Tarbosaurus Compatible Parts Database

500 feathering shaft

2009-08-09T01:58:01Z

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)

500 Tail Rotor Shaft

2009-08-09T01:48:41Z

The Trex-500 uses a 4mm x 57mm for the tail rotor shaft. The HDX-500 and Hirobo Lepton also use a 4mm shaft, but I'm not sure of the length.

500 Tail Boom

2009-07-30T16:51:49Z

The standard Align T-Rex 500 tail boom (TT or Belt drive) is 16mm in outer diameter (OD), 15mm in inner diameter (ID) and 460mm long. Here are some exactly compatible booms:

Align T-Rex 500 (Belt / TT) (16mm OD; 15mm ID; 461 mm length)

Mostly compatible:

Not compatible are:

HDX-500 (SAS/SAH/HC) (15mm OD; 14mm ID; 455 mm length)
Hirobo Lepton 500 (15mm OD; 14mm ID; 455 mm length)

500 main shaft

2009-07-30T16:40:38Z

The standard Align T-Rex 500 main shaft is 8 mm in outer diameter (OD) and 116 mm long. It is hollow and made of steel or stainless steel. Here are some mostly compatible main shafts:

Here are incompatible main shafts:

HDX-500 (SAS/SAH/SE): mm x 10mm
HK-T500: 8mm x 116mm The diameter and length are correct but the shaft lacks the indentation necessary for the Align one-way bearing to fit. Thus, only HK-T500 one-way bearings can fit on HK-T500 shafts and vice versa. That being said, the upper shaft is compatible with Align T-Rex 500 swashplate and head assembly.

iMax B6AC charger

2009-07-17T10:51:02Z

I just bought a used iMax B6AC charger (LiPo/Li-Ion/NiMH) to complement my previous Turnigy Accucel-8 charger. I had trouble finding the user manual but finally located it. I'm posting a copy here just in case anyone wants it:

iMax B6AC Charger User Manual (pdf)

And here's a little comparison table that I drew up comparing the iMax with the Turnigy units:

	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

]]> website:

Hold on "ENTER" and "-" button at while powering on the charger. The charger display something like this : +00 VOL: x.xxV SAVE(ENTER) Then plug in a battery in the charging plug and you can see the voltage detected by the charger. Now you can adjust it by pressing + or - I just have to find a good voltmeter because i don't trust my voltmeter more than the accucel !

I'll have to give it a go. It should work on the iMax since they share the same software.

Balancing connectors on Li-Po batteries

2009-07-17T10:50:51Z

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.

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.

]]> 6S male: 455-2252-ND 6S female: 455-2269-ND

JR 241 servo vs. E-Sky EK2-508 video head-to-head

2009-07-17T10:50:44Z

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.

P1040184.MP4

Micro servos compared

2009-07-17T10:50:34Z

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.

Mini-Servos

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 compared

2009-07-17T10:50:10Z

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	Analog	35x16x31mm	19g	0.10 sec/60°	4.2kg/cm	0.08 sec/60°	Plastic	$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	Analog	32.4x16.8x30.8mm	31g	0.14 sec/60°	3.9kg/cm	0.11 sec/60°	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 compared

2009-07-17T10:48:36Z

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.

450 Main shaft

2009-06-21T18:36:23Z

The standard Align T-Rex 450 SE main shaft is 5 mm in outer diameter (OD) and 116 mm long. Here are some mostly compatible main shafts:

HDX-450: 116mm x 5mm
Belt CP: 1__ mm x 5mm

Here are some main shafts that are the same diameter, thus the swashplates should be compatible even if the main shaft isn't:

Outrage G5
Beam E4
MiniTitan E325: 130mm x 5mm (also j-bolt holes different)

Here are incompatible main shafts:

450 Tail boom

2009-06-21T18:00:37Z
The standard Align T-Rex 450 SE/V2 tail boom is 12mm in outer diameter (OD), 11mm in inner diameter (ID) and 347mm long. Here are some exactly compatible booms:

Align T-Rex 450 XL/SA/SE/V2/Pro: (12mm OD; 11mm ID; 347 mm length)
EXI 450 (12mm OD; 11mm ID; 347 mm length)
HK-450 (12mm OD; 11mm ID; 347 mm length)
Mostly compatible:

HDX-450 v4 (12mm OD; 11mm ID; 343 mm length)
Belt CP (12mm OD; 11mm ID; 352 mm length)
Blade 400(12mm OD; 11mm ID; 360-364 mm length) -- need to cut down to length
Not compatible are:

MiniTitan e325 (14mm OD)

Welcome!

2009-05-21T05:23:03Z
Welcome to Tarbosaurus.org -- a site dedicated to T.Rex clones, third party upgrades, and compatible parts. It was born out of my experimentation with the e-sky Belt CP, HK-450, and HDX-450 helicopters. I'm creating a database of compatible and interchangeable parts, watch this site for more information!