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If it is the model aero engine I found a short video clip off - it isn't really a valve less design - just a rotary valve => nothing new.Or is it something different that we haven't seen yet ?
Can't really see but it looks similar to the 'Cross Rotary Valve' .https://www.bing.com/images/search?q=cross%20rotary%20valve&qs=n&form=QBIRMH&sp=-1&pq=cross%20rotary%20valve&sc=1-18&sk=&cvid=E41476CEA8704E6EA53793089C609D4AThere have been models made with this arrangement I'm pretty sure. ( Pascoe ?? )The (one of ) other design (s) is the 'Aspin Valve'A description of these are in that book I gave you Jo. 'Valve Mechanisms for High Speed Engines' Back now to sulking .. Still no proper bacon in the shop I'm not thriving. Damn sure I'm running short of some essential micro nutrients Dave
Those oring just prevent leakage to the outside, mainly leakage to the intake. The seal in question is simply a very small clearance between the rotary valve and head. In production engines this is achieved with silicon aluminum head and chromed valve of brass/bronze. The expansion rates of these material allows a small clearance over a wide range of temperatures. Rotary valves need to be quite large to compete with poppet valves in terms of power.The Aspin valve is a very specific design. The only model engine to use it was the Webra T4-.91 The other Webra T-4 (40, 60, 80) used the Cross type. HP VT series are not Aspin, but are a rotary type.
>So far, im not impressed with the quality of the plan, but it will be ok.I have his 5 & 9 cylinder radial plans (because you need both in order to build the 5 which is a bit PITA). I redrew them in SW because I work in inches & check for any discrepancies & develop jigs & fixtures around the parts. Although there were only a few minor errors, most of the time was spent trying to figure things out. Just a few key expanded views or detailed cross section would have gone a long ways to helped clarify certain things. Also note euro-projection standard might be different than what you are used to. I'm certain the engine was designed in 3D so some questionable dimensions might be more of a result of which he elected to display on the drawings themselves. I'm sure you will figure it out. I have emailed him questions & received occasional replies. To be fair, compared to some of the older generation plans where errors were lurking for years until people a) found them b) documented them, I still feel these CAD plans are good value considering all the work that goes into them.
I realized that my comments sounded negative, and I'm sorry if they came around that way, as I really hope that you will enjoy the experience - even if it (maybe) gives you some challenges along the way Best wishesPer