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Old Nov 23, 2010, 06:50 PM
Can't-Get-Right
tedwearsahat's Avatar
Souf' East UK
Joined Aug 2008
81 Posts
Hello all, I am trying to come up with a solution for a mate who is keen to try CP helis but does not want to spend a fortune. He has good mechanical knowledge so I see a kit as no issues for him. I have looked through this and the previous thread and come up with the following HK solution (bar RX and TX).

What do you guys think:

Kit:
http://www.hobbyking.com/hobbyking/s...dProduct=12390

Looks like a bang on copy of the Align T-Rex V2 which used to be the leading 325mm heli on the market.
36.29 USD

Motor:
Turnigy Typhoon 450H 2218H Heli Motor 3450kv (450 class)
http://www.hobbycity.com/hobbycity/s...idProduct=9257
12.42 USD

ESC:
TURNIGY Sentry 40amp Speed Controller
http://www.hobbycity.com/hobbycity/s...idProduct=3729
20.91 USD

Cyclic Servos
HobbyKing 939MG Metal Gear Servo 2.5kg/ 12.5g/ 0.14sec
http://www.hobbyking.com/hobbyking/s...dProduct=14458
4.06 USD (x 3 = 12.18 USD)

Tail Servo:
Power HD 3688HB Digital Servo 25g/2.8kg/.07sec
http://www.hobbyking.com/hobbyking/s...idproduct=6775
20.80 USD

Gyro:
Hobby King 401B AVCS Digital Head Lock Gyro

http://www.hobbyking.com/hobbyking/s...dProduct=10113
12.79 USD

Blades:

Cheap Woodies:
http://www.hobbyking.com/hobbyking/s...dProduct=14011
2.79 USD

OK Carbons:
http://www.hobbycity.com/hobbycity/s...dProduct=10820
7.39 USD

Batteries:
Flightmax 2200 mah 25C
http://www.hobbyking.com/hobbyking/s...dProduct=13931

Connectors:
http://www.hobbyking.com/hobbyking/s...idProduct=9572

3.19 USD for the connectors and 11.86 USD per battery.

GRAND TOTAL (inc. all of the above and 3 sets of woodies, 1 set of CF blades, 2 batteries and connectors for the ESC)
158.06 USD

At 1.578 USD to 1 GBP this is 100.10 GBP + postage and packing + customs charges.

The only thing I am not sure about is the gyro, I have always thought that a gyro is the only place where it is not cost effective to skimp as a poor hold on the tail is a frustration more than anything.

Not sure about the woodies either but for the initial learning to hover tail in stage they seem 'good enough'.

What do you guys think of this setup as a first CP heli?
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Old Nov 23, 2010, 06:55 PM
I don't want to "Switch Now"
pmackenzie's Avatar
Toronto (Don Mills), Canada
Joined Dec 2002
16,963 Posts
Try the 401. They can work quite well, although they will possibly have some slight drift that you have to trim out.

If you can't get it to work then go with plan B and get a good gyro, like a real 401 or a Quark.

FWIW, that tail servo is huge. I would get something smaller.

Pat MacKenzie
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Old Nov 23, 2010, 08:01 PM
Can't-Get-Right
tedwearsahat's Avatar
Souf' East UK
Joined Aug 2008
81 Posts
Hi Pat. Thanks for the response.

Do you mean the 401b linked in my post above? For 12 bucks it seems worth a go. I fly with Spartan tails on both my helis so I am spoilt but the 401b sounds like it will hold enough for learning orientations and forward flight.

With the tail servo it is the same size as the DS8910 that I use on my B400 and it is fine. I know it is over kill but tuning a tail can be a pain so I have always taken the view that a servo one size larger is no bad thing on the tail.

Are the rest of the components going to work OK with the kit?

Thanks again.
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Old Nov 23, 2010, 08:02 PM
Not a six pack
rocketscience's Avatar
USA, IL, Chicago
Joined Jul 2008
5,298 Posts
Quote:
Originally Posted by pmackenzie View Post

FWIW, that tail servo is huge. I would get something smaller.

Pat MacKenzie
It holds like a rock. Same size servo used by the Pro. On a v2 though, it will be a little tail heavy. Certainly not necessary for hovering.
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Old Nov 23, 2010, 08:10 PM
Dyslexic crash pro!
Westminster, CO
Joined Jun 2008
1,556 Posts
I've had good luck so far with the HK 401b (I have 2). It drifts some but for the price, it's great! Make sure you do the bit-o-foam in the gyro case mod to it and check the solder points first. The woodies are good to start too, he'll tear up less since they are the weak point. The Align woodies are decently priced and pretty consistant. Having never tried them, I can't vouch for these. The 2218H works well too. You might try this tail servo instead. I have one that's doing fine.

http://www.hobbycity.com/hobbycity/s...idproduct=8511

The rest looks good to start and to grow with.

/Dave
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Old Nov 23, 2010, 08:54 PM
Can't-Get-Right
tedwearsahat's Avatar
Souf' East UK
Joined Aug 2008
81 Posts
Quote:
Originally Posted by rocketscience View Post
It holds like a rock. Same size servo used by the Pro. On a v2 though, it will be a little tail heavy. Certainly not necessary for hovering.
Thanks rocketscience. How tail heavy are we talking? Is it adjust the battery forward or extend the battery tray tail heavy?

Quote:
Originally Posted by loopy1 View Post
I've had good luck so far with the HK 401b....Make sure you do the bit-o-foam in the gyro case mod to it and check the solder points first. The woodies are good to start too, he'll tear up less since they are the weak point. The Align woodies are decently priced and pretty consistant. Having never tried them, I can't vouch for these.....You might try this tail servo instead. I have one that's doing fine.

http://www.hobbycity.com/hobbycity/s...idproduct=8511
Cheers Dave. Any links to a step by step 401b modding guide?

Thanks for the tail servo heads up, looks like that model might address the CoG issue mentioned above.

I have similar concerns about the woodies so I might recommend the Align Pros ultimately but for the price it can't hurt to order a couple of pairs to see what they are like.

Thanks again all.
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Old Nov 23, 2010, 09:48 PM
Dyslexic crash pro!
Westminster, CO
Joined Jun 2008
1,556 Posts
I can't remember where I found it (probably somewhere in this thread back in the gyro discussions), but all I do is open up the gyro, check the solder points (mine were good) and then cut a small piece of packing foam to fit. A little large on the foam is good, as long as you can get the case back together without stripping the little screws (in which case, go with slightly longer, slightly bigger screws. not too big or you crack the corners of the case). Then stuff the foam in there and put it back together and it's done. You're just trying to damp out the vibrations of the little pc board because, at least in my case, I felt that the factory foam was inadequate. Seems to have helped the drift for some who've done this.
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Old Nov 23, 2010, 10:41 PM
Not a six pack
rocketscience's Avatar
USA, IL, Chicago
Joined Jul 2008
5,298 Posts
Quote:
Originally Posted by tedwearsahat View Post
Thanks rocketscience. How tail heavy are we talking? Is it adjust the battery forward or extend the battery tray tail heavy?
I'd say you will end up with about a 1" (2.5cm) gap between the battery and the frame on a 3S 2200.
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Old Nov 24, 2010, 02:06 AM
Registered User
Joined May 2009
121 Posts
Bargain Spektrum Gear? or maybe not??

Ok Guys here what i have emailed to me.... I am on a Chinese industrial mailing list for trade buying...What you think???? Koko technology
Attention: Horizon Hobby has confirmed that all Spektrum Products being sold by KoKo Technology are counterfeit. We consider it a danger to use these products, waive all liability and will not support any warranty or service in regards to them. Koko tech are making Dx6is and ar6100 and ar6200..
selling Dx6i and ar6100 combo for $108
I dont need anything yet as I bought the £5 HK orange RXs but hey....
Cheers Mike Hoppett...( think I have succeded in getting a mate hooked on helis he is training with basic Plasic Hk450..he said it was like drugs but more expensive....Heard that before somewhere tho..HaHa)
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Last edited by mikehoppett; Nov 24, 2010 at 02:22 AM. Reason: attachments missing
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Old Nov 24, 2010, 02:16 AM
Yes, I know it's upside down.
Sydney, Australia
Joined Dec 2008
3,312 Posts
Quote:
Originally Posted by mikehoppett View Post
Ok Guys here what i have emailed to me.... I am on a Chinese industrial mailing list for trade buying...What you think????
I dont need anything yet as I bought the £5 HK orange RXs but hey....
Cheers Mike Hoppett...( think I have succeded in getting a mate hooked on helis he is training with basic Plasic Hk450..he said it was like drugs but more expensive....Heard that before somewhere tho..HaHa)
What exactly is being asked here?
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Old Nov 24, 2010, 03:51 AM
Registered User
UK
Joined May 2007
3,204 Posts
Quote:
Originally Posted by tedwearsahat View Post
Hello all, I am trying to come up with a solution for a mate who is keen to try CP helis but does not want to spend a fortune. He has good mechanical knowledge so I see a kit as no issues for him. I have looked through this and the previous thread and come up with the following HK solution (bar RX and TX).

What do you guys think:

Kit:
http://www.hobbyking.com/hobbyking/s...dProduct=12390

Looks like a bang on copy of the Align T-Rex V2 which used to be the leading 325mm heli on the market.
36.29 USD

Motor:
Turnigy Typhoon 450H 2218H Heli Motor 3450kv (450 class)
http://www.hobbycity.com/hobbycity/s...idProduct=9257
12.42 USD

ESC:
TURNIGY Sentry 40amp Speed Controller
http://www.hobbycity.com/hobbycity/s...idProduct=3729
20.91 USD

Cyclic Servos
HobbyKing 939MG Metal Gear Servo 2.5kg/ 12.5g/ 0.14sec
http://www.hobbyking.com/hobbyking/s...dProduct=14458
4.06 USD (x 3 = 12.18 USD)

Tail Servo:
Power HD 3688HB Digital Servo 25g/2.8kg/.07sec
http://www.hobbyking.com/hobbyking/s...idproduct=6775
20.80 USD

Gyro:
Hobby King 401B AVCS Digital Head Lock Gyro

http://www.hobbyking.com/hobbyking/s...dProduct=10113
12.79 USD

Blades:

Cheap Woodies:
http://www.hobbyking.com/hobbyking/s...dProduct=14011
2.79 USD

OK Carbons:
http://www.hobbycity.com/hobbycity/s...dProduct=10820
7.39 USD

Batteries:
Flightmax 2200 mah 25C
http://www.hobbyking.com/hobbyking/s...dProduct=13931

Connectors:
http://www.hobbyking.com/hobbyking/s...idProduct=9572

3.19 USD for the connectors and 11.86 USD per battery.

GRAND TOTAL (inc. all of the above and 3 sets of woodies, 1 set of CF blades, 2 batteries and connectors for the ESC)
158.06 USD

At 1.578 USD to 1 GBP this is 100.10 GBP + postage and packing + customs charges.

The only thing I am not sure about is the gyro, I have always thought that a gyro is the only place where it is not cost effective to skimp as a poor hold on the tail is a frustration more than anything.

Not sure about the woodies either but for the initial learning to hover tail in stage they seem 'good enough'.

What do you guys think of this setup as a first CP heli?
I would go with http://www.hobbyking.com/hobbyking/s...dProduct=11911 batteries instead. Same price better spec. Also, even though being 3x price carbon blades are easier on battery motor and slightly more robust in crashes (blade scrapes, etc)... Also, longer term, going with Scorpion motor is not bad idea and difference in price is going to pay
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Old Nov 24, 2010, 03:53 AM
Registered User
Sweden
Joined Jan 2010
567 Posts
Quote:
Originally Posted by clicky View Post
I would go with http://www.hobbyking.com/hobbyking/s...dProduct=11911 batteries instead. Same price better spec. Also, even though being 3x price carbon blades are easier on battery motor and slightly more robust in crashes (blade scrapes, etc)... Also, longer term, going with Scorpion motor is not bad idea and difference in price is going to pay
Thats only because he ordered from the DE warehouse I believe.
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Old Nov 24, 2010, 04:13 AM
Registered User
UK
Joined May 2007
3,204 Posts
Ah, I see... It, then, makes sense. BTW - we need nanotech batteries in DE warehouse! A lot of them, too!
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Old Nov 24, 2010, 04:34 AM
The art of airbrush
Österreich
Joined Jul 2010
83 Posts
Quote:
Originally Posted by tedwearsahat View Post
Any links to a step by step 401b modding guide?
Yes: http://sergio.salvi.ca/2009/10/18/my...modifications/
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Old Nov 24, 2010, 05:46 AM
Can't-Get-Right
tedwearsahat's Avatar
Souf' East UK
Joined Aug 2008
81 Posts
Quote:
Originally Posted by loopy1 View Post
I can't remember where I found it (probably somewhere in this thread back in the gyro discussions), but all I do is open up the gyro, check the solder points (mine were good) and then cut a small piece of packing foam to fit. A little large on the foam is good, as long as you can get the case back together without stripping the little screws (in which case, go with slightly longer, slightly bigger screws. not too big or you crack the corners of the case). Then stuff the foam in there and put it back together and it's done. You're just trying to damp out the vibrations of the little pc board because, at least in my case, I felt that the factory foam was inadequate. Seems to have helped the drift for some who've done this.
Thanks Dave,much appreciated.

Quote:
Originally Posted by rocketscience View Post
I'd say you will end up with about a 1" (2.5cm) gap between the battery and the frame on a 3S 2200.
So hanging off the battery tray a little but not an insurmountable problem by the sounds of it.

Quote:
Originally Posted by clicky View Post
I would go with http://www.hobbyking.com/hobbyking/s...dProduct=11911 batteries instead. Same price better spec. Also, even though being 3x price carbon blades are easier on battery motor and slightly more robust in crashes (blade scrapes, etc)... Also, longer term, going with Scorpion motor is not bad idea and difference in price is going to pay
I've not been overly impressed with the nano techs compared to the Flightmax. I'm not sure the extra oomph is worth the extra weight. II'm a weight fiend though, I am actually planning on trying higher discharge but lower mah batteries on my B400, 1800 40C or something of the like.

Regarding CF blades, I personally think a learner pilot doesn't need robust blades they need something that will act as fuse when the inevitable unscheduled ground to heli meeting happens.

When I put CF blades on my bird I started damaging blade grips. Though having said that when I put CF blades on I was at a stage where my crashing had become inevitably more spectacular.

Do you think a Scorpion is worth the extra cash for a guy totally new to CP helis? Seems like overkill on a 35 USD airframe?

Quote:
Originally Posted by sandos View Post
Thats only because he ordered from the DE warehouse I believe.
Bang on, wrong link included in my post. It is likely he will order batteries and kit from the EU warehouse as they are the bulkiest items and I suspect the p + p saved will make up for the slight price difference.

Quote:
Originally Posted by rcpaintworks View Post
Thanks rcpw. Nice guide.

Thanks for all your help folks.
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