Eduardo wrote: I think in armonic vibrations. What hapens if you put on it a PSRU? ----------- I have been discussing the ongoing questions of Direct Drive and the changes of a damaged crank. This is what I got from VW Engines,
Now people might realize that the reality of direct drive engines is the probability of breaking a crank is high. Our gear drive engines are not subjected to: 1 The concertina effect of thrust on one end and the thrust bearing on the other. 2 Direct prop forces acting against the crankshaft placing very high loads which the crank was never designed for. 3 Cushioning devise minimising or eliminating harmonics back to the crankshaft. 4 The result of gearing allows the engine to produce optimum hp at a normal operation rpm range and produce efficient propeller rpm. The crankshaft is subjected to normal conditions that the engine was designed for in the first place. I am talking gear drive not belt drive because this also places a high belt tension load in one direction and even an out rigger bearing is not the complete solution in this case either. Ron Slender VW Engine Centre Phil Matheson mathe...@dodo.com.au VH-PKR ( reserved) 61 3 58833588 See our VW Engines and Home built web page at http://www.vw-engines.com/ www.homebuilt-aviation.com/
