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Old Oct 05, 2009, 09:00 PM
Put a bigger motor on it!
gtfreeflyer's Avatar
Costa Mesa, CA
Joined Feb 2007
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My 1st Electric Heli - HK450 (T-Rex 450 clone)

I finally decided to enter the world of 450 sized electric helis and bought a HK450.

Quick Specs and Info:
Heli: HK450
Motor: Turnigy 2836, 3700KV, w/11T pinion
ESC: Castle Creations 45A running on governor mode and disabled the following: BEC, over-current and LVC protection.
BEC: Castle Creations 10A
Gyro: Spartan Quark
Receiver: Futaba R617FS, 2.4 GHz
Cyclic servos: HXT900
Tail servo: DS480
Battery: Zippy Flightmax 3s1p 2200 mAh, 30C
Upgrades: All-metal main rotor head, non-slip tail drive gear, glass fiber main blades
Normal pitch curve (degrees): -2, -1, 0, +5, +10
Idle up 1 pitch curve (degrees): -10, -5, 0, +5, +10
Idle up 2 pitch curve (degrees): -10, -5, 0, +5, +10
Throttle hold pitch curve (degrees): -4, -2, 0, +5, +12
Normal throttle curve (RPM): 0, 2700, 2700, 2700, 2700 using governor mode
Idle up 1 throttle curve (RPM): 2700, 2700, 2700, 2700, 2700 using governor mode
Idle up 2 throttle curve (RPM): 2950, 2950, 2950, 2950, 2950 using governor mode
Throttle hold throttle curve: Motor off
Flight time: 7 minutes doing advanced aerobatics (not 3D) and fast flight with occasional hovers.
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Last edited by gtfreeflyer; Oct 04, 2010 at 03:38 PM.
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Old Oct 05, 2009, 09:12 PM
Put a bigger motor on it!
gtfreeflyer's Avatar
Costa Mesa, CA
Joined Feb 2007
1,394 Posts
The parts have not yet arrived, but here is the setup I ordered...

FLYING PARTS:
Kit - HK-450 helicopter, $30
Motor - Turnigy 2836, 3700KV, $17
Gyro - Assan GA-410, $28 - Edit: Replaced with a JR 770, and then replaced that with a Quark.
Cyclic Servos - HXT900 9g / 1.6kg / .12sec Micro Servo, $3.59 x3
Tail Servo - MKS DS480 Digital Servo 1.85kg / .068sec / 10.9g, $23
LiPo - Zippy Flightmax 3s1p 2200 mAh 30C, $23
ESC - Castle Creations Phoenix 45A, $102 (already have this)
BEC - Castle Creations 10A Switching Regulator, $22 (already have this)
Motor Pinion - 11T (still need to order)

UPGRADES:
Main rotor head upgrade, $28
Tail unit upgrade, $8
Tail holder upgrade, $5.50
Fiberglass main blades, $5
Carbon fiber tail blades, $5

CONTROLS:
Futaba 7C 2.4 GHz Fasst Tx and Futaba R617FS Rx, $280 (already have these)

HELI SETUP TOOLS:
Pitch Gauge , $1.39
Curved Ball Link Pliers, $6.49

Please feel free to comment on my setup and let me know if there is anything else I should get, especially "must have" tools that make setup easier.

Based on the reviews I read, this heli should be very 3D capable with this setup... and way out of my league
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Last edited by gtfreeflyer; Oct 04, 2010 at 03:41 PM.
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Old Oct 22, 2009, 04:17 PM
Put a bigger motor on it!
gtfreeflyer's Avatar
Costa Mesa, CA
Joined Feb 2007
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Arrived!

Everything arrived yesterday, except for the metal upgrade parts which are still on backorder. Sorry I don't have build pictures. I opened the box and then immediately worked on the heli for about 8 hours total. It's just about finished. I'll fly it stock first, then upgrade it later. They did forget to put the tail servo mounting brackets in the box, so I had to run to the LHS and pick up an aluminum set for $12.

Here's an electronic schematic I made of my setup. I tried to make it easy to understand so someone else could use it too. Enjoy...
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Old Oct 31, 2009, 05:52 PM
Put a bigger motor on it!
gtfreeflyer's Avatar
Costa Mesa, CA
Joined Feb 2007
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What a blast I had flying around today. High speed forward flight and tight turns etc. It flies exactly the way I had set it up on Realflight, so I felt all too familiar with the characteristics. It's like it wasn't even new to me even though I was flying it around for the first time. I was too chicken to flip/loop it, but I may try it next time. I took the training gear off after the 2nd battery and just had a blast the rest of the day.
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Old Nov 02, 2009, 05:12 PM
Put a bigger motor on it!
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Costa Mesa, CA
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My first loops and rolls happened today.
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Old Nov 02, 2009, 10:25 PM
Put a bigger motor on it!
gtfreeflyer's Avatar
Costa Mesa, CA
Joined Feb 2007
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First pictures

Routing all those wires was pretty fun. It was such a mess until everything got zip-tied to the frame. This is also the first time I've used up every available port on my Rx.
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Old Nov 06, 2009, 07:42 PM
Put a bigger motor on it!
gtfreeflyer's Avatar
Costa Mesa, CA
Joined Feb 2007
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New canopy arrived today. I'm so glad I went with this one since it matches the main blades. It looks great and now I'm sporting my school colors.

Now if only I could learn to match my clothes, or at least my socks for a start...
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Old Nov 06, 2009, 10:40 PM
WTT memorabilia for planes...
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United States, OH, Coshocton
Joined Jan 2009
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That is one good looking canopy!!! Must of come from back East....LOL!!! Bird looks great, man! Blades and canopy.....DANG!!!
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Old Nov 16, 2009, 02:57 PM
Put a bigger motor on it!
gtfreeflyer's Avatar
Costa Mesa, CA
Joined Feb 2007
1,394 Posts
Still been flying the heck out of the heli. It's much easier to see and maintain orientation with the new canopy. I'm looking to upgrade the cyclic servos now as they seem to struggle a little bit on the hard throttle punches. Tail is also blowing out on backwards flight. I need to play around with the gyro and gain settings before I decide to buy a new one.
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Old Dec 21, 2009, 01:13 PM
Put a bigger motor on it!
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Costa Mesa, CA
Joined Feb 2007
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Pictures...

...
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Old Dec 21, 2009, 01:15 PM
Put a bigger motor on it!
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Costa Mesa, CA
Joined Feb 2007
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Ground testing

...
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Old Dec 21, 2009, 01:17 PM
Put a bigger motor on it!
gtfreeflyer's Avatar
Costa Mesa, CA
Joined Feb 2007
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Danger!

Don't buy these tail blades. I've lost 3 of them in flight already. They all broke as shown in the picture, with a main rotor speed of only 2700 RPM.
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Old Apr 29, 2010, 03:02 PM
Put a bigger motor on it!
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Costa Mesa, CA
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Some shots from yesterday...
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Old Jun 10, 2010, 07:36 PM
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Joined May 2006
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looks like a nice heli. The servos need to be replaced with something more reliable. the plastic gears kinda wear out and shatter teeth
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Old Jun 10, 2010, 08:52 PM
Put a bigger motor on it!
gtfreeflyer's Avatar
Costa Mesa, CA
Joined Feb 2007
1,394 Posts
I disagree. The servos are great for what I do. Metal gears wear out and lead to slop between the teeth, whereas plastic teeth will deform slighty under load but then return to the original position. I was very skeptical about the HXT900's at first, but after putting them thru many flights, I am a believer. See my YouTube videos (same username) for the types of manuevers I'm able to put this heli thru with these servos.
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