IAI Scout

The Scout combined an unmanned reconnaissance aircraft with a ground control system, allowing Israeli commanders to receive imagery without exposing a pilot to enemy air defenses.[4] Its battlefield role included locating missile batteries, transmitting target information and observing the results of attacks.[4][6] In Israeli service it was called Zahavan, while Scout was the name used in accounts of its development and international influence.[2][5]

The aircraft was larger than, but similar to, the Tadiran Mastiff, the first Israeli battlefield UAV, introduced in 1975.[3] The Scout used a twin-boom configuration with the propeller between the booms, a layout that became a model for later drones.[6] Its importance lay particularly in the transmission of current battlefield information: during the Lebanon campaign, it supplied target locations to the air force in real time rather than requiring commanders to wait for photographic film to be developed and analyzed.[7]

After the 1973 Yom Kippur War, IAI engineers sought ways to gather intelligence without exposing pilots to enemy air defenses.[4] Israel already had experience using UAVs for photography during the 1960s and 1970s, later extending their use to deception and intelligence gathering.[8] The air force approached IAI to develop an aircraft resembling those used by military intelligence; the resulting system was the Scout.[2]

Development took place during the 1970s, with an army order placed in 1977.[6][7] A team led by David Harari was operating by that year, confronting the linked problems of building an unmanned aircraft and its ground control system without an existing operational model to copy.[4] Team members included an expert in flying toy airplanes who had worked with Shabtai Brill, hang-glider pilot Kobi Livni, and Danny Noy, whose experience included missile development in France.[4]

Keeping the aircraft light enough to reach the air force’s required altitude of 10,000–15,000 feet was an early engineering challenge.[4] Livni adapted a 10-horsepower chainsaw engine for the first five prototypes.[4] The development team’s first flight took place in 1979 near Kibbutz Ein Shemer.[4] A subsequent test ended in an orange grove, damaging crops for which IAI compensated the farmer; further successful trials preceded preparations to hand the first systems to the air force.[4]

Landing presented another obstacle: air force commander Maj.-Gen. David Ivry initially declined to accept a system that needed a 400-meter runway to stop.[4] Rather than add the weight of conventional brakes, the engineers devised a landing hook and cable system.[4] In October 1980, the air force received four Scout aircraft and a control room housed in a mobile caravan.[4] The aluminum aircraft measured 3.7 meters in length and had a wingspan of 2.8 meters.[4] The Scout entered Israeli Air Force service in 1981 as its first operational UAV.[9]

At a large Israel Defense Forces exercise in Sinai in March 1981, Scout imagery exposed a planned surprise: a bridge was to be removed before troops reached a simulated canal.[4] Exercise commander Ehud Barak, initially skeptical of the aircraft, subsequently told Harari: “This is information that comes in real time and can win a war. This little toy of yours can influence the outcome of a war.”[4] South Africa’s defense force also deployed the Scout on combat missions in 1981, before its use by Israel in the following year’s Lebanon War.[1]

Before the 1982 war, Israeli Scouts photographed Syrian missile batteries in Lebanon’s Bekaa Valley, sometimes employing flight techniques intended to conceal their radar signature.[4] They also operated during airstrikes on terrorist bases, tracking where people went afterward and helping identify additional targets.[4] Syrian MiG-21s, followed by older and slower MiG-17s, were sent to locate the aircraft but failed to find them.[4]

On June 9, 1982, Israel attacked Syrian air-defense systems in the Bekaa Valley in Operation Mole Cricket 19.[4] Scouts supplied the air force command with missile-battery locations and could indicate whether a battery was moving while a weapon was already in flight.[4] All 19 Syrian missile systems in the valley were destroyed that day, with drones playing a central role in the operation.[4] Ivry later recalled: “Without drones we would not have been able to attack the SAMs.”[4] The Scout and Mastiff were effective in identifying and locating surface-to-air missiles and marking them for destruction during the campaign.[3]

The Scout operated within a wider Israeli unmanned-aircraft effort: by 1982, Israeli-developed, ground-launched mini UAVs were providing tactical intelligence.[10] Locally produced mini remotely piloted vehicles sent real-time intelligence to air-force and battlefield commanders during the Lebanon War.[11] In Operation Mole Cricket 19, small and large UAVs worked together, while propeller-driven aircraft reported enemy aircraft takeoffs and the condition of air-defense batteries before and after attacks.[2]

In another Scout operation, an operator detected an SA-8 surface-to-air missile system concealed beneath a tree in Syria and contacted a nearby Phantom pilot.[12] The operator directed the pilot to the target, which was bombed and destroyed.[12] A Scout later participated in the 1992 airstrike that killed Hezbollah leader Sheikh Abbas al-Musawi in southern Lebanon, locating his vehicle and reporting the strike’s results back to Israel.[12] The Scout was retired from Israeli Air Force service in 2004.[9]

The Scout’s live video feeds enabled personnel to see bombs hitting targets, joining reconnaissance and observation of attack results within the same system.[6] Its transmission of target locations in real time contrasted with the earlier process of taking aerial photographs, developing the film and then analyzing the images.[7] The aircraft’s twin-boom configuration, with the propeller between the booms, also became a recurring model for later drone designs.[6]

The U.S. military sent a delegation to Israel to obtain information about the Scout.[6] More broadly, American observers noticed Israel’s successful UAV operations in Lebanon in 1982, encouraging Navy Secretary John Lehman to seek a UAV capability for the U.S. Navy.[13] The RQ-2 Pioneer was modeled on the Scout and subsequently saw extensive American military use during the 1991 Persian Gulf War.[5]

Published accounts describe different milestones in the Scout’s development and entry into service. One report dates development to 1974 and an army order to 1977.[6] Another dates the first flight to 1979 and delivery of four aircraft to October 1980.[4] Globes places operational entry in 1981.[9] These dates may refer to distinct stages—design, ordering, testing, delivery and operational service—but the sources do not explicitly reconcile them.

Technical specifications also vary. The 2020 account describes a full-fuel weight of 135 kilograms and a 17-kilogram camera,[4] while a Globes account gives 220 kilograms and a 25-kilogram camera.[14] The published accounts do not explain whether these figures reflect different configurations or reporting discrepancies.