Anyone Run an Octura 1.25 prop???

[Meniscus]

I'm wondering if anyone runs an Octura prop, model #1.25 at 31.75mm diameter?

If so, please provide feedback and your experience.


Thanks!

[Diegoboy]

I've never heard of that one.

[egneg]

I've never heard of that one.

It has a 1.8 pitch - pretty high for the size.

[Meniscus]

It has a 1.8 pitch - pretty high for the size.

That's exactly why I'm looking at it and getting input! Don't worry Egneg, you'll see it when I get you to B/S Thanks!

[Diegoboy]

I guess no one has seen one in person...

[NativePaul]

I take it this is a new prop not a Y531 that someone has converted the measurements from metric to imperial measurements on?

[m4a1usr]

I take it this is a new prop not a Y531 that someone has converted the measurements from metric to imperial measurements on?

Nope. Octura has a decimal designation for this series. But I have not seen that size, my catalog only goes down to a 1.6". All the decimal series are 1.8 pitch ratio. That is not the same as pitch.

John

[Meniscus]

I take it this is a new prop not a Y531 that someone has converted the measurements from metric to imperial measurements on?

Paul, is the Y531 available as metal? I haven't seen that and it doesn't appear in any of the Octura charts I've seen.

[NativePaul]

Not available in metal that I know of, its just a side effect of growing up at a metric time in a traditionally imperial measuring country, mental conversions are second nature to me, never having heard of Octuras decimal range when Egneg said it was 1.8pitch and being named 1.25 I put 2 and 2 together and made 5, the Y531 which is very close to 1.25dia 1.8pitch

got any charts with the decimal series in?

[Meniscus]

From what I saw from paper in a LHS, they read 1.25, 1.5, 1.6, 1.7, etc. which measures in inches.

The Y531 measures 31mm and the 5 indicates that it's 1.5 pitch.
Another example, X442 measures 42mm and 1.4 pitch.

I didn't see the pitch for the Octura model #1.25 on the sheet. I guess Egneg found it somewhere.

[old guy]

I just got 2 off ebay to day and there is one left 1.25 1/8 bore
Old guy

[NativePaul]

Ahh, I found them in the bottom octura prop chart on fastelectrics.com , it looks like the are the 17xx series renamed, if so I know someone that swears by them for riggers, but they are not for my uses.

[m4a1usr]

Looks like this.

John

[Fluid]

These are among the oldest of the Octura prop series, designed before Tom changed to the current metric prop designations. They are high-lift props with modest blade area, and all have the 1.8 pitch ratio. They really are not too much like the 1700 series.

I used the 1.6 and 1.8 props years ago when they were available in metal. They are appropriate for hydros only, and most castings were very thick. The 1.25 was introduced several years ago, the rest are ancient, nearly 50 years old.



.

[Meniscus]

Thanks Jay. I was thinking of trying one of these on my Batrax rigger. RPM's will be around 36,500's loaded (11.1 @ 3600kv). Any recommendations regarding taking some of the load off this prop, such as back cutting?