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# Electrical Engineering/Concentric Giant Wheel Design

Question

Concentric Circles

Giant Wheel
QUESTION: Dear Cleggsan

http://en.wikipedia.org/wiki/Giant_Wheel
http://en.wikipedia.org/wiki/Ferris_wheel
http://www.giantwheels.info/

http://en.wikipedia.org/wiki/Concentric

Concentric objects share the same center, axis or origin. Circles, tubes, cylindrical shafts, disks, and spheres may be concentric to one another.

Is it possible to construct or manufacture Concentric Giant Wheels ?

Example
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http://www.chancerides.com/rides/images/gi...l_specsheet.pdf

Pros : More Sitting Capacity for Riders on the Concentric Giant Wheel as riders can also sit on the chairs of the inner circles of the Concentric Giant Wheel.

Cons : Engineering Challenges for Construction, Additional Cost.

Can there can be complexities for constructing a Concentric Giant Wheel ?

Thanks & Regards,
Prashant S Akerkar

ANSWER: I suppose you could construct such a Ferris Wheel.  Cost and design may be very difficult and expensive.

QUESTION: How would you embark and disembark passengers in the inner most concentric seating spaces?  Would the customers be willing to pay the same fee when the view and seating may be obstructed and made less enjoyable?

Best wishes.

---------- FOLLOW-UP ----------

QUESTION: Dear Cleggsan

http://www.chancerides.com/rides/images/giant_wheel_specsheet.pdf

POWER REQUIREMENTS*
Total .> 130 kW
Min./Max. voltage .> 208/230 - 460/480 volt,3 phase, 60 Hz

DRIVE*
Type .> variable speed electric variable speed electric
Motor Type .> 230/460 volt, 3 phase, 60 Hz
Number of motors.> 8
Horsepower rating .> 7.5

Query
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Since there will be Concentric circles, there will be more capacity for riders to ride on the Giant wheel, this will increase the Load on the Wheel. In this case do you feel that the Number of Drives (Motors) and Electrical Power requirements to drive the Giant Wheel may have to be increased ?.

Thanks & Regards,
Prashant S Akerkar

I am no expert in the design and engineering of these types of big wheels.  However, from a basic engineering point of view, whenever the load is increased the input power must also be increased since more 'work' must be done.  Either the number of driver motors or the horsepower ratings of the motors must be increased to keep up with the load demand.

The size of the increase is an engineering matter that must be determined by careful examination of the increase in the load.  For example, if the load were to be doubled in the number of seats and the weight of the structure then it is logical that the amount of horsepower of the motors would need to double - or even more to overcome startup inertia......

Something to think about for sure.

Electrical Engineering

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#### cleggsan

##### Expertise

All technical areas of Electronics Engineering.

##### Experience

BSEE, MBA, Design, R&D, University Research.
Senior Life Member of IEEE. Life Fellow of AES.

Organizations
IEEE, Consumer Electronics Society, Audio Engineering Society.
Broad teaching experience; work experience mostly in consumer electronics and conversion from analog to digital technologies. Pioneer in digital audio at all levels.

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BSEE (Equiv) BYU BSEE University of North Dakota MSBA (MBA) Illinois State University Graduate Studies in Computer Science - Bradley University Graduate Studies - Ohio University Graduate Studies - University of Missouri Kansas City DeVry Tech - Electronics