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[rebel-builders] Murphy Floats rigging

https://www.murphybuilders.net/viewtopic.php?f=1&t=12119

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[rebel-builders] Murphy Floats rigging

Posted: Sun Feb 19, 2012 8:54 pm
by montanafloat
Carl
How long are your spreader bars? If they are around 75" long they will work
fine, But you will need to lower the plane down from the original Murphy
height. If you go with the strut length shown in the Murphy float manual
it will set to high, you need to lower the airplane down some. On spreaders
that are about 75" the belly of the plane should not be over about 24" above
the floats. The angle of the struts should be no less than 45 degrees and a
max of about 55 degrees. ( looking at the struts from the front of the
airplane)
I have flown both the original width floats and the narrower lower ones and
like the narrow ones better.
Keith

-----Original Message-----
From: mike.davis@dcsol.com [mailto:mike.davis@dcsol.com] On Behalf Of
carl.burger@dcsol.com
Sent: Tuesday, August 23, 2011 6:10 PM
To: rebel-builders@dcsol.com
Subject: [rebel-builders] Murphy Floats rigging

Gents,

I'm new to the forum. Just bought a set of 1800 amphibs previously rigged
for
a beefed up Kitfox. The spreader struts are cutted 9" shorter than Murphys
recommended width for a Rebel installation. Have heard that some
recommend the narrower width. Please point me in the correct direction for
the files or conference.

thx
Carl



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[rebel-builders] Murphy Floats rigging

Posted: Sun Feb 19, 2012 8:54 pm
by Burger, Carl
Thanks Keith

I will measure them this weekend.

Stupid question but if I calculate the percentage of decrease in spreader bar Dia. And apply it to the struts I should still be within acceptable limits you would think?

Carl

-----Original Message-----
From: mike.davis@dcsol.com [mailto:mike.davis@dcsol.com] On Behalf Of montanafloat
Sent: Wed, Aug 24, 2011 17:30
To: rebel-builders@dcsol.com
Subject: RE: [rebel-builders] Murphy Floats rigging

Carl
How long are your spreader bars? If they are around 75" long they will work
fine, But you will need to lower the plane down from the original Murphy
height. If you go with the strut length shown in the Murphy float manual
it will set to high, you need to lower the airplane down some. On spreaders
that are about 75" the belly of the plane should not be over about 24" above
the floats. The angle of the struts should be no less than 45 degrees and a
max of about 55 degrees. ( looking at the struts from the front of the
airplane)
I have flown both the original width floats and the narrower lower ones and
like the narrow ones better.
Keith

-----Original Message-----
From: mike.davis@dcsol.com [mailto:mike.davis@dcsol.com] On Behalf Of
carl.burger@dcsol.com
Sent: Tuesday, August 23, 2011 6:10 PM
To: rebel-builders@dcsol.com
Subject: [rebel-builders] Murphy Floats rigging

Gents,

I'm new to the forum. Just bought a set of 1800 amphibs previously rigged
for
a beefed up Kitfox. The spreader struts are cutted 9" shorter than Murphys
recommended width for a Rebel installation. Have heard that some
recommend the narrower width. Please point me in the correct direction for
the files or conference.

thx
Carl



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Version: 10.0.1392 / Virus Database: 1520/3853 - Release Date: 08/23/11




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[rebel-builders] Murphy Floats rigging

Posted: Sun Feb 19, 2012 8:54 pm
by Ken
Suggest you draw the diagram out to scale and do the math Carl.
Percentages will likely give the wrong answer since you are not also
shrinking the distance between the fuselage mounting points by a percentage.
Ken

On 8/26/2011 3:28 PM, Burger, Carl wrote:
Thanks Keith

I will measure them this weekend.

Stupid question but if I calculate the percentage of decrease in
spreader bar Dia. And apply it to the struts I should still be within
acceptable limits you would think?

Carl

-----Original Message----- From: mike.davis@dcsol.com
[mailto:mike.davis@dcsol.com] On Behalf Of montanafloat Sent: Wed,
Aug 24, 2011 17:30 To: rebel-builders@dcsol.com Subject: RE:
[rebel-builders] Murphy Floats rigging

Carl How long are your spreader bars? If they are around 75" long
they will work fine, But you will need to lower the plane down from
the original Murphy height. If you go with the strut length shown in
the Murphy float manual it will set to high, you need to lower the
airplane down some. On spreaders that are about 75" the belly of the
plane should not be over about 24" above the floats. The angle of the
struts should be no less than 45 degrees and a max of about 55
degrees. ( looking at the struts from the front of the airplane) I
have flown both the original width floats and the narrower lower ones
and like the narrow ones better. Keith

-----Original Message----- From: mike.davis@dcsol.com
[mailto:mike.davis@dcsol.com] On Behalf Of carl.burger@dcsol.com
Sent: Tuesday, August 23, 2011 6:10 PM To: rebel-builders@dcsol.com
Subject: [rebel-builders] Murphy Floats rigging

Gents,

I'm new to the forum. Just bought a set of 1800 amphibs previously
rigged for a beefed up Kitfox. The spreader struts are cutted 9"
shorter than Murphys recommended width for a Rebel installation. Have
heard that some recommend the narrower width. Please point me in the
correct direction for the files or conference.

thx Carl


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[rebel-builders] Murphy Floats rigging

Posted: Sun Feb 19, 2012 8:54 pm
by Wayne G. O'Shea
Carl.. I make the spreaders 5" shorter (@ 79.25") than MAM's instructions
(at I believe 84 or so), to keep the strut angles the same.... as I shorten
the front struts by 3" from MAM's instructions. This strut length gives a
c/c distance between floats of 89". This spreader bar shortening amount
keeps the forward "view" angle the same so that the load transfer stays the
same into the fus cage, but at the same time you are decreasing the angle of
the front struts. The rear strut is straight and as you lower the airplane
the front strut needs to have a shallower rise from float attach to fus
attach and if you get too shallow you are asking for trouble. The lowering I
do, by making the struts 3" shorter, only lowers the aircraft about 2.5" and
at this point you are using the maximum that you're going to get away with
in respect to deflecting the supplied front strut attach fittings. As it is
they need to be milled/relieved so they will fit in the strut ID as they
aren't going in straight anymore, they are cocked. So while your spreaders
are currently 4" shorter than what I like to do, you are going to be limited
to about 3" shorter on the struts unless you custom make the forward strut
fittings.

Wayne

----- Original Message -----
From: "Burger, Carl" <carl.burger@aveos.com>
To: <rebel-builders@dcsol.com>
Sent: Friday, August 26, 2011 3:28 PM
Subject: RE: [rebel-builders] Murphy Floats rigging


[quote]Thanks Keith

I will measure them this weekend.

Stupid question but if I calculate the percentage of decrease in spreader
bar Dia. And apply it to the struts I should still be within acceptable
limits you would think?

Carl

-----Original Message-----
From: mike.davis@dcsol.com [mailto:mike.davis@dcsol.com] On Behalf Of
montanafloat
Sent: Wed, Aug 24, 2011 17:30
To: rebel-builders@dcsol.com
Subject: RE: [rebel-builders] Murphy Floats rigging

Carl
How long are your spreader bars? If they are around 75" long they will
work
fine, But you will need to lower the plane down from the original Murphy
height. If you go with the strut length shown in the Murphy float manual
it will set to high, you need to lower the airplane down some. On
spreaders
that are about 75" the belly of the plane should not be over about 24"
above
the floats. The angle of the struts should be no less than 45 degrees and
a
max of about 55 degrees. ( looking at the struts from the front of the
airplane)
I have flown both the original width floats and the narrower lower ones
and
like the narrow ones better.
Keith

-----Original Message-----
From: mike.davis@dcsol.com [mailto:mike.davis@dcsol.com] On Behalf Of
carl.burger@dcsol.com
Sent: Tuesday, August 23, 2011 6:10 PM
To: rebel-builders@dcsol.com
Subject: [rebel-builders] Murphy Floats rigging

Gents,

I'm new to the forum. Just bought a set of 1800 amphibs previously rigged
for
a beefed up Kitfox. The spreader struts are cutted 9" shorter than Murphys
recommended width for a Rebel installation. Have heard that some
recommend the narrower width. Please point me in the correct direction for
the files or conference.

thx
Carl



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Checked by AVG - www.avg.com
Version: 10.0.1392 / Virus Database: 1520/3853 - Release Date: 08/23/11




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Disclaimer/Avertissement

This email and any files transmitted with it are privileged, confidential,
and intended solely for the use of the individual or entity to whom they
are addressed. Views expressed are those of the author and not necessarily
those of the Corporation or its affiliates. Any unauthorized use or
disclosure is prohibited. Please notify the sender if you have received
this email in error. Thank you for your co-operation.

Le présent courriel et, s'il y a lieu, ses pièces jointes constituent
des renseignements confidentiels et destinés au seul usage de leurs
destinataires, qu'il s'agisse de particuliers ou d'organismes. Les
opinions qui y sont exprimées sont celles de l'auteur et ne correspondent
pas nécessairement

[rebel-builders] Murphy Floats rigging

Posted: Sun Feb 19, 2012 8:54 pm
by montanafloat
Carl
Using percentage will not work, you will need to do a little math to get it
right.
Keith

-----Original Message-----
From: mike.davis@dcsol.com [mailto:mike.davis@dcsol.com] On Behalf Of
Burger, Carl
Sent: Friday, August 26, 2011 1:28 PM
To: rebel-builders@dcsol.com
Subject: RE: [rebel-builders] Murphy Floats rigging

Thanks Keith

I will measure them this weekend.

Stupid question but if I calculate the percentage of decrease in spreader
bar Dia. And apply it to the struts I should still be within acceptable
limits you would think?

Carl

-----Original Message-----
From: mike.davis@dcsol.com [mailto:mike.davis@dcsol.com] On Behalf Of
montanafloat
Sent: Wed, Aug 24, 2011 17:30
To: rebel-builders@dcsol.com
Subject: RE: [rebel-builders] Murphy Floats rigging

Carl
How long are your spreader bars? If they are around 75" long they will work
fine, But you will need to lower the plane down from the original Murphy
height. If you go with the strut length shown in the Murphy float manual
it will set to high, you need to lower the airplane down some. On spreaders
that are about 75" the belly of the plane should not be over about 24" above
the floats. The angle of the struts should be no less than 45 degrees and a
max of about 55 degrees. ( looking at the struts from the front of the
airplane)
I have flown both the original width floats and the narrower lower ones and
like the narrow ones better.
Keith

-----Original Message-----
From: mike.davis@dcsol.com [mailto:mike.davis@dcsol.com] On Behalf Of
carl.burger@dcsol.com
Sent: Tuesday, August 23, 2011 6:10 PM
To: rebel-builders@dcsol.com
Subject: [rebel-builders] Murphy Floats rigging

Gents,

I'm new to the forum. Just bought a set of 1800 amphibs previously rigged
for
a beefed up Kitfox. The spreader struts are cutted 9" shorter than Murphys
recommended width for a Rebel installation. Have heard that some
recommend the narrower width. Please point me in the correct direction for
the files or conference.

thx
Carl



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-----
No virus found in this message.
Checked by AVG - www.avg.com
Version: 10.0.1392 / Virus Database: 1520/3853 - Release Date: 08/23/11




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Disclaimer/Avertissement

This email and any files transmitted with it are privileged, confidential,
and intended solely for the use of the individual or entity to whom they are
addressed. Views expressed are those of the author and not necessarily those
of the Corporation or its affiliates. Any unauthorized use or disclosure is
prohibited. Please notify the sender if you have received this email in
error. Thank you for your co-operation.

Le présent courriel et, s'il y a lieu, ses pièces jointes constituent des
renseignements confidentiels et destinés au seul usage de leurs
destinataires, qu'il s'agisse de particuliers ou d'organismes. Les opinions
qui y sont exprimées sont celles de l'auteur et ne correspondent pas
nécessairement à celles de la société ou de ses affiliées. Il est
interdit d'utiliser ou de divulguer ces renseignements sans autorisation. Si
vous avez reçu ce courriel par erreur, veuillez communiquer avec son
expéditeur. Nous vous remercions de votre collaboration.




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