landing" site.
Rob Schmitt has posted a KR2S Pilot Operating Handbook, provided as a template for others to use.
KROnline is a FREE online electronic KR Newsletter devoted to sharing information with other KR builders and pilots in a timely manner. It is chock full of valuable information gained from the experience of many web oriented KR builders. Check it out!
There's a Word document that details KR accidents listed in the FAA's database, at http://www.n56ml.com/KRaccidents.doc , although it is several years old and use an update.
There is also a "CorvAircraft" list devoted to the Corvair engines in aircraft. You may subscribe by visiting http://list.corvaircraft.org/mailman/admin/corvaircraft_list.corvaircraft.org and subscribing online, or simply by sending an email to email@example.com. There are several Corvair experts on the list, and experimenters who are flying behind Corvairs in KRs, Pietpenpols, Zeniths, and Sonex's (Cleanex), and working to install them in several other homebuilt aircraft. The CorvAircraft email list archive is located at http://list.corvaircraft.org/mailman/private/corvaircraft_list.corvaircraft.org/ .
There is an alternative aircraft engine list devoted to the use of VW and 1/2 VW engines, as well as other automotive and motorcycle engines, in aircraft. For information on how to join, as well as access to their archives, visit the VW Aircraft Engine List Webpage. This is very good stuff for those interested in Volkswagen engines especially.
John Martindale of Australia, in formation with ...
Suppliers of KR parts:
nVAero, LLC, 23052H Alicia Parkway #413, Mission Viejo, CA 92692
Official supplier of KR parts, blessed by Rand Robinson. Manufacturer of the composite KR1, KR2 and KR2S parts, mechanical assemblies such as flap mechanism and control sticks, canopies, KR plans,, and kits.
Great Plains Aircraft, P.O. Box 545, Boystown, NE 68010 (402) 493-6507
VW based aircraft powerplants and accessories. Lots of good stuff that can't be found anywhere else, and at reasonable prices.
Corvair (Aircraft Engine) Authority, 5000-18 HWY 17 #247, Orange Park, FL 32003. (904) 529-0006
Corvair Conversion Manual, and all the parts to do the job.
Tracy O'Brien, LLC, 156 Bunker Creek Road, Chehalis, WA 98532
Supplier of KR-sized aircraft brake systems.
Grove Aircraft Company, 1860 Joe Crosson Drive, El Cajon, CA 92020, (1-888-432-7534)
Aluminum landing gear for KR aircraft
Ed Sterba Props, 513 68 Street, Holmes Beach, FL 34217, (941)-778-3103.
Wooden propellers for VWs and Corvairs. Props Inc., (541)-265-3032,
Wooden propellers for VWs and Corvairs, by Jeff Bertuleit.
7146 Sante Fe Avenue East, Hesperia, CA 92345 (760) 244-3074
VW based aircraft powerplants and accessories, cowlings
, 410 Pine St., Highland, IL 62249 (618) 654-7447
KR kits and components and many other aircraft parts, and my personal favorite (except their web site's obtuse).
Aircraft Spruce and Specialty, 201 W. Truslow Ave., Fullerton, CA 92632 (800) 824-1930
KR kits and components and many other aircraft parts
Wag Aero, 1216 North Road, Lyons, WI, 53148 (800) 558-6868
Wide selection of certified and homebuilt aircraft parts
Zenith Fuel Systems,
Ellison Fluid Systems,
Carburetor source (one of the best, and most expensive).
Another slide carburetor source (new on the scene and relatively inexpensive).
Advanced Composite Materials,
The most inexpensive source I know of to buy 5.85 ounce 48" wide carbon fiber ($17 per yard).
Sport Flyer's Internet Resources
Everything else you'd ever need to find to build an airplane...
This is Joe Horton's 3100cc Corvair powered KR2S as seen at the 2006 KR Gathering. Photo by Dave Mullins (the guy with the huge honkin' lense!).
This is Larry Flesner's 0-200 powered KR2S, which Larry built before the KR2S plans were available. The whole plane is "upsized" a little to meet Larry's 6'-4" frame, and there's still plenty of headroom left! The workmanship is outstanding, and this plane gave my 2700cc Corvair a good run for the money. I took this picture on the way to the Wicks open house in 2010, where we met Ron Highower, EAA's new president.
Mark Jones in his "Deer Slayer" KR2S, on the way to Oshkosh for Airventure 2009.
This is Richard Shirley's KR-1. This thing is nothing short of totally awesome, and his piloting skills are incredible, as well. There are more photos and details located on the 2001 KR Gathering web page.
Kim Neibauer in his newly minted KR2S, at the 2015 KR Gathering in McMinnville, Oregon.
Jim Hill's KR2 doing 200mph flyby at Hazel Green airport, trying to get a better look at the windsock. Jim's KR2 has now been stretched and converted to tri-gear.
Here's Netherlander Marcel Driessen flying his KR2S.
This is Marty Roberts in his 0-200 powered KR2. I took this picture from Jim Faughn's equally nice KR2.
This is Rick Lanning's KR2, the oldest flying KR, originally built by Dan Diehl in 1976.
Steve Glover flew his flawless KR2 all the way from California to make the 2004 Gathering.
This is Troy Petteway's O-200 powered KR2. It will do 230 mph flat out, mostly because of attention to aerodynamic detail. A careful study of this photo will show you how this plane differs from most other KRs. He is also flying the new AS504x airfoil.
This is Aussie Allen Buzza in his retractable KR2, flying formation with Peter Gilbert in his BD5 over Fremantle Harbor near Perth.
Nasser's United Arab Emirates KR2.
John Shaffer's "KR2SS" (super stretch) has retractable tri gear, and looks very sweet in flight. This is his second KR, and like many others, has a lot of neat ideas implemented in this one. There are more photos of it at 2004 MVN KR Gathering web page.
Here's Marty Roberts, Steve Alderman, and Jim Faughn flying formation near the Red Oak Iowa airport during the 2003 KR Gathering. There are lots more photos located on the 2003 KR Gathering web page.
This is Joe Horton's airplane at Sun N Fun 2010. Steve Glover sent this to me to show how much hotter Joe's plane seemed to be that year...
Sorry if there aren't enough bells and whistles for you on this page. I've tried to keep loading time to a minimum. As a former 2400 modem user, I'm acutely aware of the price we pay loading so many superfluous images, fonts, audio, and video flotsam and jetsam that all too often replace plain text. And while others are downloading annoying flashing banners and advertisements to you, I'm downloading helpful information for you.
Join the NEW KRnet email list by sending an email to firstname.lastname@example.org. After sending the message to the address above, you must reply to the resulting "confirm..." email that you'll receive. Once you have replied, you'll be subscribed, and no further action is required, but please read the follow-on "Welcome to the KRnet mailing list" email that follows, and then visit the fourth link that starts with " http://list.krnet.org/mailman/options/krnet_list.krnet.org/..." to YOUR subscription page. This is where you customize how the list works for you, such as changing your password or email address, unsubscribe, switch to the digest" version (all emails rolled into one big one, once per day or so), and that kind of thing. Then save, bookmark, or print the page so you can find it again later, and you won't have to bug me to change stuff for you!
The "welcome to the list" message asks for some personal information to help me verify that you are a real KRnetHead, and not just a spammer. If you've never sent that info to me, please do. If you're one of the regulars, I already know who you are, so don't bother. After the intial signup period of about a week, I'll be asking all new subscribers for that info. It will go no further than me, and will not ever be used for anything other than verification purposes.
This web site was established by Mark Langford in 1994, and was the very first site dealing with any of the KR series of aircraft, or even devoted to a particular experimental aircraft, for that matter. Please report broken links or offer constructive criticism to Mark at email@example.com.
Thanks, Mark Langford, ML "at" N56ML.com