This article is my second foray into the Eflite World.  I was therefore keen to see if the Habu II was the same quality as the Beast 60E.  After watching many times members fly the EFlite Habu 1 and how good it really was I was tempted to acquire one myself.  The Habu 1 was discontinued but now the Habu II is available and stocks are at the time of writing good.

The Habu II is an updated Habu I, more colourful and the Guys at Horizon have taken onboard modellers comments.THe model is formed from Z-Foam, a quite dense foam.  THe PNP play version which this review covers requires only your TX and a suitable 4 cell LiPo battery.  The model comes with pre-installed ESC, Ducted fan unit, AR600 receiver and servos.

It retails around the £200 GBP mark so considerably less than a composite model of similar size, the latter usually also requiring you to supply the drive unit, electronics and servos.

The retail box is formed from polystyrene and customised to take all the parts and hold them securely without damage. All the component parts only need fitting together using the screws provided.  Because there is an option to fit retracts, extra parts are included to facilitate this.  The model can also be adapted for flaps, the linkages being supplied also.  You just need to supply the micro servos!  Assembly is fairly straight forward and I completed it in one evening.

The Wing

Stop!  If fitting flaps or retracts you need to do this before any assembly. Albiet you could do it later if need be but it is easier to fit thes ecomponents now. Flaps requires removal of some foam tabs to allow it to hinge free.  Install your servos in the precut slots and after lifting the covering tape lay your servo leads into the slots.  Align the supplied horns and fit to the flaps.  The linkages are in the hardware bag.  I was not to keen on the foam hinging so to beef up the joint I used 3M Blenderm tape top and bottom.  This is virtually transparent and sticks to foam nicely.  Is fairly flexible and waterproof.  It is usually used for medical purposes, holding bandages or even acting like artificial skin to close up cuts.Fitting the wing requires removal of the canopy.  The wing has two guide pins which locate into the rear of the fuselage and the whole wing is secured with three screws.  The rearmost screws are longer so ensure you use the correct ones!

Fuselage

Not much to do here either.  The stabiliser is loosely fitted to the fuselage and then the Fin is located using a guide tube.  The rudder linkage needs removal temporarily so the left and right plastic surround can be fitted to fuselage which secures the fin and stabiliser with 6 screws.  These are a little bit difficult to fit as they are the self tapping type and have to cut their thraeds in the plastic base of the fin. The rear exhaust cone now just slides on to the fuselage to tidy up the tail.  I used a little dab of UH-HU Adhesive but you coul use some tape, ie; Blenderm.

Landing gear supplied is just the wire type but a jet flying with the gear down isn't really right.  You can of course fit retractable gear and the EFlite 15-25 size retracts(EFLG110) are a direct replacement.  The manual gives you the dimensions on cutting off the electric retracts legs to fit. The axles supplied will fit the original wheels.

However, the front nose leg requires a little bending so the wheel retracts as far up into the fuselage as possible.  How to do this is shown in the manual. The wheel well covers for the mains will clip onto the new retracts and the nose wheel cover clips to the nose leg.  EFlite even give you another nose gear cover if using retracts.  What a bonus!  This secured by 6 screws.  You may find you have grind away a little plastic on the cover to ensure the retract axle and wheel clear the cover.

That is about it for assembly.


Ducted Fan Specification


E-flite's Delta-V 15 69mm EDF (EFLDF15) electric ducted fan unit is an ideal choice for products such as E-flite’s BAe Hawk 15 DF and other similar sized ducted fan airplanes. The Delta-V 15 69mm EDF is also an ideal choice for ducted fan airplanes requiring 68-70mm diameter fan units. The BL15 Ducted Fan Brushless Motor, 3600Kv (EFLM3015DF) is purpose-built for this Delta-V 15 69mm EDF and both products will provide great performance.

Specifications:

  • Rotor Diameter: 69mm (2.7 in)
  • Shroud Outer Diameter: 73.5mm (2.9 in)
  • Shroud Length: 58.3mm (2.3 in)
  • Shroud Length (Including Intake Ring): 72mm (2.8 in)
  • Center Body Inside Diameter: 28.3mm (1.1 in) – designed for 28mm motor
  • Overall Weight: 88g (3.1 oz)

Performance Data (Measured using BL15 DF Brushless Motor)

  • BL15 Ducted Fan Brushless Motor, 3600Kv (EFLM3015DF)
  • Static Thrust: 1.7 lbs on 3S (11.1V); 2.8 lbs on 4S (14.8V)
  • RPM: 31,000 on 3S (11.1V); 40,000 on 4S (14.8V)
  • Velocity: 71 mph on 3S (11.1V); 102 mph on 4S (14.8V)
  • Watts: 305 on 3S (11.1V); 644 on 4S (14.8V)
  • Current: 29A on 3S (11.1V);46A on 4S (14.8V)

The manual gives you the deflection measurements for the control surfaces. The factory recommended settings will suffice initially but the manual also suggests for more exciting flight which hole positions in the horns the linkages should be set to.

Centre of Gravity is adjusted by moving the Lipo pack forward or back.  The CofG is 102mm from the wing's leading edge next to the fuselage.

At the time of writing most of the component parts of the model are available as spares.  In fact you can purchase a bare unpainted airframe so you can create your own EDF jet. I have!

On May 3rd the Habu was maidened and test flown by Jon Tappin.  Taking off  from grass may be the issue, not sure but the jet started to lift off at half throttle but any more throttle and it nose down.  We think this is due to thrust line of the jet.  I will update this article when I have solved the issue.

Also, after a few circuits the rudder start to wiggle then it would cease then return.  Reducing throttle did not make any difference so we suspect a faulty micro servo.  Fortunately, on final approach it subsided momentarily for touch down otherwise it may have been very "interesting".

Not blindingly fast but scale I would suggest.  Once in the air, it flew quite well, just got to figure out the take-off issue.  Thinking of raising the nose leg slightly or go to extremes and add vectored thrust!

  Evaluation

 You can check out more EFlite models here  Eflite - Advancing Electric Flight

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