With the release of the new JTM L-39 full composite EDF Jet for 90mm Fans imminent, the guys from Jet Teng Models have released a few more pictures and 2 new videos of the L-39 Prototype in Breitling Colors.
The 2 pictures show close ups of the L-39 cockpit area. The factory pilot fabricated a simple custom cockpit for the plane. This cockpit will NOT be included in the production models as of now. But we are confident that a cockpit kit for the L-39 will be released in the near future once the demand for such an accessory becomes apparent to JTM.
Stay tuned for more updates. In the meantime enjoy the videos of the brake tests and the custom installed lighting kit
Jet Teng will be releasing the Hawk in 5 additional color schemes soon. The Hawks in their new colors come with the same features as the already released Black RAF100 Squadron, Red Arrows and T-45 Color scheme. Please contact us at sales@rc-warbirds.com to place your order for these great models.
We just got news from Jet Teng that the initial color options for the soon to be released L-39 Albatros have been selected. RC-Warbirds.com will stock the L-39 as soon as it is available. As with the Hawk we expect initial production shortages. Contact us today if you would like to pre-order the model.
Following are the initial available color options:
The new 100mm and 90mm Fans by Stumax are in the final stages of development.
Here is a short preview by Stu:
Stumax is currently finalizing the development of two new fans, designated SM100-45 and SM90-45, being 100mm dia and 90mm dia with 45mm hub dia. As there is a demand for a good sounding 90mm fan for a while now, Stu originally tried trimming down an SM110-52 to end up with a 90mm fan unit. However it became quickly apparent that this approach resulted in a too heavy fan unit. At the end Stu designed the SM100 around a SM110-45 motor tube, utilizing the same strator design but with shorter blades to end up with a 100mm fan unit. The goal for the 100mm fan was 5kW using a Neu 15 series motor. Testing shows that the power vs rpm calcs were pretty close, and a 1521-1.5Y on 12S seems to be a good choice, needs a lot of flight testing to confirm, of course. For the SM90-45 it looks like a 1515-2Y will be a good choice on 12S for 3kW, or perhaps a 1515-1.5Y on 8S – again, this needs to be thoroughly tested before these figures are put in stone.
The rotors are 11 bladed, with the blades being individually injection moulded from long glass filled Nylon. the blades are assembled onto front and rear rings which lock them all together. Once the rotor is assembled, it is attached to a shaft adapter which then mounts to a dummy shaft in the lathe, then the front face is machined flat and the bore at the front is machined out to accept the aluminium ring which forms the locating face for the spinner. A lot of work and fiddling, but this ensure the spinner runs 100% true. As assembled, the rotors are close to being perfectly balanced, and I’ve actually run them without further balancing. Production rotors will be dynamically balanced. Thrust-wise, the SM100-45 is matching the 110mm fans up to 3.8kW then it tails off a bit as expected. On 3.8kW it delivers 6.0kg thrust. The static efficiency is up around 92-94%, which is staggering, really, and the reason it’s performing close to a fan with much more FSA. The SM90-45 is giving just over 10lb static thrust with just under 3kW, which is still pretty good considering it’s a cut down rotor and loses the aerodynamic tricks that have been used at the blade tips.The FSA for the SM100-45 is 6264sqmm and 4771sqmm for the SM90-45.
The SM90 is basically the SM100-45 rotor trimmed down to 90mm, using the same motor tube and a 90mm dia shroud. Also new are the shrouds of both the SM100 and SM90 which are carbon/Rohacell sandwich construction at this point. Sound-wise, the SM100-45 is quieter than the SM110-52 but the sound isn’t as interesting, simply because the SM110-52 was designed to have certain pleasing harmonics, and the SM100-45 was designed to be super efficient (hence its quietness).
Release date: Well, Stu is not promising a release date but he hopes to have the first batches done within one month. As with all Stumax products the fans will only be released once they are 100% right.
RC-Warbirds will carry the SM100 and SM90 as soon as they are available. Please drop us an email for more info’s and pre-orders.
Jet Teng is working with high pressure on their latest full composite EDF jet for 90mm Fan units.
The L-39 Albatross will have the following dimensions:
Length: 1380mm
Wing Span: 1075mm
Like the JTM Hawk, the L-39 will come pre-painted (final color schemes will be announced soon) and retract ready.
We will post updates of the new model as soon as they become available.
For the time being, a short video of the L-39’s first ever flight by the JTM factory pilot.
Some info on the full size plane:
The Aero L-39 Albatros is a high-performance jet trainer aircraft developed in Czechoslovakia to meet requirements for a “C-39″ (C for cvičný – trainer) during the 1960s to replace the L-29 Delfín. It was the first of the second-generation jet trainers, and the first turbofan-powered trainer produced, and was later updated as the L-59 Super Albatros and as the L-139 (prototype L-39 with engine Garrett TFE731). The design is still produced in an evolved state as the L-159 ALCA, while more than 2,800 L-39s still serve with over 30 air forces around the world. The Albatros – the most widely used jet trainer in the world – is versatile, seeing duty in light-attack missions as well as in basic and advanced pilot training.
Another great project by Rolf. This FlyFly F-100 Super Sabre was build, primed and then repainted by Rolf.
The Model features retracts, oleo struts, a 90mm EDF unit, full lighting kit incl. afterburner simulation. Some aftermarket scale parts have been added in order to improve the look of the model.
Some info on the full size plane: The North American F-100 Super Sabre was a supersonic jet fighter aircraft that served with the United States Air Force (USAF) from 1954 to 1971 and with the Air National Guard (ANG) until 1979. As the first of the Century Series collection of USAF jet fighters, it was capable of supersonic speed in level flight. The F-100 was originally designed as a higher performance follow-on to the F-86 Sabre air superiority fighter.
Adapted as a fighter bomber, the F-100 would be supplanted by the Mach 2 class F-105 Thunderchief for strike missions over North Vietnam. The F-100 flew extensively over South Vietnam as the Air Force’s primary close air support jet until replaced by the more efficient subsonic A-7 Corsair II. The F-100 also served in several NATO air forces and with other US allies. In its later life, it was often referred to as "the Hun," a shortened version of "one hundred."
Building the Hawk was a joy. All components have a superb fit and the high prefabrication of this model basically means you only need to fix your servos, fan and radio and you are ready to go.
The total weight ready to fly is 3.8kg. With the power supplied of by the DS-51/Lehner combination the plane performs beautifully in the air.
This is a picture of the retract position of our model. As the CG is at 115mm from the forward wing mount, the retracts could be installed a little bit further forward, making it easier to hide them fully in the wing.
Some info on the design of the full size plane: The Hawk is a tandem two-seat aircraft and has a low-mounted cantilever monoplane wing and is powered by a non-augmented turbofan engine. The low-positioned one-piece wing was designed to allow a wide landing gear track and to enable easier maintenance access. The wing is fitted with wide-span, double-slotted, trailing-edge flaps for low-speed performance. Integral to the wing is 836 litre (184 imp gal) fuel tank and room for the retractable main landing gear legs. Designed to take a +8/-4 g load, the original requirement was for two stores hardpoints but it was designed to fit four hardpoints by Hawker Siddeley.
The fuselage design was led by the need to get a height differential between the two tandem cockpits, this enabled increased visibility for the instructor in the rear seat. Each cockpit is fitted with a Martin-Baker Mk 10B zero-zero rocket assisted ejection seat. The centre fuselage has an 823 litre (181 Imp Gal) flexible fuel tank. The two-shaft turbofan Rolls-Royce Turbomeca Adour engine is fitted in the rear-fuselage with inlets on each side above the forward wing roots. A ram air turbine is fitted just in front of the single fin as well as a gas turbine auxiliary power unit above the engine. The forward retracting nose landing gear leg is fitted in the nose.
The air brake, located under the rear fuselage.
Performance
The Hawk was designed to be maneuverable and can reach Mach 0.88 in level flight, and Mach 1.15 in a dive, thus allowing trainees to experience transonic flight before advancing to a supersonic trainer.sIts airframe is very durable and strong, stressed for +9 g, but the normal service limit in RAF service is +7.5/-4 g.
Watch the video of our maiden flight…….
Disclaimer: The aileron throws we used where much to much……hence the high roll rate and overcompensation during take off.
Another one of Rolf’s builds. This is a SAPAC JAS 39 Gripen, build and modified by Rolf. The model is completely glassed and painted. Decals are from Tailormade Decals. The plane features a 90mm EDF unit and retracts.
Rolf has installed full navigation and landing lights as well as a burner emulation.
Some info on the real plane: The Saab JAS 39 Gripen (English: Griffin) is a lightweight multirole fighter aircraft manufactured by the Swedish aerospace company Saab. Gripen International acts as a prime contracting organization and is responsible for marketing, selling and supporting the Gripen fighter around the world.
The aircraft is in service with the Swedish Air Force, the Czech Air Force, the Hungarian Air Force and the South African Air Force, and has been ordered by the Royal Thai Air Force. A total of 236 Gripens have been ordered as of 2008.
A few pictures of Rolf’s Jet Arrows Mirage 2000B.
The model features Behotec retracts with Jet1A oleo struts, a 90mm carbon fan and a NeuMotors 1512-2.5D, YGE BEC ESC and 6S Lipo.
The model is painted and covered with 2k clear. Decals are from Tailormade.
Current draw is around 90A. The model is capable of taking off from a grass runway and flies like a rocket.
As all of Rolf’s models also the Mirage 2000B features a full lighting system with after burner emulation.
Some info on the full size plane: The Dassault Mirage 2000 is a French multirole, single-engine fourth-generation jet fighter manufactured by Dassault Aviation. It was designed as a lightweight fighter based on the Mirage III in the late 1970s for the French Air Force. The Mirage 2000 evolved into a successful multirole aircraft with several variants developed. The variants include the Mirage 2000N and 2000D strike variants, the improved Mirage 2000-5 and several export variants.Over 600 aircraft were builtand it is in service in nine countries as of 2009.
Just added: A video of the Mirage 2000 in action. Enjoy
