|
|
| Re: R1/9 acceleration (Re: What is the mechanical condition of the Low V?) (663988) | |||
 |
|||
| Home > SubChat | |||
|
[ Read Responses | Post a New Response | Return to the Index ] |
|
||
|
Re: R1/9 acceleration (Re: What is the mechanical condition of the Low V?) |
|
|
Posted by JournalSquare-K-Car on Sat Aug 9 20:45:43 2008, in response to R1/9 acceleration (Re: What is the mechanical condition of the Low V?), posted by SelkirkTMO on Fri Aug 8 02:00:57 2008. You brought up that 3.5....heck, NOT EVEN LRVs accelerate that fast. Yet PCCs from almost 70 years ago did BETTER. BUT, like i have said before, an arnine did 1.75 with one truck...if it had two trucks powered, then it could easily have 3.5 MPH/s acceleration. From what i read though, SMEEs have about the same amount of horsepower as R9 cars, but since the SMEEs distribute it over all the wheels, they can take more advantage of it....plus dynamic brakes on all wheels...not like the IRT NTTs which don't have dynamic brakes on all trucks.Though that must have been a design consideration for SMEEs. They had all powered trucks, so all trucks had dynamic braks...more motors to maintain, but maybe the make it up in the savings of brake shoes? But what effect do dynamics have on resistor grids? Maybe they tend to butn them out faster? I wonder if dynamic brakes are even practical...regenerative..YES, but just for stopping poer, maybe EDDY brakes are better, they release the heat through the wheels like regular brakes do. Some Multis had Eddy brakes...and they don't mess up resistor grids i bet, and since Eddy brakes are simpler(i think) than dynamic brakes..less electronics, like relays, to take care of, and you could have them on unpowered trucks...just some thoughts. |
|
|
|