X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Wed, 05 Sep 2012 12:28:42 -0400 Message-ID: X-Original-Return-Path: Received: from elasmtp-dupuy.atl.sa.earthlink.net ([209.86.89.62] verified) by logan.com (CommuniGate Pro SMTP 6.0c1) with ESMTP id 5745215 for lml@lancaironline.net; Wed, 05 Sep 2012 09:41:51 -0400 Received-SPF: none receiver=logan.com; client-ip=209.86.89.62; envelope-from=colyncase@earthlink.net DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=dk20050327; d=earthlink.net; b=qSlGjIV6tAo5cXZVjyx4J20MxBKR4/jzW0Lf1DxXtsxkpeKU/4s2WoAa1gZaHtcH; h=Received:From:Mime-Version:Content-Type:Subject:Date:In-Reply-To:To:References:Message-Id:X-Mailer:X-ELNK-Trace:X-Originating-IP; Received: from [64.222.104.56] (helo=[192.168.1.24]) by elasmtp-dupuy.atl.sa.earthlink.net with esmtpa (Exim 4.67) (envelope-from ) id 1T9Fr1-00082Y-14 for lml@lancaironline.net; Wed, 05 Sep 2012 09:41:15 -0400 From: Colyn Case Mime-Version: 1.0 (Apple Message framework v1084) Content-Type: multipart/alternative; boundary=Apple-Mail-599--821912663 Subject: Re: [LML] Re: Thermal influence on Hydraulic Pressure X-Original-Date: Wed, 5 Sep 2012 09:41:14 -0400 In-Reply-To: X-Original-To: "Lancair Mailing List" References: X-Original-Message-Id: <413636B2-26A6-4D7D-BCEF-BFA40A19B5E0@earthlink.net> X-Mailer: Apple Mail (2.1084) X-ELNK-Trace: 63d5d3452847f8b1d6dd28457998182d7e972de0d01da940d58d4ed7a718616ce9686993a34952d1350badd9bab72f9c350badd9bab72f9c350badd9bab72f9c X-Originating-IP: 64.222.104.56 --Apple-Mail-599--821912663 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii Wow Fred. I suspect they are effective down to a lower speed than precise-flights = though? Could be useful for spot landings on short final to a hay field? On Sep 4, 2012, at 11:16 PM, Frederick Moreno wrote: Colyn wrote: Tell us more about those hydraulic speed brakes... A flap hydraulic cylinder is mounted cross wise on the back of the main = spar and pushes and pulls a bell crank that pushes and pulls two heavy = duty marine grade push pull cables that then snake out through the = fuselage and out to the speed brakes. The whole assembly sits under the = pilot and copilot seats, and is covered by a molded carbon cover to keep = back seat passenger feet from getting involved. The cylinder is = operated by the same type of valve used for flap actuation. The valve = is located in the center vertical console panel between but below the = gear and flap handles and has its own unique knob. =20 The push pull cables terminate in a four bar linkage in each wing that = serves two purposes. First the horizontal motion of the cable is = converted to vertical motion which pushes the speed brake panels up and = down. The panels are in the conventional position, hinged at the front = with a carbon piano hinge covered with a glider gap seal, and are about = 18 inches wide and 3.5 inches in the flow direction. They move up 45 = degrees,and position can be controlled just like flaps. The four bar = linkage is also configured so that in the down position the panels are = locked down by an over center movement so they can not float up, a = common problem with some Precise-Flight speed brakes in turbulence.=20 =20 Overall they work about the same as the Precise-Flight speed brakes, but = are infinitely adjustable which turns out not to be much of an = advantage. I either put them out or don't. And having a very tight fit = on the top of the wing, there is no leakage of air from inside the wing = out the top of the wing which reduces drag a smidgen. =20 It was a hell of a lot of design and fabrication work to save the price = of Precise-flight brakes (which I never much liked) in favor of a = hydraulic valve, cylinder, and some cables. Not recommended. =20 Fred --Apple-Mail-599--821912663 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=us-ascii Wow Fred.

I suspect they are = effective down to a lower speed than precise-flights = though?
Could be useful for spot landings on short final to a = hay field?

On Sep 4, 2012, at 11:16 PM, = Frederick Moreno wrote:

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