Heat treating Octura props

[Charlietuna1]

Can anyone tell me what grade of BC Octura props are cast from?
Or..... what heat treat recipes seem to work

[dasboata]

pretty sure its 3 hours at 700* this is what Terry Keely told me

[Charlietuna1]

Thank you

[rayray9]

Ceramics kiln?

[Charlietuna1]

Stress relief oven at work.

[fweasel]

Stress relief oven at work.

better than a self cleaning oven at home.

[Charlietuna1]

Still a little concerned about getting too brittle and hurling a blade at 27,000 rpm

[fweasel]

27k RPM seems to be on the low side. I've yet to have a problem with a CuBe prop, treated or not, on any of my setups below 45k rpm. I've seen blades thrown on much larger and faster boats than my own, but they were also significantly larger diameter props.

[nitrous8e]

Abc props ! Any one have any idea why its close to impossible to find and purchase props from them . 17-45 series and other series not having much luck.

[fweasel]

Props are not the primary business for the owner, Jim Schaefer. I believe they fall to the side when he's busy forging/casting other items.

[dmitry100]

Aren't there people who can make custom similar props?

Or modify existing *-17-45 series to increase Rake and decrease the Bar to something like the -19-38 or -23-38 series

[NativePaul]

There are, but I would guess at it being at least a couple of days work for a highly skilled man to design it, sculpt it form wax, mould the wax and cast the prop.

What does a highly skilled man charge in your area, here it would be £50-100 per hour, so I would expect the prop to cost more than the boat I was putting it on. Which is who most folk buy comercial props, they may not be exactly what you want, but the economies of scale make the price much more affordable even if someone is ony selling a couple of dozen.