[Land-speed] ...Leaf Blower...

[joseph lance]

Hold on !!

215 MPH x 5280 ft/mile x hour/60 minutes = 18,920 ft/min or 315 ft/sec.

2.41 in2 x ft2 /144 in2 = 0.0167 sq feet.

18,920 ft/min x 0.0167 sq feet = 317 cfm

Just a thought---if anybody uses a leaf blower for flow experiments, it 
might be a good idea to put a flow straighter on the exit of the leaf blower 
to take out any swirl or flow asymmetry---maybe a fairly open cross section 
grid ( maybe 0.25 inch squares ?) about an inch or so deep.

Lance

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----- Original Message ----- 
From: "drmayf" <drmayf at mayfco.com>
To: "Ed Weldon" <23.weldon at comcast.net>
Cc: "LSR" <land-speed at autox.team.net>
Sent: Thursday, January 17, 2008 8:07 PM
Subject: Re: [Land-speed] Sorta On Topic...Leaf Blower...


> Ed, as I mentioned before, thanks for th einfo. It looks like a leaf
> blower wont hack it...but lemme check the numbers here...
>
> 215 mph = 215 * 88 /60 * 60    ft/min   = 18.920 ft/min. If I multiply
> the cross section in sq ft that would give me cfm...
>
> 18920 * 2.41 / 1728) = 26.38 cfm...
>
> bummer. Somehow or another I had my head up my anal orifice and was
> thinking it would be much larger than that. So now I gotta look for a
> bigger "sucker".  Maybe that idea about vacuum cleaner motors wasn't
> such a bad idea after all! Or an old 471 rootes blower hooked to an
> electric motor... this is getting too complicated, lol..
>
> mayf