Fly wheel kg increase

[JET]

Can some one help me find out what kg / power increase an 80kg flywheel will do if ran @540rpm

Fly wheel
80kg
500mm diameter
Running at 540rpm

thank you

 

[Lincs Lass]

80 kg would be about the same weight as a flywheel on a convectional bailer running at 540,,
What do you mean by power increase.

 

[JET]

Got a customer running a 70hp tractor on a logging machine but wanting the machine to preform better (the wood he is processing is seasoned so hard to cut)

fly wheels are an optional extra to increase momentum


I was wondering what an 80kg fly wheel would bring to the table

 

[Wisconsonian]

That makes more sense, because power won't be increased by a flywheel in the technical sense. The basic math escapes me for calculating this, and I suspect that the basic math would be wrong, this would take some serious math to figure the feel of the power increase you'd get from a flywheel.

I'm going to guess it will feel like about 20 more HP, that's judging from small square balers on small tractors, buzz saws, and making it up. I'm assuming this logging machine is a circular saw crosscutting logs? has he tried sharpening the teeth, maybe changing the teeth to fit the wood?

 

[JET]

No it basically pinches the logs
But the branches are dry with knots in them and once the knife hits the knot it shears the shear bolt

a bigger shear bolt can be fitted but i suspect damage to the tractor would result

Here is a video

fly wheel bolts on where the yellow cap is

 

[john432]

Don't think any amount of flywheels is going to make those machines cope with dried out British hardwoods. The working videos allways seem to be in the Baltic countries, processing the same kind of timber, probably as soft as poplar. Like to see it on dried white thorn, or golden chain.

 

[JET]

No the diameter should be reduced if its dry for obvious reasons

machine is cutting it fine untill it finds a knot which is a bit harder

Fresh cut wood is a hell of a lot less hassle

 

[Lincs Lass]

If the machine was designed to use an 80kg flywheel ,,it would have been built with it ,,its been built with a 70kg for a specific reason ,,if your customer is trying to make the machine work harder ,they should have bought one bigger to start with.
Altering the machines capabilities from its factory design will probably invalidate any warranties unless its out of warranty

 

[JET]

No the machine is built to take a fly wheel but most customers dont want the optional extra as its a bit more money

Its not a retro fit

i was just curious what extra punch it would carry

 

[mo!]

Flywheel Energy Calculator

This gives you an idea of the energy stored in the flywheel. That energy will be released pretty much immediately I would think. I would imagine it will make quite a difference.

I've seen a few videos of these types of machine and they look great for dealing with long thin material and brash. There always seems to be half the logs on the floor though? Are they just running it too fast?

 

[Wisconsonian]

I think they knew what they were doing by designing it with the flywheel, and it will help. Don't ask me how, but the flywheel will transmit the power that the tractor will not, smoother possibly.

No way I'd guess the difference in apparent power for the shear bolt protection.

Is this shear bolt on the tractor side of the flywheel , or between the flywheel and the cutter? BIG difference.

 

[JET]

What do you make of this

 

[JET]

I think they knew what they were doing by designing it with the flywheel, and it will help. Don't ask me how, but the flywheel will transmit the power that the tractor will not, smoother possibly.

No way I'd guess the difference in apparent power for the shear bolt protection.

Is this shear bolt on the tractor side of the flywheel , or between the flywheel and the cutter? BIG difference.

Its on the pto shaft

 

[Dave W]

80kg is bugger all weight. A tractor weight is 49kg so visualise 2 together. Conventional baler flywheel will e nearer 300kg

 

[JET]

80kg is bugger all weight. A tractor weight is 49kg so visualise 2 together. Conventional baler flywheel will e nearer 300kg

Thats the biggest one they do

 

[Wisconsonian]

I was assuming the flywheel would break the shear bolt, in which case it would still cut better, but much harder to figure why.

With the shear bolt protecting the PTO shaft, I'll guess it will cut twice as tough a log with the flywheel without breaking the PTO shear bolt. A slip clutch on the PTO and a flywheel would make it much nicer to operate.

 

[Netherfield]

It can't give any extra power, it's designed to smooth out the rotational forces.

 

[Highland Mule]

No it basically pinches the logs
But the branches are dry with knots in them and once the knife hits the knot it shears the shear bolt

a bigger shear bolt can be fitted but i suspect damage to the tractor would result

Here is a video

fly wheel bolts on where the yellow cap is

That looks seriously efficient for cutting through thin trees - imagine it would beast the thin birches we have here. What sort of ££ does it cost?

 

[mo!]

It can't give any extra power, it's designed to smooth out the rotational forces.

Beg to differ. A flywheel stores energy. That energy can be discharged over time, which is power. So the flywheel works with the engine to give a momentary increase of power which you would experience as a smoother delivery of power. As the load decreases (after the log goes through) the flywheel is then charged up again.

If you want a better example of a flywheel giving power then look at the CURS in F1.

 

[Pennine Ploughing]

Kinetic energy is stored in a flywheel and released when needed,
Now let's say the machine is rated @70 hp, and it has positive and negative loads fluctuations, a flywheel will smooth it out,
Fittings a flywheel will not give it any more power at all,
However in the machine above, needing a big fendit to drive it,
Fitting a flywheel will give momentum and Kinetic energy, so a 40 hp tractor would be able to do the same job.



On the other hand, weld up the shear bolts thingymajig and stick 100 hp on it if you want more power

Edit, a baler shear bolt is after the flywheel in the drive line