Original scientific paper
The tactics of firefighting and stability analysis of helicopters equipped with water cannon
Danijel Vuković
; GS OS RH, HKoV, Zapovjedništvo za obuku i doktrinu “Fran Krsto Frankopan”, Pukovnija PZO
Milan Vrdoljak
orcid.org/0000-0002-2948-3523
; akultet strojarstva i brodogradnje Sveučilišta u Zagrebu, Zavod za zrakoplovstvo
Josip Rašić
Abstract
Fire extinguishing with system of water cannon is proved very reliable in urban or remote areas as well as on the ships at sea, where precise water action is required. Because of the overall both technical and operational features of helicopter and water cannon, several different tactics for firefighting are developed and practiced. Depending on the mode of the water cannon operation, on a helicopter may act both impulse and continualy developed forces and moments which affect the overall performance of the helicopter and can lead to degradation of flying safety. While working in a variety of tactical conditions, water cannon may additionaly cause degradation of stability and handling quality of helicopter.
Helicopter equipped with water cannon firefighting tactics may be out of position from hovering or progressive flight. Generarly, water cannon may be able to shift both in azimuth and in elevation. Installation of a cannon on a helicopter can be done in two ways - under the helicopter fuselage parallel to its longitudinal axis or inside the passenger or cargo space when the cannon is mounted sideways.
Applying a linear model of helicopter with a water cannon, the effect of a water cannon with impulse and continuously jet on helicopter is analized. The mathematical analysis of stability will be considered on generic transport helicopter with a conventional configuration, which is equipped with single-tube water cannon mounted on the longitudinal axis of the helicopter and in both impulse and continuously jet action regimes.
Keywords
water cannon; linear model of helicopter motion; stability of the helicopter; firefighting tactics from the air
Hrčak ID:
106745
URI
Publication date:
25.7.2013.
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