REFLECTOR: Elevator trim problem
nmflyer1 at aol.com
nmflyer1 at aol.com
Mon Jan 16 00:02:28 CST 2012
I talked with the Mac folks and was assured that the switches could handle the loads in the velocity. If they didn't, they would replace them. Simple enough.
Kurt
-----Original Message-----
From: Burrall L Sanders <craftsman at freeflightcomposites.com>
To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
Sent: Sun, Jan 15, 2012 3:26 pm
Subject: Re: REFLECTOR: Elevator trim problem
John,
My main concern would be if your switches in the Mac stick are built and rated for the current that the trim motor demands to do its job. Usually the switches are too light for the job...thus the need of a relay.
A switch that is overloaded with current can weld to the closed position and you could have a runaway trim as a result that could go to the stops. Be very careful because the fact that it worked a time or two should not give you the warm and fuzzies yet.
Burrall
www.freeflightcomposites.com
From: John Dibble
Sent: Sunday, January 15, 2012 3:45 PM
To: Velocity Aircraft Owners and Builders list
Subject: Re: REFLECTOR: Elevator trim problem
I eliminated the solid state relay and wired the stick buttons directly to the trim motor. Took 2 short flights today and it worked perfect. I know that's not much time, but on the previous flight it began trimming up by itself right after leveling off at 1000 ft, so I'm cautiously optimistic. If anyone, not using a relay with a Mac stick, has had problems, I'd really like to hear from you.
Thanks,
John
John Dibble wrote:
I'm seriously thinking about that. Maybe with an additional switch to switch between the stick buttons and the toggle so I can keep the stick controls which work most of the time.
John
Douglas Holub wrote:
All arguments for a single DPDT (on) off (on) toggle switch on the panel for elevator trim, on the left side where it's easy to reach with the left hand. Only one robust component.
----- Original Message -----
From:Michael Watson
To: Velocity Aircraft Owners and Builders list
Sent: Thursday, January 12, 2012 12:29 PM
Subject: Re: REFLECTOR: Elevator trim problem
John,
I also have a Mac 7 stick. Last year I had a problem with an intermittent up button.
I called Mac and they sent me two new buttons to replace the up and down ones.
No problems since. I think your up button may be sticking. Unscrew the two screws
under the head four or five turns, twist the head left to right while pressing the up button
and see if it sticks. Find a position that it moves up and down smoothly then tighten the
screws.
On Thu, Jan 12, 2012 at 10:15 AM, John Dibble <aminetech at bluefrog.com> wrote:
While we're on this subject, I need help with an issue with my elevator
trim. Over the past 100 hours, infrequently it seems to trim up
uncommanded. I push forward on the stick to keep level and push the
trim down button. For a second or two nothing happens. Then it
responds properly. I know if I press both buttons at once, nothing
happens, so I'm guessing that there is still an up input in the second
or two when nothing happens. I have a solid state relay that failed
once. In that case the output voltage reduced to where the motor
wouldn't run. I have a Mac 7 stick. On the ground the buttons operate
well with no sign of sticking. I have several questions.
Where is the mechanism that prevents operation when both buttons are
pressed? In the stick? In the relay? In the motor?
Can I eliminate the relay and run full current through the stick?
I may wire lights to the leads going to the motor so I can confirm when
current is being sent to the motor.
Thanks,
John
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--
Mike W.
1997 Velocity Elite RG
Franklin /IVO Electric CS
Dual GRT EFIS HX Synthetic Vision
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