Editing STOL (section)

==Kits==
[[File:VortexGenerators01.JPG|thumb|right|Micro Dynamics vortex generators mounted on the wing of a [[Cessna 182|Cessna 182K]]]]
A number of aircraft modification companies offer STOL kits for improving short-field performance.

*[[Crosswinds STOL]] of [[Wasilla, Alaska]], sells STOL kits for light aircraft, including [[leading edge cuff]]s, tip spill plates, inboard flap extensions and STOL fences. The company offers kits for [[Piper PA-12]], [[Piper PA-14 Family Cruiser|PA-14]], [[Piper PA-18|PA-18]], [[Piper PA-20 Pacer|PA-20 and 22]], [[American Champion Citabria|Bellanca Champion Model 7 series]], [[Cessna 170|Cessna 170B]], [[Cessna 180|180]] and [[Cessna 185|185]].<ref name="Crosswinds">{{cite web|url = http://www.crosswindsstol.com |title = Crosswinds STOL Inc.|access-date = 2011-02-23|last =Crosswinds S.T.O.L. Inc.|year = 2011}}</ref>
*[[Horton, Inc]], of [[Wellington, Kansas]], offers STOL kits under the brand name ''Horton STOL-Craft'', emphasizing that the modifications increase safety by allowing forced landings to occur at lower speeds and thus improve survivability. The Horton modifications include a drooped [[leading edge cuff]], conical cambered [[wingtip]]s, control surface gap seals and [[wing fence]]s. The company says: "On an average you can expect to get a 4-7 knot reduction in stall speeds. Flying at these lower stall speeds you can reduce the take-off and landing distances by 10%". Horton STOL kits are available for several [[Cessna]] and [[Piper PA-28]] models.<ref name="HortonDescription">{{cite web|url = http://www.hortonstackdoor.com/stolcraft_description.htm|title = Description of the Horton STOL Kit|access-date = 2009-12-26|last = Horton, Inc.|archive-date = 2008-11-21|archive-url = https://web.archive.org/web/20081121152728/http://www.hortonstackdoor.com/stolcraft_description.htm|url-status = dead}}</ref><ref name="HortonFAQ">{{cite web|url = http://www.hortonstackdoor.com/stolcraft_faq.htm|title = Frequently Asked Questions About the Horton STOL Kit|access-date = 2009-12-26|last = Horton, Inc.|archive-date = 2008-10-06|archive-url = https://web.archive.org/web/20081006174413/http://www.hortonstackdoor.com/stolcraft_faq.htm|url-status = dead}}</ref><ref name="HortonPrice">{{cite web|url = http://www.hortonstackdoor.com/stolcraft_pricing.htm|title = Horton STOL Kit Pricing|access-date = 2009-12-26|last = Horton, Inc.|archive-date = 2018-01-09|archive-url = https://web.archive.org/web/20180109004134/http://www.hortonstackdoor.com/stolcraft_pricing.htm|url-status = dead}}</ref>
*[[Micro AeroDynamics]] markets [[vortex generator]] modification kits for "STOL benefits". The Micro kits are small vortex generators that are glued to the wing leading edge, as well as the underside of the [[Elevator (aircraft)|elevator]] and on the fin. Kits are available for a large number of light aircraft types.<ref name="Micro">{{cite web|url = http://www.microaero.com/|title = Micro Vortex Generators for Single and Twin Engine Aircraft|access-date = 2009-12-26|last =Micro AeroDynamics Inc|year = 2009}}</ref>
*[[Sierra Industries]] sells Robertson STOL kits, marketed under the name R/STOL, incorporate a drooped leading edge cuff, wing fences, drooping ailerons and an automatic trim system. The company says that installation "allows 15 to 25 MPH slower approaches and requires up to 40% less runway distance". R/STOL kits are available for various Cessna models.<ref name="R/STOLAbout"> {{cite web|url = http://www.sijet.com/sitemap_rstol.aspx|title =Sierra R/STOL High Lift Systems for Piston Engine Aircraft|access-date = 2009-12-26|last = Sierra Industries|year = 2007}}</ref><ref name="R/STOL"> {{cite web|url = http://www.sijet.com/SierraRSTOL_performanceComparison.aspx|title = Sierra R/STOL Performance Comparison Charts|access-date = 2009-12-26|last = Sierra Industries|year = 2007}}</ref><ref name="R/STOLMods"> {{cite web|url = http://www.sijet.com/d563beaf-cce6-4770-9feb-e4bf0c42bc76.aspx|title = Modifications - Sierra R/STOL High Lift Systems for Piston Engine Aircraft|access-date = 2009-12-26|last = Sierra Industries|year = 2007}}</ref>
*[[Stolairus Aviation]] of Kelowna, British Columbia, has developed STOL Kits for the [[de Havilland Canada DHC-2 Beaver]] and [[de Havilland Canada DHC-3 Otter]] to increase lift and reduce stall speeds. The DHC-2 Beaver STOL Kit includes a contoured leading edge, flap-gap seals, wing fences and drooped wingtips. The DHC-3 Otter STOL Kit includes a contoured leading edge and drooped wingtips.<ref>[http://www.stolairus.com "DHC-2 Beaver."] Stolairus Retrieved: February 2, 2012.</ref>