[rebel-builders] Moose/Super Rebel brake issue
Posted: Sun Feb 19, 2012 8:34 pm
Tom,
In brief: The manner in which the brakes are mounted to the floor, in
combination with the design of the right-side brake interconnect bar, can,
if the brake mounts are off just slightly, cause an unrecoverable (in
flight/taxi) pedal lock up. Full L or full R rudder coupled with full brake
can cause the brake linkage to go over-center, thereby locking the pedals
up. Several builders have experienced this while taxiing and were able to
stop and, using a tool (e.g. long screwdriver, pry bar) unlock the pedal.
One builder with approx 60 hours on his plane ground-looped it on
landing/takeoff (can't remember which) resulting in totaling the plane and
having the gear leg break off and come up thru the floor severely cutting
the pilot's leg.
This is a SERIOUS issue. If you don't have dual master/slave cylinders or
some other mod then I strongly recommend you take off the right-side brake
interconnect bar. Immediately.
Pictures are available amongst various builders. Perhaps Murphy is working
on a service bulletin? Anyone know?
Ted
-----Original Message-----
From: mike.davis@dcsol.com [mailto:mike.davis@dcsol.com] On Behalf Of
thtonner@mymts.net
Sent: Monday, January 10, 2011 7:28 PM
To: Murphy Mailing list
Subject: RE: [rebel-builders] Moose engine choice
Can anyone share a little more information on the right side brake safety
concern. I own a SR2500. this is the first I heard of it and would like to
know what the issue is, how to resolve, etc.
Thanks,
Tom Tonner
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In brief: The manner in which the brakes are mounted to the floor, in
combination with the design of the right-side brake interconnect bar, can,
if the brake mounts are off just slightly, cause an unrecoverable (in
flight/taxi) pedal lock up. Full L or full R rudder coupled with full brake
can cause the brake linkage to go over-center, thereby locking the pedals
up. Several builders have experienced this while taxiing and were able to
stop and, using a tool (e.g. long screwdriver, pry bar) unlock the pedal.
One builder with approx 60 hours on his plane ground-looped it on
landing/takeoff (can't remember which) resulting in totaling the plane and
having the gear leg break off and come up thru the floor severely cutting
the pilot's leg.
This is a SERIOUS issue. If you don't have dual master/slave cylinders or
some other mod then I strongly recommend you take off the right-side brake
interconnect bar. Immediately.
Pictures are available amongst various builders. Perhaps Murphy is working
on a service bulletin? Anyone know?
Ted
-----Original Message-----
From: mike.davis@dcsol.com [mailto:mike.davis@dcsol.com] On Behalf Of
thtonner@mymts.net
Sent: Monday, January 10, 2011 7:28 PM
To: Murphy Mailing list
Subject: RE: [rebel-builders] Moose engine choice
Can anyone share a little more information on the right side brake safety
concern. I own a SR2500. this is the first I heard of it and would like to
know what the issue is, how to resolve, etc.
Thanks,
Tom Tonner
area.From: ted@vafm.org
To: rebel-builders@dcsol.com
Subject: RE: [rebel-builders] Moose engine choice
Date: Sun, 9 Jan 2011 10:15:47 -0700
Hello Rick,
I have 400+ hours on an M-14P Moose operating at 5,000' in the Denver
expensiveNo problems with gross weight takeoffs even on very warm days. Cruise is
120 mph at 15.5gph. Anyone that advertises faster cruise than that is full
of !@#@%. I've flown side-by-side with another Moose w/ M-14 and confirmed
speed/gph. Climb perf is about 600 to 800 fpm at medium weight on maybe 60
to 70 degree day at my altitude. I've had it up to 16,500' several times
and it's still able to climb.
O-540's are definitely faster by far.
M-14P's are sexy engines. Parts are easy to get and far, FAR less
brakesthan O-540. One can get an M-14P (overhauled one) for low $20k and new one
for $25K+ if you look around. To my knowledge, O-540's are way more
expensive than that.
MAM never released a service bulletin on the huge safety problem of the
right-brake interconnect. Go figure. I just took my interconnect bar
off/out. Other builders have done a variety of mods to enable right-side
brakes (Cessna mod, custom, etc). I don't miss not having right-side
orat all.
Ted
-----Original Message-----
From: mike.davis@dcsol.com [mailto:mike.davis@dcsol.com] On Behalf Of Rick
Byers
Sent: Sunday, January 09, 2011 5:35 AM
To: Rebel Builders Group
Subject: [rebel-builders] Moose engine choice
Hi All,
I'm new to the email group. I started a Super Rebel a few years ago,
purchased the Moose Upgrade and had some down time from the building
process. Plan to start up again soon and am still undecided on the M14-P
willO-540 engine.
MAM has told me that I can complete the fuselage and that the Firewall
andbe built the same up to the engine mounting.
I was hoping to get some feedback from anyone flying Moose with O-540's
theM14's on the pros and cons of each. I've read about the peculiarities of
4780M14 series engines as far as how they differ from the Opposed Engines for
ground operations. I guess what I'm looking for is the actual performance
numbers: Rate of climb, cruise speed, fuel burn. I've seen the advertised
numbers but was just looking for some confirmation.
I currently fly a C-120 out of Bisbee, AZ where the field elevation is
up.ft. and it's not uncommon to have density altitudes over 8000 ft. in the
warm months. Some days I'm lucky to see 100 fpm climb rate. This is where
I'm wondering about the O-540 with a gross wt airplane.
I've read about a Moose accident where a brake over centered and locked
MAM hasn't responded to my question on that subject yet. Saw some posts by
builders who didn't install the RH side brake mechanism. Is it standard
practice to not install the right seat slave hardware?
Thank you.
Any answers & help is greatly appreciated.
Rick Byers
Hereford, AZ
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