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Nov 28, 2012, 02:59 PM
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Joined Feb 2012
254 Posts
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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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Nov 28, 2012, 03:18 PM
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Springfield, VA
Joined Feb 2000
876 Posts
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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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Nov 28, 2012, 03:21 PM
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Phoenix area
Joined Apr 2004
1,472 Posts
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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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Nov 28, 2012, 04:28 PM
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United States, MN, Minneapolis
Joined Aug 2009
10,962 Posts
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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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Nov 28, 2012, 04:38 PM
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United States, CO, Golden
Joined Jul 2007
22,620 Posts
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It's a nonstandard abbreviation for "grams per decimeter"
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Nov 28, 2012, 04:46 PM
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Joined Feb 2012
254 Posts
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Thanks!
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Nov 28, 2012, 04:48 PM
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Joined Feb 2012
254 Posts
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Quote:
 But I have been trying to read alot. There is a big learning curve!
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Nov 29, 2012, 03:12 AM
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New Zealand, Canterbury, Rolleston
Joined Oct 2011
623 Posts
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Quote:
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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Nov 29, 2012, 05:51 AM
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Springfield, VA
Joined Feb 2000
876 Posts
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None of them are obsolete, although furlongs and fortnights can be considered archaic...
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Last edited by pmisuinas; Nov 29, 2012 at 09:38 AM.
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Nov 29, 2012, 06:07 AM
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Latvia / UK visits
Joined Jan 2010
4,564 Posts
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Quote:
Nigel |
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Nov 29, 2012, 07:10 AM
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South Wales U.K.
Joined Mar 2003
10,506 Posts
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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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Nov 29, 2012, 07:16 AM
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United States, MN, Minneapolis
Joined Aug 2009
10,962 Posts
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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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Nov 29, 2012, 07:30 AM
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South Wales U.K.
Joined Mar 2003
10,506 Posts
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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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Nov 29, 2012, 09:40 AM
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Springfield, VA
Joined Feb 2000
876 Posts
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That's a quite good approximation, will get you within 2%...
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Nov 29, 2012, 04:08 PM
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New Zealand, Canterbury, Rolleston
Joined Oct 2011
623 Posts
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Quote:
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