Patent: Toy Engine Starting Device [Wen-Mac] (RCL#1281)

Patent: Toy Engine Starting Device [Wen-Mac] - cover thumbnail

"A feature of the invention is that there is practically no possibility of the pull cord becoming entangled with the propeller. The pull cord is moving toward retracted position as the engine shaft is rotated to accomplish a starting of the engine, and at the same time rotation of the propeller produces an air flow which acts to carry the projecting end of the pull cord away from the propeller."

About this Title

Patent: Toy Engine Starting Device [Wen-Mac]
US No. 2,946,327
John W. McRoskey
July  1960
Patent, 6 pages

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About this title

Application for patent filed May 8 1957; patent granted July 26 1960.

"It is an object of the invention to provide a toy starting device for toy engines, this starting device having a projecting pull cord, wherein breakage of the pull cord is avoided, thereby practically eliminating loss of service of the toy engine during time the replacement of the pull cord is being made, and practically avoiding the necessity of replacing the pull cord of the toy starter mechanism."

John (Jack) McRoskey transferred ownership of this patent to the Wen-Mac Corporation - the model manufacturing company set up by Jack and his brother Len. (Adolph Wenland was also an early partner in the business, hence the name 'Wen-Mac'.) Wen-Mac was one of Cox Engines' many competitors in the field of .049 cu. in. engines and ready to fly plastic .049 control line planes. There's an interesting 'American Modeler' Sept/ Oct 1964 article about the company archived at

Direct submission to RCLibrary.


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Download file details:

Patent: Toy Engine Starting Device [Wen-Mac]
Submission date: 22/03/2016
A backup copy has been saved as:
TitleID: 1281 | Filesize: 758KB
Credit*: Pit
Format: PDF
For available downloads held on the RCLibrary server, see the download page

User comments:

Believe it or not, I had one of these, but it wasn't in an airplane but in a kind of helicopter. At that time, early sixties, the U.S. Army was developing a "Flying Platform" with an enclosed prop mounted below the standing pilot who would fly the thing. The WenMac engine had a throttle control in the handle, connected to a rigid wire about six feet long. Throttle control allowed the model to rise, while forward and back was accomplished by tilting the handle. No it didn't work very well, that's probably why I received the model from Scarborough Drug Company, who had a model dept. The pull starter was the only way the engine could be started, buried in the depths of the strange-looking model. I had several of the WenMac engines back in the day, can't say they were ever any competition to the much nicer Cox models. Yes, they would run if you could ever get them started. Most of the WenMacs were installed in plastic models, that's where mine originated, available real cheap a few days after Christmas. I think 50 cents was the going price......
DougSmith - 22/03/2016
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