St Croix Aircraft

{{Short description|American aerospace manufacturer}}

{{Use mdy dates|date=January 2022}}

{{Use American English|date=January 2022}}

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| name = St Croix Aircraft

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| fate = Out of business

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| location_city = Corning, Iowa

| location_country = United States

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| industry = Aerospace

| products = Aircraft propellers, aircraft plans and kit aircraft

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St Croix Aircraft, was an American manufacturer of wooden propellers for homebuilt and ultralight aircraft and a supplier of aircraft plans and kits. The company headquarters was located in Corning, Iowa.Purdy, Don: AeroCrafter - Homebuilt Aircraft Sourcebook, pages 85 and 247. BAI Communications. {{ISBN|0-9636409-4-1}}Cliche, Andre: Ultralight Aircraft Shopper's Guide 8th Edition, page E-15. Cybair Limited Publishing, 2001. {{ISBN|0-9680628-1-4}}{{Cite web|url = http://virtualultralightmuseum.com/e.htm#excelsior|title = Excelsior|accessdate = 9 February 2011|last = Virtual Ultralight Museum|date = n.d.}}Downey, Julia: 1999 Plans Aircraft Directory, Kitplanes, Volume 16, Number 1, January 1999, page 67. Primedia Publications. ISSN 0891-1851

The company's propellers were constructed from birch, maple and walnut and available in with two to five blades, in diameters up to {{convert|120|in|m|2|abbr=on}} for engines up to {{convert|400|hp|kW|0|abbr=on}}

St Croix is probably best known for its Excelsior ultralight aircraft design.