Above are the patent drawing issued for Bill Brown's Engine
The engine Bill constructed in his Dad's workshop for his school design project in 1930
Below: My Recent Ebay Purchase
Equipped with an adjustable choke
Propeller 14 inches;
Speed 6200 R.P.M.
Running my recent Ebay purchase:-
After taking the time to gather the pieces and wire up a power transistor ignition circuit, I was disappointed to discover that the sparkplug was smashed and a full ignition run was out of the question. I did have an old champion glow plug laying around so I installed it and gave the old girl a run anyway just to listen to that long stroke sound.
This summer (2015) I was able to locate another old spark plug and attempt to realize a lifelong quest, by running the Brown Jr. on full ignition.
The video below demonstrates how we made out.
The Brown "B" was produced by Junior Morors Corp in 1934 at Philadelpelphia, PA. and for years this engine captured many flying contests and held manyrecords for model airplanes.
One notable achievement is an award to "Wm. L. Brown Jr., for Gasoline Powered Flight, 2 Hrs. 35 Min., 35-1/5 sec., May 28, 1934." where a Junior powered model was tracked on a cross country flight and returned to the originating point by a full size chase plane. This unbelievable accomplishment captured the attention of the modeling world which assured the success of brand for many years.
Click the Play Button of the object below to view a short video showing the original Model "B" engines being assembled and flown back in 1934 as well as a modern scaled down replica running on full ignition.
The following information is from Collect Air Vintage Model Engines.
This engine is the Brown D, manufactured by Junior Motors from 1938 through 1942. The configuration of this engine, along with the placement of the serial number, 15032 D, shown on top of the lug, suggests that it was built in 1939 which was the peak year for production of the "D" engine (16,600 built) although the "bump" timer arm presumably didn't come out until a year or two later. The "D" is equipped with piston rings.
So now it appears that my new purchase from an EBAY seller is actually a D model and not a B model as advertised.
Latest Old Brown Junior
The internal components of a disassembled engine
Ray's Engine Running Nicely (see comments below)