X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Mon, 05 May 2014 17:12:20 -0400 Message-ID: X-Original-Return-Path: Received: from vms173005pub.verizon.net ([206.46.173.5] verified) by logan.com (CommuniGate Pro SMTP 6.0.9e) with ESMTP id 6859905 for lml@lancaironline.net; Mon, 05 May 2014 16:07:19 -0400 Received-SPF: pass receiver=logan.com; client-ip=206.46.173.5; envelope-from=n5zq@verizon.net Received: from BillHP ([unknown] [173.72.169.218]) by vms173005.mailsrvcs.net (Sun Java(tm) System Messaging Server 7u2-7.02 32bit (built Apr 16 2009)) with ESMTPA id <0N5400CXFAIRNL60@vms173005.mailsrvcs.net> for lml@lancaironline.net; Mon, 05 May 2014 15:06:28 -0500 (CDT) X-Original-Message-id: <9A6B117CCC8C4764A0BAC8AACB64E473@BillHP> From: "Bill Harrelson" X-Original-To: "Lancair Mailing List" References: In-reply-to: Subject: Re: [LML] [LNC2] Fast taxi testing X-Original-Date: Mon, 05 May 2014 16:06:06 -0400 MIME-version: 1.0 Content-type: multipart/alternative; boundary="----=_NextPart_000_006C_01CF687B.EBCB5070" X-Priority: 3 X-MSMail-priority: Normal Importance: Normal X-Mailer: Microsoft Windows Live Mail 15.4.3538.513 X-MIMEOLE: Produced By Microsoft MimeOLE V15.4.3538.513 This is a multi-part message in MIME format. ------=_NextPart_000_006C_01CF687B.EBCB5070 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable John, No it=E2=80=99s not normal behavior for these AIRFRAMES. It is, however, = not at all unusual behavior for a new Lancair PILOT. You mentioned that = the second attempt showed an improvement. My totally uninformed, no = data, guess is that it had nothing to do with the added fuel. The third = attempt will probably be better still. It simply takes some getting used = to. One hint: once you=E2=80=99ve accelerated past about running speed = keep your feet off the brakes. There=E2=80=99s plenty of rudder control = available with full power and just a little speed. Trying to steer with = brakes at speeds above 10-15 knots generally results in the behavior = that you described.=20 I don=E2=80=99t know what your experience with Lancairs is but if you = haven=E2=80=99t flown one before PLEASE get some guidance/instruction = from an experienced 235/320/360 pilot or instructor. As you all have = heard me say a million times, these airplanes are not difficult to fly = but they are different. Different enough that even extremely skilled and = highly experienced pilots need Lancair specific training.=20 Bill Harrelson N6ZQ IV 550 hrs formerly N5ZQ 320 2,200 hrs From: John Cooper=20 Sent: Monday, May 05, 2014 7:17 AM To: Lancair Mailing List=20 Subject: [LML] [LNC2] Fast taxi testing This morning I made several fast-taxi runs in my Lanciar 235/O-290-D2. = The first few runs were with empty wing tanks and it got real squirrely. = The plane would veer from side-to-side with a period of about 3 seconds = and it was all I could do to keep it on the runway. I got scared at = about 50 KTs, pulled the power, and applied the brakes heavily to keep = from going into the weeds. I never could get going fast enough to lift = the nose wheel. I taxied back to the hangar and added 5 gallons of 100LL in each wing = tank and repeated the test. The results were much better but the = side-to-side oscillation was still there and it was easy to get into a = P.I.O. Is this normal behavior for the small Lancairs? Could this be due to = something in the oleo strut? (I don't have the centering mod)...Tire = pressure?...Dragging MLG brake?...Any other ideas? FWIW, I added a 5" ventral fin and extended the rudder 5" to avoid just = this sort of thing with the larger engine. Apparently, those mods don't = work at low speeds. Help! ------=_NextPart_000_006C_01CF687B.EBCB5070 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
John,
 
No it=E2=80=99s not normal behavior for = these AIRFRAMES.=20 It is, however, not at all unusual behavior for a new Lancair PILOT. You = mentioned that the second attempt showed an improvement. My totally = uninformed,=20 no data, guess is that it had nothing to do with the added fuel. The = third=20 attempt will probably be better still. It simply takes some getting used = to. One=20 hint: once you=E2=80=99ve accelerated past about running speed keep your = feet off the=20 brakes. There=E2=80=99s plenty of rudder control available with full = power and just a=20 little speed. Trying to steer with brakes at speeds above 10-15 knots = generally=20 results in the behavior that you described.
 
I don=E2=80=99t know what your = experience with Lancairs=20 is but if you haven=E2=80=99t flown one before PLEASE get some = guidance/instruction from=20 an experienced 235/320/360 pilot or instructor. As you all have heard me = say a=20 million times, these airplanes are not difficult to fly but they are = different.=20 Different enough that even extremely skilled and highly experienced = pilots need=20 Lancair specific training.
 
Bill Harrelson
N6ZQ IV 550 hrs
formerly N5ZQ  320   2,200 hrs
 
 
 
 
Sent: Monday, May 05, 2014 7:17 AM
Subject: [LML] [LNC2] Fast taxi testing
 
This=20 morning I made several fast-taxi runs in my Lanciar 235/O-290-D2. The = first few=20 runs were with empty wing tanks and it got real squirrely. The plane = would veer=20 from side-to-side with a period of about 3 seconds and it was all I = could do to=20 keep it on the runway. I got scared at about 50 KTs, pulled the power, = and=20 applied the brakes heavily to keep from going into the weeds. I never = could get=20 going fast enough to lift the nose wheel.

I taxied back to the = hangar and=20 added 5 gallons of 100LL in each wing tank and repeated the test. The = results=20 were much better but the side-to-side oscillation was still there and it = was=20 easy to get into a P.I.O.

Is this normal behavior for the small = Lancairs?=20 Could this be due to something in the oleo strut? (I don't have the = centering=20 mod)...Tire pressure?...Dragging  MLG brake?...Any other=20 ideas?

FWIW, I added a 5" ventral fin and extended the rudder 5" = to avoid=20 just this sort of thing with the larger engine. Apparently, those mods = don't=20 work at low speeds.

Help!
------=_NextPart_000_006C_01CF687B.EBCB5070--