I have seen this prop perform well on an OS140 mounted in a beautiful Symphony. NO pics though? Does anyone know where to find a picture of this new prop...blade shape is a bit different from standard APC blade.

TIA.

As seen in the two blade (2B) prop chart provided, an APC 18x10 prop is at max load for the OS 140 RX (tuned system).

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Schpankme

Having carried the gentlemens Symphony OS140 18X10 out to the flight line at Larks. I really doubt it was turning 10,500.

That chart looks funny, why do RPMs increase with increasing pitch?

Who said it means RPM ?

The numbers inside the chart are loads.

ini

ini, is right.

The numbers inside the chart represent prop loads. Finding the "like" prop load tells you which prop "might" be a good match.

Note: all props are not created equal, the chart is meant as a handy reference tool.

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Schpankme

This is a horrible pic..sorry..I will get one in better light tomorrow and take a tach reading as well.

The prop on the ground is a 17x12...

Who is carrying this prop, think I saw Chip using one at the nats.

Whats it weigh?

that looks funny, rounded tips? well if it works well i might put one on my 3M170

It looks like a GWS direct drive prop.

Flew mine today...got 8100rpm (not peaked) on the ground...OS160fx, perry pump, greve pipe, 15% pwrmstr, sealevel (houston), 74°F...low humidity(??). It flew very well but definitely slower...duh. It would be great prop on a lighter (10 - 10-1/2 lbs.) airframe. But on my plane, I feel that I like more speed in the upline to pull top radii real smooth....and today was a very calm day, so it may be worse on a windy day. For now, I will stick with the 17x12 but overall, a very good prop and may be perfect on my new (lighter) Insight.

wieght: 4.3oz

OS 160 FX Prop Evaluation

17x12 @ 8200 = 93 mph


17.5x12 @ 7900 = 90 mph

17.5x11 @ 8150 = 85 mph


18x10 @ 8100 = 77 mph

18x11 @ 7850 = 82 mph

18x12 @ 7600 = 87 mph


Note: mph is estimated to evaluate performance

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Schpankme

What is the source of the chart?