Dennis Weatherly
Jun 01, 1996, 01:00 AM
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<title>An Easy Way To Calculate Wing Loadings</title>
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<pre>[Ed note: Take this and hang it on your shop wall. We need more charts
like this]
Well, I gave a shot at building a wing loading chart like Al
Eastman requested. I ran the numbers for wing areas from
100 to 1200 square inches and for ready-to-fly weights of 16
to 192 ounces (1 pound to 12 pounds). Naturally, all that
data doesn't fit worth beans into an email message! But if
you cut/save the following text and then pull it up in a
word processor that does fixed fonts, you'll be able to read
it just fine (Word using Courier 10 point works great). Or
paste it into a spreadsheet if you prefer.
Wing Loading Ounces/Square Foot
100 200 300 400 500 600 700 800 900 1000 1100 1200
16 23.0 11.5 7.7 5.8 4.6 3.8 3.3 2.9 2.6 2.3 2.1 1.9
32 46.1 23.0 15.4 11.5 9.2 7.7 6.6 5.8 5.1 4.6 4.2 3.8
48 69.1 34.6 23.0 11.5 13.8 11.5 9.9 8.6 7.7 6.9 6.3 5.8
64 92.2 46.1 30.7 23.0 18.4 15.4 13.2 11.5 10.2 9.2 8.4 7.7
80 115.2 57.6 38.4 28.8 23.0 19.2 16.5 14.4 12.8 11.5 10.5 9.6
96 138.2 69.1 46.1 34.6 27.6 23.0 19.7 17.3 15.4 13.8 12.6 11.5
112 161.3 80.6 53.8 40.3 32.3 26.9 23.0 20.2 17.9 16.1 14.7 13.4
128 184.3 92.2 61.4 46.1 36.9 30.7 26.3 23.0 20.5 18.4 16.8 15.4
144 207.4 103.7 69.1 51.8 41.5 34.6 29.6 25.9 23.0 20.7 18.9 17.3
160 230.4 115.2 76.8 57.6 46.1 38.4 32.9 28.8 25.6 23.0 20.9 19.2
176 253.4 126.7 84.5 63.4 50.7 42.2 36.2 31.7 28.2 25.3 23.0 21.1
192 276.5 138.2 92.2 69.1 55.3 46.1 39.5 34.6 30.7 27.6 25.1 23.0
My wing loading rule of thumb says to have about 100 square
inches per pound of model weight, which works out to 23.0
ounces/square foot. So, you can draw a line through the
chart at 23.0 oz/sq ft (it makes a nice diagonal line) and
then try to stay "close" to that range.
I tried to do Wing Cube Loading as well but I ran into some
problems. The EADA program Help says the formula is:
model weight (oz) / (wing area (sq ft) to 3/2 power)
The problem is that EADA won't determine a wing cube loading
until you select a motor/prop combo. There must be an
airspeed factor in there somewhere. I'll have to try and
find the original article in MB.
I hope this is useful. I know I hate trying to figure oz/sq
ft in my head!
--
Dennis Weatherly (503) 685-1176
Mentor Graphics Corporation <a href="http://rcgroups.com/shared/nospam.php?u=dennis_weatherly&d=mentorg.com">dennis_weatherly(at)mentorg.com</a>
Wilsonville, Oregon U.S.A.</pre>
</body>
</html>
<head>
<title>An Easy Way To Calculate Wing Loadings</title>
</head>
<body bgcolor="#FFFFFF">
<pre>[Ed note: Take this and hang it on your shop wall. We need more charts
like this]
Well, I gave a shot at building a wing loading chart like Al
Eastman requested. I ran the numbers for wing areas from
100 to 1200 square inches and for ready-to-fly weights of 16
to 192 ounces (1 pound to 12 pounds). Naturally, all that
data doesn't fit worth beans into an email message! But if
you cut/save the following text and then pull it up in a
word processor that does fixed fonts, you'll be able to read
it just fine (Word using Courier 10 point works great). Or
paste it into a spreadsheet if you prefer.
Wing Loading Ounces/Square Foot
100 200 300 400 500 600 700 800 900 1000 1100 1200
16 23.0 11.5 7.7 5.8 4.6 3.8 3.3 2.9 2.6 2.3 2.1 1.9
32 46.1 23.0 15.4 11.5 9.2 7.7 6.6 5.8 5.1 4.6 4.2 3.8
48 69.1 34.6 23.0 11.5 13.8 11.5 9.9 8.6 7.7 6.9 6.3 5.8
64 92.2 46.1 30.7 23.0 18.4 15.4 13.2 11.5 10.2 9.2 8.4 7.7
80 115.2 57.6 38.4 28.8 23.0 19.2 16.5 14.4 12.8 11.5 10.5 9.6
96 138.2 69.1 46.1 34.6 27.6 23.0 19.7 17.3 15.4 13.8 12.6 11.5
112 161.3 80.6 53.8 40.3 32.3 26.9 23.0 20.2 17.9 16.1 14.7 13.4
128 184.3 92.2 61.4 46.1 36.9 30.7 26.3 23.0 20.5 18.4 16.8 15.4
144 207.4 103.7 69.1 51.8 41.5 34.6 29.6 25.9 23.0 20.7 18.9 17.3
160 230.4 115.2 76.8 57.6 46.1 38.4 32.9 28.8 25.6 23.0 20.9 19.2
176 253.4 126.7 84.5 63.4 50.7 42.2 36.2 31.7 28.2 25.3 23.0 21.1
192 276.5 138.2 92.2 69.1 55.3 46.1 39.5 34.6 30.7 27.6 25.1 23.0
My wing loading rule of thumb says to have about 100 square
inches per pound of model weight, which works out to 23.0
ounces/square foot. So, you can draw a line through the
chart at 23.0 oz/sq ft (it makes a nice diagonal line) and
then try to stay "close" to that range.
I tried to do Wing Cube Loading as well but I ran into some
problems. The EADA program Help says the formula is:
model weight (oz) / (wing area (sq ft) to 3/2 power)
The problem is that EADA won't determine a wing cube loading
until you select a motor/prop combo. There must be an
airspeed factor in there somewhere. I'll have to try and
find the original article in MB.
I hope this is useful. I know I hate trying to figure oz/sq
ft in my head!
--
Dennis Weatherly (503) 685-1176
Mentor Graphics Corporation <a href="http://rcgroups.com/shared/nospam.php?u=dennis_weatherly&d=mentorg.com">dennis_weatherly(at)mentorg.com</a>
Wilsonville, Oregon U.S.A.</pre>
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