SoCal Jet Boats

Discussion => The No Wake Zone => Topic started by: jet fever on May 03, 2014, 12:54:35 AM

Title: sum big ole slugs
Post by: jet fever on May 03, 2014, 12:54:35 AM

Check these out.

Title: Re: sum big ole slugs
Post by: rush1 on May 03, 2014, 06:35:51 AM

Locomotive?

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Title: Re: sum big ole slugs
Post by: jet fever on May 03, 2014, 09:20:38 PM

Yep EMD the Generals ole locomotive Diesels

Title: Re: sum big ole slugs
Post by: 74hondo on May 03, 2014, 09:49:30 PM

The EMDs last forever. The GEs have been very poor reliability wise.

Title: Re: sum big ole slugs
Post by: rush1 on May 04, 2014, 06:27:18 AM

How many rpms are those engines governed at ?

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Title: Re: sum big ole slugs
Post by: riverrat4life on May 04, 2014, 09:26:48 AM

Way cool! :)

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Title: Re: sum big ole slugs
Post by: jet fever on May 04, 2014, 05:49:29 PM

Max out at 900 RPM.  Over 4000 HP.

Title: Re: sum big ole slugs
Post by: rush1 on May 04, 2014, 06:10:05 PM

If it's 4000hp I have to imagine the tourqe is gotta be around 6500 ft lb , those things are impressive

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Title: Re: sum big ole slugs
Post by: jet fever on May 04, 2014, 06:52:12 PM

Tell u the truth Im not sure of the Tq number.  I know these EMD cyliners are larger than the GE ones so in turn the GE turns higher RPM. 

Title: Re: sum big ole slugs
Post by: rush1 on May 04, 2014, 08:08:10 PM

If a diesel is turning higher rpms it won't Last

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Title: Re: sum big ole slugs
Post by: 74hondo on May 04, 2014, 08:16:16 PM

The horsepower varys greatly depending on the model. A common GE is an ES44DC which is at 4,400hp. A big jack AC unit like an SD90MAC is at 6,000hp. An older GP series can be as low as 1,500hp for a GP7.

Title: Re: sum big ole slugs
Post by: Flusher on May 04, 2014, 08:29:10 PM

If 4,000 HP and 900 RPM

Then:

TQ = (HP * 5252) / RPM

TQ = (4000 * 5252) / 900

TQ = 21,008,000 / 900

TQ = 23,342lb/ft

I am amazed at how effortlessly and smoothly trains are able to accelerate.

Title: Re: sum big ole slugs
Post by: rush1 on May 04, 2014, 08:35:56 PM

There you go that's the formula we needed. It's pretty amazing isn't it.

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Title: Re: sum big ole slugs
Post by: 74hondo on May 04, 2014, 08:45:55 PM

The rolling resistance is actually quite low. Then once you figure in momentum they don't like to stop. And the beauty of the diesel electric locomotives is the instant and continuos torque.