45 replies to this topic

[liftmech]

Exactly my point.

[lastchair_44]

We usually run Quincy at 1000, maybe a little faster...it depends on the guy who starts it in the morning.

[Dr Frankenstein]

NOTE:

In the SAM and many other places, the speeds in FPM are rounded (I think it's the right term).

so:

1000 fpm ≠ 5.08 m/s
1000 fpm = exactly 5 m/s.

I don't know why.

[SkiBachelor]

Actually, 1000 fpm does equal 5.08 m/s while 5 m/s equals something like 948 fpm.

[Dr Frankenstein]

The speeds in FPM are... I don't know how to say it in english.. uh... estimated, I mean that if a number was near to 1000, like 948, they simplified it to 1000, maybe to simplifiate the calculations, or a thing like that. The official speed for a detachable is 5 m/s, not 5.08.

[SkiBachelor]

No, I thought so too until put 1000 fpm into meters per second. If you divide 1000 by 60 and put it into feet per second, then you use a conversion calculator to go from feet to meters and it will give you 5.08.

[floridaskier]

How fast is 1100 fpm in m/s? Whats the formula to figure t out?

[liftmech]

1100 FPM= 6.054 m/s.
1100/60 to get feet per second, then divide again by 3.28084 (the feet-metres magic number) to get metres per second.
To go from m/s to fpm, run the formula backwards- m/s x 3.28084, then x 60= fpm

[Eric]

They will run lifts slower if it's really windy. Why?

I think they run hsq's at full speed during busy days

[Allan]

Dr Frankenstein, on Mar 18 2004, 06:20 PM, said:

The speeds in FPM are... I don't know how to say it in english.. uh... estimated, I mean that if a number was near to 1000, like 948, they simplified it to 1000, maybe to simplifiate the calculations, or a thing like that. The official speed for a detachable is 5 m/s, not 5.08.

We don't estimate our FPM speeds... Red runs at 504 fpm and 2.56m/s. T-bar 590 which is 3.0m/s.

[KZ]

Lifts run slower when its windy becasue the wind will move the chair around. Heavier chairs (6,8) have better wind stability becasue they are heavier, so the wind cant blow them around so easily.

Lifts are usually run full speeds on crowded days so that lift lines are shorter becasue the chair running full speed has a higher capicity than a slower running chair.

[Dr Frankenstein]

Allan, on Mar 19 2004, 09:42 PM, said:

Dr Frankenstein, on Mar 18 2004, 06:20 PM, said:

The speeds in FPM are... I don't know how to say it in english.. uh... estimated, I mean that if a number was near to 1000, like 948, they simplified it to 1000, maybe to simplifiate the calculations, or a thing like that. The official speed for a detachable is 5 m/s, not 5.08.

We don't estimate our FPM speeds... Red runs at 504 fpm and 2.56m/s. T-bar 590 which is 3.0m/s.

I mean in the SAM and many other books. In the last lift survey, vou can see that the Orford chondola runs at 1000 FPM, so 5.08 m/s. The real speed of this lift is 948 FPM, exactly 5.00 m/s.

[SkiBachelor]

Dr Franenstein, this is from the SAM survey in the magazine.

http://www.skilifts....tall_na2003.htm

[ccslider]

Dr Frankenstein, on Mar 21 2004, 05:29 PM, said:

Allan, on Mar 19 2004, 09:42 PM, said:

Dr Frankenstein, on Mar 18 2004, 06:20 PM, said:

The speeds in FPM are... I don't know how to say it in english.. uh... estimated, I mean that if a number was near to 1000, like 948, they simplified it to 1000, maybe to simplifiate the calculations, or a thing like that. The official speed for a detachable is 5 m/s, not 5.08.

We don't estimate our FPM speeds... Red runs at 504 fpm and 2.56m/s. T-bar 590 which is 3.0m/s.

I mean in the SAM and many other books. In the last lift survey, vou can see that the Orford chondola runs at 1000 FPM, so 5.08 m/s. The real speed of this lift is 948 FPM, exactly 5.00 m/s.

So all of these speeds assume that the speed meter is calibrated correctly. Do any of you check the calibration of the meters?

[liftmech]

Yes, using a good old stopwatch and timing the chairs as they go by. So far I've only had to recalibrate a magnet-based induction meter ('96 Riblet)- the glue used to hold the magnets in failed and we found them scattered about the motor room stuck to everything.

[Allan]

We have a hand held tachometer that we run on the haul rope, which tells us the fpm or m/m... which is calibrated.

[Dr Frankenstein]

??? The speeds in these books are just estimated. It's what I think.

This post has been edited by Dr Frankenstein: 22 March 2004 - 06:19 PM

[edmontonguy]

The speeds are the design speeds of the chairs. depending on a number of factors the lift speed will and can change. Unless you have a speedometer on the bull wheel it is difficult to gauge an exact value.

[Allan]

There is a tachometer on the end of the electric motor that gives the speed reference to the drive controls & the meter.

[SkiBachelor]

Kind of going of the subject that we are now talking about, but you know how the ANSI B77 code won't allow high-speed quads and six-packs can't run faster than 1100 feet per minute, but could the Yellowstone Club run its high-speed quads at 1200 or faster if they wanted since it's a private resort?