The Murphy Builders Site

Posted: **Sat Feb 18, 2012 8:55 am**

Must be a different airplane entirely as Ron's is flyable with the trim to
either extreme. The elevator is rigged for more up and more down than the
book also but we already covered this one. Definitely need a pull type
breaker handy though.
Al have you tried it in yours?
Steve Rhodes
Moose 173

----- Original Message -----
From: "Warren Montgomery" <monty@emirates.net.ae>
To: <murphy-rebel@dcsol.com>
Sent: Tuesday, January 27, 2004 04:19
Subject: Runaway Trim Forces

Bob,

Are you saying that with full runaway trim you can't override with

elevator.

This would not be a failure tolerant system.
Warren

Bob Patterson wrote:

When choosing your button layout, make sure it's difficult to push
the trim by accident - more than a few exciting moments on short final
when the trim was pushed instead of press-to-talk !! Also, it would be
a good idea to have a separate pull-type breaker in an easy-to-reach
spot on the left side panel, for the trim motor - if it ever runs away in
the Moose, there's NO way you could hold it with the stick !!!
(only had ONE good scare - but that's one too many !)

.....bobp

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Posted: **Sat Feb 18, 2012 8:55 am**

Steve,
I have not done a specific test but have taken off with the wrong trim
setting. The controls get heavy but not over powering.
I have the trim (elevator and rudder) and autopilot on the same circuit with
a switch breaker, works as the kill switch.
Al
----- Original Message -----
From: "Rhodes" <RHODES5@GCI.NET>
To: <murphy-rebel@dcsol.com>
Sent: Tuesday, January 27, 2004 8:07 AM
Subject: Re: Runaway Trim Forces

Must be a different airplane entirely as Ron's is flyable with the trim to
either extreme. The elevator is rigged for more up and more down than the
book also but we already covered this one. Definitely need a pull type
breaker handy though.
Al have you tried it in yours?
Steve Rhodes
Moose 173

----- Original Message -----
From: "Warren Montgomery" <monty@emirates.net.ae>
To: <murphy-rebel@dcsol.com>
Sent: Tuesday, January 27, 2004 04:19
Subject: Runaway Trim Forces

Bob,

Are you saying that with full runaway trim you can't override with
elevator.
This would not be a failure tolerant system.
Warren

Bob Patterson wrote:

When choosing your button layout, make sure it's difficult to push
the trim by accident - more than a few exciting moments on short final
when the trim was pushed instead of press-to-talk !! Also, it would

be

a good idea to have a separate pull-type breaker in an easy-to-reach
spot on the left side panel, for the trim motor - if it ever runs away

in

the Moose, there's NO way you could hold it with the stick !!!
(only had ONE good scare - but that's one too many !)

.....bobp

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Posted: **Sat Feb 18, 2012 8:55 am**

Yeah. Kinda got my attention, too!

Bill

----- Original Message -----
From: "Warren Montgomery" <monty@emirates.net.ae>
To: <murphy-rebel@dcsol.com>
Sent: Tuesday, January 27, 2004 7:19 AM
Subject: Runaway Trim Forces

Bob,

Are you saying that with full runaway trim you can't override with

elevator.

This would not be a failure tolerant system.
Warren

Bob Patterson wrote:

When choosing your button layout, make sure it's difficult to push
the trim by accident - more than a few exciting moments on short final
when the trim was pushed instead of press-to-talk !! Also, it would be
a good idea to have a separate pull-type breaker in an easy-to-reach
spot on the left side panel, for the trim motor - if it ever runs away in
the Moose, there's NO way you could hold it with the stick !!!
(only had ONE good scare - but that's one too many !)

.....bobp

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Posted: **Sat Feb 18, 2012 8:55 am**

Hi Warren !

That was the caution I was given .... and it applied to ALL of
the factory Supers and the Moose. Just passing it along, and I'm glad
to hear that most builders are incorporating some kind of easily-
accessible 'kill' switch or pull-out circuit breaker. Just don't
hesitate to pull it if in doubt - you won't have long !!

While I didn't try to fly any of them with full trim deflection,
I can imagine that you wouldn't be able to hold it off for very long if
it did go to full travel - that's a very powerful trim.

Also, be careful about button layout on the stick - there were
a few exciting moments when trim was hit instead of mike PTT on short
final - also when the right-seat pilot hit it accidentally with a camera !
I would never suggest putting the trim tab on the stick for ANY
Murphy kit except the SR/Moose - it certainly is NOT needed there
for the Rebel, as the trim is very seldom ever changed !!

This is just a heads-up - I have not personally ever heard of
one of the MAC servos going runaway - but, it <could> happen !

.....bobp

----------------------------orig.-------------------
On Tuesday 27 January 2004 08:19 am, you wrote:

Bob,

Are you saying that with full runaway trim you can't override with elevator.
This would not be a failure tolerant system.
Warren

Bob Patterson wrote:

When choosing your button layout, make sure it's difficult to push
the trim by accident - more than a few exciting moments on short final
when the trim was pushed instead of press-to-talk !! Also, it would be
a good idea to have a separate pull-type breaker in an easy-to-reach
spot on the left side panel, for the trim motor - if it ever runs away in
the Moose, there's NO way you could hold it with the stick !!!
(only had ONE good scare - but that's one too many !)

.....bobp

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Posted: **Sat Feb 18, 2012 8:55 am**

Bob,

Are you saying that with full runaway trim you can't override with elevator.
This would not be a failure tolerant system.
Warren

Bob Patterson wrote:

When choosing your button layout, make sure it's difficult to push
the trim by accident - more than a few exciting moments on short final
when the trim was pushed instead of press-to-talk !! Also, it would be
a good idea to have a separate pull-type breaker in an easy-to-reach
spot on the left side panel, for the trim motor - if it ever runs away in
the Moose, there's NO way you could hold it with the stick !!!
(only had ONE good scare - but that's one too many !)

.....bobp

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