The JS2 Revenant
18m/21m flapped self-launcher
The JS2 Revenant, high-performance 18/21-metre sailplane.
Pilots can select the JS2 as a pure sailplane, or have a choice of propulsion systems:
- The Solo fuel injection self launcher system, or
- The MD-TJ 42 jet sustainer system
The JS2 is designed to be a world class glider for the “every-day” pilot in an airframe that
has proven its pedigree in the highest level of competition.
Not only is the JS2 designed to be an ultimate high performance, high speed racing machine, but includes features that make ease of operation during flight, ground handling and maintenance a pilot’s dream.
3-VIEW AND TECHNICAL DATA
|Wing area||11.19 m²||120.45 ft²|
|Maximum Weight||650 kg||1433 lbs|
|Empty Weight||388 kg||855 lbs|
|Wing area||12.25 m²||138.86 ft²|
|Maximum Weight||720 kg||1587 lbs|
|Empty Weight||400 kg||882 lbs|
Designed with the same proven high performance airfoil sections as the JS1 wings, combined with a new optimized fuselage design, the JS2 will be highly competitive in the 18m configuration.
Jonker Sailplane’s unwavering dedication to streamlining and drag reduction is once again underscored by the introduction of a completely new fuselage which includes a retractable / steerable tailwheel design for improved ground manoeuvrability expected on a self-launch sailplane.
In the 21m configuration, it is a serious contender in the open-class.
Performance and Speed specifications
|Minimum sink||0.5 m/s||100 ft/min|
|Sink rate & 200 km/h||1.58 m/s||311 ft/min|
|Max Wing loading||58.1 kg/m²||11.9 lbs/ft²|
|Min Wing loading (90 kg pilot)||42.7 kg/m²||8.7 lbs/ft²|
|Water ballast capacity||187.5 l||49.5 US gal lqd|
|Minimum sink||0.48 m/s||95 ft/min|
|Sink rate & 200 km/h||1.44 m/s||283 ft/min|
|Max Wing loading||58.7kg/m²||12.4 lb/ft²|
|Min Wing loading (90 kg pilot)||40.0 kg/m²||8.2 lb/ft²|
|Water ballast capacity||221.5 l||58.5 US gal lqd|
Standard Performance Features
- Control surface gaps sealed with the Streifeneder Teflon/Mylar
- Boundary layer is controlled with blowholes and soft tripping
- Cockpit airflow controlled with an air extractor
- Integrated bug wiper garages
- Total energy and Pitot-static probes by Airsense fitted to fin
- Integrated water ballast tanks in main wings – 180 l (47.5 gallons)
- Retractable/steerable tailwheel
Optional Performance Features
- JS bug wipers operated by the On-Track programmable automatic
As with all JS’s products safety is not negotiable and formed an integral part of the JS2’s design process. By going through multiple iterations for the structure of the
fuselage the weight of the glider was reduced to the bare minimum, but still adheres to the minimum requirements of CS-22.
A standard fire warning system ensures that the pilot is made immediately aware of a possible fire, ensuring that necessary action can be taken straight away.
A bail-out system is becoming a more and more essential safety feature for glider pilots. Great effort and time by JS’s design team has gone into designing and developing a reliable and state of the art emergency bail out system for the JS2.
The bail out system will be optional for all JS’s products
|Max speed Vne||280 km/h||151 kts|
|Max rough air speed Va||203 km/h||110 kts|
|Max aerotow speed Vt||180 km/h||97 kts|
|Max decent rate MAUW||50 m/s||9842 ft/min|
|Cockpit crash resistance||9G||9G|
Standard Safety Features
- Automatically controls, including the water system
- Flarm™ collision-avoidance antenna in fin
- Warning limit switches for landing gear & airbrakes
- Water dump sensor
- Hydraulic disc brake activated by a dedicated brake lever on control stick
- Powerful airbrakes, lockable in different settings
- Dynafoam™ energy-absorbing seat cushion
- MH AL-248 O2 cylinder holder with quick release
- Fire warning system
Optional Safety Features
- Dolba transponder antenna in the vertical fin
- Flarm™ collision-avoidance antenna in front of vertical fin for maximum view
angle and range
- Emergency bail-out system
COMFORT AND FEELING
The cockpit will be of similar layout as the JS3 – the largest performance glider cockpit in its class. Including easily removable covers for maintenance and sufficient space for additional oxygen.
Extensive time and effort has gone into designing a cockpit that has the space requirements the pilot needs but not compromising/impeding performance.
During the entire design phase of the aircraft the maintainability of the airframe received significant input and attention to ensure access to controls, electrical system
and the engine system.
The following features have been redesigned from previous models to ensure the pilot has an even more comfortable flying experience:
In addition the canopy mechanism has been improved to accommodate hot and cold conditions. The design ensures that the canopy front lip always closes, improving the performance of the glider by allowing undisturbed flow of air over the canopy.
Larger areas for the handles to turn on ensure smoother operation. Cut-outs in frame improve serviceability of the internal components. Designing floating rear supports in the cockpit frame to allow for temperature differences on the ground but allowing for the canopy to return to the optimal position once cooled down in the air.
The JS2 Water System
The fundamental improvements on the JS2 water system includes increase in torsional stiffness of the tubes between the outboard section and the inboard section and increased travel range for the outer tips allowing for faster dumping of ballast. This also reduces the required travel in the fuselage to activate the water system. The water system doesn’t function sequentially but independently from one another between the outer and inner panels.
The design allows for both the inboard dump valve as well as the outer dump valve to be pushed up independently when dumping of water from one of the tanks is required.
Increase in Instrument Panel Area
The instrument panel has been moved closer to the pilot for make the reaching of the instruments
easier. This change has made it possible to increase the area of the instrument panel slightly
compared to the JS3. The amount of shade on the intrument panel has been increased by
increasing the lip length of the coaming.
Changing the routing of the wiring from the side channel to below the binnacle
allows easier access for maintenance and less tension on the wires routed to the
binnacle. This method also allows for a dedicated pathway for venting.
Seat back adjustment
The seatback adjustment design has been changed to allow the pilot adjustment
while in flight the geometry of the attachment points have also been changed to
ensure easier movement of the seatback in its lower attachment points by
changing the attachment surfaces to parallel.
The rerouting of the electrical wiring has made it possible to incorporate a dedicated venting
channel with the shortest route from the source of the air to the binnacle. The design
intention is still to allow for the airflow to help with the cooling of the intruments while
providing the pilot with demisting of the canopy in humid conditions. The demisting valve is
operated manually in the same way as the JS3 (from the instrument panel with a push pull
|Max Cockpit weight||115 kg||254 lbs|
|Maximum size pilot||2.03 m||6ft 8"|
|Airbrake locking forces||-15 daN||-33.7 lbf|
|Cockpit shoulder width||525 mm||20.7 inch|
|Landing gear retracting forces||-15 daN||-31.5 lbf|
|Inner wing panel weights||<80 kg||17.6 lbs|
Standard Features for your comfort
- In-flight electrically adjustable rudder pedals
- Ground adjustable seatback with headrest
- Canopy side window with air scoop
- Green tinted canopy for increased UV protection
- Forward opening canopy for comfort
- Cockpit side vent with ventilation control
- Leather cockpit interior upholstery with storage pockets
- Tool bag with assembly grease and rigging tools
- Canopy cover, tail dolly
- Heated boots
- Serviceable tail battery
The development of the JS2 Self Launcher was not about the development of a self-launching glider based on the highly successful JS1.
The original idea – to build a new fuselage with enough space to fit a SOLO 2650 engine grew in scope until the glider is now unrecognisable from the original JS1. This is because as the JS1 self-launcher developed, Jonker Sailplanes developed as a company. For a time, the development of the JS2 was stopped in order to design, certify, industrialise and produce the JS3. However the development and production of the JS3 meant that even more lessons were learn before returning to the JS2 (this during a span of 4 years).
The JS design team believes in a perfectly compromised design, taking into account
all of the aspects of what makes a glider a superior product and balancing this to achieve the best designed glider in the world.
*Performance, masses and figures are estimations based on theoretical data only and may change without prior notification.