X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from zproxy.gmail.com ([64.233.162.200] verified) by logan.com (CommuniGate Pro SMTP 5.0c2) with ESMTP id 720898 for flyrotary@lancaironline.net; Tue, 13 Sep 2005 17:25:26 -0400 Received-SPF: pass receiver=logan.com; client-ip=64.233.162.200; envelope-from=wdleonard@gmail.com Received: by zproxy.gmail.com with SMTP id p8so22054nzb for ; Tue, 13 Sep 2005 14:24:41 -0700 (PDT) DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=beta; d=gmail.com; h=received:message-id:date:from:reply-to:to:subject:in-reply-to:mime-version:content-type:references; b=kAqcjVE+5+8EM3nvxSrOJh14xFM51Xfnzu1ry9z8gRVUOdhcDTDW2gFD0A2/y+vF4FcdwpXMdapeElRnO/Jy53GVA/zh4fnH5HVYhLKx0YhpLRu0y+QBbq9SL2csswaJdbnjCJrt+5pytLLduh/nwPBfGehWqVl2vhe323hgkiM= Received: by 10.36.9.2 with SMTP id 2mr173441nzi; Tue, 13 Sep 2005 14:24:41 -0700 (PDT) Received: by 10.36.8.13 with HTTP; Tue, 13 Sep 2005 14:24:41 -0700 (PDT) Message-ID: <1c23473f05091314246abe5a4@mail.gmail.com> Date: Tue, 13 Sep 2005 14:24:41 -0700 From: David Leonard Reply-To: wdleonard@gmail.com To: Rotary motors in aircraft Subject: Re: [FlyRotary] New Subject... Vapor pressure changes with premix oil In-Reply-To: Mime-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_Part_22222_26525775.1126646681702" References: ------=_Part_22222_26525775.1126646681702 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Content-Disposition: inline Vapor pressure (pressure at which fuel prefers to be gas instead of liquid)= =20 will be essentially unchanged by the addition of 2-stroke oil.=20 However. With our high pressure, high flow systems the chance of vapor loc= k=20 is basically zero. Proper design would include 1) pumps that are low and=20 close to the tank 2) returning the fuel to a main tank or a large header=20 tank. That's it!... With that set-up we can use winter blend auto fuel from= =20 the highest airports on the hottest days with prolonged ground runs and=20 still have zero risk of vapor lock. The typical rotary installation will have zero risk of carb ice as well. Those two problems account for a large percentage of GA accidents and also= =20 probably many of the accidents that have "unknown" causes. That us really cool!=20 --=20 Dave Leonard Turbo Rotary RV-6 N4VY http://members.aol.com/_ht_a/rotaryroster/index.html http://members.aol.com/_ht_a/vp4skydoc/index.html=20 On 9/12/05, Bobby J. Hughes wrote:=20 >=20 > Anyone have any data as to what affect mixing two stroke oil with auto=20 > fuel does to vapor pressure? Will it make auto fuel more tolerant at high= er=20 > altitudes or less? > Bobby > ------=_Part_22222_26525775.1126646681702 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Content-Disposition: inline
Vapor pressure (pressure at which fuel prefers to be gas instead of li= quid) will be essentially unchanged by the addition of 2-stroke oil.  =
 
However.  With our high pressure, high flow systems the chance of= vapor lock is basically zero.  Proper design would include 1) pu= mps that are low and close to the tank 2) returning the fuel to a main tank= or a large header tank.  That's it!...   With that set-up w= e can use winter blend auto fuel from the highest airports on the hottest d= ays with prolonged ground runs and still have zero risk of vapor lock.
 
The typical rotary installation will have zero risk of carb ice as wel= l.
 
Those two problems account for a large percentage of GA accidents and = also probably many of the accidents that have "unknown" causes.
That us really cool! 
On 9/12/05, = Bobby J. Hughes <bhughes@qnsi.ne= t> wrote:
Anyone have any data as to what = affect mixing two stroke oil with auto fuel does to vapor pressure? Will&nb= sp;it make auto fuel more tolerant at higher altitudes or less?
 
Bobby
 
 


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