Krusty: I wrote this before Tom posted the link above. I agree with you that current adds seem to minimize the claim.
My post was not about disparaging anyone. In fact, Wayne is a wonderful supporter of LSR, a highly esteemed competitor, and an astute businessman. He is a great guy and has even helped me with some tech questions while waiting in line at the Red Flame. I assumed that this thread might reach him.
As mentioned in the link, sometimes a supposition can be mentioned so many times in literature over the years that it becomes an assumed fact. The harmonic dampening phenomena has been mentioned so many times in magazine articles and adds it isn’t even disputed. Perhaps, since you are not an engine builder, the phenomena is not a focus for you or even an important issue to discuss. There are some wonderful claims about durability, changeability, precision, that appear to be reasonable. I thought the link might be interesting for those constantly filtering the noise around us and seeking a balanced opinion. Reference, throughout the years are too many to list. Magazines seem to just rubber stamp the issue. But for your viewing pleasure here are two current links from the manufacturers.
From Jesel:
http://jesel.com/index.php?categoryid=9Patented High Torq Drive™ reinforced belt operates dry and spins with less friction than timing chains or gear drives and also
absorbs harmonics.
From Comp Cams:
http://www.compperformancegroupstores.com/store/merchant.mvc?Screen=PROD&Store_Code=CC&Product_Code=6100B&Category_Code=TMNGBLTAbsorb crankshaft harmonics to guard against valve train instabilityI agree with you that aircraft and cars are two completely different environments. And your point is important in that issues from one environment can’t be assume in a different environment. But the point was simpler than that. We are talking about coupling two inertias together with a belt. Of course, mass and stiffness will vary all over the place. And the extent that a belt couples or decouples unwanted harmonics is interesting. There are a lot of claims but no quantitative data.