The Murphy Builders Site

Hi gang -- for any of you who are not happy with your urethane
suspension, like myself, I have some good news.

Today , for the first time, I can actually jump up and down in the
float, watch the wheel go up and down, properly.

I installed die springs in place of urethane. 3.5 in by 1.5 in by .75
in ID Green or extra heavy duty. I did the calculations and figured I
needed this spring. Thats 1750 lbs when fully compressed. I machined
the aluminum washers so they had a .75 boss on them to center the
springs and to get the correct preload-- about .200 in. The springs fit
right in place.They support the plane right at the top of the slot in a
static postion but when you are taxing or landing you can see and feel
them move much more than before.

Besides that it was a great day for flying period and the bay was
smooth.

bob fisher rebel 342 amphib









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Hi gang -- for any of you who are not happy with your urethane
suspension, like myself, I have some good news.

Today , for the first time, I can actually jump up and down in the
float, watch the wheel go up and down, properly.

I installed die springs in place of urethane. 3.5 in by 1.5 in by .75
in ID Green or extra heavy duty. I did the calculations and figured I
needed this spring. Thats 1750 lbs when fully compressed. I machined
the aluminum washers so they had a .75 boss on them to center the
springs and to get the correct preload-- about .200 in. The springs fit
right in place.They support the plane right at the top of the slot in a
static postion but when you are taxing or landing you can see and feel
them move much more than before.

Besides that it was a great day for flying period and the bay was
smooth.

bob fisher rebel 342 amphib









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From: "Wayne G. O'Shea" <oifa@irishfield.on.ca>
Reply-To: <rebel-builders@dcsol.com>
To: <rebel-builders@dcsol.com>
Subject: Re: Amphib Suspension
Date: Sun, 8 May 2005 20:13:43 -0400

Sounds good Bob...not that I know anything about die springs.... LOL! Give
us an update after a month or two of "pounding" to see if things are
holding
up well.... with no detrimental effects. Turn that "slot" bolt once in
awhile to make sure it hasn't got bent. If you bottom the spring it won't
be
as forgiving as the urethane was.

Got my floats attached with spreader bars today and cross braced, ready for
installation to the airplane. Just have a logistics problem right now with
CYP's engine hanging from one of the block and tackles I need to lift the
airplane....and no CYP in site...nor can I get ahold of the (*%$%(!#( that
is painting it. Not a good sign and I don't need this horse rooster right
now!

Wayne

----- Original Message -----
From: "Bob Fisher" <rgfisher@zeuter.com>
To: "rebel builders" <rebel-builders@dcsol.com>
Sent: Sunday, May 08, 2005 7:23 PM
Subject: Amphib Suspension

Hi gang -- for any of you who are not happy with your urethane
suspension, like myself, I have some good news.

Today , for the first time, I can actually jump up and down in the
float, watch the wheel go up and down, properly.

I installed die springs in place of urethane. 3.5 in by 1.5 in by .75
in ID Green or extra heavy duty. I did the calculations and figured I
needed this spring. Thats 1750 lbs when fully compressed. I machined
the aluminum washers so they had a .75 boss on them to center the
springs and to get the correct preload-- about .200 in. The springs fit
right in place.They support the plane right at the top of the slot in a
static postion but when you are taxing or landing you can see and feel
them move much more than before.

Besides that it was a great day for flying period and the bay was
smooth.

bob fisher rebel 342 amphib









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I don't know anything about how the amphib gear works, but could you put a
couple of the doughnuts in with the die springs? That way you would have
bottom-out protection as well.
Jesse

From: "Wayne G. O'Shea" <oifa@irishfield.on.ca>
Reply-To: <rebel-builders@dcsol.com>
To: <rebel-builders@dcsol.com>
Subject: Re: Amphib Suspension
Date: Sun, 8 May 2005 20:13:43 -0400

Sounds good Bob...not that I know anything about die springs.... LOL!

us an update after a month or two of "pounding" to see if things are
holding
up well.... with no detrimental effects. Turn that "slot" bolt once in
awhile to make sure it hasn't got bent. If you bottom the spring it won't
be
as forgiving as the urethane was.

Got my floats attached with spreader bars today and cross braced, ready

installation to the airplane. Just have a logistics problem right now

CYP's engine hanging from one of the block and tackles I need to lift the
airplane....and no CYP in site...nor can I get ahold of the (*%$%(!#(

is painting it. Not a good sign and I don't need this horse rooster right
now!

Wayne

----- Original Message -----
From: "Bob Fisher" <rgfisher@zeuter.com>
To: "rebel builders" <rebel-builders@dcsol.com>
Sent: Sunday, May 08, 2005 7:23 PM
Subject: Amphib Suspension

Hi gang -- for any of you who are not happy with your urethane
suspension, like myself, I have some good news.

Today , for the first time, I can actually jump up and down in the
float, watch the wheel go up and down, properly.

I installed die springs in place of urethane. 3.5 in by 1.5 in by .75
in ID Green or extra heavy duty. I did the calculations and figured

needed this spring. Thats 1750 lbs when fully compressed. I machined
the aluminum washers so they had a .75 boss on them to center the
springs and to get the correct preload-- about .200 in. The springs

right in place.They support the plane right at the top of the slot in

static postion but when you are taxing or landing you can see and feel
them move much more than before.

Besides that it was a great day for flying period and the bay was
smooth.

bob fisher rebel 342 amphib









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-----------------------------------------------------------------

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