Saalfield SEE Skyskootor
1932 = Two paddle-wheels of helices and a motorcycle engine reportedly got this contraption going almost 150mph. No other data found, but that alone is impressive, especially if it was in the air!
SX-1 1970 = 2pClwM rg; Lycoming O-290-G4; span: 30'0" length: 21'6" v: 234/145/x. Home-built using parts of Culvers PQ-14 and V, and Cessna 150. Cost of construction: $2,500. POP: 1 [N25RS].
Sabreliner [N4060K] (Sabreliner)
S A C
Special 1950 = 1pOB; 85hp Continental C-85; span: 20'4" length: 16'2" v: 130/118/43 range: 350; ff: 2/14/50 [N3900x]. POP: 1, as aerobatic Roberts Special (p: Charles Roberts).
J-1 Jeanie 1955 = 1pClwM; 90hp Franklin 4AC; span: 23'0" length: 19'11" load: 700# v: 120/105/55 range: 200; also with 65hp Lycoming O-145-B2; v: x/90/40. Modified wings and tail from Piper J-3; tricycle gear, strut-braced wing [N33130].
A-22 Lasa 1989 = 1pCmwM rg; 300hp Chevrolet V-6 pusher. span: 22'0" length: 15'8" load: 1300# v: 190/x/72 range: 300; ff: 10/8/89. POP: 1 [N22AB]. Light-armed, twin-boom surveillance aircraft.
Piranha 19?? = UAV-19-50 19?? = No data.
Vampire 19?? = Wing research. No data.
Safety SEE Arrowhead and Capelis
SW-1, -2 1937 = 2pCM; 40hp Continental A-40. POP: 1, modified as SW-2 with 60hp Milwaukee Tank [NX18220].
Saginaw SEE Carr
1935 = 1pOM; 30hp Sagstetter. POP: 2 ultralights with identical specifications, and home-built (or modified) engines, but with serial numbers enigmatically rearranged:  c/n 15207 registered to Raymond,  c/n 12570 to Clarence.
Firefly 1929 = Reported as being a near-duplicate of JT-1, credited first as Robinson-Christensen-Wright Firefly, but apparently not completed by that team and finally finished by Robinson; sold in 1930. ( John M Jarratt 3/19/02)
JT-1 1929 = 3pOB; 90hp Curtiss OX-5; span: 30'0" length: 22'0". [X468E]; reg expired 9/1/35.
St Louis C2-60 as C2-110 [NC951K] (Frank Rezich coll)
C2-65 1929 = Modified C2-60 [C1111].
St Louis C2-85 Cabin (Dan Shumaker)
C2-90 Senior Cardinal 1929 (ATC 264) = 2pChwM; 90hp LeBlond 7D; length: 21'3" load: 545# v: 118/102/40 range: 300. Harry McKay. $3,750; POP: 6, with 1 converted from C2-60.
C2-100 Super Cardinal 1929 = 2pChwM; 110hp Warner Scarab. POP: 1 conversion [X12319] for factory tests.
C2-110 Super Cardinal 1929 (ATC 277, 2-188) = Plush version of C2-90 with 100hp Kinner K-5; span: length: 20'6" load: 557# v: 125/107/39 range: 475. $4,250; POP: 6, with 1 converted from C2-60; 1 as C2-100 Special under (2-188).
PT-15, PT-1W - 2pOB; 225hp Wright R-760; span: 33'10" length: 25'0" load: 708# v: 124/105/53 range: 355 ceiling: 14,500'. Company model designation was PT-1W.
St Louis XPT-15 [39-702] (USAAC Wright Field)St Louis PT-35 [NX11778] (USAAC Wright Field)
PT-35 1935 = 2pOB; 225hp Wright R-760. Entered in military evaluation for a primary trainer, but was beaten out by lookalike Stearman [NX11778].
PT-19A 1942 = Contract production of Fairchild PT-19 [42-50027/50070].
St Louis PT-LM-4 10 [NX25500] (NACA/NASA)
Susie Bee 1967 = 1pOB; Lycoming O-290-G; span: 15'5" length: 15'2" v: 170/145/65 range: 450; ff: 7/2/67. POP: 1, built over a period of six years for $2,000 [N1116U].
1927 = 1pOB; 15hp Pope motorcycle engine; span: 20'0" length: 13'0". Home-built ultralight.
Monoplane 1918 = No data found.
Salvay-Stark Skyhopper 10 [N41770] (clip: EAA Experimenter)
Skyhopper 11 1959 = 2pClwM version of Skyhopper 10 with 26'4" wing and 65-85hp Continental; also 108-125hp Lycoming. [N197N, N4787T], possible others.
SL-1 1935 = 2pCM; 90hp Wright Gipsy. [X14525]. Reg cancelled 11/1/35. Possible connection with Breese 5?
B Special MSL-2 1962 = 2pOB. POP: 1 [N246H] c/n MSL-2.
Sampson Wildcat  (EAA coll)
Sport 19?? = Hall-Scott; [119M]. No data found.
Curtiss Pursuit 1918 = OX-5 powered mystery ship, unrelated to Curtiss Co. Though to be a rebuild or modification from something surplus, possibly JN-4, and named for its motor. Bought by B Larsen and E E Terrell of Oakland in 1928 and registered [C471] c/n TL100sub. Reported overhauled in 1929; reg cancelled by CAA 5/7/30 for unspecified reason..
R-1, Flier 1913 = No data except Hall-Scott "80" motor, and flown at Grand Junction CO on 9/23/13 by William Blakeley.
E 1930 = Wrecked Travel Air 3000 with a Hisso rebuilt by Club members and reregistered [837Y] c/n 29.
1925 = 3pOB; 90hp Curtiss OX-5. No other data than it had "flaperons," might have been a rebuild of a WW2 surplus ship.
Santa Ana VM-1 [X4564] (clip: Orange Co Airport brochure)
Commercial 1922 = 6pO/CB; 350hp Liberty; span: 43'6" length: 30'2"; load: 1960# v: 125/x/45. Omer Woodson. Pilot in an open cockpit behind the cabin. POP: 1.
Saturn Meteor II [N9700C] (Aero Digest)
Saul Triad [X808M] (Joe Juptner coll)
Savoia, Savoia-Marchetti, American Aero
Savoia S-31 (magazine clip)
Savoia S-55 [NC175M]
S-56 1929 (ATC 287, 2-95, 2-96, 2-332) = 3pOBAm; 90hp Kinner K-5; span: 34'1" length: 25'0" load: 699# v: 86/75/40 range: 290 ceiling: 7000'. $7,375 with starter and nav lights; POP: 25 [NC192/194M, NC324N/325N, NC349N, NC352N/356N, NC371N, NC378N, NC380N, NC382N/383N, NR898W, NC900V/906V, NC908V], of which 3 converted to S-56-B and 1 to S-56-C. (2-95) and (2-96) for initial production models,.
Savoia S-56-B [NC897V] (Joseph Juptner coll)S-62 1928 (ATC 2-320) = 8pCBFb; 500hp Isotta-Fraschini Asso pusher; span: 50'10" length: 36'1" load: 2530# v: 132/118/49 range: 530. POP: 1 [?] c/n 6202. ATC issued in 1931.
A 1935 = 1pOM; 65hp Velie M-5; no specs.  c/n 3. Crashed at Waukesha WI and reg cancelled 10/20/36.
Skyjacker II 1975 = 2pCmwM flying wing; 200hp Lycoming IO-360-A1B6D pusher; span: 18'0" length: 17'6" load: 685# v: x/x/45; ff: 7/3/75. [N7317].
SCALED SEE Rutan
Schad Not great pix, but all we could find (clips via J M Jarratt)
S-350 Mini-Swat project 1981 = 1pCmwM; 400hp Avco Lycoming IO-720-B1B. Did any of these or other Schapel projects fly?
S-525 Super Swat twin-boom project 1980 = 1pCmwM; 680hp P&W PT6A-15AG pusher.
S-882 Flying Wing project 1985 = 1pM; 180hp turbo Mazda rotary pusher; span: 34'0" load: 612# v (est): 223/192/67 range (est): 1150. POP: 1 built to full scale [N882SA]; flight unknown.
SA-981 Swat twin-boom project 1981 = 1pCmwM rg; 850hp PT6A-41 pusher.
S-1080 Thunderbolt project 1980 = 4pCmwM rg; 528hp P&W PT6A-112 pusher.
S-1275 Finesse twin-boom project 1981 = 2pCmwM; 420hp Continental Tiara pusher.
1951 = 1pClwM; 85hp Continental C-85; span: 16'0" length: 14'10". Paul Schaupp. Fiberglass fuselage midget racer Mr Zip (p: Bob Pflieger) [N32C].
1931 = 2pOhwM; 120hp Salmson 9. Al Schauss. Scratch-built with no prior knowledge or experience (even the hand-carved propeller), this was also the parasol in which Schauss learned to fly (after its test flight by flight instructor Wally Neuman). Destroyed in a hangar fire .
Schauss A  (Rhodes Arnold via Skyways)
Schauss-Lampman Sport  (Frank Rezich coll)
Flexhub 1963 = 2pOH; 85hp Continental C-85; rotor: 22'9" (?>23'0") length; 18'6" load: 470# v: 85/75/0 range: 170. Blades set on rubber bushings instead of conventional ball- and roller-bearings. POP: 1 as a described "test-bed" version of Model B [N564A].
Scheutzow Bee [N592A]
RS 1917 = Pursuit trainer based somewhat on French V-strutted Nieuport design. 1pOB; US-built 100hp Gnöne 9; span: 26'6" length: 20'0"; ff: 12/9/17. N B Robbins. $11,000 (reported); POP: 1. Bought and tested by the Army, but rejected as not being as good as Orenco or Thomas-Morse. Spelling sometimes seen, erroneously, as Schaefer or Scheifer.
c.1914 = 2pOB; span: 50'0" length: 40'0"; no other data. POP: reportedy 2 landplanes and 2 "hydroaeroplanes" used for exhibitions around Long Island NY, one with innovative aluminum body and 15° sweptback wings. Schill, a well-known auto racer at the time, first designed and built an 80hp V-8 aviation engine in 1912 for Max Ames Machine Co, Mt Vernon NY. Studied aviation in Europe for five years, moved to Milton VT c.1920. c.1922 - Motor-glider, with no data. Was destroyed before it ever flew when its hangar collapsed in a windstorm.
B-1 1931 = 3pOB; 90hp Curtiss OX-5 [783Y] c/n 1. Likely a modified Curtiss JN-4 used for barnstorming rides locally.
Schill Gull Wing [X6929] (poor quality clip from film)
Schmidt (Sandra Seino coll)
Schmitt Mono and biplane (ad: 1915 Flying)
Schmuck S-1 at Callies Flyers airport (L.A.) 1928  (B C Reed)
Schmuck S-3(?) 
WCK-2 Sportster (West Coast Co) 1930 = 2pCM; 100hp Kinner K-5. Parasol wing. POP: 1 [X10526] c/n 2. According to historian John W Underwood, "It came to grief in the hands of an aspiring test pilot named Tony LeVier."
1928 = 2pCB; 100hp Hall-Scott. Noted in a magazine ad selling new for $450. Purchased by Garland Lincoln  c/n 1.
Schoenfeldt SEE Rider R-4
Schofield Albatross SEE Zenith Z-12
Schramm SEE RotorWay
Schreck SEE Viking V-2
1953 = 1pOmwM; 85hp Continental C-85; span: 15'4" (?>19'4") length: 19'0" (?>17'8"). All-metal midget racer Rarebird II [N16N].
Dragontail 1950 = 1pClwM; 85hp Continental C-85 pusher; span: 20'4" length: 18'6". All-metal, Y-tailed midget racer; destroyed in testing 8/2/50 [N60298].
Schroeder Cyclogyro (Peter M Bowers coll)
Air Mate c.1959 = Home-built. 1pClwM; span: 24'0" v: 125. All-metal; no other data. [N5751N].
SEE ALSO Mercury (Aerial Service)
1929 = 2pOhwM; 130hp Comet 7-RA; span: 57'0" length: 28'0" load: 650#. Harvey Mummert, R W Schroeder. First had a tandem landing gear with outriggers, then a tricycle gear; Schroeder-designed automatic variable-pitch prop. Constructed at the parent Mercury Corp as a variable-camber wing design for entry in the Guggenheim Safe Aircraft Competition, withdrawn after a crash during testing [X58N].
Der Fledermaus c.1975 = 1pOlwM; 36hp VW; span: 21'0". [N7873].
1-30 1958 = 1pClwM; 65hp Continental A-65; span: 40'7" length: 20'6" load: 410# v: 110/100/38. $6,000. POP: 1 [N3840A].
2-31 c.1960 = 2pClwM; span: 36'0". POP: 1 [N10360].
2-69 199? = 2pCH. No data.
Schweizer 300C [N2049D] (Schweizer)
Schweizer 300CBi [N69A] (Schweizer)Schweizer 330 [N330TH] (Schweizer)
330 19?? = 3-4pCH; Allison 250-C20W; rotor: 27'6" v: 230/213/0 range: 367 ceiling: 11,200'.
Schweizer 333 [N333UC] (Schweizer)
Schweizer SA-2-37B [N2061L] (Schweizer)
TSC-1A2 (Teal II) 197? = 2pChwMAm; 150hp Lycoming O-320A; span: 31'11" length: 23'7" load: 565# v: x/110/52 range: 470 ceiling: 12,000'. $22,475 in 1974.
X-26 c.1975 = No data found on 2-32 gliders delivered to Naval Test Pilot School, assumably (but unverified) for conversion to power with 100hp Continental as "quiet" surveillance craft, on the order as the sole Lockheed X-26B. POP: 5 for USN as X-26A [157932/157933, 158818, 159260, 161571].
Scott creations (see sidebar)
XS-1 Ol' Ironside 1969 = 1pChwM; 85hp Continental C-85; span: 19'9" length: 17'10" load: 405# v: x/135/x; ff: 11/22/69. [N1879].
Monoplane 1929 = 2pClwM; 300hp Hisso H; span: 36'0" length: 27'0" v: 200/165/45. M C Tunison. Uncommonly sleek design for the time had a sparless wing. Plans by this investment group to revive production of Tunison Scout (qv) never got implemented in the face of the Depression, and only the Tunison original appeared at a few expositions under two registrations [X247E/X425]. It shows up in 1934 as 3p Zion Tunison Scout [X13795], with a Miller racing engine and a factory address at Elsinore CA.
Stardust 1954 = 1pClwM midget racer as Stardust; span: 16'0" length: 17'6" v (racing): 158.17. [N85N], nonfatal crash during race at Niagara Falls NY on 7/4/56.
Scraggs Last Laughi 1/72 model (Claudio Luchina)
Le Petrel 198x = 1pOBFb. [N16017].
Searey [N81062] (Roger Cain)
Seattle SEE Mohlar
1948 = 1pOmwM flying wing; pusher engine; v: x/65/x. Empty wt: 150#.
Wee Wing 1949 = 1p all-plywood ultralight flying wing with wingtip tails. Airframe was reportedly built for less than $100.
Security-National S-1-A [NC14229] (Frank Rezich coll)
Security-American S-1-B [NX28967]
Seibel1943: (Charles M) Seibel, Kenmore NY (while working for Bell Co). 1946: Wichita KS (while working for Boeing Co on XL-15). 1948: Seibel Helicopter Co Inc, Wilson Field, Wichita; 1949: 5613 N Broadway, Wichita; 1951; 3400 N Broadway, Wichita. 1952: Acquired by Cessna Aircraft.
H-24 SEE S-4.
S-1 1943 = Twin-tilt rotor looking quite (or understandably?) like the current Bell VS-22. Preliminary first design, patented in March 1944.
S-2 1947 = 1pOH coaxial design study. No specs or data found.
Seibel S-3 [NX735B] (Eaton Chronicles)
Seibel S-4A (Eaton Chronicles)
S-4A 1950 = 2-3pO-CH; 125hp Lycoming O-290-B; length: 24'6". POP: 1 [N5153] c/n 2. Flight tests by CAA's Hal Hermes.
JS-1 1978 = 2pOB; 108hp Lycoming O-235; span: 26'0" length: 17'0" load: 573#.
Quadroplane 1927 = 1p quadruplane with a two-cylinder motor had a total surface of 100sqft. Reported to have burned while being started for its trial flight. There might be a filial connection between this and the following entry, but no explanation exists about the spelling differences in their or their planes' names.
1913 = 1pOmwM; Elbridge 4. A Blériot redesign, it flew successfully, but his follow-on creation, based on a French Nieuport Centre-Wing with an Anzani motor, didn't fare as well. Pathè movie newsreel cameraman Curtis Pritchard convinced him he should be its test pilot, despite never having flown before. Sellick relented and, after some verbal flight instruction, watched Pritchard take-off too soon and too abruptly, with the inevitable splintering crash. Pritchard suffered a broken leg, but the plane was a total loss.
Sellers working on Quadruplane (clip: 1923 magazine)
Incubator 1929 = 1pOhwM; 28hp Lawrance. Home-built based on Pietenpol, with a pivoting wing for minimum storage requirement. Created for use by Sellmer's son in his duties as a Fish & Game Dept warden. POP: 1 [512K].
1909 = 1pOmwM; 40hp Selvage. Hardly more than an open framework with a wire-braced wing attached, reportedly built by a local mechanic, Alfred Peterson, but a 11/19/09 newspaper photo shows it in flight.
300 19?? = 2-4pClwM rg; 235-300hp various; span: 30'0" length: 25'0" load: 1000# v: x/260/69. David B Thurston. Composite and steel-tube fuselage, all metal wings and tail. Aerobatic capability. POP: ??. Kits and plans available for home-builders, as well as the finished airplane.
302 Kodiak 19?? = 4pClwM rg; 235-300hp various turbocharged; span: 30'0" length: 25'0" load: 1350# v: x/255/72.
Falco F.8L c.1980 - Kits and supplies for Italian 2pClwM home-builder sport plane.
Seraph SEE Bennett
1922 = 1pOB; Indian V-2. Bicycle wheels, wing-warping controls. POP: 1, plus another modified version built in 1925 at Forsyth IL.
1925 (Owensburg) = 2pOB; 80hp Anzani.
Loadmaster c.1960 = 4pChwM; 450hp P&W R-985; span: 40'6" length: 31'7" load: 2160# v: x/115/50; conversion of Convair L-13. POP: 1 known [N2544B], maybe others.
1926 = Curtiss JN-4D modified with a combination roller-and-ski landing gear. POP: 1, damaged in landing tests 2/10/27 and scrapped. Spelling of de Seversky's name was deliberate to play up the ski angle.
Monoplane 1911 = 1pOhwM. Cantilever wing with underslung ailerons; open-frame fuselage.
Shaffer SEE California Aero
3-B 1929 = 4pChwM; 110hp Warner Scarab; span: 36'6" length: 25'10" load: 900# v: 115/85/45 range: 380. $6,500. This might well be the IAC Special repowered.
IAC Special 1928 = 1p unknown type; 90hp Curtiss OX-5 [X4966] c/n 100.
Special 1948 = 1pCmwM; 85hp Continental C-85; span: 19'4" length: 16'7". Midget racer [N5489N], reportedly never raced.
Meteora c.1968 = 2pCH; 75hp Continental C-75; rotor: 23'0" length: 19'0".
Shaw Flying Boat (Drina Welch Abel coll)
1915 = Photos of a flying boat and a pusher identified only as Comet.
A sportplane, the Shaw flying boat was rather different from other American flying boats in design, as well as construction. Typical was the very short fuselage of the hull, formed as a gliding airfoil, but in its bow was a three-cylinder, two-stroke, water-cooled, 90hp Johnson covered with an aluminium top. Just behind the motor was the radiator, and behind that two tandem cockpits with dual-controls, then the pusher prop operated by a long shaft and chain.
Wings were linen-covered wooden frames with two spars, the front one of which as a layer of ash between two layers of spruce. Leading edges were made of five layers, four spruce and one ash, all secured by steel wire. Wood struts had a streamlined cross-section and were made from three layers of ash and two of spruce. Only the upper wing had ailerons. Tail section was rather compact and set at an angle to avoid trailing in the water. The lifting tailplane had an elevator in two parts, a stabilizer in three parts, and a balanced rudder. All were covered with linen. Both the lower wings and the tail section were attached to the fuselage with steel pipes, and on both sides of the fuselage a section of the lower wing was uncovered to provide a handy downward view.
Fuselage was an ash and spruce frame covered with mahogany three-ply having a center layer of linen, and the deck's bow was covered with linen. Fuselage length was about 6 meters and had a hollow V-bottom with one step. Behind that step the bottom was flat. (-- Willem Beerling 3/1/01)
Parasol 1930 = Home-built. 1pOlwM; Heath-Henderson, later replaced by Anzani. V-strut-braced wing. POP: 1 [911V] c/n 4. Reg cancelled in 1935.
Skeeter X-1 1970 = 1pOhwM; 72hp VW; span: 22'0" length: 13'6" load: 280# v: 85/75/42 range: 160; ff: 4/x/70 [N117].
Sheldon Special SEE Johnson Special
Shelton SEE American Gyro
SC-1 Sportcraft 1938 = 2pOlwM; 65hp Velie M-5. .
Sherpa 8 Room for 8 (Sherpa)
Sherpa [N711SA] (Roger D Cain)
300 2001 = STOL. 6pChwM in development at the time as a marketed kit.
2006 - Smithsonian directory of manufacturers shows Sherpa models as K-200, K-300, C-400, T-411, C-500T, K-500T, without specs or descriptions, so there is much to be researched to bring this entry up to date.
2150A 1960 = 2pClwM; 150hp Lycoming O-320. Data similar to Morrissey 2150. Became Varga 2150A. POP: 37.
Big Cootie 196? = 1pOB; 65hp Lycoming, later 80hp Continental A-80; v: 120/90/63 (65hp). [N84Z].
c.1910 Shneider Postcard (Edward Hindman coll)
Willie II 1971 = 2pOB; 180hp Lycoming O-360-A3A; span: 20'0" length: 19'0" load: 494# v: x/150/60 range: 375.[N7919].
S-1 1929 = Monoplane with 80hp LeRhône rotary; span: 32'0" length: 25'0"; ff (assumed): 5/30/29. [717K] c/n 5, reg cancelled 7/14/30.
Shreck SEE Viking
Shriver (Renèe Gregory Batson coll)
Sidewinder SEE Smyth
RS1 Ilse 1971 = 4pChwM; 180hp Lycoming O-360; span: 28'0" length: 21'6" load: 907# v: 170/150/73; ff: 6/x/71 [N3087].
Standard 1919 = Likely a surplus Standard J-1 modified to accommodate the company's business of aerial surveys. Eliel later went on to become president of Fairchild Aerial Surverys, according to John M Jarratt's findings.
Sierra San Franciscan [R7713]
Sierra S-1 SEE Acme
SRC-1 1962 = 1pCmwM; 85hp Continental C-85-12J; span: 17'0" length: 20'0" load: 330# v: 200/170/85 range: 500; ff: 11/2/62. Earl Chelsea, Gerard Rogers, Herman Siersma. Eleven years in construction! POP: 1 midget racer [N4190C].
Special c.1970 = 1pOB. [N1175].
1984 = Kit-built. 1pClwM; 44hp Rotax 447; span: 31'20" length: 19'4" v: x/120/52 ceiling: 14,000'. Composite construction. POP: ??, prototype [N84TR].
Milwaukee #2 c.1910 = No data other than photo caption: "Pendulum system 120hp engine."
1928 = 2pOhwM; 90hp Curtiss OX-5; span: 41'3" length: 26'9" load: 682# v: 110/90/32; ff: 4/15/28 (p: Edward Euler). H C King. Later with 150hp Wright-Hisso (load: 968#). Utilized a Curtiss JN-4 fuselage and gear. Spin-proof, the company claimed, with a heavy, laminated spar that would withstand dives up to 175mph. POP: 1  c/n SWM-100. Press releases told of two cabin versions under construction, but were apparently unfinished.
FS Special 1930 = Kit version of Crawford A-1 with LeRhône. POP: 1 [774W] c/n S-2, reportedly never completed.
SP-1 Sport Monoplane 1928 = 2pOM; Super LeRhône static; span: 36'6" length: 21'9".  c/n 61, reg cancelled 7/22/30.
Simplex K-2-C (Joe Juptner coll)
Simplex K-2-S (Joe Juptner coll)
R-2-D Red Arrow Dual Plane aka Simplex Racer 1929 = 1pOB/hwM; 165hp Wright J-6; (as monoplane) span: 32'9" length: 21'0" load: 700# v: 140/125/50 range: 600; (as biplane) load: 1250# v: 125/110/45 range: 700, or 225hp Wright J-6; (as monoplane) v: 165/150/50 range: 550; (as biplane) v: 150/135/45 range: 650. Interesting concept of a convertible monoplane/biplanetop shoulder wing was permanent, 24'0" lower wings could be easily added for increased lift and load-carrying. POP: 1, flown as monoplane racer with 225hp Wright in the 1929 Nationals events with clocked pylon speeds of more than 220mph [NR43M] (p: Dick Myhres).
S-2 Kite 1929 = 1pOlwM; 40hp 3-cylinder Szekely SR-3. Omer Woodson. A probe into the inexpensive, ultralight aircraft market. Uncovered, girder-like fuselage; thick, cantilever wing. POP: 1 [X489M] c/n 1002. Simplex failed to get anywhere with the project, but the idea went with Woodson and company test pilot Myhres when they left in 1930 to form Cycloplane Co (qv).
Special 1928 = 3p unknown type; Dayton Bear. [X7860] c/n 22.
Simplex W-2-S [NC371V] (Frank Rezich coll)
W-5-C 1929 = 5p unknown type with 225hp Wright J-5B, possibly a competition version of W-2-S. POP: 1 [X547E] c/n 32-C.
Maverick 195? = 2pChwM. No data. [N2924V].
Special 195? = 1pOlwM; 85hp Continental C-85. [N12V].
Sindlinger HH-1 Hurricane (Tom Jensen coll)
Special #1 1959 = 1pClwM; 65hp Continental, later 75hp A-75; span: 20'4" length: 16'5" load: 336# v: 145/120/63; range: 524; ff: 4/10/59 [N6448C].
S-1 1931 = 1pOM; 36hp Chevrolet.  c/n 1-T.
Sino Swearingen SEE Swearingen
Coupe 60 1930 (ATC 2-81) = 1pChwM; 65hp Velie M-5. POP: 1 carried over from Kari-Keen inventory.
Coupe 90, 90-A 1931 = 2pChwM; 90hp Brownback Tiger; span: 30'0" length: 23'0" load: 533# v: 115/100/45 range: 400. Reorganization of Kari-Keen Aircraft Co, this was a slight variation of the Kari-Keen 90. Swen Swanson, redesign by Gazley & LaSha. $3,355; POP: 1 [NC10544]. Repowered with 110hp Warner Scarab.
Coupe 90-B Junior 1931 (ATC 414) = 2pChwM; 90hp Warner; span: 30'0" length: 23'0" load: 530# v: 115/98/45 range: 400. $3,500; POP: 1 [NC10721]. There are reports that a 90hp Lambert was also installed at one time, perhaps by some owner at a later date.
Coupe 90-C Senior 1931 (ATC 2-356) = 2pChwM; 110hp Warner Scarab; span: 30'0" length: 23'3". POP: 1 [NC10735].
SF-1 Pipit 197? = 2p?. No data.
SF-2 Whistler 1973 = 2pChwM; 62hp VW 1834cc; span: 30'0" load: 500# v: 95/86/43; [N5549].
SF-2A Cygnet c.1977 = Improved version of SF-2. 2pChwM; 62hp Barker-VW 1834cc; span: 30'0" length: 19'0" load: 515# v: 108/100/48. [N191S].