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Old Nov 28, 2012, 03:59 PM
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Question
What is sp. dm?

Under the wing load this airplane said 46.2g sp.dm. Im used to oz/sq ft. What is sp. dm and how can i convert it?
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Old Nov 28, 2012, 04:18 PM
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1 g/sq dm = .328 oz/sq ft, so 46.2 g/sq dm is 15.1 oz/sq ft....
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Old Nov 28, 2012, 04:21 PM
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??? Sometimes, wing AREA is expressed as SQ. DM. (square decimeters), but I can't recall any metric units of weight that would fit 'SP'. Does this plane have an airspeed indicator calibrated in furlongs per fortnight?
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Old Nov 28, 2012, 05:28 PM
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It's just a typo. Someone clearly didn't mind their "P"s and "Q"s, and now look what's happened
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Old Nov 28, 2012, 05:38 PM
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It's a nonstandard abbreviation for "grams per decimeter"
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Old Nov 28, 2012, 05:46 PM
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Thanks!
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Old Nov 28, 2012, 05:48 PM
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Quote:
Originally Posted by BobRCnut View Post
??? Sometimes, wing AREA is expressed as SQ. DM. (square decimeters), but I can't recall any metric units of weight that would fit 'SP'. Does this plane have an airspeed indicator calibrated in furlongs per fortnight?
The replys are much appreciated, its just this made me smile cause I have no idea what a furlong or fortnight is But I have been trying to read alot. There is a big learning curve!
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Old Nov 29, 2012, 04:12 AM
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Originally Posted by Dr.JJ View Post
The replys are much appreciated, its just this made me smile cause I have no idea what a furlong or fortnight is But I have been trying to read alot. There is a big learning curve!
1 furlong = 201 metres

1 fortnight = 2 weeks

Furlongs are an old obsolete measure of distance like ounces are also an obsolete measure of weight. At least one of them is still used in the USA.
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Old Nov 29, 2012, 06:51 AM
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None of them are obsolete, although furlongs and fortnights can be considered archaic...
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Old Nov 29, 2012, 07:07 AM
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Quote:
Originally Posted by Mac50L View Post
1 furlong = 201 metres

1 fortnight = 2 weeks

Furlongs are an old obsolete measure of distance like ounces are also an obsolete measure of weight. At least one of them is still used in the USA.
And you coming from a Rugby and Cricket country ????

Nigel
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Old Nov 29, 2012, 08:10 AM
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Furlongs and Fortnights are horse racing terms.

The Furlong being a measure of distance.

The Fortnight, how long before the horse you backed comes in.
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Old Nov 29, 2012, 08:16 AM
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"Oh my, the dog's fur is getting long. Time for a trip to see the groomer."

"Welcome to Fort Night: The giant lock-in slumber party in a genuine Civil War army post!"
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Old Nov 29, 2012, 08:30 AM
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If I remember correct, there is a rough conversion of about 3:1

oz/sq.ft , times 3 = grams/sq.dm , (approximately)

grams/sq.dm , divided by 3 = oz/sq.ft , (approximately).
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Old Nov 29, 2012, 10:40 AM
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That's a quite good approximation, will get you within 2%...
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Old Nov 29, 2012, 05:08 PM
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Originally Posted by solentlife View Post
And you coming from a Rugby and Cricket country ????

Nigel
And I apologise for that. I've never played either of them. I played football, a game where the ball is moved by striking it with the foot, hence the name of it being (surprise, surprise) Football.
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