Trex 600

My first 50class helicopter.

Maiden Flight

• Renew the older version tail grip with thrust bearing 3*8*2.5 . CA the screw as loctite alone has problem as the thrust bearing will locked on tightening the screw. My tail problem (locking in mid air and higher headspeed) is now gone.


• Upgraded to Z50B (800kv) and 14s1p A123, CC85HV. Throttle 88%. Headspeed 2000. Max amp 55A, average 14A, Power >2000W. Temperature after 5 min 3D. Z50- 75 oC, A123 45 oC.

Early video on stock 600L motor

Starwar X-wing

Prototype

Align F16 400

My first plane
Cannot control it at all cos no knowledge of flying


Video
450T/ 1800kv
APC 7x7
要快可快, 直上直落冇難度

Reset DX7

Aileron D/R switch is in the UP position.
Press and hold the DOWN and SELECT buttons and turn on radio. Now you're in the setup menu.
Scroll up/down until you get to the screen that says [Model Reset]
Press the Adjust Descrease button (r/h side of LCD)
Flip the Aileron D/R switch down
Press the Adjust Increase button
Flip the Aileron D/R switch up
Press the Adjust Descrease button
Keep alternating this Aileron D/Rup/down and Adjust Increase/Decrease sequence (about 5 cycles)
The radio will 'beep' and the LCD will go dark. This is the LCD test.
Scroll Up/Down (left side of LCD screen) through the Service Menu
from rcgroups

Convert Futaba FF7 to 2.4G

1) The PIC board (Program board that cut the excess Channel to 6 Channel signal, and change Futaba +PPM to -PPM) . You need a PIC burner to do this. Make sure your firmware support the PIC 12F683.

2) 5V power supply to PIC board. It takes <20mA.So if you Tx circuit feeds 5V is ok to steal it from the Tx circuit. My FF7 do not feed 5V (only 3.2V) so I need an extra 5V supply (Any $10 USB charger will do)

3) Since I use 3 cell li-po for my FF7, the DX6 module eats max 11V. So I can 2 diode to reduce voltage from 12.6V to 11V.

Other tips:

隱藏：
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1) Reset all Failsafe in all channel in the original DX6 Tx. THis is because Failsafe information is stored in receiver. Once conversion done, you cannot reset/change the failsafe setting, unless reconnect to the DX6 Tx. This is important if planning to convert Futaba as the channel correspond different ftom JR/DX6. e.g. Channel 1 = Throttle in DX6 will become abnormal movement aileron CCPM in Futaba.

2) Must ground all connection , including the 5V supply, PIC board and DX6 module.

3) The DX6 module will time out in <1 seconds if not PPM signal on initiation, so do not be surprised. Some Futaba model has been mentioned to switch on the Tx before the DX6 module. But I have no problem to start them together.

4) The PIC hex file from rc-man has a new version v1.3, the old version does not work with Futaba.

200W lipo loader

Quick and cheap way to test any dead cell in lipo.
Just a cheap voltmeter will do.
Items needed:
12V car headlamp ~50W.

Since a car headlamp has 2 filament, run them in parallel will give 100W. Make sure you test which of the 3 pins is ground.

Run 1 headlamp will draw 10A
Run 2 headlamp in parallel will draw 20A.

Then check the voltage of each cell of a fully charged lipo while the headlamp is on.
Observe any voltage drop below 3V in 10s.

6V 1.5A Switching BEC, Up to 7s Lipo

I got a 12V USB charger output to 5V USB (for palm)
Inside is a voltage regulator (switching type) @2A , part # MIK34063
There is 2 voltage monitor resistor R1 and R2
V out = 1.25 (1+R2/R1)
The default V out is 5V, R1 =10k, R2=300k
So change R2 to a 380k will result in a 6V switching BEC
Material:
Palm car 12v--USB charger , I got many spare
380Ohm resistor, $0.5

Phoenix 35, 2A BEC 5V: load 1.7A -->4.4V, load 1.9A-->4.3V

DIY BEC (spec 1.5A)@6V, loading 1.6A -->5.1V. cannot deliver more than 1.7A as internal protection circuit activate.....

5 min night blade

use a button battery $2, number
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CR1220
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then 3mm superbright led $3.

That is it.
check blade balance. and AB glue the battery well. You can leave one LED leg untouch the battery with a piece of paper when not use.

Rebuild 450TH

The magnets are prone to loosen on crash. Without taking out the bell, you can still CA the magnet back in place but is quite difficult.

Open up the bell:

• place a 1mm thick metal between the bell and the stator base.



• Use a 2.5- 3mm pin to hammer out the bell pin from the end of the bell. This requir a heavy hammer.



• The bell side bearing will usually be damaged.

Take out the stator fromt the stator base:

• Use a pin to struck the stator slightly out from the base. This will have enough space to put in a bearing clamp and the whole stator is pulled out.
  use 0.25mm x 10wires x 4.5 wind per stator teeth.

Use a spacer (3mm x 5mm spacer from carbon blade) to support the pinion. Ne need to loctite the bearing for easy renewal of bearing later.

Compy

A Hong Kong design 300 size heli with belt drive tail. Over powered with 450TH and can do funnel so easy. Body frame is a bit too fragile and will break at the motor mount and tail boom area.
The main shaft is sometimes difficult to take apart after crash as the deformed / broken shaft at the cross pin area, will jam the bearing.

X twin

This is flied by my son, Augustin

My R/C Plane Collection

1.5m Glider , 1.6m Thermal Glider
Align F16
F18 BlueAngle
P51D
X Twin
ThunderTiger Pylon
DIY triangle
A10
F22
SU27
X-wing (DIY)
F3A
A300
V22
Quadratwirl

DIY Eagletree tempearture & infrared rpm sensors

Eagletree Infrared sensor

Eagletree temperature sensor

Use a 10k thermistor , cost ~$2. No polarity.

DIY $60 A123 charger

Put 7.2K ohm 1% 0.5W for 25.2V output.
The white 水泥電阻 5W, 0.1 ohm is current limiting resistor. PUt 3 in parallel for 3A output and 5 in parallel for 6A output.

There is a new version of SUPER car step up adapter rate at 100W.

Original Value:
Parallel Base resistor 7.5k Ohm
Volatge selector resistor: 15V Open circuit, 16V 72k, 18V 22.1k, 19V 18.6k, 20V 14.8k, 22V 10.65k,24V 8.6k?

Modified:
Parallel Base resistor 9.7k Ohm
Voltage selector resistor: Open circuit --> 12.6V, 5.8k --> 25.2V

If not change the prallel base resistor, 7.2 kohm will output 25.2V

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Now I made 4 chargers and take 48A altogether with the car engine & alternator running. Finish charging in 15-20 mins.

My R/C Helicopter Collection

E-Sky FP2
Trex 450
BlackHawk
Lama V2
Compy
Trex 600
Hurricane EP550