The Murphy Builders Site

The tubes will take the shape of the tire -- quite different from what
they will do in free space, as you're seeing without tires. Should be
fine. Besides, you'll be carefully checking that stem angle &
condition at every pre-flight, right? ;-)

Ron
254R



On Sat, Jun 25, 2011 at 2:56 PM, Ben Ransom <bransom@ucdavis.edu> wrote:
[quote]Today I put a tube on a standard 6" MAM wheel without the tire and noticed that the ID of the tube is at least 1 inch bigger than the OD of the wheel, with air pumped in, or not.

I have the same tubes and they've worked fine for years.
Sent on the TELUS Mobility network with BlackBerry

-----Original Message-----
From: Ben Ransom <bransom@ucdavis.edu>
Sender: mike.davis@dcsol.com
Date: Sat, 25 Jun 2011 21:56:51
To: rebel-builders@dcsol.com<rebel-builders@dcsol.com>
Reply-to: rebel-builders@dcsol.com
Subject: [rebel-builders] tires, tube valve stem

Today I put a tube on a standard 6" MAM wheel without the tire and noticed that the ID of the tube is at least 1 inch bigger than the OD of the wheel, with air pumped in, or not. Maybe this is unimportant, because the tube will fill all the space with the tire on. But I'm wondering if this could lead to the tire working the tube around to the point of breaking off the valve stem

FWIW on JDM wheels and 600x6 tires:

-oversize tubes soon leak if there is a fold in them

-the tire eventually rotates on the rim if less than industry standard
pressure which is about 24 to 26 psi. they go real flat real quick!

-wallmart (600x6x15?)tubes eventually leak, sometimes quickly once the
leak starts. If you look closely they have numerous nicks or little
imperfections. However they are cheap,available, and easy to change.
Carry a spare and two 7/16" wrenches. You will need a scissor jack, an 8
ft. long 2x6 lever under the axle, or two guys to lift the wing, all of
which are surprisingly easy to find when the need arises...

-Angus used certified straight stem tubes and wrapped a flexible truck
extension (from dual wheel setups) around the inside of the wheel and
out the valve hole. I have not tried that.

-Lastly I have actually seen a certified bent stem 600x6 tube but I
choked on the price which was over $100. each.

Ken

I have the same tubes and they've worked fine for years.
Sent on the TELUS Mobility network with BlackBerry

-----Original Message-----
From: Ben Ransom <bransom@ucdavis.edu>
Sender: mike.davis@dcsol.com
Date: Sat, 25 Jun 2011 21:56:51
To: rebel-builders@dcsol.com<rebel-builders@dcsol.com>
Reply-to: rebel-builders@dcsol.com
Subject: [rebel-builders] tires, tube valve stem

Today I put a tube on a standard 6" MAM wheel without the tire and

noticed that the ID of the tube is at least 1 inch bigger than the OD of
the wheel, with air pumped in, or not. Maybe this is unimportant,
because the tube will fill all the space with the tire on. But I'm
wondering if this could lead to the tire working the tube around to the
point of breaking off the valve stem

Hi Ken
Most of my flying will be off of grass so I installed 800 x 6 Carlisle Turf
Glide with 800 x 6 tubes and 90* bent stems. Had to drill the extruded part
of the JDM rims (slightly off center) and add an stem extender. Have not
flown then yet, any advise or concerns?
thanks
Charlie E. 802R
----- Original Message -----
From: "Ken Lehman" <klehman@albedo.net>
To: <rebel-builders@dcsol.com>
Sent: Friday, July 01, 2011 7:43 AM
Subject: Re: [rebel-builders] tires, tube valve stem

FWIW on JDM wheels and 600x6 tires:

-oversize tubes soon leak if there is a fold in them

-the tire eventually rotates on the rim if less than industry standard
pressure which is about 24 to 26 psi. they go real flat real quick!

-wallmart (600x6x15?)tubes eventually leak, sometimes quickly once the
leak starts. If you look closely they have numerous nicks or little
imperfections. However they are cheap,available, and easy to change.
Carry a spare and two 7/16" wrenches. You will need a scissor jack, an 8
ft. long 2x6 lever under the axle, or two guys to lift the wing, all of
which are surprisingly easy to find when the need arises...

-Angus used certified straight stem tubes and wrapped a flexible truck
extension (from dual wheel setups) around the inside of the wheel and
out the valve hole. I have not tried that.

-Lastly I have actually seen a certified bent stem 600x6 tube but I
choked on the price which was over $100. each.

Ken

I have the same tubes and they've worked fine for years.
Sent on the TELUS Mobility network with BlackBerry

-----Original Message-----
From: Ben Ransom <bransom@ucdavis.edu>
Sender: mike.davis@dcsol.com
Date: Sat, 25 Jun 2011 21:56:51
To: rebel-builders@dcsol.com<rebel-builders@dcsol.com>
Reply-to: rebel-builders@dcsol.com
Subject: [rebel-builders] tires, tube valve stem

Today I put a tube on a standard 6" MAM wheel without the tire and

noticed that the ID of the tube is at least 1 inch bigger than the OD of
the wheel, with air pumped in, or not. Maybe this is unimportant,
because the tube will fill all the space with the tire on. But I'm
wondering if this could lead to the tire working the tube around to the
point of breaking off the valve stem .and one would not likely see this
until stem failure. I've had this problem on my ultralight, although
that suggests other causes because there, the tube is a better fit to
the OD of the wheel. I'm sure that operating on low pressure is a
contributing cause, but it's also a desirable for the terrain we seem to
like.

Any thoughts or experience on this out there?

BTW, the tubes (original shipped from MAM) are stamped 8..00 - 6/7.

Thanks,
-Ben 496R

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Hi Charlie

I've never heard of anyone spinning a tire on the 800x6 tires despite
them running low pressure. Avoiding pavement also helps I guess. I
suspect soft turf tires are just extra drag for anyone that has springs
instead of bungees. I stayed with cheap certified 600x6 main tires but
did find that MAM's tailwheel sunk into wet soft turf a bit.

I have had trouble finding good stem extenders. Most won't accept air or
leak when I try to add air.

Ken

Hi Ken
Most of my flying will be off of grass so I installed 800 x 6 Carlisle

Turf

Glide with 800 x 6 tubes and 90* bent stems. Had to drill the extruded

part

of the JDM rims (slightly off center) and add an stem extender. Have not
flown then yet, any advise or concerns?
thanks
Charlie E. 802R
----- Original Message -----
From: "Ken Lehman" <klehman@albedo.net>
To: <rebel-builders@dcsol.com>
Sent: Friday, July 01, 2011 7:43 AM
Subject: Re: [rebel-builders] tires, tube valve stem

FWIW on JDM wheels and 600x6 tires:

-oversize tubes soon leak if there is a fold in them

-the tire eventually rotates on the rim if less than industry standard
pressure which is about 24 to 26 psi. they go real flat real quick!

-wallmart (600x6x15?)tubes eventually leak, sometimes quickly once the
leak starts. If you look closely they have numerous nicks or little
imperfections. However they are cheap,available, and easy to change.
Carry a spare and two 7/16" wrenches. You will need a scissor jack, an 8
ft. long 2x6 lever under the axle, or two guys to lift the wing, all of
which are surprisingly easy to find when the need arises...

-Angus used certified straight stem tubes and wrapped a flexible truck
extension (from dual wheel setups) around the inside of the wheel and
out the valve hole. I have not tried that.

-Lastly I have actually seen a certified bent stem 600x6 tube but I
choked on the price which was over $100. each.

Ken

I have the same tubes and they've worked fine for years.
Sent on the TELUS Mobility network with BlackBerry

-----Original Message-----
From: Ben Ransom <bransom@ucdavis.edu>
Sender: mike.davis@dcsol.com
Date: Sat, 25 Jun 2011 21:56:51
To: rebel-builders@dcsol.com<rebel-builders@dcsol.com>
Reply-to: rebel-builders@dcsol.com
Subject: [rebel-builders] tires, tube valve stem

Today I put a tube on a standard 6" MAM wheel without the tire and

noticed that the ID of the tube is at least 1 inch bigger than the OD of
the wheel, with air pumped in, or not. Maybe this is unimportant,
because the tube will fill all the space with the tire on. But I'm
wondering if this could lead to the tire working the tube around to the
point of breaking off the valve stem .and one would not likely see this
until stem failure. I've had this problem on my ultralight, although
that suggests other causes because there, the tube is a better fit to
the OD of the wheel. I'm sure that operating on low pressure is a
contributing cause, but it's also a desirable for the terrain we seem to
like.

Any thoughts or experience on this out there?

BTW, the tubes (original shipped from MAM) are stamped 8..00 - 6/7.

Thanks,
-Ben 496R

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Hi All
I've just ordered 2 600-6 tubes with 90* stem from Desser Aircraft Tire &
Rubber Company for 49.95 US each (15/600-6 "LEAKGUARD" BUTYL TUBE (New Easy
Valve)I'll report on how they work.
http://www.desser.com/store/products/15 ... ARD%22-BUT
YL-TUBE-(New-Easy-Valve).html
Dale

-----Original Message-----
From: mike.davis@dcsol.com [mailto:mike.davis@dcsol.com] On Behalf Of Ken
Lehman
Sent: July-01-11 8:44 AM
To: rebel-builders@dcsol.com
Subject: Re: [rebel-builders] tires, tube valve stem

FWIW on JDM wheels and 600x6 tires:

-oversize tubes soon leak if there is a fold in them

-the tire eventually rotates on the rim if less than industry standard
pressure which is about 24 to 26 psi. they go real flat real quick!

-wallmart (600x6x15?)tubes eventually leak, sometimes quickly once the
leak starts. If you look closely they have numerous nicks or little
imperfections. However they are cheap,available, and easy to change.
Carry a spare and two 7/16" wrenches. You will need a scissor jack, an 8
ft. long 2x6 lever under the axle, or two guys to lift the wing, all of
which are surprisingly easy to find when the need arises...

-Angus used certified straight stem tubes and wrapped a flexible truck
extension (from dual wheel setups) around the inside of the wheel and
out the valve hole. I have not tried that.

-Lastly I have actually seen a certified bent stem 600x6 tube but I
choked on the price which was over $100. each.

Ken

I have the same tubes and they've worked fine for years.
Sent on the TELUS Mobility network with BlackBerry

-----Original Message-----
From: Ben Ransom <bransom@ucdavis.edu>
Sender: mike.davis@dcsol.com
Date: Sat, 25 Jun 2011 21:56:51
To: rebel-builders@dcsol.com<rebel-builders@dcsol.com>
Reply-to: rebel-builders@dcsol.com
Subject: [rebel-builders] tires, tube valve stem

Today I put a tube on a standard 6" MAM wheel without the tire and

noticed that the ID of the tube is at least 1 inch bigger than the OD of
the wheel, with air pumped in, or not. Maybe this is unimportant,
because the tube will fill all the space with the tire on. But I'm
wondering if this could lead to the tire working the tube around to the
point of breaking off the valve stem .and one would not likely see this
until stem failure. I've had this problem on my ultralight, although
that suggests other causes because there, the tube is a better fit to
the OD of the wheel. I'm sure that operating on low pressure is a
contributing cause, but it's also a desirable for the terrain we seem to
like.

Any thoughts or experience on this out there?

BTW, the tubes (original shipped from MAM) are stamped 8..00 - 6/7.

Thanks,
-Ben 496R

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Hi. Ken I found some good valve extenders at princess auto just about the last place I'd expect to find quality stuff.
Sent on the TELUS Mobility network with BlackBerry

-----Original Message-----
From: Ken Lehman <klehman@albedo.net>
Sender: mike.davis@dcsol.com
Date: Fri, 01 Jul 2011 10:30:42
To: <rebel-builders@dcsol.com>
Reply-to: rebel-builders@dcsol.com
Subject: Re: [rebel-builders] tires, tube valve stem

Hi Charlie

I've never heard of anyone spinning a tire on the 800x6 tires despite
them running low pressure. Avoiding pavement also helps I guess. I
suspect soft turf tires are just extra drag for anyone that has springs
instead of bungees. I stayed with cheap certified 600x6 main tires but
did find that MAM's tailwheel sunk into wet soft turf a bit.

I have had trouble finding good stem extenders. Most won't accept air or
leak when I try to add air.

Ken

Hi Ken
Most of my flying will be off of grass so I installed 800 x 6 Carlisle

Turf

Glide with 800 x 6 tubes and 90* bent stems. Had to drill the extruded

part

of the JDM rims (slightly off center) and add an stem extender. Have not
flown then yet, any advise or concerns?
thanks
Charlie E. 802R
----- Original Message -----
From: "Ken Lehman" <klehman@albedo.net>
To: <rebel-builders@dcsol.com>
Sent: Friday, July 01, 2011 7:43 AM
Subject: Re: [rebel-builders] tires, tube valve stem

FWIW on JDM wheels and 600x6 tires:

-oversize tubes soon leak if there is a fold in them

-the tire eventually rotates on the rim if less than industry standard
pressure which is about 24 to 26 psi. they go real flat real quick!

-wallmart (600x6x15?)tubes eventually leak, sometimes quickly once the
leak starts. If you look closely they have numerous nicks or little
imperfections. However they are cheap,available, and easy to change.
Carry a spare and two 7/16" wrenches. You will need a scissor jack, an 8
ft. long 2x6 lever under the axle, or two guys to lift the wing, all of
which are surprisingly easy to find when the need arises...

-Angus used certified straight stem tubes and wrapped a flexible truck
extension (from dual wheel setups) around the inside of the wheel and
out the valve hole. I have not tried that.

-Lastly I have actually seen a certified bent stem 600x6 tube but I
choked on the price which was over $100. each.

Ken

I have the same tubes and they've worked fine for years.
Sent on the TELUS Mobility network with BlackBerry

-----Original Message-----
From: Ben Ransom <bransom@ucdavis.edu>
Sender: mike.davis@dcsol.com
Date: Sat, 25 Jun 2011 21:56:51
To: rebel-builders@dcsol.com<rebel-builders@dcsol.com>
Reply-to: rebel-builders@dcsol.com
Subject: [rebel-builders] tires, tube valve stem

Today I put a tube on a standard 6" MAM wheel without the tire and

noticed that the ID of the tube is at least 1 inch bigger than the OD of
the wheel, with air pumped in, or not. Maybe this is unimportant,
because the tube will fill all the space with the tire on. But I'm
wondering if this could lead to the tire working the tube around to the
point of breaking off the valve stem .and one would not likely see this
until stem failure. I've had this problem on my ultralight, although
that suggests other causes because there, the tube is a better fit to
the OD of the wheel. I'm sure that operating on low pressure is a
contributing cause, but it's also a desirable for the terrain we seem to
like.

Any thoughts or experience on this out there?

BTW, the tubes (original shipped from MAM) are stamped 8..00 - 6/7.

Thanks,
-Ben 496R

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