Model Engine Maker

Help! => Specific Engine Help => Topic started by: AOG on January 20, 2018, 08:23:23 PM

Title: Stuart twin oscillator drawing problems
Post by: AOG on January 20, 2018, 08:23:23 PM

Has anyone made a Stuart twin oscillator recently? I am studying the plans prior to building mine and I have discovered some discrepancies in the dimensioning of the plans. The one that is concerning me is the spacing between the air passages in the standard. The plans call for a spaceing of 9/32 of an inch. The problem is that the ports are on a 15/32 PCD with a 38 degree spacing. By my trig that makes the straight line spaceing at .153 (rounded) between the ports. 9/32 is .281. The holes aren’t going to intercect the passages. Anyone else run into issues getting the ports to connect to the passages ? If not what did you use for the spacing between the air passages?

Thanks

Tony

Title: Re: Stuart twin oscillator drawing problems
Post by: Jasonb on January 20, 2018, 08:37:15 PM

Put up a picture of that part of the plan then those who have not made it could see if there is an error or not

Title: Re: Stuart twin oscillator drawing problems
Post by: Jasonb on January 20, 2018, 08:49:21 PM

Don't worry I found the drawings on the net.

The two sets of holes will connect as can be seen on this quick sketch I did. They do not come directly in line with each other but there is sufficent overlap to allow air/steam to flow. The Oscillator I did over xmas is similar.

Title: Re: Stuart twin oscillator drawing problems
Post by: AOG on January 20, 2018, 08:49:59 PM

Here is the section of the print in question.

(https://uploads.tapatalk-cdn.com/20180120/26fc1d0475b769c01f049adbf3ae7d2d.jpg)

Tony


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