This isnt true. This can be seen easily at TDC or BDC. When the crank position is 4* past TDC, the piston has moved 0.005531" down the bore from its position at 0* (TDC). However, at 94* (the same 4* past the 90 position), the piston moves 0.12138" from the 90* position. The piston does not move the same amount for each degree of rotation of the crank.

These calcs were made using a 3.48" stroke, and a TI-83 calculator.

 

I'm saying that the distance between 2 - 5 degrees is the same whether you're traveling at 2000 or 5000 RPM. Yes it is different than the distance between 5 - 8 degrees but my point was that the same goes for 5 - 8 meaning that at ANY RPM the distance traveled between 5-8 or whatever is going to be the same. It's not dependent on RPM.

Edit:
Also in that quote I mentioned time being the same. So in your example while the distances are different the elapsed time is the same. Meaning the latter has a higher velocity.

 

I misunderstood you. You are exactly correct. :hail: :hail:


--Dave

 

ok that guy is just another story but thank you I have reading material at work tomorrow while I listen to people talk about how they want their rewards credit card to give them non-stope flights from manchester to portland oregon. or why do I have to take such a small plane from marthas vinyard. I know they have larger jets out of there. or why is it so much money to fly from white plains to london. I know if I flew out of jfk I could do so for so much less. "well ma'am you could fly out of jfk and save that much money" but I don't want to it's too much hassle and they are so close to each other can't you just give it to me for that price instead?

 

Ahhh!!! I wanted it to stay in obscurity!!! You rotary people!! Harumph!