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ACRO E-mail Archive Thread: [Acro] RE: S1S aux fuel tank capacity?

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ACRO E-mail Archive Thread: [Acro] RE: S1S aux fuel tank capacity?


Thread: [Acro] RE: S1S aux fuel tank capacity?

Message: [Acro] RE: S1S aux fuel tank capacity?

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From: "Peter Ashwood-Smith" <petera at>

Date: Sat, 14 Sep 2002 02:59:19 UTC


The stock smoke tank in the upper wing is 5 gallons. I'm looking at the
original 337 for my S-1T and it has all the details.

As for the weight of the smoke oil. You can get that from its specific
gravity. The canopus-13 data sheet from Texaco shows it's specific gravity
as .85, gasoline is shown on another materials site as having a specific
gravity of about .75. Therefore one can expect smoke oil to be .85/.75  as
heavy as gasoline per unit volume.  So, do you normal gasoline weight
calculations and then multiply by 1.13 and you should be in the ballpark.

After all this work you will find out you were over gross before you even
put a drop of water/gas/smoke oil or anything else in that top tank ;)


	-----Original Message-----
	From:	Fly [SMTP:fly at]
	Sent:	Friday, September 13, 2002 1:44 PM
	To:	acro at
	Subject:	[Acro] S1S aux fuel tank capacity?

	Hi Folks,

	I just weighed a plans-built Pitts S1S that was built in 1979.   It
has the
	aux fuel tank in the upper wing center section but it is being used
as a
	smoke oil tank.     There is no documentation in the records for
this tank.
	The temporary owners don't know.... plus despite my request, they
filled the
	tank instead of draining it.

	It appears to have stock wings.
	Any guesses on the capacity of this tank?
	Also, what does smoke oil weigh?

	In the papers, I saw a 1979 sales brochure for an "Ultimate poly
tank" that
	had a 4 gal capacity.
	It show a center drain.  This S1S had the lines coming down the left
	center strrt.

	Thanks for any help,

	Kent Felkins

	  fly at

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