Hello Rowland,
Quite probably way past its sell-by date but, according to Karen at Europa, the
TW spring is SAE 6150 steel alloy, hardened & tempered to Rockwell C42-44. Later
ones also come zinc chromate primed, so the implication is to paint it.
I would prefer to leave mine bare metal in colour to match the main gear leg, so
I enquired about plating with a specialist (Precision Aircraft in Reading) and
they advised:
"I have attached a photo of a cad finish so you can see what colour your part
would
look like when plated, cadmium is a white colour but is dipped in the olive
drab passivation solution after plating and de-embrittlement. Your part would
require stress relieving prior to cadmium plating 190-230C for a minimum of
4 hours. After plating your part would require de-embrittlement which would be
the same times and temperature as the stress relieve."
I don't much care for the resulting colour, so I may be forced to paint mine
white
- it is far enough away from the main leg not to jar on the eye and Dave J's
doesn't look too bad after 14 years...
NB the attached picture is NOT what a TW spring looks like after cad plating!
HTH
Paul M
383 XS Mono 912s
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