# RE: Flagpole calc

• To: seaint(--nospam--at)seaint.org, seaint(--nospam--at)seaint.org
• Subject: RE: Flagpole calc
• From: Neil Moore <nmoore(--nospam--at)innercite.com>
• Date: Sat, 22 Sep 2001 15:55:58 -0700
```Check ANSI/NAAMM FP 1001-97  - Guide Specifications for Design of Metal
Flagpoles.

for nylon and cotton flags:
Wf = .0010 x V^2 x (area flag)^.5 x Ch     Equation 4

for polyester flags:

Wf = .0014 x V^2 x (area flag)^.5 x Ch      Equation 5

where:

Wf = flag load on pole in pounds
V = 3-secion gust wind speed in miles (Refer to Figure 3.2.2)  <you'll have
to get this on your own!!!>
Area flag in square feet
Ch = coefficient of height for wind pressure from Table 3.2.3A, calculated
at top of flag.

Neil Moore, S.E.
neil moore and associates
shingle springs, california

At 11:39 AM 9/19/2001 -0400, Albert Meyer wrote:
>I had been wondering this myself, and I agree that for a banner attached on
>two sides the sail area with the appropriate factor for vortex shedding is
>correct, but is this also reasonable for a flag attached on one side only?
>Are there any references for what the appropriate shape factor is?
>
>Albert J. Meyer, Jr., P.E.
>Martin-Espenlaub Engineering
>(215) 665-8570 Tel
>(215) 561-5064 Fax
>ameyer(--nospam--at)martinaia.com
>
>
>-----Original Message-----
>From: Matthew Stuart [mailto:m.stuart(--nospam--at)aespj.com]
>Sent: Wednesday, September 19, 2001 11:12 AM
>To: seaint(--nospam--at)seaint.org
>Subject: RE: Flagpole calc
>
>
>Sail area my friend along with the appropriate shape factor increase for
>vortex shedding.
>
>-----Original Message-----
>From: Bart Kemper [mailto:bkemper(--nospam--at)bigdogz.com]
>Sent: Wednesday, September 19, 2001 10:49 AM
>To: seaint(--nospam--at)seaint.org
>Subject: Flagpole calc
>
>
>I don't have a problem with the "structural" side of the calcs...but how
>do you calculate the windload on a banner/flag at xxx mph wind?  Thanks.
>
>Bart Kemper
>
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