BE vs Mosmatic video

810f250

810f250

Griffs Services PowerWash
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Nigel

Good info, thanks for taking the time. I think it's better to just get rid of the gun and run full size hose right to a ball valve, I saw a difference on mine and the gun was rated at 12 gal/min. Can you adjust the tilt of the nozzles? That will sure affect the rpm! The mosmatic did sound a little slow. I don't believe a few degrees of tilt affects the impact significantly.
 
Are they welded? If they're threaded just give em a crank, maybe a little heat for the thread lock.
 
Great video Nigel, Thanks.

Because of the larger surface cleaner, that spray bar might never reach the rpm's of the smaller surface cleaner because there is more mass to move and with the added water capacity in the tubes, it is even more mass to move (rpm's).

When comparing a larger surface cleaner to a smaller surface cleaner, the smaller might always spin faster when using the same psi and gpm machine because of the shorter length spray bars, less mass of the bars and less water capacity.

Maybe the real test is get similar areas of concrete to clean and do one side with the larger surface cleaner and then do the other and time both and see which one gets more area cleaned faster.

That new Mosmatic surface cleaner sure is nice looking.

I agree, for that reputation, what you are paying for that surface cleaner, they really should have packed it in that box better and had the seal faces in separate bags in that bag to protect the seal faces.

Just my opinion.
 
Christopher said:
Great video Nigel, Thanks.

Because of the larger surface cleaner, that spray bar might never reach the rpm's of the smaller surface cleaner because there is more mass to move and with the added water capacity in the tubes, it is even more mass to move (rpm's).

When comparing a larger surface cleaner to a smaller surface cleaner, the smaller might always spin faster when using the same psi and gpm machine because of the shorter length spray bars, less mass of the bars and less water capacity.

Maybe the real test is get similar areas of concrete to clean and do one side with the larger surface cleaner and then do the other and time both and see which one gets more area cleaned faster.

That new Mosmatic surface cleaner sure is nice looking.

I agree, for that reputation, what you are paying for that surface cleaner, they really should have packed it in that box better and had the seal faces in separate bags in that bag to protect the seal faces.

Just my opinion.
Click to expand...

Good points Chris, but I would think the mass difference is not that great, but I would measure it, I also ran the mosmatic for 20 mins or so, it was even spinning slower right out of the box, I will report on the speed as the hours increase (The grease may not be in its optimal working state) The mosmatic swivel did leak for the first 20 seconds the trigger was pulled but after I released it and pulled the trigger again, it stopped.
 
David Potter said:
nigel great video ...2 questions Ive only used 2 bar before why use a 3 bar
also how much was the mossmatic ? and why 3 weeks non stocking Item
Thanks again for videoi
Click to expand...

Thank You David:

My pump specs are in the vicinity of 8 gallons per min (TSF2021)
Theoretically I could run a 2 bar on that surface cleaner.

I would have to use the machines pump output gpm divided by the number of nozzles and the answer is close to the orifice size of the nozzle best suited for two bar operation. (8 / 2 = 4)

On the other hand if I used a 3 bar, I would apply the same formula (8 / 3 = 2.67) , I would use a 2.5 nozzle

Theoretically 2 spray bars (not arms) the same diameter and speed (rpm's) , supplied by the same pressure and pump flow, equipped respectively with the same angle nozzle with respective orifices to yield the maximum cleaning units at each nozzle for 2 and 3 arms should have different production rates.

The 3 arm would have to turn 120 degrees to complete a full circular cleaned path, whereas the 2 arm would have to turn 180 degrees.

Thats just the basic outlook at a 2 vs 3 arm but there are some other factors to be considered, example (for the same criteria above)

Lets say I use the orifices recommended above at 15 degrees for the following:

2 Arm .....4.0 nozzle...... that should equate to 4 gpm each (but does not fully equate to this rational, because the supplied pressure is not 4000psi {TSF2021 rated at 3600 psi max}, see your nozzle chart or calculator, its more in the range 3.70 gpm per nozzle for 3400 psi nozzle pressure [200 psi in pressure losses])

3 Arm .....2.5 nozzle...... that should equate to 2.5 gpm each (bypassing 0.5gpm to the tank, but does not fully equate to this rational , explained above, its in the range of 2.3 gpm at 3400 psi nozzle pressure)

However, 4 gpm at the same pressure as 2.5gpm ( through there respective nozzles) has a higher cleaning unit capacity.

It is the cosmetic cleaning industries experience that the cleaning units from 2.5 nozzles between 3000psi an 3500psi in a surface cleaner is sufficient for most cleaning requirements.(industrial cleaning may require more of both)

Hence I went with the 3 bar.

Yes, it was a non stock item, i was disappointed somewhat.
 
810f250 said:
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Click to expand...

Besides the extra weight of the longer bar and water in it as Chris mentioned. I missed this very important point.

Even if the rpms of both the Whirl-A-Way and the Mosmatic are exactly the same the Mosmatic would sound slower over the storm drain cover, because the additional circumferential distance the Mosmatic nozzle has to travel.

See the attached figure.

The arc distance of "a" to "b" is less than "A" to "B"

Whirl-A-Way 20"
Mosmatic 30"

Circumference of a circle = Pie x Diameter

Whirl-A-Way = 3.14 x 20 = 62.8 inches

Mosmatic = 3.14 x 30 = 94.2 inches

Percentage increase {(94.2-62.8) / (62.8)} X 100%= 50% increase (that is huge)

The additional distance each nozzle has to travel is (94.2 - 62.8)/ 3 = 10.47 inches (divided by 3, because it is a 3 bar) it would take more time even at the same swivel rpm of each.


I did not mean to mislead anyone with this video.

I need a non contact strobe light to see the actual RPM differences if there is any. Sorry again
 

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810f250 said:
it would take more time even at the same swivel rpm of each.
Click to expand...


This portion is false (my bad),

at the same rpm, the arm outer edge speed is greatest the further the distance out from the center,

the outer edge of the arm on the Mosmatic has the same angle to cover as the outer edge of the Whirl-A-Way but over more circumference in the same time hence a higher arm outer edge tip speed (meters per second) for the same rpm (revolutions per minute).


Arm outer edge speed varies with distance from center with the same rpms.
 
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