The Bolly Optima Series 3 props are (ground) adjustable pitch props, using a 1.5" shank. Performance is supreme, with silky smoothness at high efficiency levels.

Pitch: Unlike our other BOS propellers, the Series 3 are ground adjustable to the required pitch and engine load. We have optimised the design to allow for this. As with all props they are at their most efficient at one optimal pitch setting, and it is this setting that we quote. The less a prop is changed from this the better the performance, although we have customers reporting excellent performance /- 7 degrees outside this parameter.

Hubs: All BOS3 Hubs are CNC machined from aviation grade 7075 alloy plate (not a cheap casting) and treated for corrosion resistance (hence the gold colour). The hubs feature a blade grip pattern that is far superior to a smooth surface, it has more grip surface area and the blade pitch is less likely to move when the hub is tightened.

Hubs to suit the 75mm PCD bolt pattern, ie many Rotax, Hirth etc are available in 2B, 3B and 4B.

We also have 2B and 3B hubs for most other common bolt patterns such as Rotax C box (100mm PCD), some Subaru's (4 inch / 101.6mm PCD) and to suit Rotax 912/4 (old and new with rear face drive stud holes).

Notes: Overall propeller diameter may vary from hub to hub. For example a 72" blade may vary from 70" (Bolly 912 hub), 71.5" (2B or 3B in 75mm PCD hub) or 72" (in Bolly 4B hub or some hubs by other manufacturers).

Blade Info + Pricing.

Now standard with DuraTuff leading edge.

The below prices are A$ retail only, including gst. For gst exempt export, deduct 1/11th.

 

Complete Propeller Set Prices.

The below new prices are A$ retail only, including gst. For gst exempt export, deduct 1/11th.

The below prices INCLUDES standard prop mounting hardware (washer plate and engine mounting bolts). We need to have details of your engine and gearbox etc so we can provide the correct hardware.

If your application needs something different to standard applications (ie a spacer), it will be an extra purchase, and quite often we will have it in stock. See "Hardware" page for more details.

News : Latest overspeed testing has gone to mach 1.01 tip speed (for proving the DuraTuff leading edge).

The Bolly BOS3 68 x 58 (left and right hand versions) in our standard hub (66" 3B prop) have been certified for use in the Airborne XT series of Trikes, with Rotax 912 or 582. This entailed, amonst other things, overspeed testing at mach .97 tip speed using every bit of power from a 200hp engine - an awesome experience that has given us enourmous confidence in our product. And then there was the 10 ton pull test + more.

As pictured above, a Trike with Rotax 582 3.47 gearbox using 72 x 60 S R blades in a BOS3 - 3B hub, slightly depitched. True size is 70 x 55 3B. A perfect combination on Airborne Edge machines, winning rave reviews from the many who are using this combo.

Extensive Trike testing has shown our props are suitable on all Rotax 912 / 582 / 503 powered trikes from slow to fast Trike Types. Ring or email for full details.

Sapphire. The most recent tests have been the BOS3 53 x 50 SR as a 3B prop, (trimmed slightly in diameter to 60") for use on the Sapphire. Initial feedback is exceptionally good. We are waiting for a full report from Steve Dumnsey of Sapphire Aircraft (03 54397168).

Savannah / Lightwing etc with 100hp Rotax 912S is great when using the BOS3 72 x 58 S R blades in a BOS3-3B hub. True size 70" 3B, or alternatively if ground clearance or cruise speed are priorities - the same but using the BOS3 68 x 58 SR blades (true size = 66" 3B).

Skyfox / Lightwing / Rans with Rotax 912 using 72 x 60 S R blades in a BOS3 - 2B hub, depitched. True size is 70 x 52 2B. We prefer the 3B prop, see below ...

Lightwing / Rans / Skyfox / Gazelle etc with Rotax 912 using 68 x 58 S R blades in a BOS3-3B hub, depitched. True size is 66 x 48 3B. Awesome smoothness.

Lightwing (or similar) with Rotax 582 2.62 gearbox using 68 x 58 S L blades in a BOS3 - 3B hub, depitched. True size is 66 x 45 3B. Can also be used as 2B with slightly more pitch.

Lightwing (or similar) with Rotax 582 / 532 2.58 box using 68 x 58 S L blades in our BOS3-2B 75mm PCD hub. Depitch to 18 degrees at 22" radius. True size is 67.5 x 44 2B

The Cobra Arrow 108hp Subaru belt drive is using 72 x 60 S R blades in a BOS3 - 3B hub, pitched up. Awesome performance, we credit the prop, Tom credits the airframe. Both win.

The 72 x 60 S Left or Right is proving to be excellent on many different applications, the most common being Subaru engined machines such as Foxcon Terrier or Gyro's.

The 62 x 52 S R has been very encouraging. Great on strut braced Drifters as a 60" 3B prop and other pusher aircraft with Rotax 447 or 503. We personally fly (amongst other things) a Rotax 447 2.58 gearbox powered Trike, and after exhaustive testing we chose to use this prop with a BOS3-2B 75mm PCD hub. True size is 61.5" x 40" pitch.

We are recommending our standard BOS3 prop NOT be used on Jabiru engines - one day soon (est 2009) we will develop a new purpose built blade for this application.

Due for release in 2009 : Bolly IFA, In Flight Adjustable Propellers.