X-Virus-Scanned: clean according to Sophos on Logan.com X-SpamCatcher-Score: 2 [X] Return-Path: Sender: To: lml@lancaironline.net Date: Tue, 13 Mar 2007 11:46:09 -0400 Message-ID: X-Original-Return-Path: Received: from mta9.adelphia.net ([68.168.78.199] verified) by logan.com (CommuniGate Pro SMTP 5.1.7) with ESMTP id 1918530 for lml@lancaironline.net; Tue, 13 Mar 2007 09:47:50 -0400 Received-SPF: pass receiver=logan.com; client-ip=68.168.78.199; envelope-from=glcasey@adelphia.net Received: from [75.82.254.207] by mta9.adelphia.net (InterMail vM.6.01.05.02 201-2131-123-102-20050715) with ESMTP id <20070313134700.IRVV2196.mta9.adelphia.net@[75.82.254.207]> for ; Tue, 13 Mar 2007 09:47:00 -0400 Mime-Version: 1.0 (Apple Message framework v752.2) In-Reply-To: References: Content-Type: multipart/alternative; boundary=Apple-Mail-2-65408320 X-Original-Message-Id: <77440D7E-B24C-4A35-A184-F94A737BB3F3@adelphia.net> From: Gary Casey Subject: Re: Infinity Grip X-Original-Date: Tue, 13 Mar 2007 06:47:00 -0700 X-Original-To: Lancair Mailing List X-Mailer: Apple Mail (2.752.2) --Apple-Mail-2-65408320 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed I think I didn't explain my concept very well, judging from the reply below. Picture two miniature toggle switches mounted side-by-side against each other. The toggles are so close together you can easily move both together - in fact it would be difficult to move one without moving the other. Then put nicely-shaped knobs on the end of the toggles and it even looks like a singe knob, but split down the center. This is the system used by most certified systems, including all the S-TEC autopilots I've seen in light aircraft as well as in heavier iron, as Skip mentioned, and of which someone posted a picture. What I'm proposing is instead of using center-off double- throw switches, use single-throw switches. Of course you could only trim in one direction. Then install another pair on the front of the stick that actuates the trim in the other direction. One pair of switches in the rear of the stick, actuated with a downward motion, produces nose-up trim while another pair of switches mounted in the front of the stick, also actuated with a downward motion, produces nose-down trim. Could also be pushbuttons, I suppose. 2 pairs of switches, 4 total. The intent is to use the digits that are "unloaded" and available - your thumb when pulling back on the stick and your index finger when pushing forward. Failure Modes and Effects Analysis (DFMEA): One switch sticks on - no effect until pilot trims in the opposite direction, then the breaker pops. Both switches of a pair stick on - trim keeps running until trim in the opposite direction is activated by the pilot (independent switches, remember?), when the breaker pops. Any switch that fails open results in no trim motion in that direction, but no popped breaker. The switches in the other stick could then be used without problem. Only problem is that a shorted switch could not be disabled without a right-left selector switch in the system. Maybe that should be added. Gary Casey ES N224SG > > "...double switch for pitch trim..." > > Gary & Skip, > > I'm having a problem visualizing this double switch thing. How can > you acticvate both switches at the same time with the same digit if > switches are on opposites sides of the grip? > > Also, if the up and down activation occurs at the same time, > doesn't that mean NOTHING happens? > > > JHK --Apple-Mail-2-65408320 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=ISO-8859-1 I think I didn't explain my = concept very well, judging from the reply below.=A0 Picture two = miniature toggle switches mounted side-by-side against each other.=A0 = The toggles are so close together you can easily move both together - in = fact it would be difficult to move one without moving the other.=A0 Then = put nicely-shaped knobs on the end of the toggles and it even looks like = a singe knob, but split down the center.=A0 This is the system used by = most certified systems, including all the S-TEC autopilots I've seen in = light aircraft as well as in heavier iron, as Skip mentioned, and of = which someone posted a picture.=A0 What I'm proposing is instead of = using center-off double-throw switches, use single-throw switches.=A0 Of = course you could only trim in one direction.=A0 Then install another = pair on the front of the stick that actuates the trim in the other = direction.=A0 One pair of switches in the rear of the stick, actuated = with a downward motion, produces nose-up trim while another pair of = switches mounted in the front of the stick, also actuated with a = downward motion, produces nose-down trim.=A0 Could also be pushbuttons, = I suppose.=A0 2=A0pairs of switches, 4 total.=A0 The intent is to use = the digits that are "unloaded" and available - your thumb when pulling = back on the stick and your index finger when pushing forward.

Failure Modes and Effects = Analysis (DFMEA):=A0 One switch sticks on - no effect until pilot trims = in the opposite direction, then the breaker pops.=A0 Both switches of a = pair stick on - trim keeps running until trim in the opposite direction = is activated by the pilot (independent switches, remember?), when the = breaker pops.=A0 Any switch that fails open results in no trim motion in = that direction, but no popped breaker.=A0 The switches in the other = stick could then be used without problem.=A0 Only problem is that a = shorted switch could not be disabled without a right-left selector = switch in the system.=A0 Maybe that should be added.

Gary Casey
ES = N224SG

"...double switch for = pitch trim..."
=A0
Gary & Skip,
=A0
I'm = having a problem visualizing this double switch thing.=A0 How can you = acticvate both switches at the same time with the same digit if switches = are on opposites sides of the grip?
=A0
Also, = if the up and down activation occurs at the same time, doesn't that mean = NOTHING happens?
=A0
=A0
JHK

= --Apple-Mail-2-65408320--