HDX 450 Build Videos will be here

[BarnOwl]

I would go for the Align 450 SE. Allthough the HDX is a very good bird out of the box, overall quality of the Align products is way ahead of the HDX stuff.
Most people here that fly the HDX for a longer time ended up upgrading to Align alu parts anyway. (Including me)
The best part of the HDX is the G10 frame, but you can always get that separately if you wish.

[deej]

Thanks BarnOwl,
It is amazing how much advertising has been done for the HDX Heli. Apparently there is a large margin of profit on it for the heli dealers.

Actually the real name is 3DX as you can see here:
http://www.3dx450.com/html/contact.html
The heli is made in China and it can be found under various names: HDX,3DX,Raven,Nemesis

[tpp1971]

What build video do I follow for the Trex 450 SE?

[Finless]

The Trex vids...

Bob

[ps61785]

i have a align 430L 3550kV motor and im wondering what would be the best pinion to run with this setup. I have a CC Pheonix 35 with a 11.1v 20c battery. Thanks for any help...

[broke-again]

i have a align 430L 3550kV motor and im wondering what would be the best pinion to run with this setup. I have a CC Pheonix 35 with a 11.1v 20c battery. Thanks for any help



I'd say start with 13T and see how it performs, (I started using 11T then 13T, which im happy with) you can always change up or down if you feel it's required.

[ps61785]

i have the 13 tooth in it too...but i was just trying to get a feel for what others were running...

[vapochilled]

Hi all,
I picked up an HDX from HD on evilbid before christmas for a song, and I'm having some issues with the head setup
I have HS-65mg's on the cyclic, but with the servo arms out at 90o, when I pull full back on the left stick, and then go full right on the right stick, I'm getting binding.
I used the build vids here(thank god for finless!).
I'm at about 13mm out from the servo shaft as directed.
I have the swash set at 60% (DX7, great radio btw)
I also am not getting + - 11o, I'm only getting 9o will that be enough for basic flight? I only have a couple of dozen flights under me on my Cp Pro(or the nervous wreck as I call it :) )
One other thing, the tail pitch control rod had very lose, unglued rod ends, I've CA'd them onto the rod is that ok?
I have had it hovering, but only for a few seconds, as I was running an E-Flight 800maH lipo, that got pretty warm, pretty quickly! :WOW
Seemed stable, compared to the CPP anyway, looking forward to getting it done.
Just need to iron out the head issues.

for the record, I'm running a DX7 with HS-65mg's, up front with a DS3400g and GY401 on the tail. Stock motor(13T) with an Align 35A ESc.
All in all, I'm happy with it for the price I paid($175) main gears are awful, waiting to see if I get a response from HD. There were a few nuts and bolts missing and some of the Ali parts had missing threads :arggg: which caused some fun, but in general it's a good little kit. Just hope it flies well

[broke-again]

when I pull full back on the left stick, and then go full right on the right stick, I'm getting binding.


I assume the same thing happens if you go full left? I had a similar issue with my HDX, at the end of the day i dont fly inverted at full negative, so dont see it as a major issue for myself. I fit really does bug you, experiment with your swash / end point & pitch values and see if that helps.

I'm only getting 9o will that be enough for basic flight?


More that enough IMHO. If your just starting out you wont need much in the way of negative pitch either unless your doing 3d, the higher the neg pitch value, the more likely you are to slam it into the ground if you ever panic and drop the throttle. Maybe you should consider starting with +1 or 2 at neg.

One other thing, the tail pitch control rod had very lose, unglued rod ends, I've CA'd them onto the rod is that ok?

Yes that should help. I even went so far as to use some shrink tubing on either joint as back up.

The HDX is a fun Heli, enjoy!

[vicsalt]

HELP !!!!!
Just built my 3dfx but have a problem with motor and blades
I have version 4 with the motor mounted on top the frame. The two gears , bottom gear aligned to the tail rotor gear. The top gear aligned with the motor. as instructions.
What happens: when the motor rotates anticlockwise the main gear (top) just slips and rotor doesnt turn. if i manually twist the motor clockwise the gears turn and the rotors but in the wrong direction.

Which direction should the motor turn ? thus if mounted ontop frame, looking down on top of motor.

Another point i dont understand is the outer casing of the motor rotates, is this right ?
I will post some pics tomorrow as its gone midnight in the UK

[Finless]

SWAP 2 wires to the motor and all fixed!

Bob

[vapochilled]

when I pull full back on the left stick, and then go full right on the right stick, I'm getting binding.


I assume the same thing happens if you go full left? I had a similar issue with my HDX, at the end of the day i dont fly inverted at full negative, so dont see it as a major issue for myself. I fit really does bug you, experiment with your swash / end point & pitch values and see if that helps.

I'm only getting 9o will that be enough for basic flight?


More that enough IMHO. If your just starting out you wont need much in the way of negative pitch either unless your doing 3d, the higher the neg pitch value, the more likely you are to slam it into the ground if you ever panic and drop the throttle. Maybe you should consider starting with +1 or 2 at neg.

One other thing, the tail pitch control rod had very lose, unglued rod ends, I've CA'd them onto the rod is that ok?

Yes that should help. I even went so far as to use some shrink tubing on either joint as back up.

The HDX is a fun Heli, enjoy!

Hey,

In the end one of the guys over at helimag found a thread here about it. I have cut the small piece out of the frame and now get full swing in both pos and neg, no binding. Thanks broke again

[vicsalt]

Sorry Bob
I have now swopped motor wires round and yes thr rotors now spin.
My only problem its in the wrong direction (anticlockwise if looking down on rotors).

Is the needle bearing within the main gears a 'one way bearing' should it go one way?
Could this be the problem or could it even be u/s althougth I have only powerd up the kit a couple of times.

The version heli i have can be seen here:-
http://www.cnchelicopter.com/servlet/the-82/450-eccpm-fiber-frame-dsh--dsh-silver%28Trex-fdsh-3dx450B%29/Detail

The image shows the gears I have - how do they work


Thanks again for your help

[Finless]

Yep... sounds like the one way bearing is in backwards!

Get the Align removal tool and remove it. I have a video explaining how to do that in my Trex section.

Bob

[vicsalt]

Well changed the bearing round and seemed OK. On initial power up of rotors i still felt there was some sort of slipping issue. Then something happened almost as if something decided to bite and the rotors span as I imaged they should have. I played around abit, did get the thing of the ground but with no real control due to my inexperience. Did try several times but do need to get the thing more stable and fins a bit bigger area.

Points .
The wooden blades damage very easily
:roll:

Since the original kick in of the blades rotating properly i seem to notice on moving the throttle the blades rotate sort of irrationally as if the motor of something is snagging for want of a better word.
They snag on and off and then eventually catch and rotate as should. I think I have the otter esc set right with no break etc but I was just wondering if what I'm seeing is something to do with this.

On manually rotating the head everything seems fine, no tying up etc.

[vicsalt]

I have watched the finless videos and think i have this right but would like to check.

the yellow lines marked on the image represent the relevant parts and those parts should all be parallel at center stick ?

Ive used the machined flat on the blade grips as refferance for the blades.

am i right in saying for an biginner the blades should tilt +8/10 deg at full throttle?



thanks for your help

[BarnOwl]

That should be spot on, vicsalt! 10 degrees pitch over and under should be ok to start with. If you start of on normal curves don't forget to set something like 40-45-50-75-100
pitchcurve so you will be having about -1 or -2 degree negative pitch sitting on the ground (as shown in the curves video)

When is the maiden?

[Finless]

Only thing I notice in the picture is the washout arms should also have a yellow line through them. Yours are NOT quite straight accross from each other. The elbow link arm is higher than the ball link arm.

Bob

[backman8571]

I question to you all and Finley

Would you recomend to shorten blades???

I am interested of shorten a pair of thin and light 600mm to 525 for the Hurricane 550

Thanks

Per

[vicsalt]

Well Ive reset my likages so as the washout arm is level. I have worked througth the gyro setup video, and struggled but will repost my problems later.
I have put some power on the heli, not quite allowed it to leave the floor and these are my findings.
1. Im suprised how fast the blades rotate, its scary
2. the tail is moving / alteraning left and right.
3. I get what i can discribe as 'wobble', the rotor seems to wooble thus making the heli wobble. As the speed increases it isnt quite as bad i think.
I did bend the Spindle for main rotor (goes through the blade grips) I have ordered a replacement and straighten the original out which is whats currently in the heli (its not perfect but not bad) Could this be the cause of the wobble?
Every thing is tight and correct as far as I think.

In refferance to the Gyro I did struggle on the setup video, mechanical it correct with video, things moving in right direction. But electronic setup, radio and Gyro not so good. Im using Futaba 6EXH radio gear and really need simplistic help on what my settings should be on the Transmitter & Gyro.

Once again thanks for advice,

[vicsalt]

PS.
Bob, I wished you lived next door :)

[backman8571]

Vicsalt

One thing, what gyro are you using and what tail servo

Per

[vicsalt]

Ive added a short clip to give you guys an ideal of the tail / wobble movement i described in my previous post.
Thanks


http://s134.photobucket.com/albums/q84/vicsalt/?action=view&current=3dhx002.flv

PS the gyro is a http://www.sportsmoto.co.uk/acatalog/Gyros.html
Servos = http://www.sportsmoto.co.uk/acatalog/Servos_9G.html

[backman8571]

Thats a good gyro in quality between Futaba 240 & 401 only missing the digital switch.

I am using them with diffrent tail servos like the HS56 HS65 and HDX 9G digital servo.

Rock steady tail.

You have to trim the gain so it works, first set it up in rate mode and make it steady then after that power of the heli and back on but have the switch set to heading hold.

If you start trimming the gyro in heading hold the zero point will be out of wack so the gyro would pulse back and forward

After you have the rate trimmed corretly you be fine

Regards


Per

[vicsalt]

Sorry whats rate mode ? and trimming servo is this ajusting the travel extents ?
I have two ajustments on the gyro extents & delay the other is a rev switch.

Sorry, when you say trimming the gain you mean ajusting on the transmitter.