Fallon
Super Member
Haha, thought the same exact thing before I even saw your post. Seen a few of those clips over the years.
Mi-24 Rotor blades not spinning - YouTube I'm sure there are more.
A snowblower tip
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Mi-24 Rotor blades not spinning - YouTube I'm sure there are more.
Garandman
Elite Member
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Dave M7040
Elite Member
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- Dec 10, 2012
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- Williamstown Ontario Canada
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- Kubota M7040 Nuffield 465
I am not try to argue with the frame rate scenario but would make a couple of points for people to ponder.
My experience is with an industrial strobe light for studying machinery. Adjusting the strobe frequency is like a camera frame rate except that it is adjustable whereas a camera's frame rate is fixed.
With the strobe, as you approach the rotational speed of what you are trying to study by having the image appear stopped, the rotating part will appear to first rotate one way and then the reverse as you approach, go by and then return to the actual rpm where its image is stopped.
When you look at a flying helicopter as was suggested, the rotor speed is not changing during the time you see it and so the camera frame rate will affect the recorded image if it is close to either the rotational rotor speed or a harmonic of that speed. By harmonic I am saying if the rotor speed is 1/2 or 2x rotor speed you will get the same altered image. The helicopter on the ground appears to have the blades reverse direction as it is idling so it is obviously rotating very close the the camera frame rate.
In the video of the noisy blower, the blower fan is slowing down around the 4 min mark and I don't see any reversing of the rotation.
You could be correct and I am not absolutely certain of my opinion.
The reason this subject came up was because people were looking for ways to improve the throwing distance of their blowers.
There is a design change on more modern blowers which likely was done to improve fan performance. On my blower the baffle is welded in place blocking the fan opening near the chute.
On the two ones I will post below the baffle is bolted on to make removing the fan much easier.
Adding the baffle would be a easy thing to do for someone looking for more performance. I marked with yellow lines where the baffle could go on the bobcat blower.
Dave M7040
My experience is with an industrial strobe light for studying machinery. Adjusting the strobe frequency is like a camera frame rate except that it is adjustable whereas a camera's frame rate is fixed.
With the strobe, as you approach the rotational speed of what you are trying to study by having the image appear stopped, the rotating part will appear to first rotate one way and then the reverse as you approach, go by and then return to the actual rpm where its image is stopped.
When you look at a flying helicopter as was suggested, the rotor speed is not changing during the time you see it and so the camera frame rate will affect the recorded image if it is close to either the rotational rotor speed or a harmonic of that speed. By harmonic I am saying if the rotor speed is 1/2 or 2x rotor speed you will get the same altered image. The helicopter on the ground appears to have the blades reverse direction as it is idling so it is obviously rotating very close the the camera frame rate.
In the video of the noisy blower, the blower fan is slowing down around the 4 min mark and I don't see any reversing of the rotation.
You could be correct and I am not absolutely certain of my opinion.
The reason this subject came up was because people were looking for ways to improve the throwing distance of their blowers.
There is a design change on more modern blowers which likely was done to improve fan performance. On my blower the baffle is welded in place blocking the fan opening near the chute.
On the two ones I will post below the baffle is bolted on to make removing the fan much easier.
Adding the baffle would be a easy thing to do for someone looking for more performance. I marked with yellow lines where the baffle could go on the bobcat blower.
Dave M7040
MinnesotaEric
Super Member
Dave, on a McKee snowblower if the auger is spinning top away from the fan and bottom toward the fan the fan is spinning in the right direction.
Dave M7040
Elite Member
- Joined
- Dec 10, 2012
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- 2,757
- Location
- Williamstown Ontario Canada
- Tractor
- Kubota M7040 Nuffield 465
Eric
Do we agree the bobcat blower fan has 4 blades?
Do we agree the bobcat chain drive for the auger is on the left side when facing the blower?
Look at all these photos of McKee blowers. The fans that I can see are all 3 bladed and the drive chains are on the right when you are facing the blower.
mckee snowblower photo - Google Search
My long gone McKee 720 was built that way too.
I have no Bobcat experience at all. Would this Bobcat or whatever skid steer it is have a front and rear pto?
When people take their rear 3 pt hitch farm tractor(not small kubota) blower and want to put it on the front of their tractor driven from the rear pto, they need a reverser gearbox to drive the pto from the rear to the front.
Dave M7040
Do we agree the bobcat blower fan has 4 blades?
Do we agree the bobcat chain drive for the auger is on the left side when facing the blower?
Look at all these photos of McKee blowers. The fans that I can see are all 3 bladed and the drive chains are on the right when you are facing the blower.
mckee snowblower photo - Google Search
My long gone McKee 720 was built that way too.
I have no Bobcat experience at all. Would this Bobcat or whatever skid steer it is have a front and rear pto?
When people take their rear 3 pt hitch farm tractor(not small kubota) blower and want to put it on the front of their tractor driven from the rear pto, they need a reverser gearbox to drive the pto from the rear to the front.
Dave M7040