Nov 28, 2012, 02:59 PM Registered User United States, MS, Biloxi Joined Feb 2012 599 Posts 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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 Nov 28, 2012, 03:18 PM Registered User United States, VA, Springfield Joined Feb 2000 1,504 Posts 1 g/sq dm = .328 oz/sq ft, so 46.2 g/sq dm is 15.1 oz/sq ft....
 Nov 28, 2012, 03:21 PM AMA 754 Phoenix area Joined Apr 2004 1,850 Posts ??? 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?
 Nov 28, 2012, 04:28 PM Wake up, feel pulse, be happy! United States, MN, Minneapolis Joined Aug 2009 13,216 Posts It's just a typo. Someone clearly didn't mind their "P"s and "Q"s, and now look what's happened
 Nov 28, 2012, 04:38 PM Rocket Programmer United States, AZ, Mesa Joined Jul 2007 26,037 Posts It's a nonstandard abbreviation for "grams per decimeter"
 Nov 28, 2012, 04:46 PM Registered User United States, MS, Biloxi Joined Feb 2012 599 Posts Thanks!
Nov 28, 2012, 04:48 PM
Registered User
United States, MS, Biloxi
Joined Feb 2012
599 Posts
Quote:
 Originally Posted by BobRCnut ??? 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!
Nov 29, 2012, 03:12 AM
Registered User
New Zealand, Canterbury, Rolleston
Joined Oct 2011
1,628 Posts
Quote:
 Originally Posted by Dr.JJ 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.
 Nov 29, 2012, 05:51 AM Registered User United States, VA, Springfield Joined Feb 2000 1,504 Posts None of them are obsolete, although furlongs and fortnights can be considered archaic... Last edited by pmisuinas; Nov 29, 2012 at 09:38 AM.
Nov 29, 2012, 06:07 AM
222 km/hr Parkjet flyer
Latvia, Ventspils pilsēta, Ventspils
Joined Jan 2010
13,684 Posts
Quote:
 Originally Posted by Mac50L 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
 Nov 29, 2012, 07:10 AM An itch?. Scratch build. South Wales U.K. Joined Mar 2003 16,381 Posts 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.
 Nov 29, 2012, 07:16 AM Wake up, feel pulse, be happy! United States, MN, Minneapolis Joined Aug 2009 13,216 Posts "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!"
 Nov 29, 2012, 07:30 AM An itch?. Scratch build. South Wales U.K. Joined Mar 2003 16,381 Posts 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).
 Nov 29, 2012, 09:40 AM Registered User United States, VA, Springfield Joined Feb 2000 1,504 Posts That's a quite good approximation, will get you within 2%...
Nov 29, 2012, 04:08 PM
Registered User
New Zealand, Canterbury, Rolleston
Joined Oct 2011
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Quote:
 Originally Posted by solentlife 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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