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Old Oct 02, 2009, 10:03 PM
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akschu's Avatar
USA, AK, Houston
Joined Aug 2005
776 Posts
So I have the heli ordered, but I need to get some gear coming for it. Any suggestions on servos and a motor? I'll probably run a turnagy ESC since I have the programmer and like it, and as far as the gyro goes, I'll probably get something more high end since they can always be moved to bigger helis and the gyro has everything to do with how it flys.

schu
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Old Oct 02, 2009, 11:07 PM
Excellence is Expected
MakMov's Avatar
Aurora, Colorado
Joined Nov 2005
3,736 Posts
Quote:
Originally Posted by lovespicyfood
Just to clarify, is this the HK250GT or the standard HK250? I'm seriously considering one of these for a small field inverted hover trainer, but I'm weighing a real T-Rex250...

Thanks!

That would be = to the GT
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Old Oct 02, 2009, 11:19 PM
d3x
Registered User
Joined Jan 2009
28 Posts
Hi, i have two questions for those who are more aware what will fit in and work and what will not. Is this setup ok for normal flying (no 3d or invert) and what servo would you recommend for a tail (preferably from HobbyKing)

HK-T250 CCPM Electric Helicopter Kit $29.99 499g
Hextronik MG-14 14g/2.2kg/0.11sec aircraft servo $23.85 75g
Turnigy 2627 Brushless Outrunner 3800kv $12.01 82g
TURNIGY Basic 25A v3.1 Speed Controller $15.49 45g
Spektrum AR6100 (have a spere one)
GY401 + ??? Servo (same here, have spare one)
Z8003S20C - ZIPPY Flightmax 800mAh 3S1P 20C


dexter
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Old Oct 03, 2009, 12:05 AM
flying with dx7...
futabafreak's Avatar
USA, MD, Westminster
Joined Aug 2006
656 Posts
I have yet to get my hk250 and Im already looking for parts lots and used trex 250s on ebay and I came across this anyone know anything about using a flybarless head on a 250?
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Old Oct 03, 2009, 06:37 AM
Registered User
Sir J David's Avatar
Sweden
Joined Dec 2007
473 Posts
Quote:
Originally Posted by d3x
Hi, i have two questions for those who are more aware what will fit in and work and what will not. Is this setup ok for normal flying (no 3d or invert) and what servo would you recommend for a tail (preferably from HobbyKing)

HK-T250 CCPM Electric Helicopter Kit $29.99 499g
Hextronik MG-14 14g/2.2kg/0.11sec aircraft servo $23.85 75g
Turnigy 2627 Brushless Outrunner 3800kv $12.01 82g
TURNIGY Basic 25A v3.1 Speed Controller $15.49 45g
Spektrum AR6100 (have a spere one)
GY401 + ??? Servo (same here, have spare one)
Z8003S20C - ZIPPY Flightmax 800mAh 3S1P 20C


dexter
Go for the mks ds-480 for the tail. I use it at a 450 and will start use them at my 250's as well. It's abut $25 at hobbycity
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Old Oct 03, 2009, 11:26 AM
I Can Fly An FP Inverted!
Hal_The_Hacker's Avatar
Teddington, Middlesex, UK
Joined Jun 2008
1,536 Posts
Quote:
Originally Posted by futabafreak
I have yet to get my hk250 and Im already looking for parts lots and used trex 250s on ebay and I came across this anyone know anything about using a flybarless head on a 250?
I run a flybarless set up on one of my 180 class helis, and it flies OK, though ideally you want a 3 axis gyro, which adds a lot of weight.

its not really worth it on a heli as small as this, any weight/drag you save in the head, you will add with the 3 axis system.

I have not tried my flybarless 180 in forward flight, thats how little I trust it, i would never attempt to 3d it
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Old Oct 03, 2009, 11:57 AM
Registered User
United States, NJ, Manville
Joined May 2006
1,562 Posts
Helidirect sells a flybarless head for the T-rex 250

http://www.helidirect.com/microheli-...50-p-14149.hdx
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Old Oct 03, 2009, 01:34 PM
Nitro Freak
Dark-Angel's Avatar
Canada, Quebec, Saguenay
Joined Jul 2008
540 Posts
Quote:
Originally Posted by Hal_The_Hacker
60g is on the light side of things, 75g is average i reckon, but 95g is definately on the heavy side

a 4s 250 sounds pretty cool, now you got me wanting one

or maybe a 6s 250.......

hmmmm
yep, wont go 3s finaly.. ive choosen to go the 4s route(dual 2s pack) 600-610 mah will weight around 70g - ~35g each pack

so ill be able to use the 2s packs in my other helis.
my 900mah packs are abit heavy for the ff200 anyways.. have to fly w/o canopy.. the 600 should be just fine.
i like when my helis can share their batteries.

6s seem abit overkill though
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Old Oct 03, 2009, 03:04 PM
Heli Hooligan
London
Joined Dec 2006
6,049 Posts
You will need an ESC capable of 4s. Many claim 4s but if they have a linear BEC then you will need to disable it and run an external BEC. If it has a switching BEC and the ESC claims 4s then the BEC should be good for 4s too.
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Old Oct 03, 2009, 03:29 PM
Team Mulikow 3D
Oxfordshire, UK
Joined Jan 2007
3,901 Posts
I think that you will struggle to fit the batteries in and get the canopy on with a senssible CoG using 4S
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Old Oct 03, 2009, 05:12 PM
Registered User
Joined Oct 2007
2 Posts
Quote:
Originally Posted by tornadorc
what HS do you need? are you going to be using the 15T pinion?
I want to use 15T pinion and a good HS for sport fly. The only ones I found are the originals Align 250, Align 250S and Scorpion 2206-3900.
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Old Oct 03, 2009, 09:41 PM
Registered User
Lake City, PA USA
Joined Sep 1999
326 Posts
For anybody building the base kit:

Anybody notice the main gear is a bit out of round so that it is pretty stiff in spots with the tail drive, or is it just mine.

Also, The bottom end of the main shaft was too big for the bearing in the main gear. I chucked the main shaft into my drill press and cleaned up the end of the shaft with some 220 wet or dry and got everything to fit.

FWIW, my motor mount was put in upside down at the factory. No biggie, but if you dont know...

Finally, I got the recommended 3500 kv motor but it is lots bigger than the Align on my "real" t-rex. It still fits, but is heavier. I may look for a smaller motor since this will be an indoor flyer and I am hoping for lighter...

I am using htx900 servos which are working out fine so far. All three installed in frame and head & linkage mounted.

Gene
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Old Oct 04, 2009, 12:07 AM
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Joined Jun 2005
77 Posts
also reserved
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Old Oct 04, 2009, 02:08 AM
new pilot - micro addict
UH -1H's Avatar
Singapore
Joined Jul 2007
246 Posts
yummy...


Subscribled
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Old Oct 04, 2009, 08:52 AM
Redjestird Youser
SidewaysLS4's Avatar
Joined Jan 2009
3,808 Posts
Quote:
Originally Posted by skizziks
Helidirect sells a flybarless head for the T-rex 250

http://www.helidirect.com/microheli-...50-p-14149.hdx

That thing scares the living daylights out of me. I see how my Microheli T250 tail pitch arm is wearing a groove into the Microheli slider...if they are using the same grade aluminum that thing might be a big headache.
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