[SEL] Question about side shaft cam stoppers.

[Judge Tommy Turner]

Curt,
    On the Callahan the governor sits behind the crankshaft and latches 
out the entire shaft.  Its the only engine where the entire shaft 
stops.  There has been models made of the Callahan as  Harry Cooper of 
Alabama borrowed my engine a few years back and did a nice job making a 
1/4 scale model.  Here is a photo, made by Harry Matthews, of my engine 
running at Coolspring about 10 years ago:

http://albums.photo.epson.com/j/ViewPhoto?u=3009203&a=30210971&p=60852791

Tommy Turner


> Some of you may know our local prolific model builder Doug Kelley and 
> have seen some of his exquisite work. His latest model of the Miller 
> engine at Coolsprings (using minerature ignitors!) has been working 
> great for several months, and apparently he is ready to design his 
> next model.
> He called last night asking I dig up information on Callahan engines 
> or other cam stoppers. Perhaps I am recalling incorrectly, but I seem 
> to remember that on a Callahan the shaft continues to rotate, but the 
> governor latches in and out the cam lobes that are on a sleeve on the 
> side shaft.
> But Doug specifically asked about an engine in which the entire side 
> shaft is latched in/out by a governor acting at the back of the shaft 
> near the crankshaft. He wants to build a model that uses a mechanism 
> like this, where the entire shaft rotates and then the entire shaft is 
> latched out.
> So the question is, what engine would this be, and is a detailed 
> explanation available, and are pictures available that Doug can 
> pattern his design from?
> Thanks,
> Curt Holland
> Gastonia, NC
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