Nice reply - while we are on cool stuff - like Ferrari's playing Bach.
Your avatar? Is that a Fibonacci spiral? 1+1=2 2+1=3 2+3=5 3+5=8 etc. etc.
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Well, almost. It is what you could call a Golden Spiral, based on the gold number, not on Fibonacci's series. At the "center" they coincide.RH1300S wrote:Nice reply - while we are on cool stuff - like Ferrari's playing Bach.
Your avatar? Is that a Fibonacci spiral? 1+1=2 2+1=3 2+3=5 3+5=8 etc. etc.
we could even compare each others girlfriends without pictures, thus no arguements, just pure arythmetics. im temporarily between relationships(about 18 months ) and i dont think that my ex would appreciate me measuring her face, so why dont you ciro start? 
Did you really rip all her pictures? Now I see why you don't see the diamonds as a good alternative... c'mon, cheer up.pyry wrote:thats cool, now you never need to argue about girls, which one is better looking, all you have to do is measure their faces and come up with a "relative beautyfulity"
beware! it takes you to Golden Ratio Dentistry!). I am sure you can find golden ratios in other parts of the body... suit yourself. Palladio's arquitecture, heck, even the Parthenon is based on the golden ratio, or they say so. 
. A pentagon is composed of golden ratio triangles... I wonder if they shows this in the movie on Da Vinci's code. 
im not sure how small his car is but pipes do workCiro Pabón wrote:Sorry to lengthen this even more, but I found this interesting. I downloaded the software from IWT. I tried small port sizes (2 mm). I found that the smallest chamber length the software gives you is around 650 mm, which is well over half a meter.
To my surprise, the chamber length the software delivers doesn't vary with different port sizes, only with changes in the time the exhaust port opens and the rpm. As this length is probably a function of the properties of the column of air, I would conclude there is no way to use expansion chambers in such small engine as yours, because your model car would seem ridiculous with a pipe bigger than the vehicle. On the other hand, this could be a software limitation, because it is clearly designed for bikes.
I wonder if someone with more experience in small engines can gives us a clue. BTW, every link I found refers you to G.P. Blair book on two stroke engines, that you can buy (with software included) at the SAE site.
To give this some resemblance of a thread, I found that MITRE has developed software to simulate engine noise (another link for me!
You could try to tune your model car engine to, let's say, G major, with a little "pizzicato". Then you could say: hey, this engine rocks! From now on I will think I hear some Bach music every time a Ferrari F1 passes...
come onnmanchild wrote:Noise level = difference between pressure in cylinder when ehxhaust valves open vs athmospheric pressure. That includes speed of opening of valves and diameter and lenght of exhaust as well as frequency/rpm.
if that's true make me a (math & physics) proof!!!
