Helicopter spraying, or aerial application, is a very effective and precise method for distributing liquids over large or challenging land areas. It’s a technique offers a logistical advantage that traditional ground-based methods simply cannot match, especially across areas that are hard to reach, too expansive, ecologically sensitive, or other factors.
We delve into what helicopter spraying entails, how it works, and critical factors you need to weigh when deciding if it’s the right choice for your operation.
What is helicopter spraying?
Helicopter spraying involves using rotary-wing aircraft to disperse various liquid products like fertilisers, herbicides, pesticides, and fungicides, across agricultural or forestry land.
Unlike fixed-wing aircraft (planes), helicopters are able to fly at lower speeds and lower altitudes, putting exceptional maneuverability and targeting in the hands of a talented pilot. Unmatched control allows for targeted application, particularly in areas that are inaccessible to tractors. That makes it incredibly effective across New Zealand which is renowned for its variance in landscape: steep slopes and rocky outcrops, waterlogged paddocks and flatlands, dense plantation forests or nutrient-rich hills.
The ability to take off and land in smaller, makeshift sites close to the job area also significantly reduces ferry time and increases operational efficiency.
How does the process work?
Like most good things, operational success involved in helicopter spraying hinges on stringent planning and execution, and strict adherence to safety and environmental regulations. The process typically follows a clear sequence of steps, ensuring compliance and optimal coverage.
First, the heli spraying company will conduct a site assessment and recommend a product. This involves determining the specific treatment required, calculating the correct application rate and ratio, and selecting an approved chemical or product suited to New Zealand’s environmental standards.
Next is the load-up phase. The helicopter lands at a designated loading pad, often a truck or temporary station on-site, where the prepared liquid mix is pumped into the aircraft’s hoppers or tanks. The weight and volume are carefully managed to adhere to the aircraft’s maximum lift capacity and safety regulations.
The pilot, guided by GPS and sometimes pre-marked ground markers, flies a precise pattern over the target area. The spray is released through booms or nozzles mounted beneath the aircraft. Moder helicopter spraying operators use advanced dispersal systems and GPS guidance technology to track coverage and minimize overlaps or missed spots, ensuring an even and economical application.
Finally, expect to carry out post-application monitoring. This includes recording meteorological conditions during the spray like wind speed and temperature, while logging the exact area treated, maintaining a full compliance record as required by regulations.
How do I know if it’s right for me?
Deciding on aerial application requires a careful evaluation of your specific needs and constraints. Helicopter spraying offers pretty unparalleled speed and access, but it’s not always the best solution for every situation.
For example, if you manage a large farm, extensive crops, or property featuring significant steep or broken terrain, then helicopter spraying is likely the most practical and cost-effective solution per hectare.
Certain treatments, particularly those requiring immediate, widespread coverage across a rapidly developing crop or forest block, benefit from the speed of aerial application. However, you must consider product drift potential. While pilots can mitigate most effects by flying low and using specific droplet sizes to minimize drift, your land’s proximity to sensitive areas like waterways, organic farms, or residential properties might instead favour highly shielded ground methods.
Cost efficiency versus traditional spray application
Aerial spraying is a premium service. You must weigh the higher initial cost per hour against the long-term savings from reduced labour, faster completion times, and superior coverage on difficult ground. It’s critical you ensure your operation is fully compliant with all relevant Hazardous Substances and New Organisms (HSNO) Act and regional council rules. A reputable New Zealand aerial applicator will handle most of these regulatory requirements for you.
Helicopter spraying is a powerful tool in modern New Zealand land management. It offers speed, precision, and access to challenging landscapes.
What’s the best helicopter spraying service in Waikato and North Island?
There are a number of operators to choose from. Here are some of the top-rated ones.
Heli A1
Website: helia1.co.nz
Phone: +64 7 873 6695
Email: info@helia1.co.nz
Helicopter Services (BOP) Ltd
Website: helicopterservices.nz
Phone: +64 7 378 8074
Email: info@helicopterservices.nz
Helisika Helicopters Ltd
Website: helisikahelicopters.co.nz
Phone: 0508 435 424
Email: jaz@helisikahelicopters.co.nz
Skywork Helicopters Ltd
Website: skyworkhelicopters.com
Phone: +64 9 422 7018
Email: skywork@skyworkhelicopters.com
Heli-Hire Limited
Website: helihire.co.nz
Phone: +64 7 357 5110
Email: info@helihire.co.nz