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Old Apr 29, 2012, 03:11 PM
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Quote:
Originally Posted by mhills51 View Post
For the price I would forgo the 550 fuzzy mem for the real mem 650
http://www.hobbyrover.com/tarot-gy65...2685_p923.html
But for the same price the HB790 mems gyro is a better performer on the 250.

http://www.hobbycool.com/hobbymate-h...yro-p-123.html



From what I've seen.

hb790 SKYA 250 (6 min 25 sec)
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Old Apr 29, 2012, 11:43 PM
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Tarot GY550 Mems Gyro

All my 250s are now set for next summer with the Tarot GY550 Gyros. Now since winter has begun, it's just sim sim sim!




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Old Apr 30, 2012, 12:00 AM
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is hk250 quality trusthworthy? Any parts that I need to change with Align parts? thanks.
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Old Apr 30, 2012, 12:53 AM
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for basic flying mild sport 3D, just the tail belt, replace it with kevlar(250 super tail belt ebay), the main blades with pro 3D CF blades, and get a good mems gyro like the Spartan Quark, or the HB790 or the tarot GY550 gyro. Also give everything a clean and pull everything apart. Clean the screws and bolts with alcohol allow to dry and rethreadlock everything metal to metal. And oil up the bearings. If you follow ALL of finless bob 250 and 450 videos, you should be good to go. For mild sport HS 4000-4200 check my profile for details.

Some say the HK250GT is a skya brand, so preety much what ever the skya is that is what the HK250GT is. All the best.

P.S make sure you calculate your desired HS prior to buying the pinion and motor


that my 2 cents.
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Last edited by pitchp; Apr 30, 2012 at 01:03 AM.
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Old Apr 30, 2012, 01:43 AM
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and get a real align feathering shaft...
(i have had a feathering shaft break on me, and its dangerous...)
its a cheap part.
So as Pitchp says, get the kevlar belt, or at least align original and the feathing shaft. These are the two items that must be replaced.
The rest, see how you go.
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Old Apr 30, 2012, 01:59 AM
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Quote:
Originally Posted by pitchp View Post
for basic flying mild sport 3D, just the tail belt, replace it with kevlar(250 super tail belt ebay), the main blades with pro 3D CF blades, and get a good mems gyro like the Spartan Quark, or the HB790 or the tarot GY550 gyro. Also give everything a clean and pull everything apart. Clean the screws and bolts with alcohol allow to dry and rethreadlock everything metal to metal. And oil up the bearings. If you follow ALL of finless bob 250 and 450 videos, you should be good to go. For mild sport HS 4000-4200 check my profile for details.

Some say the HK250GT is a skya brand, so preety much what ever the skya is that is what the HK250GT is. All the best.

P.S make sure you calculate your desired HS prior to buying the pinion and motor


that my 2 cents.
thank you, pitchp

Quote:
Originally Posted by RandomBob View Post
and get a real align feathering shaft...
(i have had a feathering shaft break on me, and its dangerous...)
its a cheap part.
So as Pitchp says, get the kevlar belt, or at least align original and the feathing shaft. These are the two items that must be replaced.
The rest, see how you go.
thank you, bob.

Never know that the belt need to change. I thought hk belt should be ok.
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Old Apr 30, 2012, 02:27 AM
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These belts a renowned for failing within the first 10 flights.
A lot of people mention first 3 flights. So to save the hassle of building, then basically crashing before its tuned in (and replacing other parts) its better (and cheaper) to just swap it out....

If you look at the start of this thread, you will see a lot of reports..
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Old Apr 30, 2012, 06:31 AM
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Mixing arms

Quote:
Originally Posted by rchobbyfly View Post
is hk250 quality trusthworthy? Any parts that I need to change with Align parts? thanks.
Mixing Arm: HK (and other clones?) have mixing arms with bushings that wear out. I bought Align mixing arms that use ball bearings and then fabricated mixing arms with bearings for my other 250s with common sized bearings. The head is a lot tighter with bearings rather than bushings.

A CF tail boom will stay adjusted a lot better than an Al one, too.

And get some Tarot skids. Yellow skids are near unbreakable.
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Old Apr 30, 2012, 08:28 AM
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New align servos!

DS415M Digital Servo Cyclic Use




Price: USD$24.99

Instruction:
● Faster speed with high torque performance, allowing helicopter to perform with faster and higher precision.
● High rigidity, shock resistant metal gears with high strength composite alloy gears with durable structure characteristics.
● Aluminum alloy mid case construction for instantaneous heat dissipation, maintaining servos high efficiency.
● Supports digital & analog control signal.
● Powerful and precise servo, suitable for T-Rex 250/450 CCPM cyclic use.

Specification:
● Stall torque:2.0kg.cm(4.8V) 2.4kg.cm(6.0V)
● Motion speed:0.1sec/60(4.8V) 0.08sec/60(6.0V)
● Rating voltageC 4.8-6.0V
● Temperature range:-20C~+60C
● Dimension:22.9 x 12 x 25.8mm
● Weight:13.9g
● 1520μs standard band


DS425M Digital Servo Rudder Use



Price:USD$24.99

Instruction:
● Faster speed with high torque performance, allowing helicopter to perform with faster and higher precision.
● High rigidity, shock resistant metal gears with high strength composite alloy gears with durable structure characteristics.
● Aluminum alloy mid case construction for instantaneous heat dissipation, maintaining servos high efficiency.
● Supports digital & analog control signal.
● Powerful and precise servo, suitable for T-Rex 250/450 rudder use.

Specification:
● Stall torque:1.0kg.cm(4.8V) 1.2kg.cm(6.0V)
● Motion speed:0.09sec/60(4.8V) 0.05sec/60(6.0V)
● Rating voltageC 4.8-6.0V
● Temperature range:-20C~+60C
● Dimension:22.9 x 12 x 25.8mm
● Weight:13.9g
● 1520μs standard band
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Old Apr 30, 2012, 08:35 AM
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a new shop selling hk products.

http://helimodels.com.ar/category.php?id_category=5

HK 250 GT HELIMODELS (1 min 47 sec)
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Old Apr 30, 2012, 11:43 AM
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Kauai
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Quote:
Originally Posted by pitchp View Post
New align servos!

DS415M Digital Servo Cyclic Use




Price: USD$24.99

Instruction:
● Faster speed with high torque performance, allowing helicopter to perform with faster and higher precision.
● High rigidity, shock resistant metal gears with high strength composite alloy gears with durable structure characteristics.
● Aluminum alloy mid case construction for instantaneous heat dissipation, maintaining servo’s high efficiency.
● Supports digital & analog control signal.
● Powerful and precise servo, suitable for T-Rex 250/450 CCPM cyclic use.

Specification:
● Stall torque:2.0kg.cm(4.8V) 2.4kg.cm(6.0V)
● Motion speed:0.1sec/60(4.8V) 0.08sec/60(6.0V)
● Rating voltageC 4.8-6.0V
● Temperature range:-20C~+60C
● Dimension:22.9 x 12 x 25.8mm
● Weight:13.9g
● 1520μs standard band


DS425M Digital Servo Rudder Use



Price:USD$24.99

Instruction:
● Faster speed with high torque performance, allowing helicopter to perform with faster and higher precision.
● High rigidity, shock resistant metal gears with high strength composite alloy gears with durable structure characteristics.
● Aluminum alloy mid case construction for instantaneous heat dissipation, maintaining servo’s high efficiency.
● Supports digital & analog control signal.
● Powerful and precise servo, suitable for T-Rex 250/450 rudder use.

Specification:
● Stall torque:1.0kg.cm(4.8V) 1.2kg.cm(6.0V)
● Motion speed:0.09sec/60(4.8V) 0.05sec/60(6.0V)
● Rating voltageC 4.8-6.0V
● Temperature range:-20C~+60C
● Dimension:22.9 x 12 x 25.8mm
● Weight:13.9g
● 1520μs standard band
Would these be Savox servos?They look A little heavy for a 250 and a little weak for a 450 fbl.I almost ordered Savox but there seems to be alot of people who didn't have very good luck with them.For my 450 I used The kstds115mg servo at 6v,great servo if you don't crash.For my Beam 450 I'm putting in the Kds n300 which looks like the Kst but not as smooth.Ive used both as a tail servo and both failed in a short time,(motor ,never got warm?)They work good for cyclic but main shaft shears off easliy.I wanted to try the Turngy version but Hobbyking has been out for awhile.Kdsn300 from Myrcmart $25 ea.My favorite 250 cyclic servo is the Exi213 mg,and for the tail is Hyperion ds09mg.
Steve
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Last edited by Kauaiguy; Apr 30, 2012 at 12:16 PM. Reason: Add info
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Old Apr 30, 2012, 05:03 PM
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There's a few align servo pilots here, i just thought they would be interested. I've got DS919mg, turnigy ds480, and emax es9257 and they are doing fine for me.
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Old Apr 30, 2012, 05:59 PM
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Turnigy dlux 20A SBEC



Data logging display parameters:
Max Temperature
Environment Temperature
Max Current
Min Current
Max Voltage
Min Voltage
Nominal Voltage
Off Voltage
Motor Run Time
Power on Time
Motor Pole Number
Max Motor RPM
Error Times

Spec.
Max Cont. Current: 20A
Max Burst Current: 30A
Max BEC Current: 2A
BEC Voltage: 5.5v
LiPo: 2~6S
NiMH: 5~12cells
Weight: 22grams
Max RPM (2-pole): 200,000rpm
Size: 51 x 27 x 11mm
Motor Plug: Female 3.5mm bullet Connector
Battery Plug: Nil

Features.
Extremely low internal resistance
Very low operation temperature
Over temperature protection
APEC MoSfets (Taiwain)

Programming Options.
Battery Type: 2S~6S
Forward/Reverse
Soft Start
LV Cut off Type (Ignore, Reduce Power, Stop Motor)
LV Cut off setting (2.5~3.5v in 0.1v increments)
Timing (Auto, Medium, High)
Switching (8,16kHz)
Factory Restore
Active RPM Control: On/Off (Governor Mode)

Default factory settings.
Brake: off
Battery: LiPo Auto Detect
Low Voltage: 3.2v (power down motor)
Timing: Auto
Frequency: 8KHz


It would be nicer if it was a 6V switching BEC
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Last edited by pitchp; Apr 30, 2012 at 06:08 PM.
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Old Apr 30, 2012, 07:13 PM
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Kauai
Joined Jan 2011
4,082 Posts
Quote:
Originally Posted by pitchp View Post
There's a few align servo pilots here, i just thought they would be interested. I've got DS919mg, turnigy ds480, and emax es9257 and they are doing fine for me.
I ran the Emax 9257 on my 250 when I was trouble shooting gyro problems back when I had the Assan ga 250.Its just so large ,looks out of place but did make the gyro behave better.The align guys probably already know if there any good.When I did a Goggle search the opinions where so mixed I didn't feel like I wanted to take the chance!Thanks for sharing,I've bought alot of stuff from you links!
Steve
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Old Apr 30, 2012, 07:17 PM
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yeah that's the thing steve. the 9257 is really huge but it really does a good job at holding the tail, so i'll leave it there. Would i do it again? most likely considering the price value of the servo is really cheap. As you know I'm always up for anything cheap and nasty.
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