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幻影 Mirage 2000

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• 未玩過Delta 機, 平平地$330 已塗裝唔使煩
• 要加闊倉4s 倉位
• Power : 4s 2200,
• 
  

August 08

@#$% failed maiden. Nose too heavy with my 2100mA 3s, let alone a 4s. Measured power ~ 3s x 30A ~ 300W. Thrust is not enough.

加速後完全拉up 唔到. CG too forward. Head destroyed on impact with a concrete next to the runway. Will try to move the duct fan backward, such that 4s can be used.

九月

電倉改後了若8cm , 4s推力 >700g . RTW ~700g . Elevator exp -20%, Ail D/R exp - 50%, Ail 好靈 . 後輪亦降低 2cm .

成功, 好飛, landing 超定

Eagletree logged max 660W! @4s ,Max 45A

Average 430W, 30A

Happy Flying

Flied for 9 hours. Almost exhausted today.

Total flied 3 helicopters and 3 planes.

New Cheap 600 Canopy

Cost HKD$160 only. You got what you pay. The pattern is not sprayed but is ultrathin sticker!

But looks so good!

Flybarless 600 servo horn gear

Be careful if you upgrade Trex 600 flybarless. Make sure the servo horn gear is strong enough, especially the elevator servo, which do the job by its own. Without the mixing arm above the swashplate, the servo horn inner gear will take all the force.

Replace Faulty Carbsmart sensor, HKD$3

My os50 easily getting "overheat" as the carbsmart tries full rich at a few tic toc. The incident happens after the bird soaked in 6 inches water month ago. The engine does not lose power but the carbsmart tries full rich shortly after some 3D. The ring/ sleeve is suspected to be worn (due to water soaked?)
Right dismantled engine is rusty and the parts are jammed by rust. After some repair job and the carbsmart is still pushing rich easily. THen the sensor is suspected damaged as well.
Grounded engine temp. is only 100degree cel and the carbsmart sensor is suspected to get faulty, after 50 -60 flight.

Original CSM sensor is smd and is prone to have short life, due to vibration or overheat.


Replacement sensor :
Murata SMD Thermistor number: NCP18WF104J03RB
Resistance: 100K at 25C
B constant 4250

Temp test data
5.63K/100C and a 4.45K/110C

Temp. Resistance Approx rate of change(deg. C) (k ohm) (k ohms/ deg.C)
10 213 10
20 127 6
30 79 3.5
40 50 2
50 33 1.3
60 22 0.8
70 15.4 0.5
80 10.8 0.35
90 7.8 0.24
100 5.7 0.17

I use another cheap HKD$3 NTC TTC 1004 100k thermistor, which is available in most electronic component shop in HK.
After test the B value is ~ 4600.
temp resistance
45 37k
88 7k
100 4.5k
110 3.3k
120 2.4k
calculation can be obtained from http://www.doctronics.co.uk/programs/thermistor.xls
So it can replace the SMD thermistor, except to scale up the desired temperature by 10 deg.
(To be confirmed with eagletree log)

Trex 600 Flybarless

Using new Z50 570kv motor, 15T Align new pinion, the headspeed reach 2200 rpm+

End of flight, temp Z50 is only 58 degree. Battery 40 degree only ! Ver efficient motor!

The Align motor pinon is 6mm and is reduce to 5mm , by using the Align 450 one-way bearing sleeve. In addition, the pionion end needs to be deepened as the Z50 motor has long shaft (by 6mm) .