This uses a 1.5 inch OD .125 wall 4130 tube for the nose gear
strut. It is bent at a 45 degree angle with a 10 inch radius.
You need to search Google for a short 2 inch air cylinder
for the damper. The latest trick in shocks is to use a separate reservoir
and the ID of the small tube connecting the two controls the damping.
BTW Zero manufacturing makes some great oil pans.
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These cylinders might work. Connect the upper port to
a pressure can with small tubing. Fill the can about half way with
hydraulic fluid. The remaining air in the can will serve as the spring.
A two inch stroke might be about right.
BTW I just discovered Linux and my display will do this.
Very useful when it comes to screen captures of web pages.
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This is a more compact version.
Paul Lamar
Hi Paul, that's absolutely spectacular!
Will it still be possible to fabricate this at do-rite in CA? And for all
your effort and the design changes I will be happy to package up and send
you the Greddy oil pan on my engine as a
token of thanks.
Alex Molteno
Order the motor plate from Jeff first. Have Jeff drop ship it to me.
Jeff call me when you are ready to ship for a shipping address.
Do rite will need that to weld the MM.
Alex, I will give you a list of materials to order from AC Spruce
or any other 4130 tubing supplier.
Alex, Do Rite can also weld the oil pan. Zero does not stock a suitable
deep drawn pan so Do Rite will have to weld it from sheet.
Here are the dims on the four 4130 .049 wall tubing sizes.
1/2 inch round for the lower diagonal bracing.
1 inch round for the lower compression struts.
3/4 inch round for everything else.
3/4 by 1 and a 1/2 .049 rect. for the rear beam.
Add it all up and order
it and have it dropped shipped to me.
I'll send you a shipping address when you are ready.
I have an RX8 steel oil pan we can get the hole
pattern from.
Paul Lamar
I'm an avid cyclist and there are lots of companies making short
stroke dampers for mountain bikes.
E.G. Fox, Marzocchi, Manitou, Rock Shocks. Cyclists obsess about
weight in a similar manner to plane builders so the light but expensive
rule applies.
Darren Dyck
http://tinyurl.com/aphtmg6
Do you have any dimensions or force verses deflection curves.
The oleo I spoke about above rapidly increases the force in a highly
nonlinear fashion as the cylinder is compressed and the air in the
can is compressed.
Dropping a 2000 pound aircraft in from 15 feet or so can
be a six G impact. The total would be 12,000 pounds.
One third of that for the nose gear would be 4000 pounds.
The Kis Cruiser uses 2 inch die springs for the nose gear
with a similar design to that of the Cirrus. The die springs
used are 600 to 800 pounds per inch of deflection.
The Kis was designed for a landing load of 4.5 G's.
With the remote reservoir one can adjust the force and damping
by changing the ID of the hose and the dimensions of the external can.
Paul Lamar
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