Question What is sp. dm?

 #1 Dr.JJ Nov 28, 2012 02:59 PM

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?

 #2 pmisuinas Nov 28, 2012 03:18 PM

1 g/sq dm = .328 oz/sq ft, so 46.2 g/sq dm is 15.1 oz/sq ft....

 #3 BobRCnut Nov 28, 2012 03:21 PM

??? 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?

 #4 C₄H₁₀ Nov 28, 2012 04:28 PM

It's just a typo. Someone clearly didn't mind their "P"s and "Q"s, and now look what's happened :rolleyes:

 #5 jasmine2501 Nov 28, 2012 04:38 PM

It's a nonstandard abbreviation for "grams per decimeter"

 #6 Dr.JJ Nov 28, 2012 04:46 PM

Thanks!

 #7 Dr.JJ Nov 28, 2012 04:48 PM

Quote:
 Originally Posted by BobRCnut (Post 23387948) ??? 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!

 #8 Mac50L Nov 29, 2012 03:12 AM

Quote:
 Originally Posted by Dr.JJ (Post 23388692) 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.

 #9 pmisuinas Nov 29, 2012 05:51 AM

None of them are obsolete, although furlongs and fortnights can be considered archaic...

 #10 solentlife Nov 29, 2012 06:07 AM

Quote:
 Originally Posted by Mac50L (Post 23392481) 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

 #11 eflightray Nov 29, 2012 07:10 AM

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. ;)

 #12 C₄H₁₀ Nov 29, 2012 07:16 AM

"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!"

 #13 eflightray Nov 29, 2012 07:30 AM

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).

 #14 pmisuinas Nov 29, 2012 09:40 AM

That's a quite good approximation, will get you within 2%...

 #15 Mac50L Nov 29, 2012 04:08 PM

Quote:
 Originally Posted by solentlife (Post 23393007) 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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