Re: NNG - Oh Boy!! More Heisler Pics!!!
| April 17, 2015 01:30PM |
Earl Wrote:
=======================================================
> I just ran the numbers in the following formula:
>
> BP x .75 X CS X (CB x C
x GR / DD
>
> BP= boiler pressure
> CS= piston stroke
> CB= cylinder bore
> GR= gear ratio
> DD= driver diameter
>
> like so:
>
> 200 X .75 X 16 X (18.25 X 18.25) x 2 / 40 =
> 39,967 lbs. TE
>
> Which is optimistic but close to the 38,800 that
> is in Cass literature.
>
> If you use the more standard boiler loss factor of
> .85 instead of .75, the TE goes to 45,297, still
> less than the claimed 49k+.
>
> Smoke and Mirrors...
>
> If a 90 ton Heisler had 2.18:1 gearing and used
> 85% mean boiler pressure, you'd get 49,410 lbs TE.
Thank Earl, this is just what I was hoping to see. If you look
at later Heisler class stats, you'll see that they were using both
the 75% and also the 85% figures for t.e. Makes me wonder now if
this one then got the taller gearing at the factory account of having
no ready customer handy? Was that the case?
Looking forward to seeing you next month. I plan to spend Wednesday
night in Beckley, WV and then drive up Thursday morning.
=======================================================
> I just ran the numbers in the following formula:
>
> BP x .75 X CS X (CB x C
x GR / DD>
> BP= boiler pressure
> CS= piston stroke
> CB= cylinder bore
> GR= gear ratio
> DD= driver diameter
>
> like so:
>
> 200 X .75 X 16 X (18.25 X 18.25) x 2 / 40 =
> 39,967 lbs. TE
>
> Which is optimistic but close to the 38,800 that
> is in Cass literature.
>
> If you use the more standard boiler loss factor of
> .85 instead of .75, the TE goes to 45,297, still
> less than the claimed 49k+.
>
> Smoke and Mirrors...
>
> If a 90 ton Heisler had 2.18:1 gearing and used
> 85% mean boiler pressure, you'd get 49,410 lbs TE.
Thank Earl, this is just what I was hoping to see. If you look
at later Heisler class stats, you'll see that they were using both
the 75% and also the 85% figures for t.e. Makes me wonder now if
this one then got the taller gearing at the factory account of having
no ready customer handy? Was that the case?
Looking forward to seeing you next month. I plan to spend Wednesday
night in Beckley, WV and then drive up Thursday morning.
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488 stops for water at Los Pinos tank on closing day Oct. 1979. Photo courtesy Don Richter
The NGDF was started by Don Richter and is currently operated in his memory by Nathan Holmes and others. Others who have contributed to the upkeep of this board are (in no particular order): Charles McCandless, Everett Lueck, Ted Wilton, Cole Adams, James Bane, John Moellmer, Jon Bentz, Linn Moedinger, lloyd lehrer, Rod Jensen, John Craft, Steven Forney, Herb Kelsey, Bill Ramaley, Russ Sperry (El Russo Loco), Josh McNeal, John West, Jim Armstrong, Bob Bergstrom, Greg Scholl, Blake Forbes Doug van Veelen and Mark Fuller.