Snow 47 Blower Not Throwing Snow Very Far

[dirtworksequip]

FYI The force it throws snow is proportional to speed squared. The volume of snow it is able to throw is proportional to speed. Thus power required to throw snow is proportional to speed cubed. In other words to double the speed the required power demand increases eight times and it should throw twice as much snow four times as far. Needles to say that this is valid for ideal case and maximum flow of snow.

Was this formula one of Newton's "lost laws" ?

Sincerely, Dirt

 

[Redneck in training]

Was this formula one of Newton's "lost laws" ?

Sincerely, Dirt

I just test big compressors for living. Believe it or not the impeler is a simple compressor so I thought that somebody might be interested in the relationship between rpm, required power, snow volume and throving distance.

 

[mfreund]

What bad luck!! We are supposed to get to near 50 on Saturday so at least what we have will melt. I hope we won't get much more this year!!

 

[Karl2]

I don't think a 1/4 " difference in impeller is the problem.

You would be surprised, I certainly was. Two-stage blowers use the air pressure created by the impeller inside the chute (discharge) to propel snow and depending on volume a small difference in blade clearance can translate into a large difference in air pressure.

Interestingly some walk-behind blowers such as those made by Honda use advanced impeller/chute designs that produce rather spectacular throwing performance despite relatively modest hp, they routinely achieve throwing distance of 60 to 100 feet using 7 to 9 hp engines. If such designs were available for tractor blowers I could throw snow clear across town I imagine.

Seriously though, more advanced designs could allow smaller tractors to achieve better results.

 

[Redneck in training]

You would be surprised, I certainly was. Two-stage blowers use the air pressure created by the impeller inside the chute (discharge) to propel snow and depending on volume a small difference in blade clearance can translate into a large difference in air pressure.

Interestingly some walk-behind blowers such as those made by Honda use advanced impeller/chute designs that produce rather spectacular throwing performance despite relatively modest hp, they routinely achieve throwing distance of 60 to 100 feet using 7 to 9 hp engines. If such designs were available for tractor blowers I could throw snow clear across town I imagine.

Seriously though, more advanced designs could allow smaller tractors to achieve better results.

Due to the fact that aerodynamic drag acting on snow increases with the square of velocity the throwing distance might not increase as much but the volume of snow thrown will be proportional to power consumed by the impeller.

The design of the impeler is absolutely crucial to efficiency of the thrower. Simple designs just wouldn't achieve it.

 

[irvingj]

I'll go along with the impeller-to-housing clearance issue-- my ol' Toro walk-behind would have some serious throwing problems due to bent impeller blades ..rocks... While it never dropped to one foot, it would easily halve the normal 6-8 feet to 3-4 feet.

Heated & bent blades back into position twice, then went ahead & replaced impeller. The difference was due to an increase in the clearance from 1/4" or less to 3/8" to 1/2"-- enough to seriously affect throwing distance!

Took me a while to figure out just what the problem was, but when I put 2 & 2 together it all made sense. With the clearance dropped back to normal, machine acted like it was new again!

Too bad it didn't have bolt-on (replaceable) tips on the impeller; at one point I considered trying to make some, but that may be a bit beyond my talents. Still sounds like a good idea, though.