headquarters bellflower california united states products aircraft propellers website www.ivoprop.com ivoprop corporation founded in 1984 by ivo zdarsky is an american manufacturer of composite propellers for homebuilt and ultralight aircraft as well as airboats . the company headquarters is located in bellflower california . 1 2 zdarsky started the company after carving his own propeller for a homebuilt ultralight trike that he flew from cold war czechoslovakia over the iron curtain to vienna in 1984 . the company has sold over 20 000 propellers since then . 1 2 the company s propellers are built from carbon fiber reinforced polymer and feature a stainless steel leading edge . 1 2 contents 1 ivoprop variable pitch propeller 2 see also 3 references 4 external links ivoprop variable pitch propeller edit ivoprop produce both in flight adjustable and ground adjustable propellers of unusual design . whereas conventional variable pitch propellers rotate at the blade root the ivoprop design has its blade fixed . the blade is hollow containing a steel torsion rod fixed to the blade tip . by mechanically turning the rod within the hub a twist is achieved which adjusts the blade s angle of attack . 3 see also edit list of aircraft propeller manufacturers references edit a b c purdy don aerocrafter homebuilt aircraft sourcebook page 84 . bai communications . isbn 0 9636409 4 1 a b c bethea jim n.d. . the ivoprop story . ultraflight magazine . retrieved 8 february 2012 . ivoprop ivoprop quick ground adjustable medium propeller retrieved 26 february 2012 external links edit official website retrieved from https en.wikipedia.org w index.php title ivoprop & oldid 673894766 categories aircraft propeller manufacturersaerospace companies of the united statesbellflower californiacompanies based in los angeles county californiamanufacturing companies based in california1984 establishments in californiacompanies established in 1984 navigation menu personal tools not logged intalkcontributionscreate accountlog in namespaces article talk variants views read edit view history more search navigation main pagecontentsfeatured contentcurrent eventsrandom articledonate to wikipediawikipedia store interaction helpabout wikipediacommunity portalrecent changescontact page tools what links hererelated changesupload filespecial pagespermanent linkpage informationwikidata itemcite this page print export create a bookdownload as pdfprintable version languages add links this page was last modified on 31 july 2015 at 06 29 . text is available under the creative commons attribution sharealike license ; additional terms may apply . by using this site you agree to the terms of use and privacy policy . wikipedia is a registered trademark of the wikimedia foundation inc. a non profit organization . privacy policy about wikipedia disclaimers contact wikipedia developers cookie statement mobile view