Each Hercules propeller is as unique as the aircraft it was made for
To optimise performance, every different aircraft type needs a unique propeller design. A propeller that has been finitely designed for a given aircraft, engine and intended use enables the aircraft to perform how it should.
A correctly designed and well made propeller will help to:
Reduce take-off distance
Improve rate of climb
Increase cruise speed
Improve fuel economy
Quicken throttle response
Reduce engine vibration
Traditionally, propeller makers produce a limited range of propellers and the customer has to settle for the closest fit for their requirements. The result is often a mis-match and the full potential of the aircraft is not realised.
We at Hercules have taken a new approach to propeller design and manufacture. Every Hercules propeller is designed and manufactured to suit your needs, for your aircraft. We do not produce ‘one size fits all’ propellers, instead, each one is fine tuned for its intended aircraft and purpose.
Each new Hercules propeller is commissioned, not just chosen. A consultation will take place between you and our designers to determine all the data and parameters that we need to produce the very best new propeller possible.
Performance expectations are an important discussion point since in order to create your optimum propeller we need to determine and take into consideration your expectations for cruise speed, take off and climb performance, short field flying and if applicable, aerobatics.
Aerodynamic design output
For every new design, all the different attributes of a propeller are adjusted to suit the airframe, engine and expected performance.
There is more to constructing an efficient propeller design than simply adjusting pitch and diameter. Also to be considered are pitch distribution, taper ratio, camber ratio and aspect ratio. All of these parameters interact with each other – our advanced computer design software balances them all to create the most appropriate aerodynamics.
Powerful computer technology makes our propellers affordable
Using our sophisticated computer program to number crunch the formulae, we calculate the optimum propeller design for your aircraft, fine tuning all the different aspects of the propeller blade design.
There is far more to getting the best out of a propeller than simply adjusting pitch and diameter.
Input data includes airframe dimensions and weight, engine power and RPM, expected performance and any special requirement such as long distance touring, air-racing, bush flying, STOL performance or aerobatics.
3D CAD modelling
Once the new propeller design has been finalised, a 3D CAD model is created. The CAD model is processed to create the programs that the CNC machine follows when making the propeller.
Computer Aided Manufacturing (CAM) simulation
If you have a specific requirement for a propeller to optimise your aircraft’s performance, whether your machine is a vintage pioneer or a composite speed machine, please contact us, we can design and manufacture a propeller just for you.
Planform Design Options
Although flight performance is the most important consideration to all of our propeller designs, we can also design the planform shape of the propeller to appropriately match the aircraft it is intended for. The majority of the propellers we design and manufacture have a symmetrical planform but we can also give the blade shape a classic curved shape for vintage aircraft and replicas.
If you have a particular requirement, please enquire – it is more than likely we can design and make it for you.
Hercules Symmetrical Planform
Hercules Classic Planform
Inspired by what could be the most famous fighter of all time, Hercules propellers designed with our symmetrical plan forms have ‘Spitfire Tips’.
Just like the fighter, there is far more to it than just good looks, this profile greatly improves efficiency by minimising induced drag and reducing noise.
Once a common feature of wooden propellers, the hub part of the propeller would sometimes be conical in shape. Featuring tapering sides which when fitted with a skull cap spinner, form an aerodynamic shape, blending the propeller into the engine cowling. Creating bespoke propeller hubs to the original or your own specification is no problem for us to achieve. If your propeller requires a special design feature, please ask, it is more than likely we can do it.