Impeller/blower blade shape and angle of attack. - Snowblower Forum : Snow Blower Forums
 
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post #1 of 9 Old 03-17-2015, 04:48 PM Thread Starter
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Impeller/blower blade shape and angle of attack.

On my older blower the impeller blade is very flat where it crosses the chute opening and has a mild j bend towards the input side. It intersects with a backing plate at 90 degrees and is a perfectly straight line from the impeller shaft.

I looked at a Honda yesterday and the impeller was much more u shaped where it crosses the discharge chute and had no backing plate. I couldn't tell if there was any angle change fore or aft. We all know the Hondas throw nicely. It would seem the u shape would confine and centralize the discharge stream.

So maybe if one was to break out the welder and start playing.... I thinking of adding some fillet plates between the backing plate and blade and increasing the j bend on the input.

I do have an extra impeller. Any design thoughts?

RAYAR?

1978 Ariens 924032 Teardrop repowered with a 1992 Tec 8 hp.

Last edited by Ken05; 03-17-2015 at 04:58 PM.
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post #2 of 9 Old 03-18-2015, 03:00 AM
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Hi Ken05
The biggest issue is going to be the balance of the impeller. It wouldn't take much to put it out and besides vibration being introduced, the impeller's bearing likely won't last too long. The impeller should be spinning in the 1000+ RPM range, therefore you would need a way to check the balance after modifying it.

The impeller on the Honda you mention sounds somewhat similar to the impeller I recently saw on an Ariens 927LE (2008) not sure if I got those letters right on the model. That one is waiting for an engine, but the fella said they throw real nice which is what I figured by the design of that impeller. I would like to see one of them in action.

~Ray~
~1975 Canadiana 1026 Heavy Duty w/light & limited slip differential (& custom exhaust (need to fabricate manifold), customized impeller housing, removable chute in about 5 sec) (currently out of service)

~ Craftsman 8/25 Trac-Drive C950-52671 (mid 80's ???) (current user) (replaced blown engine with original, now in service again)

~ Craftsman 12/32 OHV 71-52112-1 (now in service)

~Noma GP 1028EL (repaired and serviced for daughter to use)
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post #3 of 9 Old 03-18-2015, 09:16 AM
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Quote:
Originally Posted by Ken05 View Post
On my older blower the impeller blade is very flat where it crosses the chute opening .......

I looked at a Honda yesterday and the impeller was much more u shaped where it crosses the discharge chute and had no backing plate. .....
My 2015 Platinum 30 SHO has much the same impeller design as you describe for the Honda. My impeller is 14" but I think Ariens Compact 22 (920013) and 24 (920021) have a 12" impeller that looks to be a similar design but I have not seen the cupped impeller close-up on those machines. It may be easier to adjust for any shaft diameter issue than adjust the shape of your impeller.

Good luck.

2015 Ariens Platinum 30 SHO - model 921040
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post #4 of 9 Old 03-18-2015, 02:35 PM
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Here are some pictures of the cup shaped impeller blades on my machine.
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2015 Ariens Platinum 30 SHO - model 921040
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post #5 of 9 Old 03-18-2015, 02:44 PM
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Interesting!

I notice it also has only 3 blades.

I know conventional wisdom says more blades = better, but my personal experience is the opposite. I have owned a few Ariens 'blowers, all with 4-blade 12" impellers, and their throwing performance is "good". But my first 2-stage 'blower was a Hahn-Eclipse with 2-blade impeller and it definitely threw farther than any of the Ariens.

Obviously there could be many other factors at play, including impeller RPM. But one I can say was not in play was engine horsepower, because when I got my first Ariens, the engine that I put on it was the one off the Hahn-Eclipse (a 6HP Tecumseh).

~1994 Ariens 924084 (ST1032) "papa bear": restored, re-engined, real nice!
1991 Ariens 924050 (ST824) "mama bear"
Toro PowerCurve 1800 "baby bear"

Be alert! America needs more lerts.
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post #6 of 9 Old 03-18-2015, 05:55 PM Thread Starter
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Good input guys. Looks like three blade cupped impeller is the way to go now. I found a good pic of the newer style here:
Ariens Snowblower Impeller 03835551 Order now for same day shipping. 365 day return policy. RepairClinic.com

Certainly look like it would concentrate more snow in a smaller place. It also has a much smoother blade. The old one has a structural stamping in right near where the snow exits. Might be the next must do mod.
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1978 Ariens 924032 Teardrop repowered with a 1992 Tec 8 hp.
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post #7 of 9 Old 03-18-2015, 06:45 PM
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I wonder how important that turned up bend is. My impeller mod did not include rubber at the bend. Some people extend rubber to the bent area, some don't.
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post #8 of 9 Old 03-19-2015, 03:42 AM
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That Ariens impeller sure looks like it would do a sweet job. That's the one I saw and was impressed by. Would like to see that one in action someday.

~Ray~
~1975 Canadiana 1026 Heavy Duty w/light & limited slip differential (& custom exhaust (need to fabricate manifold), customized impeller housing, removable chute in about 5 sec) (currently out of service)

~ Craftsman 8/25 Trac-Drive C950-52671 (mid 80's ???) (current user) (replaced blown engine with original, now in service again)

~ Craftsman 12/32 OHV 71-52112-1 (now in service)

~Noma GP 1028EL (repaired and serviced for daughter to use)
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post #9 of 9 Old 03-19-2015, 05:03 PM Thread Starter
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Well - I just ordered the 12" 3 blade 03835551 from the dealer today. From the looks of things it might be 2016 before we find out how it works though.

1978 Ariens 924032 Teardrop repowered with a 1992 Tec 8 hp.
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