Model helicopter world november december 2015

REVIEWS + EVENTS + TECH www.modelheliworld.com November/December 2015

SAB GOBLIN URUKAY

The Urukay 3 Blades is a truly exciting model

FREE

Scottish Nat’s 2015

video content WORTH £5.99!

Brett flew north while Dave chauffeured his models

See inside for details

Pöting Speed Cup Highlights from the 5th Pöting Speed Cup

Slowflyworld

● FROM THE GROUND UP ● SCALE BY SCALE ● IDLING UP

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REGULARS...

9

Dart Tin Technologies have upped their game with this high performance 3D model

11>

DT700E

Issue 305

US

£4.50•

MHW chats with the motor ‘optimiser company’

THE BEST IN R/C HELICOPTERS Cover_MHWNOV15.indd 1

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November/December 2015 Issue: 304

For free video content see page 39

REGULARS Cover

SAB Goblin Urukay The Urukay claims to be able to do it all, let’s find out if it can

8 Collectively Speaking Editorial Musings

by Jon Tanner

12 Sales Pitch New Items

by Richard Morris

16 From the Ground Up

Thoughts on about today’s power requirements and the complexity of setting up a modern gyro

by Richard Morris

28 Scale by Scale

FEATURES 20 Review DT700E

Dart Tin Technologies have upped their game with this high performance 3D model

by James Wang and Tom Scully

34 Technical Outwards and Upwards

S76 chassis scratch design and build, plus a look at a GoPro alternative

by Ed Darter

40 Review OptiPOWER BEC GUARD

Protecting the BEC and the helicopter electronics

by Kevin Targett

42 Review SAB Goblin Urukay

SAB Heli Division produce truly exciting models and the Urukay 3 Blades is exactly that and Richard couldn’t resist…

by Richard Morris

20

50 Technical Small Rotors A DIY quadrotor

by Nigel Cartwright

56 Event Pöting Speed Cup ​​

Highlights from the 5th Pöting Speed Cup

by Raimund Zimmermann

60 Technical Slowflyworld – ‘Life is too short for bad technique’

MHW has a chat with the motor ‘optimiser company’ Slowflyworld

by Fred Annecke

70 Event Scottish Nat’s 2015

While Brett flew north, Dave chauffeured his models and then Campbell Gray chauffeured him around!

by Brett Houghton

56

A tail of two Jet Rangers or the fun and games whilst fitting two hang-on scale bodies to 30-size and 60-size pod ‘n’ boom mechanics!

by John Bottomley

64 USA Heli Scene

Innovative VTOL designs from California, the versatile KK2 board and open aero VTOL software

by James Wang

74 Readers Write

by Richard Morris

76 Idling Up

This month we conclude our look at circuit flying with some even more challenging manoeuvres!

by Duncan Osbourn

80 Classified Adverts Good Buys!

81 Shopper’s Directory Shops in your area

82 In the Next Issue

70

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the

‘yes you can ‘ helicopter

The Blade® 230 S collective-pitch electric heli is engineered to meet and go beyond the needs of the intermediate heli pilot. Featuring a highlytuned design and innovative SAFE™ technology, learning basic aerobatic flight is made simple.

Plus with it’s crash prevention features and flight mode versatility you can move easily into advanced aerobatics and even 3D—all with one heli.

PANIC RECOVERY MODE 1.

Orientation

SaFe Flight mode veRSatility Stability mode Limited flight envelope with self-leveling and a bank angle limit

is lost!

agility mode Full control authority for sport aerobatics, no bank angle limits

2.

Push the panic recovery button

3d mode Turns up the flip and roll rate for 3D capability

3.

Recovery to a level attitude

Panic RecoveRy mode Return to a level attitude at the press of a button

horizonhobby.co.uk

Find Your Local Store Online at horizonhobby.co.uk/shopfinder

SERIOUS FUN™.

Blade products are available from all good model shops. For details of your nearest dealer look on our website horizonhobby.co.uk, contact us by telephone: 44(0)1279 641097, or by email: sales@horizonhobby.co.uk. ©2015 Horizon Hobby, LLC. Blade, SAFE, the SAFE logo, Serious Fun and the Horizon Hobby logo are trademarks or registered trademarks of Horizon Hobby, LLC. All other trademarks, service marks and logos are property of their respective owners.

Actual product may vary slightly from photos shown. 49491

49491 BLH 230 S RTF/BNF 1pg Consumer Ad.indd 1 Horizon FP(Blade)_MHWNOV15.indd 5

27/08/2015 12:00 22/9/15 10:07:04

REVIEW words/PICTURES: James Wang and Tom Scully

DT700E

Dart Tin Technologies have upped their game with this high performance 3D model

The DT700 with a bavarianDEMON electronic flybarless controller yields a very stable hover

T

om and I have been flying the DT700 for few months and it is the first model we have built from Dart Tin Technologies Company of Shenzhen, China. We are pleasantly surprised by its flight performance and we enjoy its well-behaved hovering, the aerobatics are smooth and instil confidence. I first built the DT700 with a 540 kV motor and I was revving the main rotor at 2200 rpm. The model was a hot rod performer with a 12S LiPo battery and 690 mm length rotor blades; the DT700 was extremely fast.

Tom then took over the model for a couple of months and he replaced the motor with a Quantum 4530 500 kV motor. Tom was flying at only 1900 to 2000 rotor speed, which made the helicopter quieter and less intimidating. But the 3D performance was equally fantastic because the Quantum 4530 is a 5000 watt (6.5 hp) motor and Tom uses +13 to -13 degrees of collective travel. With the Quantum 4530, the vertical or horizontal acceleration is blazingly fast, and there is no drop in rpm at any collective setting.

Design FeaturesÂ

The designer went for simplicity and functionality rather than complexity. There is no 2-stage belt drive, push-pull, or DFC (direct flight control) type main rotor control system. Rather the DT700 epitomizes the verdict that it is much easier to design a modern electric R/C helicopter than an old fashioned engine powered flybar

The streamline canopy and ample power from a 5000 watt Quantum 4350-500 motor leads to a fast and fun forward flight equipped helicopter like a Raptor 90 or a Hirobo Eagle. On the old Raptor 90 and Hirobo Eagle or Freya, there is a cooling fan, fan hub, centrifugal clutch, clutch shaft, fan shroud, engine mount, fuel tank, flybar seesaw, Bell-Hiller mixing arms,

washout arms, and push-pull bellcranks. While with the DT700 flybarless electric helicopter all of above components are eliminated.

The arrangement of the DT700 mechanics remind us of the JR Forza 700, as with both the

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DT700E The arrangement of the mechanics is functional and uncomplicated

The main frame is composed of two 2 mm carbon sheets, with very few plastic parts

The rear portion of the canopy butts together like a Logo 600

The left and right halves of the canopy butt together perfectly

The left and right halves are held together with a magnet. The factory did a nice job on the canopy

There is no restriction on the diameter and height of the motor

A Castle Creations 120 amp ESC and a Castle Creations 20 amp BEC are used

A 6S LiPo battery pack is strapped to each side. The C of G comes out perfectly under the main rotor shaft

120 degrees eCCPM control

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