TECHNIQUE

Hazing - Propane Cannon

Click image for full page view with caption Click image for full page view with caption

Summary Information
Type of technique Health & Management / Disease Investigation & Control / Environmental and Population Management / Techniques:
Synonyms and Keywords Propane exploders. Detonators, gas-operated exploders
Description
  • A device for harassing animals in which propane gas is exploded within the "cannon" by the striking of a flint at an adjustable timed interval. The noise produced is directional, shot-gun like and loud (approximately 120dB).
    • The device consists of separate pressure and combustion chambers, an ignition mechanism, and a barrel to aim and magnify the blast, together with bottled supply of gas. (D135.3.w3, D160.App3.w11, D211.AppIIIc.w12)
    • A bellows is slowly filled with propane gas from the tank. The gas is then rapidly transferred to the firing chamber and ignited by a spark. (D160.App3.w11)
    • The device is preferably set above surrounding vegetation or landscape features in order to maximise their effective range. (D10)
    • In windy conditions, a barrier such as a large piece of plywood is placed to protect the rear part of the cannon, housing the ignitor. (D211.AppIIIc.w12)
  • Some devices can be set to fire in varying directions.
  • Some can be set to fire at varying intervals (from less than a minute to 30 minutes). (D160.App3.w11); from three to 30 minutes (D211.AppIIIc.w12).
    • When several exploders are used they should be set with staggered firing intervals. (D135.3.w3)
    • Some exploders can be set to fire at random intervals and in a different direction for each blast. (D160.App3.w11)
  • The blast intensity may be adjustable.
  • The period of operation may be adjustable. 

(B36.4.w4, B127.12.w12, D135.3.w3, D160.App3.w11, D211.AppIIIc.w12)

Appropriate Use (?)
  • May be used in a variety of settings including airports, agricultural areas, landfill sites and even on water (on e.g. an anchored raft or a drifting boat). (D10, D160.App3.w11)
  • May be particularly effective to deter birds e.g. from oil which is in a confined area. (D10)
  • Effective against a wide range of bird species. (D10)
  • Effective day and night - shown to be effective in dispersing waterfowl feeding at night. (D10, D160.App3.w11)
    • Particularly appropriate for nightime use (since personnel are not required once the device is set) in areas without human populations. (D10)
  • Particularly effective against dabbling ducks and geese. (D10, D160.App3.w11)
  • Most effective against migrating and hunted species which associate loud noises with danger. (D135.3.w3)
  • Can be mobilised and moved rapidly. (D160.App3.w11)
  • Rapid initial effect. (D10)
  • May be effective on reasonable-sized areas (200 to 1,000m, or 30 to 50 hectares). (D10, D160.App3.w11)
  • Low manpower requirement for both deployment and operation (e.g. daily check). (B36.4.w4, D160.App3.w11, D211.AppIIIc.w12)
  • Inexpensive. (D10)
  • Low maintenance requirement. (D10)
Notes
  • May be set to operate for about two weeks before refuelling is required. (D10, D160.App3.w11)
  • More effective if multiple exploders are used in an area. (D135.3.w3)
  • More effective if moved every one to four days - even movement by 15 to18 m (50 to 60 feet) may be sufficient. (D135.3.w3)
  • More effective if used together with other hazing methods. (D211.AppIIIc.w12)
Complications/ Limitations / Risk
  • Rapid habituation - usually two to three days if used as sole means of hazing, may be as low as a few hours for some species. (D10, D160.App3.w11)
  • Less effective against resident, well established species. (D135.3.w3)
  • Not very effective against some species (e.g. loons Gavia spp., grebes, gulls, coots, many shorebirds). (D10, D160.App3.w11)
  • Significantly reduced effective range in foggy or windy conditions. (D10, D160.App3.w11)
  • Difficult to install and operate in bad weather conditions and on open water. (D10, D160.App3.w11)
  • In areas to which the public have access they may be subject to vandalism or theft. (P12.10 - The Management of Problems caused by Canada Geese - A Guide to Best Practice)
Equipment / Chemicals required and Suppliers
  • Propane cannon.
  • Propane gas.
    • A 5 lb propane tank provides sufficient gas for about 12,000 explosions, which will give one explosion every four minutes for two weeks. (D211.AppIIIc.w12)
  • Raft/boat for use on water. (D10)
Expertise level / Ease of Use
  • Simple to install and operate. (D10)
  • Potentially dangerous. Should only be used by trained personnel. (D160.App3.w11)
Cost/ Availability
  • Inexpensive to buy and maintain. (D160.App3.w11)
  • Widely available. (D160.App3.w11)
Legal and Ethical Considerations
Author Debra Bourne
Referee --
References B36.4.w4, B127.12.w12, D10, D135.3.w3, D160.App3.w11, D211.AppIIIc.w12 P12.10 - The Management of Problems caused by Canada Geese - A Guide to Best Practice

Return to Top of Page