BROWN JR ENGINES
 Book Example |
Brown A (1931) .601 inch spark - Sand cast case - Brazed up cylinder with flared venturi - Horizontal tank - early engines were ringed, later lapped piston - Engines varied in detail as design was developed - Serial numbers A1 to aproximately A12 - REPROS EXIST |
 S/N A2 |
 Book Example |
Brown Jr. B (1934) .601 inch spark - Die cast crankcase and back cover - Straight venturi with choke nut - All cylinder fins same diameter except top fin which is smaller- "Brown Junior Motors" logo stamped around cylinder boss on case - Point spring forms large loop below timer - Horizontal fuel tank - Mounting lugs .090" thick - Serial numbers stamped on top front of left mounting lug - Serial numbers B1 thru B1000 |
 S/N B484 |
 Book Example |
Brown Jr. B (1937) .601 inch spark - Die cast crankcase and back cover - Mounting lugs .125" thick - Straight venturi with choke nut - All cylinder fins same diameter except top fin which is smaller and lower cylinder fin which is also smaller - "Brown Junior Motors" logo stamped around cylinder boss on case - Point spring forms large loop below timer - Cadmium plated brass "pot" fuel tank replaced horizontal tank - Bypass "tacked" on before final brazing - Serial numbers stamped on top front of left mounting lug - Serial numbers B4001 thru B5550
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 S/N B5427  S/N B4709* |
 Book Example |
Brown Jr. B (1938) .601 inch spark - Die cast crankcase and back cover - Mounting lugs thickness increased to .165" - Straight venturi with choke nut - All cylinder fins same diameter except top fin which is smaller and lower cylinder fin which is also smaller- "Brown Junior Motors" logo stamped around cylinder boss on case - Point spring forms large loop below timer - Cadmium plated brass "pot" fuel tank - Bypass "tacked" on before final brazing - Serial numbers stamped on top front of left mounting lug - Serial numbers B5551 thru B7600
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 S/N B5770 *  S/N B5875 |
 Book Example |
Brown Jr. B (1939) .601 inch spark - Die cast crankcase and back cover - Mounting lugs .165" thick - Straight venturi with choke nut - All cylinder fins same diameter except top fin which is smaller and lower cylinder fin which is also smaller- "Brown Junior Motors" logo stamped around cylinder boss on case - Lapped piston - Cadmium plated cylinder - Plastic fuel tank replaced brass "pot tank" - Die cast vertical timer with no bump on back of casting - Bypass "tacked" on before final brazing - Serial numbers stamped on top front of left mounting lug - Serial numbers B7601 thru 3B999 (Pictured engine has popular accessory exhaust extension) |
 S/N 2B60 |
 Book Example |
Brown Jr. B (1941) .601 inch spark - Die cast crankcase and back cover - Mounting lugs .165" thick - Straight venturi with choke nut - All cylinder fins same diameter except top fin which is smaller and lower cylinder fin which is also smaller- "Brown Junior Motors" logo stamped around cylinder boss on case - Lapped piston - Cadmium plated cylinder - Plastic fuel tank - New style die cast vertical timer with bump on back of casting - Bypass "tacked" on before final brazing - Serial numbers stamped on top side of left mounting lug - Serial numbers 10B00 thru 22B00
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 S/N 10B93 |
 Book Example |
Brown Jr. B (1945) NOTE: Post war engines built by Les Meyers Hobbies from remains of stock after Junior Motors closed - First releases were identical to 1941 models and later versions used the Hurleman timer - Only "B" models were assembled post war |
 S/N 22B3* |
 Book Example |
Brown Jr. C (1937) .601 inch spark - Die cast crankcase and back cover - Mounting lug thickness .125" thick - Straight venturi with wire needle valve at end of venturi and no choke nut - "Brown Junior Motors" logo stamped around cylinder boss on case - Point spring forms large loop below timer - Cadmium plated brass "pot" fuel tank - Ringed piston - Serial numbers stamped on top front of left mounting lug - Serial numbers C10000 thru C12500
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 S/N 10402C  S/N C11461 |
 Book Example |
Brown Jr. C (1938) .601 inch spark - Die cast crankcase and back cover - Mounting lug thickness increased to .165" - Straight venturi with regular needle valve at end of venturi and no choke nut - Cadmium plated cylinder - "Brown Junior Motors" logo stamped around cylinder boss on case - Point spring forms large loop below timer - Cadmium plated brass "pot" fuel tank - Ringed piston - Serial numbers stamped on top front of left mounting lug - Serial numbers C12501 thru C15000
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 Needed |
 Book Example |
Brown Jr. C (1939) .601 inch spark - Die cast crankcase and back cover - Mounting lugs .165" thick - Straight venturi with choke nut - All cylinder fins same diameter except top fin which is smaller and lower cylinder fin which is also smaller- "Brown Junior Motors" logo stamped around cylinder boss on case - Ringed piston - Cadmium plated cylinder - Plastic fuel tank replaced brass "pot tank" - Die cast vertical timer with no bump on back of casting - Bypass "tacked" on before final brazing - Serial numbers stamped on top front of left mounting lug - Serial numbers 1C1 thru 20C99
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 S/N 1C67 |
 Book Example |
Brown Jr. C (1941) .601 inch spark - Die cast crankcase and back cover - Mounting lugs .165" thick - Straight venturi with choke nut - All cylinder fins same diameter except top fin which is smaller and lower cylinder fin which is also smaller- "Brown Junior Motors" logo stamped around cylinder boss on case - Ringed piston - Cadmium plated cylinder - Plastic fuel tank replaced brass "pot tank" - Die cast vertical timer with bump on back of casting - Bypass "tacked" on before final brazing - Serial numbers stamped on top side of left mounting lug - Serial numbers 21C00 thru 40C99
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 S/N 21C46 |
 Book Example |
Brown Jr. D (1938) .601 inch spark - Die cast crankcase and back cover - Mounting lug thickness .125" thick - Straight venturi with wire needle valve at end of venturi and no choke nut - "Brown Junior Motors" logo stamped around cylinder boss on case - Point spring forms large loop below timer - Cadmium plated brass "pot" fuel tank - Ringed piston - Serial numbers stamped on top front of left mounting lug - Serial numbers D1 thru D13500 ("D" sometimes after number after #12000)
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 S/N D5547  S/N 12717D  S/N D4292 |
 Book Example |
Brown Jr. D (1939) .601 inch spark - Die cast crankcase and back cover - Mounting lugs .165" thick - Straight venturi, no choke nut - All cylinder fins same diameter except top fin which is smaller and lower cylinder fin which is also smaller- "Brown Junior Motors" logo stamped around cylinder boss on case - Ringed piston - Aluminum rod - Cast iron shaft - Cadmium plated cylinder - Plastic fuel tank replaced brass "pot tank" - Die cast vertical timer with no bump on back of casting - Bypass "tacked" on before final brazing - Serial numbers stamped on top front of left mounting lug - Serial numbers 1D1 thru 79D99
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 S/N 1D27  S/N 38D70  S/N 25D59  S/N 26D64 |
 Book Example |
Brown Jr. D (1942) .601 inch spark - Die cast crankcase and back cover - Mounting lugs .165" thick - Straight venturi, no choke nut - All cylinder fins same diameter except top fin which is smaller and lower cylinder fin which is also smaller- "Brown Junior Motors" logo stamped around cylinder boss on case - Ringed piston - Aluminum rod - Cast iron shaft - Cadmium plated cylinder - Plastic fuel tank replaced brass "pot tank" - Die cast vertical timer with bump on back of casting - Bypass "tacked" on before final brazing - Serial numbers stamped on top side of left mounting lug or on edge of lug - Serial numbers 60D00 thru 99D00
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 S/N 001D9 *
S/N 029D1
S/N 63D76 |
 Book Example |
Brown Jr. M (1938) Standard Brown "B" cylinder layout but with rings - Now has a flywheel - Point cam part of flywheel - Needle valve with choke nut - Serial numbers M1 thru M600 |
 S/N M148 |
 Book Example |
Brown Jr. M (1940) identical to 1939 "C" except has flywheel - uses regular drive washer cam unit - Serial numbers 1M1 thru 1M600 |
 S/N 1M442 |
 Book Example |
Brownie 29 (1940) Die cast aluminum case and lower cylinder unit - Cylinder has double step at top fins - Smooth cast timer - 1/4 32 plug - Serial numbers 1E1 thru 94E99 |
Needed |
 Book Example |
Brownie 29 (1941) Die cast aluminum case and lower cylinder unit - New style brown timer with "bump' on back side - Cylinder has single step at top fin - 1/4 32 plug - Serial numbers E1 thru E--- (10500 total production for both models) |
 S/N E5429 |
"SPECIAL" BROWN JR ENGINES
 S/N B3257R |
John Mohan Engines Both of these Brown engines are from the estate of Jack Mohan. They were originally owned by Jack's older brother John Mohan who was a waist gunner on a B-17 and was killed during WWII. John was several years older than Jack and was an avid modeler before the war. He was from Rosevelt Field, Long island, NY. The 1935 brown B had an "R" stamped on the lug by the factory when the piston was replaced in 1936. This engine was never flown. Both engines were in a display case for 75 years before my purchase of them. |
 S/N 6D428 |
 No S/N |
Reproduction Brown Jr This engine has a ringed piston and a 1939 / 1942 Cylinder - Venturi - Needle Valve arrangement. The timer and crankcase appear to be home made. The cast crankcase has no "Brown Junior Motors" logo stamped around cylinder boss on case and has no serialnumber or other stamping. The backplate is also cast and minimally finished. The fuel bown ring is not a stock appearing item although the cast top portion is marked "Junior Motors." The prop washer is non-stock. |
 No S/N |
 S/N 15265D |
Customized Brown Jr D This engine has a 1938 crankcase SN 15265D (Note: Serial number placement with numbers on front of left lug and "D" on right side between scew holes is consistent with a 1938 engine but serial numbers for 1938 only go to 13500 per references). Cylinder appears to be a replacement with spraybar hole in middle of venturi tube rather than at the end as is found on the 1938 engines. The fuel bowl assembly is a later model plastic tank. The bowl appears to be a repro. The engine is equipped with an accessory exhaust extension and an aftermarket finned head top. |
 S/N 15265D |
 S/N 21C7 |
1941 Brown Jr C with Herb Wahl Parts This engine appears to have been reworked at some time. It appears to have a 1941 C crankcase, however the serial number 21C7 is missing the last number as the series displayed a xxCxx numbering format. The underside of the left mounting lug is engraved (not stamped) with the number 7385. The engine has Herb Wahl parts including Spark Plug, Cylinder, Timer, Spray Bar, and Fuel Bowl Assembly. Also has an accessory exhaust extension. |
 S/N 21C7 |
 S/N 35D83 |
1939 Brown Jr D with Herb Wahl Parts This engine appears to have been reworked at some time possible by Herb himself. The cylinder has been replated. The engine has Herb Wahl parts including Spark Plug, Timer, Spray Bar, and Fuel Bowl Assembly. |
 S/N 35D83 |
 No S/N - Replacement Crankcase |
Replacement Brown Jr This engine has a cast crankcase and backplate with .165" thick mounting lugs and "Brown Junior Motors" logo stamped around cylinder boss on case - No serial number - an "R" is stamped on the front of the left mounting lug as was done when the factory replaced a broken crankcase - The venturi is straight with the spraybar in the middle of the venturi and a choke nut at the end - Equipped with a plastic fuel tank assembly - The cylinder fins same diameter except top and bottom fins which are smaller - Die cast vertical timer with no bump on back of casting - Bypass "tacked" on before final brazing The engine is equipped with a brass, possibly home made, accessory exhaust extension |
 No S/N - Replacement Crankcase |
 S/N 27D28 |
1942 Brown Jr with Custom Exhaust Extension 1942 Brown Jr D with all the correct features for this vintage engine. Serial Number 27D28. The engine is equipped with an aluminum accessory exhaust extension by Scientific and a Blue Crown spark plug. |
 S/N 27D28 |
HERB WAHL ENGINES
 Book Example |
Wahl Brown Jr 40th Anniversary (1975) .601 inch - Completely built from scratch replica of Brown Jr - Combines features from several models - Cadmium plated cylinder with name on bypass - Permold crankcase with matte finish - Plastic tank under venturi - All major parts marked with "Anniversary Brown Jr" engraving - Special "40th Anniversary" spark plug - Hurleman type timer assembly - No choke on venturi - Lapped piston - Serial numbers 1 to 400 |
 S/N 128 |
 Book Example |
Wahl - Brown Jr Classic (1977) .601 inch Variation th the Anniversary Model - 24k gold plating on cylinder, timer, tank, and front prop washer - Choke on venturi - Engine and long metal tank mounted on wooden skid - Parts marked with "Wahl Brown" engraving and stamping - Hurleman spark plug |
 S/N 42  S/N P1 (Prototype 1) |
 Book Example |
Wahl - Brown Jr Custom (1977) .601 inch Cadmium plating on cylinder - Has "Custom" embossed on bypass - Plastic tank under venturi with no markings - Choke on venturi - Hurleman spark plug |
 S/N 120  S/N 168 |
 Book Example |
Wahl - Brown Jr Special (1977) .601 inch Cadmium plating on cylinder - Has "Special" embossed on bypass - Plastic tank under venturi with no markings - No choke on venturi although a very few were released with a chkoe - Bottom two fins on cylinder smaller diameter - Hurleman spark plug optional |
 S/N 34  S/N 87 |
 S/N 161 |
Ohlsson Commemorative (1982/84) .56 inch - Investment mold castings - All parts built new - Designed as a combination of features from all of the Ohlsson Gold Seal models - Step fin cylinder 24k gold plated - Amber colored plastic "Beehive" tank - Enclosed timer - A certification card signed by Irwin ohlsson was placed in each box - Exactly 800 engines built |
 S/N 116 (Bob Edelstein) |
 Book Example |
Wahl Bunch Tiger Mk1 (1986) .454 Inch - Completely built from scratch and styled as a combination of different Bunch models - Investment castings - Brazed and plated cylinder with "WAHL BUNCH TIGER" engraved on bypass - Lapped piston - Exhaust on right - Open Bunch type timer with cam on drive washer - "BUNCH" name on spark plug |
 S/N 44 |
 Book Example |
Wahl Bunch Tiger Mk2 (1986) .454 Inch - Completely built from scratch and styled as a combination of different Bunch models - Investment castings - Brazed and plated cylinder with "WAHL BUNCH TIGER" engraved on bypass - Lapped piston - Exhaust on right - Enclosed "Ohlsson type" timer type timer with cam ground on shaft - Added web on top of shaft housing - "BUNCH" name on spark plug |
 S/N 54 |
Book Example |
Ohlsson Plain Vanilla Gold Seal (1990) .56 Inch - Built with parts from the step finned limited edition "Ohlsson Commemorative" #9 but uses no gold plated parts - Plain steel cylinder - 100 engines built |
Needed |
 S/N T1 |
Ohlsson "Taper Fin" (1991) .56 Inch - Mostly built with parts from the limited edition "Ohlsson Commemorative" #9 but uses no gold plated parts - Plain steel taper finned cylinder - 6 built |
 S/N T1 |
 Box Example |
My Favorite Things (1992) .45 Inch - Composite of many of the engines herb made - Hurleman crankcase - Bunch Tiger type cylinder with exhaust on the right side - Ohlsson Gold seal type amber "beehive" tank assembly - Ohlsson type timer assembly - Nickle played cylinder with large "H" on bypass - "F" in serial numbers - 15 engines made |
 S/N F8 |
Book Example Book Example Book Example |
Herb's "Other" Motors Over the years herb made a number of one off, two off, or three off engines as the mood took him - Sometimes as the result of a "mistake" some engines were built - One example of this is around 5 Bunch engines with the exhaust on the right side - Three examples are pictured here - #15 with square head fins, #16 with gold plated cylinder, and #17 with the exhaust on the opposite side - Most of these were only available at the Toledo R/C show in various years |
Needed |
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