Tapered Nozzle

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The LB5800 operator’s manual states that there is a tapered and a flat nozzle included with the blower. The tapered nozzle is required to increase the air speed from 145 MPH to 168 MPH. When will this nozzle be available to purchase for use with the LB5302 and LB5754 blowers?
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Bruce

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Posted 2 months ago

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thomas h ginski

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i've used the tapered nozzle on my 575, but prefer the airflow without it .. the tapered nozzle seems to decrease the airspeed or flow .. the open tube works best for me.
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Bruce

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I believe that the nozzle you are referring to is the flat one, AN5300, which only alters the air flow but does not increase it. The tapered nozzle included with the LB5800 blower actually increases air speed by 23 MPH or almost 16%. If that nozzle was available for other models, the air speed should increase proportionately.
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SCDC, Champion

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Remember that this type of blower design does not produce much pressure, therefore restricting airflow does not increase air speed, but reduces it.  This type of design pushed air volume, not air pressure.  CFM.  And honestly, CFM rocks.

The nozzle is great for fanning out the air pattern and moving light things like clippings and finer debris.
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TheAtomTwister

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You can increase the speed by restricting the flow to a 76mm nozzle, but not any smaller at all, or it will just back up.  The speed noticeably increases and the Newton force goes up as well.  I've made three of these tapered attachments, and I got lucky enough to get the diameter perfect on the first few tries.  The nozzle with no attachments is slightly more than 81mm new and unused for my 575 unit.  So my tapered attachment does not restrict the flow much at all, but it does just the right amount to make a noticeable positive difference.
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Bruce

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As you stated, the flat nozzle AN5300, changes the air pattern but does not increase air speed.
The tapered nozzle, not yet available for sale, does increase air speed. The LB5800 operator’s manual states this on page 11 - https://cdn.shopify.com/s/files/1/026...?
I was asking when the tapered nozzle will be available for use with other EGO blowers. This should also enhance their performance.
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SCDC, Champion

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It will probably increase speed but decrease CFM.  there is always a trade off with this type of blower design.  You just cannot restrict the airflow as there is not much static pressure.
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TheAtomTwister

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This is essentially a reiteration of a point I already made, but yes, you can restrict the flow, just not very much; there is just enough static pressure to restrict it to about 88% of the restriction that there is with no attachments for the 575 unit, and that happens to be ever so slightly too much for the 530 unit with a stock EDF.  A 78mm tapered attachment would be perfect for the 530 if I remember correctly since I've long since put a 575 unit's EDF into my 530 unit.   You'll find that RC plane hobbyists taper the flow of EDFs all the time.  It might be a bad idea to mention this last part because it might make me be construed as rude, but I'll take that risk and say it, I'm the one who suggested the idea of adding a tapered attachment in the first place. It did take me some trial and error to discover that this works.
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TheAtomTwister

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So yes, with that expressed, different levels of tapering would be ideal for different units, 78mm for 530, 76mm for 575, and I do not remember what is perfect for the backpack blower, but I know it's more than 76mm.  I'll know what the diameter is once I find that Dickie's cup I used to make it.  Lastly, while I have not confirmed this with instruments, based on the feel of the unit with the tapered attachment put on at different angles and its performance, I do think its newton force went up with the attachment on, so if that is so, then the CFM did not go down enough to offset the increase in speed if the CFM went down by any significant amount at all.
(Edited)