HDX300 Build Videos wll be here

[Casey A. Sigmon]

hey yeah thank you. Well in all honesty I'm not sure what EXACTLY fixed it.
I tore the head down, the main gear,shaft, auto rotation sleave, tightened the belt ,
Set the radio and tail up according to your specs, Then i moved the tail grips as far out as possible along with changing the belt and tail blade direction. So im not sure. It works well though. now im on to struggling with the ailerons and elevator. The thing is balanced but im having trouble keeping it under control yesterday i was trying it out in my liviing room and it went foward hard and crashed into my x-cell 60! that killed the center hub so, now im working on the head. which alot of the problem could be that im using the stock blade cp head. Can't afford the v2 yet.
so i'll try and call you today around 4:00 Est. time. thanks. Casey

[johnnychimpo]

Anyone got video of the V2 head flying?

[venturebrowser]

Hey guys,
I've got a strange problem that I'm not sure of the solution. I've just built a HDX-300 running a DX6, futaba s3114 servos (including tail), GY401, AR6000 RX, eflight 20A ESC and Park370. My problem is when I use any cyclic or even the tail, I get weird pitch changes after each servo input (pitch up and down). Also the battery seems to be wearing down quickly. Would running a ParkBEC solve this problem. Am I asking too much of the ESC or is it something to do with the 3.3V from the RX (as read in one of the previous posts)?

Any advise would be great.

I've attached some pics of the new bird also.

[Funky]

Venture... I would try a different motor. I run that motor in my Blade and its not very powerful compared to some of the other available options for this size heli.... especially with a belt driven tail. My guess would be the motor is starting to bog with cyclic/tail input causing the heli to go up or down.

[venturebrowser]

Venture... I would try a different motor. I run that motor in my Blade and its not very powerful compared to some of the other available options for this size heli.... especially with a belt driven tail. My guess would be the motor is starting to bog with cyclic/tail input causing the heli to go up or down.

Thanks Funky, That seems like it would be the obvious solution, but I'm pretty sure that's not the case. I can't hear any sign of the head speed decreasing at all and the thing just drops from the sky...so it's got to be the pitch that's changing....just don't know why.

Thanks for the reply though.

[johnnychimpo]

I had to send my hdx300 motor back for a replacement. The motor was putting some serious vibrations all over and the heli was shaking its self to death. Do you think a 9t pinion on it was too much?

[ptremb]

venturebrowser,
If it was me,I would start by move some electronics around and change the placement of the antenna array first.You have your rx in the worst spot possible,between the motor and esc.I would put it between the frame and lg at the rear to get it away from all the noise.Even though you are using a spread spectrum rx, your still bound by the effects of emi/fri caused by the motor and esc.Also don't loop your servo wires and the motor wires together as this makes for great noise conduction thru wire induction.Try to run your servo wires on one frame and the motor wires on the other frame.Also you should end up with one antenna out the side and one out the rear or pointing to the front.

johnny.
I don't think that the 9t pinion is what did in your motor as that's the standard install

[dutch_anykey]

Hi,

By the looks you have a nameless 1300 mAh lipo from china. I had this one too.
It was cheap, but no good. Even my cp2 starts bogging on this lipo. It's just the C rate that isnt enough in my case. And yes is runs out of juice pretty fast....so that explains what you are saying about this lipo. But you don't hear the motor bogging down? ..that's a bit strange.

Maurice

[venturebrowser]

I had to send my hdx300 motor back for a replacement. The motor was putting some serious vibrations all over and the heli was shaking its self to death. Do you think a 9t pinion on it was too much?

Hey Johnny, I'm actually running the Park370 motor with 8t pinion and not the HDX kit motor. The motor shown no sign of bogging (until the laim battery starts to go) during the pitch changes. And the pitch actually goes UP and down at the same head speed.....not really a sign of a lagging motor. Thanks for the help.

[venturebrowser]

venturebrowser,
If it was me,I would start by move some electronics around and change the placement of the antenna array first.You have your rx in the worst spot possible,between the motor and esc.I would put it between the frame and lg at the rear to get it away from all the noise.Even though you are using a spread spectrum rx, your still bound by the effects of emi/fri caused by the motor and esc.Also don't loop your servo wires and the motor wires together as this makes for great noise conduction thru wire induction.Try to run your servo wires on one frame and the motor wires on the other frame.Also you should end up with one antenna out the side and one out the rear or pointing to the front.

johnny.
I don't think that the 9t pinion is what did in your motor as that's the standard install

ptremb,

You know, I haven't really considered that because of all the no glitch hipe of the Spektrum....but that is a good point. I will temporarily move my electronics around and try some test flights to see if that helps.

Thanks alot.

[venturebrowser]

Hi,

By the looks you have a nameless 1300 mAh lipo from china. I had this one too.
It was cheap, but no good. Even my cp2 starts bogging on this lipo. It's just the C rate that isnt enough in my case. And yes is runs out of juice pretty fast....so that explains what you are saying about this lipo. But you don't hear the motor bogging down? ..that's a bit strange.

Maurice

dutch, I think you're right about the battery. Although, these batteries performed extremely well in my brushless Blade. Now I'm dealing with a different creature that needs more juice, and I think I'll need to upgrade my batteries. Don't think it's the cause of my "pitch glitch" though....but it sure wouldn't hurt.

Thanks for the input.

[PeterV]

The battery could 'fade' and 'surge' under heavy (excessive?) load. So that could explain what was happening.

[johnnychimpo]

I had to send my hdx300 motor back for a replacement. The motor was putting some serious vibrations all over and the heli was shaking its self to death. Do you think a 9t pinion on it was too much?

Hey Johnny, I'm actually running the Park370 motor with 8t pinion and not the HDX kit motor. The motor shown no sign of bogging (until the laim battery starts to go) during the pitch changes. And the pitch actually goes UP and down at the same head speed.....not really a sign of a lagging motor. Thanks for the help.

WOW so your runnin a 3k headspeed with that setup.

[venturebrowser]

I had to send my hdx300 motor back for a replacement. The motor was putting some serious vibrations all over and the heli was shaking its self to death. Do you think a 9t pinion on it was too much?

Hey Johnny, I'm actually running the Park370 motor with 8t pinion and not the HDX kit motor. The motor shown no sign of bogging (until the laim battery starts to go) during the pitch changes. And the pitch actually goes UP and down at the same head speed.....not really a sign of a lagging motor. Thanks for the help.

WOW so your runnin a 3k headspeed with that setup.

Johnny, I've not been in the hobby long enough to really get into head speeds like I should. I experimented with my blade with a 10,9, and 8 tooth pinion....8t giving me the best overall performance with low motor temps and plenty of battery time. So I carried this over to my HDX. How do I calculate head spead? And on another subject....what is the significance of the C rating on a battery? Is C the coulomb value?

[johnnychimpo]

http://dhrc.rchomepage.com/calc.htm
http://www.readyheli.com/Online_Headspeed_Calculator_s/81.htm

Head speed calcs ^^

I am no battery expert but obviously the higher the C rating the more amps at discharge. I am using TP 1320 13C packs on this little heli 444grams BTW and it has plenty of power... when its actually flying that is. On bench now again waiting for parts!

[venturebrowser]

Sorry to hear about the bench time, but that's the hobby anyway, not the actual flying. If it were flying...there'd be no hobby. Thanks again for helping a newbie, all info is appreciated. Those calculators are great.

[vikas.sahota]

Hi Folks,

Thought Id stop to join in the discussions here, as I've been reading and learning from this forum for some time.
I started out about a month and a half ago with a HB CP2 which quickly went to brushless on the tail (feiageo) and then in a second rework to full seperates!
Quite a lot of screwdriver time vs flying time so far!
The HB CP2 eventually ran a 3200Kv Feiageo Inrunner for the main motor and Feiageo baby on the tail. Things worked pretty well with that setup until I decided to tear it down and go rebuilding around the HDX300 frame instead.

The HDX300 frame is all made up now, and I had a couple of test spin-ups. I had a big problem trying to get enough thrust to counter the rotor torque (as mentioned earlier in this thread).

I've got the new 40T pulley on order as my old one started slipping badly and the became difficult to get off the shaft w/out damaging it - guesse I should grind flats in the shaft as mentioned earlier in the thread to avoid that problem next time round.

Headspeed is the next thing to resolve, currently the 3200Kv 8T is not going to get too close to the target 2200-2300 so I have changed over to a 10T pinion for now (plus I have a 3800Kv / 9T and 4500Kv 8T awaiting delivery).

The throw of the tail assembly is particularly confusing though, like others have noted. I am using the SX tail assembly and it seems that there is definately a whole lot more left throw available than right, which doesnt make sense. You would want more pitch available at the right so as to counter the rotor torque.

The first thought was to just flip the belt and the blade direction. This worked in getting more torque but it didnt look to spin up stable at all.

Then I noted the main pulley slipping and so now im waiting for yet another delivery....

I guesse I would want the tail rotor rotating up and into the downwash from the main rotor really ?

I guesse this could be done by mounting the tail "upside down" on the left of the boom rather than the right, with the pushrod above the frame.

Have you guys got yours flying with the tail in the right place and spinning the right way? Once I have the right headspeed will it matter that I have very little throw at the tail to counter the rotor torque (or is it enough?)

Any hints would help!

[venturebrowser]

vikas.sahota,

I have learned from my mistakes already. I used the smaller white blades (V2) that Helidirect sells as they said they were better suited for the HDX300. This was not the case I couldn't get the tail to hold at all. I put the larger black blades that come with the CNC tail and all was solved. I also ground down the little bit of brass threads sticking out of the bearing housing to get that much more right throw. This seemed to help some also. Now, I've got a rock solid tail with very quick response. Now if I could just get my other problems fixed I would be in great shape.

Hope this helps.

[vikas.sahota]

vikas.sahota,

I have learned from my mistakes already. I used the smaller white blades (V2) that Helidirect sells as they said they were better suited for the HDX300. This was not the case I couldn't get the tail to hold at all. I put the larger black blades that come with the CNC tail and all was solved. I also ground down the little bit of brass threads sticking out of the bearing housing to get that much more right throw. This seemed to help some also. Now, I've got a rock solid tail with very quick response. Now if I could just get my other problems fixed I would be in great shape.

Hope this helps.

Hi venturebrowser,

Thanks those seem like good suggestions. The white tail blades - mines dont even hold tight in the tail without some extra washers to take up the gap. Was that the case for you also? I bought some spares so I actually have 3 sets of the white blades... doh!
The profile of the tail holder doesnt seem to fit the tail fins well either.

Maybe with enough headspeed and a 40T main puller I should be able to get the tail spinning fast enough not to need larger tail blades, and the white ones will suffice.
Anyone else get their HDX's running well with the small white "HDX300" tail blades ?

Grinding down the excess brass seems like a good idea I will give that a go next. Once the tail runs under the right headspeed, how much of the throw range is used in flight anyway?

Is there actually any inherent problem with running the tail in the reverse direction (reverse belt turn and the tail blades) ? I figured we'd want to cut up into the downwash really to get most torque at the tail. Any one else made that kind of setup work ?

Hopefully I can get this thing stable soon so I can go back to learning to fly soon!

[venturebrowser]

Yeah, I did have to use washers on the tail grips for the white blades, they were quite a bit thinner. I am also using a 40T pulley for the extra speed and running a head speed of close to 3K with a 8T pinion!! I'm not sure how everyone else is making the white blades work, maybe I did something wrong. I might try them again now that I got the bird flying right (as of last night). As far as reversing the tail, I'm not sure. I've heard of it done before, but I just went with the directions of Bob White (finless), and that seemed to work well.

Hope you get in the air soon

[vikas.sahota]

Ok glad its not just me having these problems then!

I ground down the excess brass from the tail and thats helped add to the throw, so at least the left/right difference is not so massive now.

The tail blade looks flat where the washer sits anyway so I dont think the washed will affect the angle of attack.

What motor are you using? I havent spun the HDX up yet with anything other than the Feiageo 3200Kv / 8T which I think was doing sub 2k rpm so no good. I've put a 10T on it but waiting for that pulley before I can try spin up again and try out the tacho I picked up a few weeks ago on it.

I guesse Im going to keep with the white blades for now and see if I have any luck.
Let me know how you get on if you try out the white blades again..

Id rather set up the tail the right way round like Bob's video for sure. I think I'll keep it the right way up and re-test with the higher headspeed once the latest shipment from helidirect has made it here.

[venturebrowser]

I'm using a Park370 4100kv with 8t pinion. I started with a 10T, which ran the motor hot and didn't mesh well with the main pinion. Tried a 9T and eventually settled on a 8T. Don't know if this is the "proper" set up, but it works good for me with plently of speed for the tail. I'll finally have everyting back together and flying properly (I hope) this weekend to do some actuall "flying" and not just hovering. I'll let you know when I R&D the tail some more.

[CT4]

Was going to buy one until I read all of the threads. I really want to find a micro that flys well, no 3d as I can only fly indoors. I have an Ark x400 but it isjust a bit too large. Any thoughts on the best type of micro would be appreciated.

[johnnychimpo]

The hdx300 spends most of its time on the bench waiting for parts.

Get a compy 300!
http://www.compy300.com/

[heliman420200]

this heli needs alot of tweaking to fly and it can probably never do 3d with that head, dont waste your money. there are better micros out there, im stuck with my hdx 300 i have invested close to 1000$ into this thing only to fly it 2 times, before parts started failing. i am now investing anather 300$ for a microheli head and tail and other miscelanious parts, :arggg: people that got it to fly in its current state will soon see the TRUE HDX 300 :twisted: :twisted: i got a jgf 400 motor in mine and 40tooth pulley, and since i put on this combo my tail rotor shaft has been shearing at 70% throttle and tail rotor flying across the room :WOW :WOW and
the V2 head is a absolute blunder! for more info check out the rcgr hdx thread.