Thanks Karl,
I was pretty sure the 100 ton Coal Hoppers the 'Q' received in the mid
60's had the 36" wheels and I put them on the first Walthers Quad Hopper I
built but just wanted a second opinion before I finish the fleet!
John Olson
Jim's Junction
Billings, Mt.
----------
>From: "Karl L Rethwisch" <karlre@r...>
>To: <BRHSlist@egroups.com>
>Subject: Re: [BRHSlist] Wheel size on Hoppers
>Date: Sun, Oct 29, 2000, 9:44 AM
>
> It became standard for high capacity cars, such as grain and coal, to be
> equipped with 36" wheels. The 36" has given way to 38" in recent times.
> The larger wheel was seen as a "fix" to the shelling problem which
> currently represents the single biggest cost of car repair.
>
> When one considers the work that a wheel must do it is easy to understand
> the high cost of doing business. Besides "merely" supporting the weight of
> the car it must guide the car and, at the same time, absorb the mechanical
> shocks associated with operation over tracks of widely varying quality.
> Vertical and lateral moments create high levels of energy transfer within
> the wheel. So much for support and guidance. Also listed among the duties
> of a wheel is the one related to STOPPING the vehicle. As much as 40
> horsepower worth of braking energy may be applied to each wheel on a car.
> The by-product of this energy is, of course, heat, LOTS of heat. The
> greater the "length" of the wheel tread (increased wheel diameter) the more
> area is provided for dissipating the braking heat which is generated every
> time the automatic air brakes are used by the Engineer.
>
> Also of potential interest to "wheel fans" is the CURVED PLATE wheel design
> introduced many years ago. The "PLATE" is that part of the wheel extending
> from the hub to the tread. In early designs it was "straight" and resisted
> lateral deflection. This resistance resulted in a substantial number of
> plate failures which lead directly to complete wheel failures. I believe
> we all understand the ramifications of a wheel failure. The "CURVED PLATE"
> allows a certain degree of flexibility during high stress moments of the
> wheel in both lateral and perpendicular (to the axle) planes and, thereby,
> drastically reduces plate failures. Use 36" wheels under all of
> your high cap. bulk commodity cars.
>
> Does this help John?
>
> Karl
>
----------------------------------------------------------------------------
---------
>
----------------------------------------------------------------------------
---------
>
> ----- Original Message -----
> From: JOHN J. OLSON & DEBBIE NIESS
> To: BRHS
> Sent: Sunday, October 29, 2000 8:44 AM
> Subject: [BRHSlist] Wheel size on Hoppers
>
>
> BRHS Members,
> I have a stupid question that I have been trying to find an answer for.
> Did the CB&Q 100 Ton Quad Hoppers, like the ones Walthers made in a single &
> 6 pack, ride on 36" wheels or 33". I have looked at photos in the Morning
> Sun Color Guide to Frt & Pass Equip and can't tell for sure although they
> look like 36". I know 36" wheels are the rule for most 100 Ton coal and
> grain cars but was that the rule back in the 60's as well? I just want to be
> sure. The 'Burlington Bulletin' on Hoppers doesn't say- or I just overlooked
> it. Thanks,
> John Olson
> Jim's Junction
> Billings, Mt.
> <http://www.jimsjunction.com>
>
> eGroups Sponsor
>
>
>
>
> [Non-text portions of this message have been removed]
>
>
>
>
>
|