It's a Walkera Dragonfly 36#B

Burgess · Extreme 3D Joined: 27 Mar 2012 Posts: 1103 Location: Wales

Here's my latest project modified Walker Dragonfly 36#B

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T-rex 450 clone canopy I did a none complicated paint job on this very inexpensive canopy I think it's a Hobbyking canopy, nevertheless, it's almost indestructible.
Walkera 36 main frame
Align silver boom
450 Carbon boom braces
Flasher tail gear-box and rotor.
The skids T-rex 450 legs with Flasher skid-pipes
Walkera 60#B Stabilizers
Scratch built battery carrier.

The main rotor consists of Walkera 36 main shaft with pitch slider block and Creata 400 Washout arms, Walkera 36#B swashplate, and modified T-rex 450 clone rotor components.

Electronics:
30A RedBrick ESC
Turnigy 450 Heli Outrunner 3500kv 370w 2837B motor

Servos:
Cyclic Hextronic HXT900
Collective Tower Pro MG90S
Rudder EMAX ES9207

Gyro Walker WK-G010 AVCS
I've now fitted Radiolink 2.4 ghz 6 channel receiver.
I have cheep glass fibre rotor blades on at present, they're OK, but not as efficient as the carbon fibre blades fitted on two of my T-rex 450 clones.

Here is a section view of the carbon fibre blade construction:

As can be seen they have very thing trailing edges, and while they work OK as they come, reshaping the leading edges to blend in the narrow flat with 600, 800 grit wet n dry to produce a good leading radius renders them more efficient. My 450's get light on their skids at 4.5 degrees pitch.

brett546 · Charging Joined: 13 Dec 2012 Posts: 2 Location: Rotterdam

A nice little four-channel helicopter.There are also some neat upgrades for it, to increase durability, performance and give it a more large scale helicopter look.It's upgraded metal rotor head and metal swashplate little heli will amaze all rc helicopter lovers.

Burgess · Extreme 3D Joined: 27 Mar 2012 Posts: 1103 Location: Wales

admiral · Posted: Fri Dec 14, 2012 2:40 am Post subject:

Nice job there Burgess, how does it fly ?

Burgess · Extreme 3D Joined: 27 Mar 2012 Posts: 1103 Location: Wales

Thanks Keith,

It flies really well, and that's down to the Walkera NOR rotor head architecture. With direct connection between swashplate and flybar-control frame, and no electronic swash-plate pitch-mixing there is no interaction, the result is very accurate cyclic control.
With this 3500kv 370watt motor, collective response is crisp, it lifts-off straight up into hover with little drift to port.
This 30A Redbrick ESC though inexpensive has a really good soft start, no snatch or extended ramp up.

However, with only a 1300mAh LiPO, flight time is quite limited.
Consequently I'm looking to optimising overall performance, by increasing the flight duration and reducing the AUW.
I'm using the 1300mAh LiPo simply because I use them in my other two 36#Bs.

So, modify the battery carrier to accommodate an 1800mAh LiPO.
Trade-off the weight gained by: -

i) fit a lighter motor with lower current draw and higher kv;
ii) fit cooler running ESC (reduce watts lost to heat);
iii) replace some or all CNC alloy rotor head components with plastic;
iv) possibly fit semi-symmetrical blades.

May need to relocate the horizontal stabilizer rearward to reestablish CoG.

Blues4dog · Posted: Tue Dec 18, 2012 5:04 pm Post subject:

That is a very interesting rotor head !!!!