[rebel-builders] Hole distance: Super rebel/Moose tailwheel stinger
Posted: Sun Feb 19, 2012 8:07 pm
FYI, I think the AK Bushwheel uses AN-5 bolts whereas MAM uses an AN-4
bolts.
-----Original Message-----
From: mike.davis@dcsol.com [mailto:mike.davis@dcsol.com] On Behalf Of
Eduardo Gutierrez Sosa
Sent: Tuesday, November 30, 2010 8:22 AM
To: rebel-builders@dcsol.com
Subject: RE: [rebel-builders] Hole distance: Super rebel/Moose tailwheel
stinger
Hi Ted: The use of an oversized press fit pin into the 3/16" hole on the
stinger and the re-drill to 1/4" is the way to go; this will assure you the
new center is true, which must be 1/16" off center to the original Murphy
stinger's hole, plus there will be a 1/32" thick sliver left over in the
original hole, now made to 1/4" diameter; this sliver will have to stay
there, but it may also be removed and there will be no harm done. The system
will be very strong enough anyway; there is another 1/4" bolt holding the
new Alaskan Bushwheel setup. There should be no welding done as this may
disrupt the stinger's heat treatment; you don't want a broken stinger during
landing, the results may be catastrophic. Have a great day, regards, Eduardo
-----Mensaje original-----
De: mike.davis@dcsol.com [mailto:mike.davis@dcsol.com] En nombre de Ted
Waltman
Enviado el: lunes, 29 de noviembre de 2010 06:30 p.m.
Para: rebel-builders@dcsol.com
Asunto: [rebel-builders] Hole distance: Super rebel/Moose tailwheel stinger
Eduardo & Wayne,
The issue is the end of the stinger center-to-center hole distance, not the
individual hole size. The current center-to-center distance is 1 3/16"
which needs to be 1 1/4" to mount an AK Bushwheel or Scott tailwheel
assembly on the MAM stinger.
I traded emails with Dale Fultz who says his machinist can drill one hole
1/16" to one side, if I recall Dale's comments correctly. My machinist
buddy says that can't be done since the drill will want to walk--the drill
won't just cut on the one side.
Another A&P friend suggested putting a pressed (1 thousands oversize) pin in
and then drilling a new hole from scratch. Another machinist friend (a
friend with a milling machine--not a machinist business) suggested perhaps
welding the existing hole then redrilling from scratch.
I'm not a machinist nor am I a metallurgist, so I can't recommend any
solution with any definitive knowledge. I'd suggest one talk to local
machinist shop experts and get their advice.
As a side note, I can't for the life of me understand why MAM went with 1
3/16" since I have yet to see any vendor with anything other than 1 1/4"
center-to-center on their tailwheels.
Ted
-----Original Message-----
From: mike.davis@dcsol.com [mailto:mike.davis@dcsol.com] On Behalf Of Wayne
G. O'Shea
Sent: Monday, November 29, 2010 2:32 PM
To: rebel-builders@dcsol.com
Subject: Re: [rebel-builders] Super rebel/Moose tailwheel stinger
I'm at a loss then why you'd fill them at all if MAM's uses 3/16th and AWB's
uses 1/4" bolts. Use a mill and bring the holes up to 1/4" referencing off
the edges of the existing holes that face each other. There is a 1" distance
between these hole edges for either tailwheel then if MAM's spacing is 1
3/16ths and AWB is 1 1/4" !
----- Original Message -----
From: "Eduardo Gutierrez Sosa" <lopeco.eduardo@gmail.com>
To: <rebel-builders@dcsol.com>
Sent: Monday, November 29, 2010 4:20 PM
Subject: RE: [rebel-builders] Super rebel/Moose tailwheel stinger
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bolts.
-----Original Message-----
From: mike.davis@dcsol.com [mailto:mike.davis@dcsol.com] On Behalf Of
Eduardo Gutierrez Sosa
Sent: Tuesday, November 30, 2010 8:22 AM
To: rebel-builders@dcsol.com
Subject: RE: [rebel-builders] Hole distance: Super rebel/Moose tailwheel
stinger
Hi Ted: The use of an oversized press fit pin into the 3/16" hole on the
stinger and the re-drill to 1/4" is the way to go; this will assure you the
new center is true, which must be 1/16" off center to the original Murphy
stinger's hole, plus there will be a 1/32" thick sliver left over in the
original hole, now made to 1/4" diameter; this sliver will have to stay
there, but it may also be removed and there will be no harm done. The system
will be very strong enough anyway; there is another 1/4" bolt holding the
new Alaskan Bushwheel setup. There should be no welding done as this may
disrupt the stinger's heat treatment; you don't want a broken stinger during
landing, the results may be catastrophic. Have a great day, regards, Eduardo
-----Mensaje original-----
De: mike.davis@dcsol.com [mailto:mike.davis@dcsol.com] En nombre de Ted
Waltman
Enviado el: lunes, 29 de noviembre de 2010 06:30 p.m.
Para: rebel-builders@dcsol.com
Asunto: [rebel-builders] Hole distance: Super rebel/Moose tailwheel stinger
Eduardo & Wayne,
The issue is the end of the stinger center-to-center hole distance, not the
individual hole size. The current center-to-center distance is 1 3/16"
which needs to be 1 1/4" to mount an AK Bushwheel or Scott tailwheel
assembly on the MAM stinger.
I traded emails with Dale Fultz who says his machinist can drill one hole
1/16" to one side, if I recall Dale's comments correctly. My machinist
buddy says that can't be done since the drill will want to walk--the drill
won't just cut on the one side.
Another A&P friend suggested putting a pressed (1 thousands oversize) pin in
and then drilling a new hole from scratch. Another machinist friend (a
friend with a milling machine--not a machinist business) suggested perhaps
welding the existing hole then redrilling from scratch.
I'm not a machinist nor am I a metallurgist, so I can't recommend any
solution with any definitive knowledge. I'd suggest one talk to local
machinist shop experts and get their advice.
As a side note, I can't for the life of me understand why MAM went with 1
3/16" since I have yet to see any vendor with anything other than 1 1/4"
center-to-center on their tailwheels.
Ted
-----Original Message-----
From: mike.davis@dcsol.com [mailto:mike.davis@dcsol.com] On Behalf Of Wayne
G. O'Shea
Sent: Monday, November 29, 2010 2:32 PM
To: rebel-builders@dcsol.com
Subject: Re: [rebel-builders] Super rebel/Moose tailwheel stinger
I'm at a loss then why you'd fill them at all if MAM's uses 3/16th and AWB's
uses 1/4" bolts. Use a mill and bring the holes up to 1/4" referencing off
the edges of the existing holes that face each other. There is a 1" distance
between these hole edges for either tailwheel then if MAM's spacing is 1
3/16ths and AWB is 1 1/4" !
----- Original Message -----
From: "Eduardo Gutierrez Sosa" <lopeco.eduardo@gmail.com>
To: <rebel-builders@dcsol.com>
Sent: Monday, November 29, 2010 4:20 PM
Subject: RE: [rebel-builders] Super rebel/Moose tailwheel stinger
Hi Ted: I'm in the middle of doing something quite similar to your setup;
question: how do you "fill" the 3/16" hole on the stinger. I understand it
should NOT be filled with any welding process, but just filled with a
3/16"
pin with a force fit and then re-drilled to 1/4" and 1/16" further away
from
the other hole so as to make the distance 1-1/4" because the Alaskan
Bushwheel has 1/4" holes and are 1-1/4" apart while the original Murphy
stinger has 3/16" holes and 1-3/16" apart one from the other. Is this
clear,
or just mumble jumble?.....it makes perfect sense to me. I just figured
this
out a minute ago, and I hope you can endorse this procedure. Thanks a lot,
regards, Eduardo
-----Mensaje original-----
De: mike.davis@dcsol.com [mailto:mike.davis@dcsol.com] En nombre de Ted
Waltman
Enviado el: lunes, 29 de noviembre de 2010 12:48 p.m.
Para: rebel-builders@dcsol.com
Asunto: RE: [rebel-builders] Super rebel/Moose tailwheel stinger
Hello Jason,
I might have one. Have to look in the hangar. Unfortunately, the std
Murphy bold spacing is 1 3/16" if I recall correctly. I too use an AK
Bushwheel assembly; I had to have a machinist first fill then redrill my
current stinger.
Ted
-----Original Message-----
From: mike.davis@dcsol.com [mailto:mike.davis@dcsol.com] On Behalf Of
Jason
Beall
Sent: Monday, November 29, 2010 9:22 AM
To: new list server
Subject: [rebel-builders] Super rebel/Moose tailwheel stinger
Guys,
Short story: I need a new tailwheel stinger...either factory or
aftermarket.
Anyone have a used one they want to sell? I want to use an Alaska
Bushwheel
tailwheel and the bolt spacing is 1.25 inch.
Or...does anyone know what alloy and if there is any heat treating applied
to the Murphy stinger?
Thanks, -Jason
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