vehicles), India is now also looking at designing solar-powered spy
drones which can cruise in the sky for several days at a time.
The high-altitude, long endurance (HALE) solar-powered UAV will not just
reduce Indian military’s carbon footprint but more importantly provide a
cost-effective and flexible 24×7 ISTAR (intelligence, surveillance,
target acquisition and reconnaissance) platform akin to “a
pseudo-satellite” orbiting closer to the ground.
“Yes, Army and IAF have asked us to develop the solar-powered HALE
UAV. Initial work is in progress for such a drone which can undertake a
15-day continuous flight over 30,000-feet,” DRDO’s chief controller
R&D (aeronautics) Dr Prahlada told TOI.
The drone will harvest solar energy during the day, storing it in fuel
cells to provide power for electric motors for night flying. “Solar
efficiency is low but we are looking at a payload of around 50 kg
(sensors, cameras etc). We will seek some collaboration from either US
or European companies,” said Dr Prahlada.
This comes at a time when several international aviation majors are
doing cutting-edge research on solar UAVs. Boeing, for instance, is
developing a UAV with a 400-feet wingspan, called Solar Eagle, which can
operate continuously for an astonishing five years. It is being
described as a “zero-maintenance, launch-and-leave UAV”.
With remotely-piloted spy as well as combat drones being seen as major
force-multipliers or game-changers in modern-day warfare, DRDO has
launched a series of UAV programmes for Indian armed forces, which have
largely depended on Israeli drones like Searchers and Herons till now.
As was first reported by TOI recently, this includes the secretive AURA
(autonomous unmanned research aircraft) programme to develop UCAVs
capable of firing missiles, bombs and PGMs (precision-guided munitions).
The Cabinet Committee on Security has also now cleared a Rs 1,500 crore
DRDO project to develop the Rustom-H MALE (medium-altitude,
long-endurance) drone, capable of operating for 24 hours with a 350-kg
payload. “Its first flight will take place in two years,” said Dr
Then, of course, there is the smaller Rustom-I drone, with an 8-12
hour endurance and a 100-kg payload, as well as the already-developed
Nishant UAV, which has a 4.5 hour endurance level.
Army, in fact, has projected a requirement of seven “troops” (akin to
squadrons) of Rustom drones. As for Nishants, Dr Prahlada said, “Army
has already inducted four such drones, which can be launched from
hydro-pneumatic launchers without the need of runways, while eight more
are being manufactured.”
“Nishants can carry electro-optical, electronic intelligence and
communication intelligence payloads. Since they can also be used for
counter-insurgency operations, the home ministry has also expressed
interest in seeing their operations,” he added.
With DRDO working on the entire spectrum ranging from hand-held mini to
full-fledged combat drones, a dedicated aeronautical test range from
them is also coming up at Challakere, around 220 km from Bangalore. “It
will be fully operational in two years,” he said.