Artistic illustration K.P.S.-2903 "Yetos" © Konstantinos Panitsidis

 Technical specifications      Photos      Video


Master thesis of Konstantinos Panitsidis

Every summer, from the firefighting aspect, is expected with a sense of anguish and nervousness. It's the season that puts the whole firefighting system to the test, due to the many fires this period of time, especially in Southern countries, like Greece. 

The results of the previous season becomes the new reference point in forecasting, planning and applying the available forces in the best way, based on conclusions of previous actions.

The last years have been really devastating in losses of forests, plantations, animals and even human lives.

The pertaining problems prove that a new approach to the problem is necessary. A whole new strategy in firefighting must be planned and implemented, which will redefine the technical means, the human resources, the goals even the legal considerations that must be made.



This problem becomes more crucial for Greece, especially if we consider that we have the lowest forest percentage coverage of all other European countries: about 13%, when in Spain it's 33%, in Bulgaria 32% and in Italy 22%. Another crucial fact is that every year reforestation covers only about 1/8 of the burned areas.

Firefighting airplane YETOS 2903 can perform from land, sea, lakes and rivers. It can also perform from unprepared airways and snow, if the special ski system is installed. It can also be filled with water at the airport. It's designed to withstand loads up to 3.5 g, with a safety coefficient of 1,5. It's equipped with two turboprop TV7-117 engines of 2,700 hp each during take off, while the continuous full power is about 2,400-2,600 hp. Firefighting missions are not the only ones this airplane can perform. It can also be used as passenger plane, cargo, air-ambulance, coast guard patrol, search and rescue, etc.


K.P.S.-2903 "YETOS" Firefighting aircraft ( Multipurpose amphibian aircraft). Scale 1:50. © Konstantinos Panitsidis


Statistics show that turboprop firefighters have a denser water drop print than turbojet airplanes, due to their lesser speed and better drop control. The aircraft is equipped with an airconditionning to make the pilot's work more comfortable and thus, effective. The water tanks have a total volume of 6,000 kg.


Four-View Drawing K.P.S.-2903 "YETOS"  


The cockpit is fully digitized, with wide, easily read monitors, sensors that help pilots better regulate the water drops, navigation instruments, radio-communications to coordinate with ground forces, special wind shields to protect them from direct sunlight and reflections etc.


Control wheel K.P.S.-2903 "YETOS" 



Control wheel K.P.S.-2903 "YETOS" 





The crew consists of 3 members (2 pilots, 1 engineer). There are also seats to accomodate 8-10 passengers in the cabin. The hull of the plane has 2 hydraudynamic steps. The second one provides better control on water and better water sliding. Lengthwise the fuselage is divided in three water-tide sections.


K.P.S.-2903 "YETOS" Firefighting aircraft (Multipurpose amphibian aircraft)


The first section holds the cockpit, the radio equippement and other systems of the plane. The two water tanks (6,000 kg) and the toilet, are located in the second section of the aircraft and so is the engineer. The third section has an area for luggages, post and other stuff.


Fuselage sector K.P.S.-2903 "YETOS"



Fuselage sector K.P.S.-2903 "YETOS"



The profile of the wing is NACA - 2415. It's all made of metal and has two langerons.
It's shape is trapezoidal and at the wing tips it has two floaters for better on-water stabilization.  


NACA 2415


Power plant
The aircraft is equipped with two turboprop TVD7 – 117 engines (or a western analogue), with a 2,623 horse power each. The propeller has 6 wings and a diameter of about 3 meters.


Landing system
The landing system is a three point retracted one, with two-chamber air amortizes. The wheel base is 6.00 meters and the whell track is 4.95 meters. The aircraft is equipped with a three point retractable landing system, with 2-chamber air-pressured dumbers.
The main gears are retracted in the fuselage with the wheels uncovered.
The nose gear retracts upwards and is fully covered by two doors.


Various Aircraft systems

K.P.S.-2903 "YETOS" Firefighting aircraft (Multipurpose amphibian aircraft). Scale 1:50


Hydraulic system
The hydraulic system is of closed type and consists of the main and the emergency one. The main one serves the landing system, the brakes, the water probes and the ailerons. The emergency one covers the landing system, the water probes retraction and the brakes in case of malfunction of the main hydraulic system.

Fuel system
The aircraft's fuel tanks are located inside the wing. Each one is consisted of 8 flexible containers (cells), placed in between the langerons of the wing.

Defrosting system
A defrosting system is used against frost formation on the wings and tail, by pressured air flow.

Engine fire extinguishing system
The engine fire extinguishing system has two extinguishing zones. Zone 1is the region before the engine στηρίγματα and Zone 2 behind it. Zone 2 though is also divided in two regions: Fore Zone-2 and Aft, Zone-2, but extinghuishing in zone 2 is made in both of them at the same time.

Lubricant system
The lubricant system is used for engine lubricating and cooling. The tank is located by the engine's side and the volume is 30 ltr.

Radio and navigational equipment
The plane is equipped with - VHF, UHF UHF/FM , VOR , ILS, IFF, and RADIO COMPASS. The exact configuration is depended on the mission and the type of the aircraft.

Radar, infrared search system.

The aircraft, since it's designed for rapid response against fires, has two large tanks, able to be filled with sea water and deliver it on target. It's also able though, to be filled on airports, from two points. The water dropping system is controlled electrically and works hydraumechanically. The tanks and the airplane itself, has undergone a special process of anticorrosion covering. A small window allows for the inspection of thw water tanks. Water displacing of the water during flight, is minimized due to diaphragm inside the tanks. Every tank has a pressure release tube to expell overloaded water.


K.P.S.-2903 "YETOS" Water Bak


NOTE:The water tanks are located at the gravity center of the airplane, minimizing thus, the work of the trimmers, balancing the craft, during water intake and releasing. Water draining taps, allows for the full drainage of the water tanks.

NOTE: The maximum speed of the aircraft on water during water intake is about 80-90 KNOTS.

The needed time of water gliding for the two tanks, (total volume of 6,000 kg of water), is just about 10 to 15 seconds (depending on the water surface state) and is done with a speed of about 130-150 klm/h. The filling of the tanks is done through two special probes which extend a little under the fuselage hull.

Upon touching the water surface with the necessary speed, the filling of the tanks is done due to inertia. When the tanks are full, but the probes remain submerged, the excessive water is expelled through a special drain tube on top of the tanks. 





Panitsidis Κ. (K.P.S.-Project)
Firefighting aircraft
2 turboprop engineTVD7-117 (P&W 123 AF).
Power h.p.
2 x 2.623
Length, m
Height, m
Wing span, m
Wing area m2
Maximum take-off, kg
Normal take-off, kg
Empty aircraft, kg
Internal fuel, kg
Maximum speed, km/h
Cruising speed, km/h
Service ceiling, m
Range, km
Combat range, km
Payload, kg


PHOTOS K.P.S. - 2903 "YETOS"