You can find information at this website:
http://www.atsb.gov.au/publications/...s_20050055.pdf
This from a WSPS manual:
The capability of the WSPSâ to protect against
damage due to a wire strike has been
demonstrated by Bristol Aerospace Limited
through extensive ground tests using a truck–
mounted helicopter fuselage and various wires
and cables, including a single span 10M (10,000
lbs. minimum breaking strength) cable and a
combination of a 10M and a polyethylene shielded
communications cable (100 pair, 24 gauge
insulated copper wire). These tests were
conducted at various speeds up to 60 miles per
hour.
The effectiveness of the WSPSâ to protect
helicopters against wire strike damage involving
wires and cables commonly used in the North
American rural environment was verified by the
U.S. Army through pendulum–swing tests
conducted at the NASA Impact Dynamic Test
Facility at Langley, Virginia. Tests against a
single span of an 11,000 lb. minimum breaking
strength steel cable were conducted using the
OH–58A, UH–1, OH–6A, AH–1S, UH–60, and
AH–64 helicopters. Swing tests against multiple
spans of electrical and communications cables
with combined strength in excess of 23,000 lbs
were conducted using the OH–58A helicopter.
These tests were conducted with the helicopter in
a horizontal position at time of cable impact. The
test results for the OH–58A are presented in U.S.
Army Applied technology laboratory report No.
USAAVRADCOM–TM–80–D–7, entitled
“Investigation of Helicopter Wire Strike Protection
Concepts”, dated June 1980.
The effectiveness of the WSPSâ to protect
helicopters against wire strikes involving wires
commonly used in the European rural
environment was verified by Aerospatiale
helicopter division through ground wire strike tests
conducted at the French Army CEV/Istres test
facility. A truck–mounted, WSPSâ equipped
Gazelle helicopter was driven into three spans of
Aster 147 electrical cables (.625” diameter, 19
strand aluminum electrical conductor) with
combined tensile strength of 32,100 lbs. The test
results are documented in Aerospatiale report
341A.06.2479.JdG, dated 1 October 1986.
Flight tests are conducted to determine the effect
on aircraft handling characteristics and radio
disturbances, etc., by various military and civilian
authorities on WSPSâ equipped helicopters for
the purpose of product certification. No in–flight
wire strike tests to verify the system capability
have been conducted.