The standard Align T-Rex 500 main rotor feathering shaft (TT or Belt drive) is 6mm in diameter, 5mm diameter at the outside bearings, and 76.2 mm long.
Here are some exactly compatible shafts:
Align T-Rex 500 (Belt / TT) (6mm / 5mm x 76.2 mm)
Mostly compatible:
Not compatible are:
HDX-500 (SAS/SAH/HC) (5mm OD; xxx mm length)
Hirobo Lepton 500 (5mm OD; xxx mm length)
| iMax B6AC | Accucel-6 | Accucel-8 | |
|---|---|---|---|
| Max Power | 50 watts | 50 W | 150 W |
| Max Current | 5.0A | 5.0A | 7.0A |
| Max LiPo Cells | 6 | 6 | 8 |
| Max NiCD/NiMH Cells | 15 | 15 | 27 |
| Max Pb | 20v | 20v | 36v |
| Power Input | 100-240 VAC 11-18 VDC | 10-18 VDC | 10-18 VDC |
I use Zippy brand 11.1 volt (3S) 2200 mAh battery packs on my 450s. The only problem I found is that the balancing connectors on them aren't nearly long enough to reach from my Turnigy charger to my bomb-proof charging container (an old army-surplus ammo case). I tried to see if anyone sold 3S lipo battery connector extensions, but no luck.
(SN).jpg)
Also, my Turnigy charger requires two connections for LiPo balancing -- the main Dean's connector and the balancing connector. This is a pain in the waddle since you can do it with only one connector -- as long as you remain within the relatively low amp constraits of the balancing connector (likely < 5 amp).
To make life difficult, there are apparently four (4) different LiPo balancing connectors in use. My Zippy batteries use the Align standard, which is a JST XH connector. Here's a very handy chart describing the various connectors and which batteries use which connector: http://www.rcaccessory.com/pdf/Battery%20Tap%20Configuration%20Guide.pdf
Now that I know that both my Turnigy charger and my Zippy batteries use JST XH, I just had to go to Digi-Key and order the right parts:
1 10 455-2249-ND CONN HEADER XH TOP 4POS 2.5MM JST XH SHROUDED HEADER 0 0.13500 $1.35 2 10 455-2267-ND CONN HOUSING 2.5MM 4POS JST XH HOUSING 0 0.05700 $0.57 3 100 455-2261-1-ND CONN TERM CRIMP XH 26-30AWG JST CRIMP CONNECTOR 0 0.03340 $3.34 4 10 455-2219-ND CONN HOUSING 2.5MM XH 3POS JST XH HOUSING 3 PIN 0 0.05700 $0.57 5 10 455-2248-ND CONN HEADER XH TOP 3POS 2.5MM JST XH HEADER 3 PIN 0 0.10000 $1.00
Once the connectors arrive, I'll have enough to play around with them for quite a while!
p.s. Bonus, the same connectors can also be used to create extensions for my LiPo battery monitors.
I was trying to decide which servo to use in my project. I had some JR NES-241s lying around from my JR radio kit. They are nice analog servos.
I also had some E-sky EK2-508 digital servos which I had also just ordered.
I wanted to see what the speed difference might be between the two. The JR is rated at 0.23 / 60° arc while the E-sky is rated at 0.10 / 60°. But there are ratings and there are ratings.
So I fired up my servo tester and pitted them head to head in this very short video (1 minute; 5 mb). As you can see, the E-sky is considerably faster.
The e-sky is only rated to 1.0 kg / cm torque while the JR has 1.3 kg/cm. But I think that difference is negligible.
Micro servos are commonly used in 250 and 450 size micro rc helicopters. Here's a little table that I'm using to compare various options.
| Model | Mode | Size | Wgt | Speed@5V | Power@5V | Speed@6V | Gears | Street |
|---|---|---|---|---|---|---|---|---|
| HTX900 | Analog | 21.0x12.0x22.0mm | 9.0g | 0.12 sec/60° | 1.6kg/cm | 0.11sec | Nylon | $4 |
| Towerpro SG90 | Analog | 21.0x11.5x27.0mm | 9.0g | 0.12 sec/60° | 1.2kg/cm | Yes | Nylon | $5 |
| E-sky EK2-0508 | Digital | 22.8x11.5x20.8mm | 7.5g | 0.10 sec/60° | 1.0kg/cm | Yes | Nylon | $10 |
| Towerpro MG90 | Analog | 23.0x12.2x29.0mm | 14.0g | 0.11 sec/60° | 2.2kg/cm | 0.10 sec | Metal | $12 |
| E-flite S75 | Analog | 23.0x12.0x24.0mm | 7.5g | 0.12 sec/60° | 1.17kg/cm | No | Nylon | $14 |
| Spektrum DSP75 | Analog | 23.0x12.0x24.0mm | 7.5g | 0.11 sec/60° | 1.17kg/cm | No | Nylon | $20 |
| Futaba S3114 | Analog | 21.8x11.0x19.8mm | 7.8g | 0.10 sec/60° | 1.5kg/cm | 0.09sec | Nylon | $15 |
| Power HD-2216HB | Digital | 22.8x12.0x25.4mm | 13.6g | 0.13sec/60° | 1.8kg/cm | Yes | Metal | $20 |
| Align DS410 | Digital | 22.8x12.0x25.4mm | 12.7g | 0.13 sec/60° | 1.8kg/cm | 0.09sec | Metal/Plastic | $26 |
| JR NES-241 | Analog | 21.5x11.5x22.0mm | 9.0g | 0.23 sec/60° | 1.3kg/cm | Yes | Plastic | $30 |
| JR DS290G | Digital | 21.0x11.0x21.0mm | 7.0g | 0.08 sec/60° | 0.9kg/cm | 0.07 sec | Nylon | $35 |
| Futaba S3154 | Digital | 21.8x11.0x19.8mm | 7.8g | 0.10 sec/60° | 1.5kg/cm | 0.09sec | Nylon | $35 |
| Ino-Lab HG-D202MG | Digital | 23.0x11.4x24.1mm | 9.8g | 0.16 sec/60° | 2.5kg/cm | 0.13 sec | Metal | $35 |
| Align DS410M | Digital | 22.8x12.0x25.4mm | 13.5g | 0.13 sec/60° | 1.8kg/cm | 0.09sec | Metal | $37 |
| HiTec HS-65MG | Analog | 24.0x12.0x24.0mm | 11.2g | 0.16 sec/60° | 1.6kg/cm | 0.13sec | Metal | $37 |
| HiTec HS-5065MG | Digital | 23.6x11.6x24.0mm | 11.9g | 0.14 sec/60° | 1.8kg/cm | 0.11sec | Metal | $47 |
The conversion for torque from kg/cm to oz/in is to multiply by 14.7. So a servo with a torque of 1.0 kg/cm has an imperial torque of 14.7 oz/in.
| Model | Mode | Size | Wgt | Speed@5V | Power@5V | Speed@6V | Gears | Street |
|---|---|---|---|---|---|---|---|---|
| Futaba S9257 | Digital | 36.0x15.0x29.0mm | 26g | 0.08 sec/60° | 2.0kg/cm | No | Nylon | $60 |
Mini servos are commonly used in 500 size helicopters such as the Align T-Rex 500. Here's a little table that I'm using to compare various options.
| Model | Mode | Size | Wgt | Speed@5V | Power@5V | Speed@6V | Gears | Street |
|---|---|---|---|---|---|---|---|---|
| GWS HPX | Analog | 35x16x31mm | 19g | 0.07 sec/60° | 3.0kg/cm | 0.05 sec/60° | Plastic | $13 |
| GWS HPX F | 0.10 sec/60° | 4.2kg/cm | 0.08 sec/60° | $13 | ||||
| TowerPro MG930 | Digital | 36.2x15.2x28.7 mm | 26g | 0.14sec/60° | 3.6 kg/cm | 0.11 sec/60° | Metal | $16 |
| Hitec HS-225BB | Analog | 32.4x16.8x30.8mm | 27g | 0.14 sec/60° | 3.9kg/cm | 0.11 sec/60° | Nylon | $20 |
| Hitec HS-225MG | 31g | Metal | $30 | |||||
| Hitec HS-5245MG | Digital | 32.0x17.0x31.0mm | 32g | 0.15 sec/60° | 4.4kg/cm | 0.12 sec/60° | Metal | $48 |
| Align DS510 | Digital | 35x15x29.2mm | 26g | 0.13 sec/60° | 3.7kg/cm | 0.11 sec/60° | Metal | $50 |
| MKS DS9660 | Digital | 35.0x18.0x28.0mm | 35g | 0.13 sec/60° | 3.7 kg/cm | 0.10 sec/60° | Metal | $57 |
| Futaba S9650 | Digital | 36.0x15.0x29.0mm | 26g | 0.14 sec/60° | 3.6kg/cm | 0.11 sec/60° | Nylon | $65 |
The conversion for torque from kg/cm to oz/in is to multiply by 14.7. So a servo with a torque of 1.0 kg/cm has an imperial torque of 14.7 oz/in.
Standard servos are used in larger helicopters -- 600 size electrics or nitros. Here's a little table that I'm using to compare various options.
| Model | Mode | Size | Wgt | Speed@5V | Power@5V | Speed@6V | Gears | Street |
|---|---|---|---|---|---|---|---|---|
| TowerPro SG5010 | Analog | 40.0x19.0x43.0 mm | 39g | 0.14sec/60° | 8 kg/cm | 0.11sec | Nylon | $8 |
| Hextronik HX12K TowerPro MG995 | Analog | 40.7x19.7x42.9 mm | 55g | 0.16 sec/60° | 10 kg/cm | 0.13sec | Metal | $8 |
| Hitec HS-322HD | Analog | 41.0x20.0x37.0mm | 43g | 0.19 sec/60° | 3.0kg/cm | 0.15sec | Karbonite | $10 |
| Bluebird BMS-621 | Analog | 40.5x20.0x38.5 mm | 41g | 0.13sec/60° | 6 kg/cm | 0.10sec | Plastic | $15 |
| Scanner RC SSV-9764MG | Analog | 40.5x20.0x38.5mm | 62g | 0.16 sec/60° | 9.6kg/cm | Yes | Metal | $18 |
| Futaba S3001 | Analog | 41.0x20.0x35.0mm | 45.1g | 0.28 sec/60° | xxkg/cm | Yes | Nylon | $20 |
| Futaba S3004 | Analog | 41.0x20.0x36.0mm | 37.2 | 0.23 sec/60° | xxkg/cm | Yes | Nylon | $20 |
| JR DS821 | Analog | 38.0x18.0x37.0mm | 43g | 0.19 sec/60° | 5.1kg/cm | Yes | Composite | $30 |
| Futaba S9257 | Digital | 36.0x15.0x29.0mm | 26g | 0.08 sec/60° | 2.0kg/cm | No! No! | Nylon | $55 |
| Futaba S9650 | Digital | 36.0x15.0x29.0mm | 26g | 0.14 sec/60° | 3.6kg/cm | 0.11 sec/60° | Nylon | $65 |
| Ino-lab HG-D751MG | Digital Coreless | 39.5x19.5x36.8mm | 54g | 0.14 sec/60° | 11.2kg/cm | 0.11 sec/60° | Metal | $80 |
| Ino-lab HG-D760HB | 48g | 0.10 sec/60° | 6.8kg/cm | 0.08 sec/60° | Carbonite + Metal | $70 | ||
| Ino-lab HG-D760MG | 52g | 0.09 sec/60° | 9.6kg/cm | 0.xx sec/60° | Metal | $75 | ||
| Hitec HS-965MG | Analog | 40.0x20.0x37.0mm | 62g | 0.13 sec/60° | 7.4kg/cm | 0.10 sec/60° | Metal | $70 |
| Hitec HS-985MG | Analog | 39.4x20.0x37.8mm | 62g | 0.16 sec/60° | 9.6kg/cm | Yes | Metal | $70 |
| Futaba S9402 | Analog | 41.0x20.0x38.0mm | 55g | 0.13 sec/60° | 6.4kg/cm | Yes | Metal | $75 |
| Futaba S9252 | Digital | 40x20x37mm | 50g | 0.14 sec/60° | 6.6kg/cm | No! No! | Nylon | $85 |
The conversion for torque from kg/cm to oz/in is to multiply by 14.7. So a servo with a torque of 1.0 kg/cm has an imperial torque of 14.7 oz/in.
