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Flywheel Rotation


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  #1  
Old 06-29-2019, 04:12:44 AM
Winchester Winchester is offline
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Default Flywheel Rotation

Yes well the question has arisen regarding the direction of rotation of large flywheels with curved spokes . I am of the opinion that the direction of rotation is that 'that puts the spoke in compression.............others may disagree.
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Old 06-29-2019, 04:47:47 AM
isandian isandian is offline
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Default Re: Flywheel Rotation

I have an engine with one facing one way, the other the other way - an each way bet! My guess is one might have been damaged and the only available replacement was identical to the intact one, so it had to go on backwards. I tried to rectify it but was beaten by a tapered keyway when the flywheel was turned around. At just 300rpm rated speed, it is not under a lot of stress.
Otherwise, I agree with your suggestion.
Ian
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Old 06-29-2019, 05:55:09 AM
Paul Richardson Paul Richardson is offline
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Default Re: Flywheel Rotation

Richard Hornsby & Sons was one maker that appeared to be happy to drive the same or very similar flywheel in opposite directions?Here are two of their new machines pictured having the same or very similar curved spoke flywheel fitted.Each engine according to the little booklet is designed to run in the opposite rotation to the other.
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Old 06-29-2019, 02:46:38 PM
Andrew Mackey Andrew Mackey is offline
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Default Re: Flywheel Rotation

Only one casting needed for flywheels, and only machining was different. Kept costs down Most of the steam engines i own with curved flywheels, have the spokes under compression on the power stroke. My grandfather and i used a metal detecter to find a busted uup large steam engine, burried in his back yard. We found the flywheel and a bent crank burried together. The flywheel had been mounted 'reversed' on the crank, and when whatever bent the crank did, all the spokes sheared. They all broke in the same manner. Sure would have liked to find the rest of the engine, but only found some brass valve links and a lot of busted iron
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Old 06-29-2019, 10:02:21 PM
Inter Bloke Inter Bloke is offline
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Default Re: Flywheel Rotation

I remember this question coming up somewhere before and someone said (not me I don't know the answer firsthand) that it didn't matter which way the flywheel spokes went from an operational point of view because they were only made curved to alleviate stresses from the casting process. Straight spokes were more prone to cracking as the casting cooled and shrank. This is why most of the very early Wolseley and Lister overhead shearing plants with the early straight spokes on the friction wheels were destroyed intentionally by shearers because they were prone to cracking and spraying cast iron over the board which the later replacement curved spoke design that was supplied as a spare part stopped. Didn't endear them to the farmer/station owner but it did happen.
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Old 06-30-2019, 02:24:25 AM
cobbadog cobbadog is offline
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Default Re: Flywheel Rotation

Hi Ian,
Is it possible that one of the flywheels was fitted on back to front?
This would make the spokes face the same way then, unless I'm missing something.
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Old 06-30-2019, 04:21:11 AM
Kerry Morris Kerry Morris is offline
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Default Re: Flywheel Rotation

As Paul said, R Hornsby ran their portable engines with the flywheel direction opposite to the normal and to that on their stationary engines. so I for one do not support the must be in direction of compression, I think it was for decorative, the question has been asked for years with no real answer
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Old 06-30-2019, 05:42:13 AM
typak typak is offline
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Default Re: Flywheel Rotation

This subject was covered before on another thread?, anyhow in the short, curved arm/spoke wheels alleviate the stresses caused by the cooling contraction in the casting process, it can also be observed in many instances straight arm/spoke wheels that are stress relieved by having the nave/hub single or double slotted with stay bolts then fitted, many larger flywheels being built in sections for this reason and also ease of transport, as for direction of rotation that seems not a issue? as it can be said there are any number of reversible steamers and even combustion engines out there with curved arm wheels that have passed the test of time?

Last edited by typak; 06-30-2019 at 08:29:24 AM.
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Old 07-06-2019, 11:44:03 PM
macdonald macdonald is offline
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Default Re: Flywheel Rotation

hi all my meadowbank spins in what people call backwards thanks macdonald
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Old 07-07-2019, 04:19:40 AM
Scotty 2 Scotty 2 is offline
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Default Re: Flywheel Rotation

Quote:
Originally Posted by Winchester View Post
I am of the opinion that the direction of rotation is that 'that puts the spoke in compression.
Hello all
Which bit of the curved spoke? If one side (leading edge) is in compression, isn't the other side (trailing edge) of the spoke in tension and vise versa?
I think I'd be thinking the correct rotation direction would what the maker said it's supposed to be.

Cheers Scott
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Old 07-07-2019, 07:26:15 AM
cobbadog cobbadog is offline
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Default Re: Flywheel Rotation

If the curved spoke flywheels have a parallel hub with a single keyway then that flywheel can be swapped around to have the curves face the opposite way, so which way do you put them on?
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Old 07-10-2019, 09:02:29 AM
Foseng Foseng is offline
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Default Re: Flywheel Rotation

Just found this an a book I am looking at titled Gas-Engines and Producer-Gas Plants by R.E. Mathot published in 1905.

Dave
Laoag City, Philippines.

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Old 07-10-2019, 12:43:30 PM
Bill Hazzard Bill Hazzard is offline
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Default Re: Flywheel Rotation

Like the book says, the spokes will be in compression on the power stroke, but on the other 3 strokes the spokes would be in tension as the flywheel keeps the crankshaft moving and delivering torque to the load. Also if a sudden load comes on, the spokes will be under a lot of tension so it doesn't really matter which way the spokes run from a mechanical standpoint as long as they are heavy enough for the loads. Run the spokes which ever way that you think looks nice and you will be fine.
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Old 07-10-2019, 06:25:39 PM
Scotty 2 Scotty 2 is offline
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Default Re: Flywheel Rotation

Quote:
Originally Posted by Bill Hazzard View Post
Like the book says, the spokes will be in compression on the power stroke, but on the other 3 strokes the spokes would be in tension
Like Newton's 3rd law says huh?
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