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Post by azwood on Oct 27, 2018 19:27:31 GMT -5
Checked my impeller last night its 190mm that explains how it starts mine with only 7500rpms and it's 550fps but a little more would help it takes a bit to spool up
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Post by turboron on Oct 27, 2018 20:13:20 GMT -5
azwood, is the 190mm (7.48") the outside diameter? Note that the Cyclone blower is 916 fps at full song. My formula for tip speed is equal to 3.14*Diameter in inches * rpm divided by 720. This gives a 245 fps for your impeller.
Thanks, Ron
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Post by azwood on Oct 27, 2018 21:13:08 GMT -5
azwood, is the 190mm (7.48") the outside diameter? Note that the Cyclone blower is 916 fps at full song. My formula for tip speed is equal to 3.14*Diameter in inches * rpm divided by 720. This gives a 245 fps for your impeller. Thanks, Ron Yeah its 190od seems like specks were false lol |
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Post by azwood on Oct 27, 2018 21:35:32 GMT -5
It may have been 550cfm
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Post by enginewhisperer on Oct 28, 2018 4:16:21 GMT -5
leaf blowers are usually rated on outlet air speed (from the nozzle) or flow (cfm, etc)
A lot of the ebay ones have some pretty random specs which are probably nowhere near true.
I tested my 46cc backpack petrol leaf blower fairly recently:
6500rpm
230mm impeller OD
1psi max pressure
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Post by turboron on Oct 28, 2018 7:52:25 GMT -5
whisperer, what is your flow? Do you have it in cfm or outlet air speed?
Thanks, Ron
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Post by enginewhisperer on Oct 28, 2018 17:45:32 GMT -5
I don't have any flow numbers on it.
Specs I could find are:
900m³/hr
Air velocity 47m/s
1.25kw
there are also claims of 540km/h air speed....
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Post by turboron on Oct 28, 2018 19:51:52 GMT -5
whisperer, thanks.
Thanks again, Ron
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Post by azwood on Oct 29, 2018 4:59:19 GMT -5
Got one fuel tank done and leak tested its probably way to . much fuel but at least I shouldn't run out id say I should have 25l or so  |
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Post by turboron on Oct 30, 2018 20:35:35 GMT -5
John, search under Fiberglass Reinforced (FRP) blowers for a starter blower. They have 800 cfm at up to 45" wg blowers available. However, I am not sure of the speeds.
Thanks, Ron
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Post by racket on Oct 30, 2018 22:16:04 GMT -5
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Post by turboron on Oct 31, 2018 7:05:33 GMT -5
John, is the 24 volt diesel starter still the right motor for a 3600 rpm fan. I was hoping to find a higher rpm fan but no joy.
Thanks, Ron
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Post by racket on Nov 1, 2018 4:08:28 GMT -5
Hi Ron
The Denso diesel starters go up to 7 Kw , with the redux gearbox removed they'll have plenty of rpm , I'd guess they'd simply rev out until power supplied equals power required
Cheers
John
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Post by azwood on Nov 1, 2018 15:47:01 GMT -5
Hi Ron The Denso diesel starters go up to 7 Kw , with the redux gearbox removed they'll have plenty of rpm , I'd guess they'd simply rev out until power supplied equals power required Cheers John How would I go about getting 24v and 12v from the same set of battery's i can run the starter and oil pump on 24v but not all other stuff. |
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barnyard
Member
Joined: October 2016
Posts: 36 
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Post by barnyard on Nov 1, 2018 16:51:22 GMT -5
Azwood I’ve ran 12 and 24v from the same set of batteries before with no issues. Connect two 12v batteries in series, you will get 24v when measured across both, or 12v across one battery. The only down side I’m aware of is charging. Because the two batteries will drain at different rates, it’s best to charge each battery separately with a 12v charger.
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