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  #1  
Old 10-07-2018, 01:16 AM
therock therock is offline
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Default Question About Opening In Deck @Spindles

2003 Z-Force 44 3-high lift blades.
I'm curious if this opening behind my spindles. Is it by design or to fit another type of spindle?
Once in a blue moon a sweet gum tree pod will escape here and take a trip around a pulley courtesy the belt.

Thanks

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Old 10-07-2018, 01:46 PM
dale c. dale c. is online now
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Those let the air come up through to create better vacuum.
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Old 10-07-2018, 02:10 PM
J-Mech J-Mech is offline
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those let the air come up through to create better vacuum
Really. I'm skeptical. Convince me.
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Old 10-07-2018, 02:57 PM
R Bedell R Bedell is offline
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Quote:
Those let the air come up through to create better vacuum.
I don't know if that is what the MTD Engineers were thinking, but as a HVAC/R Technician, sounds plausible to me.
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Old 10-07-2018, 05:57 PM
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cooperino cooperino is offline
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sounds plausible to me.
Same here... At some point a deck can only move so much air. I think of a fan with the back side of the guard covered. Can't move much air that way. Maybe they figured out that allowing some air in through there made it possible to create more air flow.
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Old 10-07-2018, 06:10 PM
J-Mech J-Mech is offline
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The air needs to flow out the discharge. If it flows up out the top of the deck, it would spit grass out up there too.
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Old 10-07-2018, 06:11 PM
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The air needs to flow out the discharge. If it flows up out the top of the deck, it would spit grass out up there too.
My thinking was it is pulling air in from those holes.... Like a venturi
Think maybe Dale meant down through not up
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Old 10-07-2018, 06:53 PM
R Bedell R Bedell is offline
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The air needs to flow out the discharge. If it flows up out the top of the deck, it would spit grass out up there too.
That's one way to look at it.
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Old 10-07-2018, 08:38 PM
J-Mech J-Mech is offline
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My thinking was it is pulling air in from those holes.... Like a venturi
Think maybe Dale meant down through not up
Since the wing on the blades pushes air upwards, creating a vacuum below them.... I'm not sure how that would work, or help. You want the air to flow through the grass and under the edges of the deck. If air is introduced from above, it would cancel the vacuum affect below. That would kind of defeat the purpose, would it not? Am I the only person who thinks this stuff through? Come on. Both you guys are smart guys.
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Old 10-07-2018, 08:50 PM
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Since the wing on the blades pushes air upwards, creating a vacuum below them.... I'm not sure how that would work, or help. You want the air to flow through the grass and under the edges of the deck. If air is introduced from above, it would cancel the vacuum affect below. That would kind of defeat the purpose, would it not? Am I the only person who thinks this stuff through? Come on. Both you guys are smart guys.
I have thought it through some.
First thing I thought of is air in the deck needs to moves in two directions. Vertically, and horizontally. The wings of the blades are on the outer most part. The hole we are looking at is close to the shaft. Think of a tornado. The outer part spins and pushes away like crazy yet its the inner part that becomes a vacuum.

I had a deck similar to that in the way that there were openings. I never had to clean them out. They always seemed to remain open. I never thought much of it honestly till this question came up. But now I sort of feel like they must pull air in.

Edit. Small holes would not "cancel" the vacuum I don't think. It would change the draft certainly tho.
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