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John Bolding
Joined: 23 May 2006
Posts: 281
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 Posted: Fri Jan 16, 2009 4:46 pm Post subject: Front fork weight |
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[quote] Hey Guys, anybody have the 701 fork/doubler laying around that they would be able to weigh? Might be able to save a pound or two if ONLY I knew how much I was starting with THANKS
John
[b]
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Harvey Richards
Joined: 26 Aug 2008
Posts: 39
Location: Nova Scotia
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| Posted: Sat Jan 17, 2009 2:40 am Post subject: Re: Front fork weight |
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I weighed the fork/doubler,no bolts rivets axle at 3lbs6oz
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John Bolding
Joined: 23 May 2006
Posts: 281
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| Posted: Sat Jan 17, 2009 3:04 am Post subject: Front fork weight |
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Thanks Harvey, I'll report once I weigh the possible alternative. John
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Harvey Richards
Joined: 26 Aug 2008
Posts: 39
Location: Nova Scotia
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| Posted: Sat Jan 17, 2009 7:37 am Post subject: Re: Front fork weight |
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You're welcome John. Will be interesting to know the possible weight savings. Harvey
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John Bolding
Joined: 23 May 2006
Posts: 281
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| Posted: Sat Jan 17, 2009 3:33 pm Post subject: Front fork weight |
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Harvey, Here's what I found,
The 701 fork/doubler is 3# 6oz, a fork from a C150 weighs 2#2oz. ASSUMING
you can get the axels to the same weight there's 1#4 oz.
The 150 fork slips right on the 701 nosewheel tube so nothing to build
there, the tube WILL need to be a little longer to make up for the slightly
taller tire you're replacing but that extra tube length will also weigh less
than the 3/16" plate that the standard fork/doubler bolts to that you no
longer need.
The Tundra tire/tube weighs 10#9oz , a 6:00x 6 tire and tube is 8# 9 oz
another 2# potential
In the last year I've weighed a half dozen or so different 6:00x6"
wheel/brake combo's, including a couple from Matco. The lightest I've run
into so far have been the older Goodyears that were used on Champs/Cubs
etc., brake parts are a bit scarce but I got a NICE set on ebay for $200
with extra pads. They weigh 3# less (for 2) than the Matco's. So by
changing things a bit you can save 4 1/2# on the wheels, 2# on the front
tire and 1# + on the fork for (drum roll please) 7 1/2# +.
It's HARD to knock weight off a 701 !!! My limit is $100 a pound,
here's 7 POUNDS that costs LESS. Boeing/Airbus would KILL for that!
Two things lead me to believe you don't need a tundra tire on the front of a
701 (other than it LOOKS cool) First is the fact that I watched Grant Rappe
taxi around the ultralight area with the nosewheel in the air, second is
I've landed on the Texas beach, cow pastures, dirt roads,sand bars etc 2-300
times in a taildragger airplane with 5:00 x5's. I KNOW it's an apple and an
orange but unless you have a 701 that's out of CG toward the nose I know I
can live with the slightly smaller nosewheel.
It also brings up the question of yaw. Hopefully a smaller tire will
produce less yaw instability than the larger one but that's just a WAG. I
KNOW it will have less drag.
I'm NOT recommending anything, just reporting my homework.
LO&SLO John
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vgstol(at)bigpond.net.au
Guest
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| Posted: Sat Jan 17, 2009 10:54 pm Post subject: Front fork weight |
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John B
Good to see that someone is really working on reducing weight. It does make a difference to performance. Every little bit helps. Carry on dieting......
JohnG
On Sun, Jan 18, 2009 at 9:31 AM, John Bolding <jnbolding1(at)teleshare.net (jnbolding1(at)teleshare.net)> wrote:
[quote]--> Zenith701801-List message posted by: "John Bolding" <jnbolding1(at)teleshare.net (jnbolding1(at)teleshare.net)>
Harvey, Here's what I found,
The 701 fork/doubler is 3# 6oz, a fork from a C150 weighs 2#2oz. ASSUMING you can get the axels to the same weight there's 1#4 oz.
The 150 fork slips right on the 701 nosewheel tube so nothing to build there, the tube WILL need to be a little longer to make up for the slightly taller tire you're replacing but that extra tube length will also weigh less than the 3/16" plate that the standard fork/doubler bolts to that you no longer need.
The Tundra tire/tube weighs 10#9oz , a 6:00x 6 tire and tube is 8# 9 oz another 2# potential
In the last year I've weighed a half dozen or so different 6:00x6" wheel/brake combo's, including a couple from Matco. The lightest I've run into so far have been the older Goodyears that were used on Champs/Cubs etc., brake parts are a bit scarce but I got a NICE set on ebay for $200 with extra pads. They weigh 3# less (for 2) than the Matco's. So by changing things a bit you can save 4 1/2# on the wheels, 2# on the front tire and 1# + on the fork for (drum roll please) 7 1/2# +.
It's HARD to knock weight off a 701 !!! My limit is $100 a pound, here's 7 POUNDS that costs LESS. Boeing/Airbus would KILL for that!
Two things lead me to believe you don't need a tundra tire on the front of a 701 (other than it LOOKS cool) First is the fact that I watched Grant Rappe taxi around the ultralight area with the nosewheel in the air, second is I've landed on the Texas beach, cow pastures, dirt roads,sand bars etc 2-300 times in a taildragger airplane with 5:00 x5's. I KNOW it's an apple and an orange but unless you have a 701 that's out of CG toward the nose I know I can live with the slightly smaller nosewheel.
It also brings up the question of yaw. Hopefully a smaller tire will produce less yaw instability than the larger one but that's just a WAG. I KNOW it will have less drag.
I'm NOT recommending anything, just reporting my homework.
LO&SLO John
---
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