X-Virus-Scanned: clean according to Sophos on Logan.com X-SpamCatcher-Score: 2 [X] Return-Path: Sender: To: lml@lancaironline.net Date: Wed, 09 May 2007 12:47:47 -0400 Message-ID: X-Original-Return-Path: Received: from vms046pub.verizon.net ([206.46.252.46] verified) by logan.com (CommuniGate Pro SMTP 5.1.8) with ESMTP id 2034307 for lml@lancaironline.net; Wed, 09 May 2007 12:20:25 -0400 Received: from [192.168.111.2] ([70.19.63.246]) by vms046.mailsrvcs.net (Sun Java System Messaging Server 6.2-6.01 (built Apr 3 2006)) with ESMTPA id <0JHS00LMP81MDUU3@vms046.mailsrvcs.net> for lml@lancaironline.net; Wed, 09 May 2007 11:20:11 -0500 (CDT) X-Original-Date: Wed, 09 May 2007 12:20:08 -0400 From: Kevin Kossi Subject: Re: [LML] Re: IO-550 fuel injection In-reply-to: X-Original-To: "Lancair Mailing List" X-Original-Message-id: MIME-version: 1.0 (Apple Message framework v752.2) X-Mailer: Apple Mail (2.752.2) Content-type: multipart/alternative; boundary=Apple-Mail-29-704429708 References: --Apple-Mail-29-704429708 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed What concerns me about ram air to create positive pressure inside the fuel tanks is the possibility of rain water being rammed along with the air into the tanks. Is there something that seperats the air and water before it is pushed into the tank? Kevin On May 9, 2007, at 11:27 AM, John Huft wrote: > Here is an off-the-wall theory from the RV spy.... > > I am suspicious of those cute little NACA vents you guys use for > tank vents. I am thinking they may not be as effective as they need > to be at higher altitudes (lower indicated airspeeds). I think > maybe NACA vents work better when there is airflow through them, > rather than being used to generate a static pressure. > > I am thinking a good positive pressure inside the tank would reduce > these problems. > > My RV8 has streamlined tank vents that stick out about 1 1/2 inches > into the air stream to get out of the boundary layer and generate a > positive pressure inside the tank. I never turn the boost pump on > except as a precaution on take-off and landing, and I have flown it > for 3 hours at a time at 17,500 msl. I never turn the pump on > switching tanks. > > My IO-550 powered C185 has big ugly tank vent tubes hanging below > the wing (hiding behind the wing struts to keep from icing up). I > have flown for hours at 19,000 IFR and never touched the boost > pump. I have taken off from Porterville, CA at 105 degrees and > climbed to 17,500 eastbound and never touched the boost pump. > > Just a thought, > > John Huft (RV spy) Kevin Kossi Legacy 76% New York Continental IO-550-EXP 10:1 Single Lightspeed Single Slick Mag Hartzell HC-H3YF-2UFX/FC7391D-3X. Full feathering, counterweighted, 3 blade --Apple-Mail-29-704429708 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=ISO-8859-1 What concerns me about ram air = to create positive pressure inside the fuel tanks is the=A0possibility = of rain water being=A0rammed along with the air into the tanks.

Is there something that = seperats the air and water=A0before it is pushed into the tank?


Kevin

On May 9, 2007, at 11:27 AM, John Huft wrote:

Here is an off-the-wall theory from the RV = spy....

I am suspicious of those cute little NACA vents you = guys use for tank vents. I am thinking they may not be as effective as = they need to be at higher altitudes (lower indicated airspeeds). I think = maybe NACA vents work better when there is airflow through them, rather = than being used to generate a static pressure.

I am = thinking a good positive pressure inside the tank would reduce these = problems.

My RV8 has streamlined tank vents that stick out = about 1 1/2 inches into the air stream to get out of the boundary layer = and generate a positive pressure inside the tank. I never turn the boost = pump on except as a precaution on take-off and landing, and I have flown = it for 3 hours at a time at 17,500 msl. I never turn the pump on = switching tanks.

My IO-550 powered C185 has big ugly tank vent tubes = hanging below the wing (hiding behind the wing struts to keep from icing = up). I have flown for hours at 19,000 IFR and never touched the boost = pump. I have taken off from Porterville, CA at 105 degrees and climbed = to 17,500 eastbound and never touched the boost pump.

Just a = thought,

John Huft (RV spy)

=
Kevin = Kossi
Legacy=A076%
New = York=A0
Continental IO-550-EXP
10:1=A0Single = Lightspeed=A0Single Slick Mag
Hartzell=A0 Full feathering, counterweighted, 3 = blade=A0



 =

= --Apple-Mail-29-704429708--