Moose tail: Question on FUS-438

[Ted Waltman]

The FUS-438, now made out of steel, helps to stiffen that entire back
set of "plates" that make up part of the vertical stabilizer attach
point. The new stinger (and the old stinger) simply pass through the
hole in FUS-438...and hopefully never touch the edges of the hole. The
problem that previously existed was that the old stinger was moving (not
flexing) so much that it was impacting the edge of the old FUS-438
"pivot hole" leading to cracks and buckles. In my personal opinion--I'm
not an engineer--I supposed that the new FUS-438 is the least important
of all the new tail upgrades. The new FUS-438, being one solid piece at
the bottom curve, provides a firmer attach point for FUS-422...the tail
wrap. Again, only in my personal opinion, if I were putting everything
together today--and if I had no idea when the new FUS-438 would be
available--I might be inclinded to simply use the old FUS-438. I'm not
saying that's what anyone else should do; I'm just saying that I would
at least consider using the old FUS-438 in this one hypothetical
instance.

Regarding the availability of the new stinger, my speculation is that
Murphy Aircraft are still working on the engineering of the angle at the
rear (swivel) attach point [e.g. considering changing from the prototype
9.5 degrees to perhaps something less than that].

Hope this answers your question Steve.

Ted

-----Original Message-----
From: mike.davis@dcsol.com [mailto:mike.davis@dcsol.com] On Behalf Of
Steve Halvorsen
Sent: Monday, October 31, 2005 8:56 AM
To: rebel-builders@dcsol.com
Subject: Re: Moose tail: further update on testing


Ted:

We have ordered the "BEEF UP" group of parts for our moose from MAM.
Nancy says that the new stinger (LG-066) and the (STEEL) FUS-438 has not
been approved yet for production. We can wait for the stinger for a
while, but will need the 438 to install with the new parts. Is the new
steel 438 a big improvement from the old one? ? ?
Do you think that the old 438 will last with the new stinger? ? ? We
will be working full time on our moose this month and wanted to get it
ALL put together.

Nancy has said there is a lot of interest in these parts, so if anyone
is thinking of doing this retrofit they better get their ordres in NOW
as I think MAM will be running out of parts soon. The more orders MAM
gets for this group of parts the sooner they will start making the new
stingers.

Glad to hear that the beef up looks like it will help in the long run as
a lot of our flying will be into onimproved landing sites. Farm fields
and dirt roads.

Thanks for you insite and installing these MODS to help prove them out.

Steve H
Moose 213


Ted Waltman <tedwaltman@i1ci.com> wrote:
I towed the plane across rough ground and watched the stinger / tail
today. The new stinger design is a HUGE improvement over the old round,
hollow, one. This new stinger flexes significantly more than the
previous design and clearly absorbes a substantial load which the
bulkheads themselves had to previously bear the brunt of.

After nearly 20 landings on rough turf, everything appears as solid as
when first installed. At this stage I'd have to say that the
improvements in component thickness coupled with the new stinger and
additional horizontal stiffeners are a winner on the Moose. When the new
stinger design becomes available from Murphy Aircraft, I highly
encourage every Moose / Super Rebel owner to consider an upgrade
(assuming one does a significant portion of their flying on wheels that
is).

All the details are at
http://www.i1ci.com/Flying/Moose/Tail/TailUpgrade.html




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[Steve Halvorsen]

Thanks for the Quick reply Ted.

E-mailed MAM to see if the had a proto type 438 left over that they could send. Waiting for an answer from them.

Did not realize that the old style stinger HIT the edges of the 438 and thats what caused the problems with it.

We hope to get the entire plane together by the end of Nov. and than do all the wiring and running of fuel lines ect. Want to be in the air in the spring! ! ! !

Steve H
Moose 213


Ted Waltman <tedwaltman@i1ci.com> wrote:
The FUS-438, now made out of steel, helps to stiffen that entire back
set of "plates" that make up part of the vertical stabilizer attach
point. The new stinger (and the old stinger) simply pass through the
hole in FUS-438...and hopefully never touch the edges of the hole. The
problem that previously existed was that the old stinger was moving (not
flexing) so much that it was impacting the edge of the old FUS-438
"pivot hole" leading to cracks and buckles. In my personal opinion--I'm
not an engineer--I supposed that the new FUS-438 is the least important
of all the new tail upgrades. The new FUS-438, being one solid piece at
the bottom curve, provides a firmer attach point for FUS-422...the tail
wrap. Again, only in my personal opinion, if I were putting everything
together today--and if I had no idea when the new FUS-438 would be
available--I might be inclinded to simply use the old FUS-438. I'm not
saying that's what anyone else should do; I'm just saying that I would
at least consider using the old FUS-438 in this one hypothetical
instance.

Regarding the availability of the new stinger, my speculation is that
Murphy Aircraft are still working on the engineering of the angle at the
rear (swivel) attach point [e.g. considering changing from the prototype
9.5 degrees to perhaps something less than that].

Hope this answers your question Steve.

Ted

-----Original Message-----
From: mike.davis@dcsol.com [mailto:mike.davis@dcsol.com] On Behalf Of
Steve Halvorsen
Sent: Monday, October 31, 2005 8:56 AM
To: rebel-builders@dcsol.com
Subject: Re: Moose tail: further update on testing


Ted:

We have ordered the "BEEF UP" group of parts for our moose from MAM.
Nancy says that the new stinger (LG-066) and the (STEEL) FUS-438 has not
been approved yet for production. We can wait for the stinger for a
while, but will need the 438 to install with the new parts. Is the new
steel 438 a big improvement from the old one? ? ?
Do you think that the old 438 will last with the new stinger? ? ? We
will be working full time on our moose this month and wanted to get it
ALL put together.

Nancy has said there is a lot of interest in these parts, so if anyone
is thinking of doing this retrofit they better get their ordres in NOW
as I think MAM will be running out of parts soon. The more orders MAM
gets for this group of parts the sooner they will start making the new
stingers.

Glad to hear that the beef up looks like it will help in the long run as
a lot of our flying will be into onimproved landing sites. Farm fields
and dirt roads.

Thanks for you insite and installing these MODS to help prove them out.

Steve H
Moose 213


Ted Waltman wrote:
I towed the plane across rough ground and watched the stinger / tail
today. The new stinger design is a HUGE improvement over the old round,
hollow, one. This new stinger flexes significantly more than the
previous design and clearly absorbes a substantial load which the
bulkheads themselves had to previously bear the brunt of.

After nearly 20 landings on rough turf, everything appears as solid as
when first installed. At this stage I'd have to say that the
improvements in component thickness coupled with the new stinger and
additional horizontal stiffeners are a winner on the Moose. When the new
stinger design becomes available from Murphy Aircraft, I highly
encourage every Moose / Super Rebel owner to consider an upgrade
(assuming one does a significant portion of their flying on wheels that
is).

All the details are at
http://www.i1ci.com/Flying/Moose/Tail/TailUpgrade.html




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