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  • Heli-Saw trims from the top of the tree down 150ft,  reaching branches that are untouchable by ground.

  • No encroachment or disturbance to right-of-ways.

  • Heli-Saw has immediate access to difficult to reach areas and terrain that would take ground crews hours to hike.

  • Heli-Saw’s average production rate of trimming under most conditions is to 6 miles per day. Increased production can be obtained in lighter vegetation types.

  • Heli-Saw can accomplish in one day what a      ground crew would do in weeks.

  • The ONLY fully hydraulic saw available in the industry designed for more robust and safer operation in heavier vegetation types such as western conifer and eastern hardwoods.  

  • Great for coastal timber, mountainous terrain,  inaccessible or accessible locations alike. 

  • Very successful in rural neighborhood settings when planned properly. 





Designed and Patented by T. Scott Dunn Inc.

Proven Innovation, tested in the Timber of the Pacific Northwest.

The Heli-Dunn Heli-Saw is an aerially applied saw used to side trim vegetation along power line right of ways or travel corridors. Ideal for both accessible and non-accessible terrain, a Heli-Saw operation can complete several miles of side trimming per day. Production will vary based upon vegetation type and field conditions. Vegetation that threatens reliability to infrastructure can be quickly and proficiently mitigated leading to significant reduction in project implementation time and cost savings. The Heli-Saw was developed with the harsh demands of equipment in mind when operating within the unforgiving conditions of our western forests. Hearty, large diameter trees line our utility right of ways and travel corridors that weave through steep and difficult terrain. The combination of the performance capability of the Astar 350 Helicopter and our Heli-Saw offers the safest and most productive ,cost effective option for side trimming available to several industries worldwide.


Heli-Dunn implemented a Heli-Saw Operation for Washington’s Tacoma Power in 2014. Many successes developed as Heli-Dunn
side trimmed several miles of vegetation that required maintenance along transmissions lines. Reduction of exposure to risk, expedited project implementation and cost savings were benefits of the use of the Heli-Dunn Heli-Saw. See the video below to learn more about the project.



PG&E Currents coverage of our Heli-Saw project in Sonoma County, California. 

In December of 2020, Heli-Dunn completed 60 miles of side trimming with our Heli-Saw on the Northern California Coast. Much coordination and planning was completed prior to and during implementation. The Heli-Saw was utilized in heavy conifer, mitigating hazards that are not easily or cost effectively by ground crews. 


What to Know..... 

Vegetation Managers

Our patented Heli-Saw and our unique implementation style have been developed over the course of many years and many different disciplines with talented personnel to create our method of operational implementation and level of safety. This can not be matched  by any other method or company in the industry to date. One of the primary reasons for this is the Astar 350 that we choose to operate as our platform for our vegetation program. With the performance and safety record of the Astar 350, especially at higher elevations and with typical required payloads for work within the utility and construction industries, we are proud to offer this superior option in aircraft. The aerial trimming industry and several of our competitors have chosen to utilize inferior aircraft to complete side trimming work in the Eastern United States. These firms have tried, without success and with a poor safety record, to develop business working for western based utilities. Wherever you're located, we invite you to learn more about the vast differences in performance, safety and productivity between contractors and invest in safety, performance and integrity with any contractor you choose.    

  • Ask questions about aircraft capabilities. 

  • Know the difference between an eastern aerial saw and The Heli-Saw. 

  • Investigate safety records and past performance.  

  • Be wary of companies who newly purchase aerial saw equipment. 

  • Beware of MD 500 models being utilized, especially in mountainous terrain for aerial trimming applications.


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