Return-Path: Sender: (Marvin Kaye) To: lml@lancaironline.net Date: Mon, 14 Jun 2004 18:42:25 -0400 Message-ID: X-Original-Return-Path: Received: from imo-m26.mx.aol.com ([64.12.137.7] verified) by logan.com (CommuniGate Pro SMTP 4.2b5) with ESMTP id 152742 for lml@lancaironline.net; Mon, 14 Jun 2004 18:11:19 -0400 Received: from Sky2high@aol.com by imo-m26.mx.aol.com (mail_out_v37_r2.6.) id q.1f0.2308cded (4254) for ; Mon, 14 Jun 2004 18:10:28 -0400 (EDT) From: Sky2high@aol.com X-Original-Message-ID: <1f0.2308cded.2dff7c54@aol.com> X-Original-Date: Mon, 14 Jun 2004 18:10:28 EDT Subject: Re: [LML] Trim X-Original-To: lml@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1087251028" X-Mailer: 9.0 for Windows sub 5000 -------------------------------1087251028 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit In a message dated 6/14/2004 11:31:05 AM Central Standard Time, artbertolina@earthlink.net writes: I would be interested in other ideas on how to protect against runaway trim Art, In my 320: 1. Elevator: Spring and Dick Reichel Walnutty geared trim wheel system - Run away trim is only a problem should I develop an uncontrollable tic in my trim hand. Of course, flying from low humidity to high results in the wood expanding and the wheel getting awfully hard to move. 2. Rudder: Spring bias/servo operated system - The spring is just strong enough to provide right rudder assist at takeoff and just capable of keeping the ball centered at max cruise, both situations are at the opposite servo stops. My leg (whichever one is required) can easily overcome the spring pressure at a reverse setting (actually flight tested) if, and only if, I remember to look at the ball. A mis-trimmed rudder only induces yaw (usually a yawn) and the A/P (if used) is quite happy to provide the slight bank to overcome my forgetfulness. 3. Aileron: Uh Oh! Also a spring bias/servo operated system (like the Cirrus or Bonanza) - Requires very small servo movement to laterally trim the craft. For safety sake, I used two springs for each direction (as in redundancy). If the servo would run away I should have to hold two or three pounds (English System) in order to counteract this anomaly. Hmmmmmm, maybe I will try just one spring per side thus requiring more servo activity to trim the plane. No, upon second thought, if my equal wing emptying fuel system should hiccup I might actually need more trim to account for wing weight imbalance. If you have trim tabs, perhaps others will have suggestions like make them smaller or provide servo movement limits. Slowing down should lessen the force required to overcome the run away trim tab. Scott Krueger AKA Grayhawk Sky2high@aol.com II-P N92EX IO320 Aurora, IL (KARR) LML, where ideas collide and you decide! -------------------------------1087251028 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

In a message dated 6/14/2004 11:31:05 AM Central Standard Time,=20 artbertolina@earthlink.net writes:

<= FONT=20 style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 size= =3D2>

I would be interested

in other ideas on how to protect against=20= runaway=20 trim

Art,

In my 320:

1. Elevator: Spring and Dick Reichel Walnutty geared trim wh= eel=20 system - Run away trim is only a problem should I develop an uncontrollable=20= tic=20 in my trim hand. Of course, flying from low humidity to high results i= n=20 the wood expanding and the wheel getting awfully hard to move.

2. Rudder: Spring bias/servo operated system - The spring is just stron= g=20 enough to provide right rudder assist at takeoff and just capable of=20 keeping the ball centered at max cruise, both situations are at the opposite= =20 servo stops. My leg (whichever one is required) can easily overcome th= e=20 spring pressure at a reverse setting (actually flight tested) if, and o= nly=20 if, I remember to look at the ball. A mis-trimmed rudder only induces=20= yaw=20 (usually a yawn) and the A/P (if used) is quite happy to provide the sl= ight=20 bank to overcome my forgetfulness.

3. Aileron: Uh Oh! Also a spring bias/servo operated system= =20 (like the Cirrus or Bonanza) - Requires very small servo movement to lateral= ly=20 trim the craft. For safety sake, I used two springs for each direction= (as=20 in redundancy). If the servo would run away I should have to hold two=20= or=20 three pounds (English System) in order to counteract this anomaly. =20 Hmmmmmm, maybe I will try just one spring per side thus requiring more servo= =20 activity to trim the plane. No, upon second thought, if my equal wing=20 emptying fuel system should hiccup I might actually need more trim to accoun= t=20 for wing weight imbalance.

If you have trim tabs, perhaps others will have suggestions like m= ake=20 them smaller or provide servo movement limits. Slowing down should les= sen=20 the force required to overcome the run away trim tab.

Scott Krueger=20 AKA Grayhawk
Sky2high@aol.com
II-P N92EX IO320 Aurora, IL=20 (KARR)

LML, where ideas collide and you=20 decide!

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