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Archive February | RC-Warbirds Blog
Feb 28 2010

BAE Hawk – RAF Black

Jet Teng Hawk by RC-Warbirds Our own JTM BAE Hawk in the colors of the RAF Squadron No100.
This full composite model was designed for 90mm Fan units and 6-10S Lipo Power.

Our Hawk features:
- Schuebeler DS-51 Fan
- Lehner 1940-12HA
- Hyperion 90 ESC
- Hyperion G3 4200 8S 35C Lipo packs
- JTM Retracts
- JTM Oleos with Wheels

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.

JTM Hawk retract position

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.

Jet Teng Hawk in flight 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.

RC-Warbirds bae Hawk JTM

Click Here For More Info On This Plane


New Addition:

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.

Inflight Video – captured with a FlyCamOne2

Feb 27 2010

F-16 Falcon – Black Knights

Ernest Skymaster F-16 with Stumax

Simply amazing.
This is Ernest’s Skymaster F-16 in the colors of the Singapore Black Knights demonstration team.

This 10kg heavy jet is equipped with a Stumax SM110-52 Fan unit and 12S 5000mAh Lipo packs.
The plane features retracts, working gear doors and after burner emulation with LED’s.

So far only initial taxi tests have been performed. We will update this blog once the first flight has taken place.

skymaster f-16 with sm110-52


Feb 25 2010

F-86 Sabre

HET-RC F-86 Sabre Jet This is our HET-RC F-86 Sabre.
The model is one of HET-RC first epoxy fiberglass models and comes fully pre-painted.

Our F-86 is equipped with the following components:
- WeMoTec Mini Fan 480
- HET-RC Typhoon 2W-18 Motor
- HET 75A ESC
- 3700mAh 4S Lipo
- HET-RC Mini Air Retracts

I decided to install the nose gear steering slightly different then shown in the manual.
I opted for a completely concealed installation of the steering servo.
The servo is now located inside the fan compartment and is glued directly beside the fan against the fuselage of the model.
A balsa block between servo and fuselage wall creates enough space for the servo to move freely.

2 pushrod channels are routed from the fan compartment into the nose and guide the 2 steering wires so that they exit directly behind the retract unit.

Some info on the real plane:
HET F-86 Sabre Airbrush The North American Aviation F-86 Sabre (sometimes called the Sabrejet) was a transonic jet fighter aircraft. The Sabre is best known for its Korean War role where it was pitted against the Soviet MiG-15 and obtained UN air superiority. Although developed in the late 1940s and outdated by the end of the 1950s, the Sabre proved adaptable and continued as a front line fighter in air forces until the last active front line examples were retired by the Bolivian Air Force in 1994.

Its success led to an extended production run of more than 7,800 aircraft between 1949 and 1956, in the United States, Japan and Italy. It was by far the most-produced Western jet fighter, with total production of all variants at 9,860 units.

Variants were built in Canada and Australia. The Canadair Sabre added another 1,815 airframes, and the significantly redesigned CAC Sabre (sometimes known as the Avon Sabre or CAC CA-27), had a production run of 112.


Feb 23 2010

F-15 Eagle

This HET-RC F-15 Eagle in Bicentennial color scheme HET-RC F-15 bicentenialis owned by Keng Leng.
The model is bungee launched and powered by 2 HET Typhoon 3W motors, 2 Jeti ESC and HET 6904 Fan units.

The plane is controlled via tailerons.
Due to the large fuselage the installation of a retractable landing gear is possible.

Some info on the real plane:
The McDonnell Douglas (now Boeing) F-15 Eagle is a twin-engine, all-weather tactical fighter designed to gain and maintain air superiority in aerial combat. It is considered among the most successful modern fighters with over 100 aerial combat victories. Following reviews of proposals, the United States Air Force selected McDonnell Douglas’ design in 1967 to meet the service’s need for a dedicated air superiority fighter. The Eagle first flew in July 1972, and entered service in 1976. The F-15 is expected to be in service with the U.S. Air Force until 2025.

Since the 1970s, the Eagle has also been exported to Israel, Japan, and Saudi Arabia. Despite originally being envisaged as a pure air superiority aircraft, the design proved flexible enough that an all-weather strike derivative, the F-15E Strike Eagle, was later developed, and entered service in 1989.

HET F-15 twin fan


Feb 22 2010

BAE Hawk

Fox Bae Hawk Side

This Fox Composite Hawk was build by us for one of our customers.
The model features a 110mm Stumax Fan, JetiSpin 200 ESC, Air Retracts with Oleo Struts and brakes and will be powered by a 12S Lipo pack. Decals are from Tailormade Decals and are protected by a 2k clear coat.

Fox Hawk retract Initially designed for turbines this model is now flown successfully with EDF Power in various countries.

The Model has a wingspan of 1346mm (53’’) and a length of 1575mm (62’’).

 

Some info on the full size plane:
The
BAE Systems Hawk is a British single engine, advanced jet trainer aircraft. It first flew in 1974 as the Hawker Siddeley Hawk. The Hawk is used by the Royal Air Force, and other air forces, as either a trainer or a low-cost combat aircraft. The Hawk is still in production with over 900 Hawks sold to 18 customers around the world.


Feb 19 2010

JAS 39 Gripen

side view of Rolfs sapac gripen 
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.

SAPAC JAS 39 Gripen by Rolf 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.

Rolfs SAPAC JAS 39 side view


Feb 18 2010

Mirage 2000B

Jet Arrows Mirage 2000B by Rolf 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:bottom view of rolf's mirage 2000B
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 built and it is in service in nine countries as of 2009.

mirgae 2000b fin

Just added: A video of the Mirage 2000 in action. Enjoy


Feb 17 2010

Frecce Tricolori MB-339

FlyFly Aermacchi MB-339 Some pictures of our FlyFly Aermacchi MB-339 in Frecce Tricolori colors.
For this EDF Jet we have chosen the following setup:

  • Fan: WeMoTec Midi Fan Pro (90mm)
  • Motor: HET-RC 600-37-2
  • ESC: HET-RC 75A
  • Battery: Hyperion G3 4200mAh 6S 35C
  • Retracts: Tamjets Mini Air Retracts

With this setup the fan generates around 1.4kW of Power which allows for easy take-offs from concrete and grass fields.

We have further re-enforced the wing with carbon rods to avoid possible wing folding issues.
The carbon rod was inserted in a groove cut into the bottom wing from close to air duct till all the way out to the retract mounts. This as strengthened the area between the outer, factory pre-installed carbon re-enforcements and the wing center section.

FlyFly MB-339 by RC-Warbirds

Some Info on the real plane:
The Aermacchi MB-339 is an Italian military trainer and light attack aircraft. It was developed as a replacement for the earlier MB-326.

The MB-339 is of conventional configuration, and shares much of the 326’s airframe. It has a low, un-swept wing with tip tanks and jet intakes in the roots, tricycle undercarriage, and accommodation for the student and instructor in tandem. The most significant revision was a redesign of the forward fuselage to raise the instructor’s seat to allow visibility over and past the student pilot’s head.

The first flight took place on 12 August 1976 and deliveries to the Italian Air Force commenced in 1979. Still in production in 2004 in an enhanced version with a much-modernised cockpit. Over 200 MB-339s have been built, with roughly half of them going to the Italian Air Force.

The Lockheed-Aermacchi MB-339 T-Bird II was a losing contender in the USA’s Joint Primary Aircraft Training System (JPATS) aircraft selection. Among the seven to enter, the Raytheon/Pilatus entry won, which became the T-6 Texan II.
According to an article posted on the Italian website ‘Il Porto Franci’, called ‘Armi e finanziamenti nel corno d’Africa’, Eritrea paid about $US 50 million for six MB-339 CEs in 1997. This is the original MB-339 with more advanced avionics for the ground attack role, RWR, uprated Viper 680-43 engine, and larger wingtip tanks. It is capable of carrying Sidewinder AAMs, AGM-65 Maverick AGMs, and laser-guided bombs. Unit price of the MB-339C would have to be somewhere around $US 8.3 million in 1997 dollars.


Feb 16 2010

Spark Eliminator by Tom

Tom was so kind to allow us to post his version of the spark eliminator on our page.
He uses the below version very successfully with his 12S powered nitro/gas –> electric conversions.

Let’s hear more from Tom:

Here’s an idea I use on all my high powered models (6s-14s) which allows me to power up (i.e. "arm") my models without having to take off a wing or canopy. Currently, very few products are sold that allow you to safely and efficiently switch high voltage/current systems.

As most of us know, there is not an easy way to get around (i.e. arrest) the dreaded "Spark" when connecting large batteries to models, and hence tend to ruin connectors over time (be sure to occasionally check them!… my heli friend lost his $1400 heli due to a "carbonized" connectors).

ANTI-SPARK-MAXI-SWITCHSuch spark arrestors have previously been discussed in RC Groups and a few applications have been mentioned. I opted to use Anderson Power Poles (better contacts and higher current rating) and a new arming switch sold by MPI.
As for the spark arrestor, I used a 1.8 ohm 5 watt resistor, which by use of a momentary button, is applied across the arming circuit (allows the ESC’s onboard filtering capacitors to gradually charge instead of trying to instantaneously charge, hence the spark). 

To arm my model, I simply press this momentary arming button, then while held in, I attach the main arming jumper, releasing the momentary button. This main arming jumper is made from two Anderson Power Poles and a short wire jumper.
anti-spark-schem

I have this setup installed in over 6 larger planes of mine and has worked flawlessly. It also makes it very easy to disconnect power upon landing. Thought I’d pass on the idea…

Zero-Arming-Switch

Thanks Tom !!
Should you build your own version of Tom’s spark arrestor, make sure to drop us an email and let us know how it worked out for you.


Feb 15 2010

The Anti-Spark – a DIY Project

With larger and more powerful EDF power setups beyond 5S the need for an anti spark circuit becomes important.

Although many modern ESC have either an in-build spark eliminator (example: Kontronik Power Jazz 63V) or come with a separate anti spark connector (example: HET 100A ESC), there are still ESC’s out there which come with neither (example: Hyperion 90A).

This article is intended for modelers which such a ESC’s.

What does an anti spark circuit / arrester do?

Basically it eliminates the spark/arc which is created between Battery connector and ESC Connector when initially connecting a high voltage battery to your ESC.

Why is there are spark?

The current spike which is generated when you close the circuit (connect the battery) is the cause for this spark.
The spark usually becomes properly visible (and audible) with setups of more then 5S.

The higher the voltage of the setup you are using the larger and louder the spark will be.

So why not spark away?

Although we have not experienced this by ourselves yet, there are reports from modelers that the voltage spike can permanently damage the ESC.

Fact is however that the spark will damage your connectors as they are slowly eroded away with each connection you make. This will in return increase the electric resistance of the connector possibly causing it to fail due to heat build up one day.

What can be done?

There are multiple DIY solutions available in the net, ranging from simple to highly complex
Here we would like to describe a simple solution by using 1 resistor only.

As mentioned above the spark is generated from the initial high current spike when connecting the battery to the ESC.
To eliminate the problem the ESC needs to be slowly "charged up" before the battery is connected fully.

elcoThe "charging up" is done by loading the electrolytic capacitors on the ESC (see picture).
 

Each ESC comes with 2 or more of these capacitors. Once they are charged up the battery and ESC are in an equally loaded state which means that no current spike and therefore spark will be generated.

Building the Spark Eliminator

Items required:
- 1x short piece of silicon wire
- 1x Resistor of suitable value for your ESC
- 1x heat shrink tube

If you are using Gold connectors between esc and battery:
- 1x male + 1x female connector (same type as you use between ESC and Battery)
   example: 6mm gold connector as shown here

If you are using Deans connectors between esc and battery:
- 1x small polarized connector pair (e.g. mini deans)

Before you start shopping for your resistor you need to calculate the size required for your ESC/battery combination.

Although in general a small Ohm resistor with 1/2 to 5 watt will work you can adjust the value depending on your ESC and intended "charge time".
Click here for a link to a great tool which will do the calculation for you depending on battery size, capacitor and charge time (we will describe the calculation method another time).

Now you can start building. Depending on the connector you use between ESC and battery follow either diagram below.

Using Gold Connectors:

 Anti Spark Diagram with Gold Connectors

Using the spark eliminator: Spark Arrestor
- Make sure the male/female connector we prepared above is only connected to the ESC via the cable/resistor
- Connect the minus pole of Battery to minus pole of the ESC
- Connect the battery plus pole to the male/fame connector
- What 1-2 seconds
- Connect the male/female connector to the plus pole of the ESC

Using Deans Connectors:

Anti Spark with Deans connector

Using the spark eliminator:
- Connect the small polarized connector between battery and ESC first
- What 1-2 seconds
- Connect the battery to the esc with the main connectors.

Whether you are using the deans or the gold connector version (or any other connector), in all cases there should be no spark. If there still is a slight spark then the capacitor on the ESC are not fully charged yet. In this case wait 1-2 seconds longer the next time before you make the final connection.


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