Hi Rick !
I'd be a bit worried about the suitability of those springs you've
got !! Can you find out their travel, compression rate, load rating, ...
and maybe Wayne can help with other factors ??? It might save you a
bent airplane, if they might collapse, or are so stiff that they bend
the structure .... (Check the recent archives for Wayne's comments.)
As I've said often, I really didn't recommend the coil spring
setup, as it CAN transmit heavy, undamped loads that can cause airframe
damage, OR start shimmy, OR ... (a whole bunch of problems) !!
And - what do you do if a spring breaks, or the bolt fails, or ...
You really have to do a proper engineering analysis - and I feared
that most builders would not (<I> certainly wouldn't know HOW !!)
(and you can bet there are good reasons Murphy didn't use this type
of suspension ...)
My current Rebel has Wayne's coil spring legs, and it gives
a SUPERB ride - and doesn't 'waddle' like the spring gear. I spoke
to Wayne about all of the things he considered in the design, and
believe that the energy absorbtion & dissipation in <his> setup will
protect my Rebel just as well as the bungees. I suggest that everyone
should satisfy themselves about all the factors before changing
something as important as the gear.
Gord Mohr makes a very nice set of solid machined bushings that
fit inside the gear leg tubing. They provide a LOT more bearing surface
for the gear bolts, which would otherwise wear elongated holes in the
gear leg tubes very quickly. The bungee gear is NOT supposed to move,
unless the fuse is in danger of damage, so the normal bolt setup is
ok. When you go to coil spring gear, the gear can, and does, move
constantly, so the bolts & tubes wear much more quickly ...
These bushings, if oiled regularly, should retain a bit, and
last for many years with no extra maintenance. Wayne can fill in more
details on these bushing sets - he's installed a few !
.....bobp
--------------------------------orig.-----------------------------------------
At 01:58 AM 12/26/00 +1100, you wrote:
Dear Bob ;
Just read your e-mail regarding the fitting of coil springs instead
of bungee cords....
I bought two "die springs" as you call them from Rich Bartman a few years
back......all I know /
can recall is that Rich said that he had fitted the "Heavy Duty"
springs...and they weren't enough as they sagged in time, so he recommended
fitting the "Extra Heavy Duty" springs...which I purchased
from him and fitted.
I think Rich said they were "McMaster" or something like that....I'll send
him an e-mail and see if he can remember.
Anyway......I read your comments on "You MUST fit Gordon Mohrs gear bolt
bushings if you
use coil springs".....
Can you explain their need / purpose please ?
Thanks guys !
Rick & Wendy Harper
16 Tor rd, Dee Why,
N.S.W. 2099
Australia
rjwh@ozemail.com.au
rjwh56@hotmail.com
Ph : 02 9971 7889
Mbl : 0416 041 007
O'seas Ph : 612 9971 7889
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<META content="MSHTML 5.00.2314.1000" name=GENERATOR>
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<DIV><FONT size=2><EM>Dear Bob ;</EM></FONT></DIV>
<DIV> </DIV>
<DIV><EM><FONT size=2> Just read your
e-mail regarding the fitting of coil springs instead of bungee
cords....</FONT></EM></DIV>
<DIV> </DIV>
<DIV><FONT size=2><EM>I bought two "die springs" as you call them from Rich
Bartman a few years back......all I know / </EM></FONT></DIV>
<DIV><FONT size=2><EM>can recall is that Rich said that he had fitted the
"Heavy
Duty" springs...and they weren't enough as they sagged in time, so he
recommended fitting the "Extra Heavy Duty" springs...which I
purchased</EM></FONT></DIV>
<DIV><FONT size=2><EM>from him and fitted.</EM></FONT></DIV>
<DIV><FONT size=2><EM>I think Rich said they were "McMaster" or something like
that....I'll send him an e-mail and see if he can remember.</EM></FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=2><EM>Anyway......I read your comments on "You MUST fit Gordon
Mohrs gear bolt bushings if you</EM></FONT></DIV>
<DIV><FONT size=2><EM>use coil springs".....</EM></FONT></DIV>
<DIV><FONT size=2><EM>Can you explain their need / purpose please
?</EM></FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=2><EM>Thanks guys !</EM></FONT></DIV>
<DIV> </DIV>
<DIV><EM><FONT size=2>Rick & Wendy Harper<BR>16 Tor rd, Dee Why,
<BR>N.S.W.
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