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HomeAircraftHelicopterBeginners Corner › First Build HK-450GT need help
08-11-2010 03:46 AM  8 years agoPost 61
scoobiemario

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Newport News, VA

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True about skids. They were all over the place, until I grabbed drill and 1/32 drill bit, made holes in skids, and secured skids to plastic landing gear with little screws. They are always in same position now!

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08-11-2010 06:19 AM  8 years agoPost 62
Yeehaanow

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Vermont

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Hey, you're having all the same problems as I did. It's frustrating, I know it all too well.
My tail shaft and hub were both not straight from the factory. Combine that with loose bearings and presto, vibration. I think the only way to cure it is to change out all those parts. Might as well do the entire tail while your at it...and the list goes on from there.
I've come to the point where it's just not worth the time and money for these low quality HK stuff and a nice BNF align 450 in the classifieds looks real tempting.

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08-11-2010 03:30 PM  8 years agoPost 63
Kdog35

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Lancaster, CA

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Yes, I know!, I went back and read some previous posts and said "damn" he wasn't lyin', lol.

Checked out new Align tail assembies, over $60 dallas! ..I will take the tail apart eventually, I don't see any real vibration coming from the tail. Like I said the headspeed sure seems high, I put in a 13T pinion (HK gave me two 13T and not the 11T I wanted), I think I'll bring the throttle curve down too and try that.

Scoobie, good idea on the skids, I'll try that.

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08-11-2010 04:03 PM  8 years agoPost 64
Yeehaanow

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Vermont

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You might want to take everything off the tail and see if the shaft is actually straight. mine wasn't.
It would probably work much better if you changed the shaft and hub, then even better with new bearings. You could get all that for about $25.

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08-11-2010 11:52 PM  8 years agoPost 65
scoobiemario

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Newport News, VA

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If you are going to spend 60 bucks on align tail, I would add extra 20 and convert it to shaft driven tail.
http://www.readyheli.com/HS1298-Tor...41_p_34108.html

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08-12-2010 12:29 AM  8 years agoPost 66
postalflyer

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Gainesville, Florida

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There are even more issues he hasn't seen yet. I own 3 hk helis and they all have things to fix. Your gyro needs to be openned up and put a piece of 3m tape under the board as it bounces in there, also the wires should be coated with some glue as some have reported them coming loose. Your tailboom might be spinning around some, specially if carbon fiber ad it is thinner and needs some glue to build it up. I went with a torque tube kit on my 500 and fixed a lot of issues. Your rate setting might be too close to 50 and giving you problems. I would do maybe a 35 and on HH take it down some. A good thing to do is fold the tail blades and pinch them, then adjust ball link( laughingstill) showed me that. Careful with the head as ball links and rods are weak and should ne replaced. I was on a budget like you and learned a lot from taking it apart over and over. Replace the head as soon as you can with an align one. On some of the smaller hk motors the bolts are not a flat head and do back out, easy fix at LHS and don't think you should have glued yours. Pm me if you need more help, after 3 of those suckers the issues are easy to find

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08-12-2010 01:29 AM  8 years agoPost 67
Kdog35

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Lancaster, CA

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Thanks Flyer, ...yes, I'm having issues all right. I did fix the tail assembly and put in a screw in there and it's holding. I must not be threadlocking everything right because my pinion came loose on the motor, it's just been a big headache.

I also did the head set-up wrong. I put the recommended curves in BEFORE getting my 0 pitch, and not leaving the curves liniar. I also needed to shorten up the servo/swash link and mixing arms to "expand" the head more, then center for 0 pitch then go into the radio for swashmix adjust ...I'm tired I had to take the motor out the re-set the pinion, so I have glue drying again.

I have the hk-401b gyro, I need open it and place tape, ok, I'll do that. The tail is still not stable (at all). And, drop my rate and HH, thanks

Seems like my headspeed is wayy too high. I lowered it to 0/20/40/60/90 (haven't tried that yet), I have a 13T pinion and when I get to 50% throttle, it's like the helies ready to explode.

I'm praying my latest try on the head assembly will be much better.

My head hurts, I'm done for the day...

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08-12-2010 05:53 AM  8 years agoPost 68
postalflyer

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Gainesville, Florida

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Remember when you redo the head to put throttle hold on or unplug motor. Center stick and then install your horns at 90 degrees. Bearings work ok if you don't have a leveler. All this headaches in my opinion are worth it for your first heli as knowledge is gained faster. Another thing that can cause a wobble is simply the belt is not tight enogh. Good luck and keep me posted.

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08-13-2010 05:31 AM  8 years agoPost 69
Kdog35

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Lancaster, CA

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Well today I found out that I bought the wrong ESC, HK-40A. I read the horrible reviews on it at the Hobbyking site and it notes not to use 3C lipos, and it's not for a brushless motor. That's what's probably giving me such a hard time with my throttle. ok, I guess I need a brushless 40A ESC

edit: a friend wants to give me a mag 8 30A ESC, will that work with my turnigy 2830 3500kv motor?

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09-11-2010 03:21 AM  7 years agoPost 70
scoobiemario

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Newport News, VA

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Hey KDog!
how is your heli doing?
Any updates?
I'm about to post picture in here if you don't mind

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09-11-2010 03:58 PM  7 years agoPost 71
scoobiemario

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Newport News, VA

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I went flying yesterday, and when on second battery, heli became little loose, and at some point made weird noise, and started to vibrate a lot.
That's what happened:

Way to go Hobby King
Good thing I did not crash, landed safely.
Tail shaft bent itself from unbalanced force of one blade and blade grip spinning so fast.

Anyways, heli is on bench now... No flying for few days.
Good thing TRex 500 is on the way here

How's your heli doing Kdog?
By the way, make sure you'll protect all wires from rubbing against edges of frame. Frame WILL cut trough wire insulation, and may cause short!

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09-11-2010 04:40 PM  7 years agoPost 72
Kdog35

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Lancaster, CA

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Hi Scobbie, Things are much better, but after all this time, I'm waiting on one last part and that's a a 12T pinion to replace the 13T.

After going by the Finless videos and what everyone was saying on head setup, I couldn't get my heli off the gound at 0 pitch at center stick in normal mode. So now I have my pitch at +5 at center stick and I can actually fly now.

BUT, I ordered the wrong ESC in the beginning; a 40a ESC for 2c and wasn't for brushless. The heli acted real screwy and could never get anything adjusted.

I finally got a Volcano series 40a brushless ESC and did a mod I found for my gyro (secured the board and wires). I also oiled the bearing in the head and used threadlock (blue), btw, that blue threadlock doesn't seems to hold at all. I need to do what Yeehaw said and check the tail assembly and oil those bearings, I'm just not exactly sure how to disasseble. Anyways, I finally have a much smoother heli.

Once I get the 12T in, I think I'll finally be done; I have a little drift, but I can fix that. - then, ...crash time

Sorry about your heli, from what I'm learning, we'll have to do pre-flight inspections everytime we fly with these HKs. The way I look at it now, they are cheap helis and will be good to learn on. I thought of saving and doing the upgrades with all Align parts, but I won't. I'll just buy a used SE from someone here locally, that's later.

I have to say, I would have had a lot less frustration if I had some hex driver tools. I've been using the little allen hex keys all along.

I also wanted to say thanks to everyone for all the help I'm not completely set up yet, but she does fly. The next thing I want to get is a carrying case.

I'm now a proud "noobie" 450 clone owner heli pilot

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09-11-2010 05:09 PM  7 years agoPost 73
Yeehaanow

rrApprentice

Vermont

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I installed a new tail shaft, bearings, center hub, and pitch slider with linkages and it is silky smooth and runs true now. All for under $20 or so.
I had to file the base of the grips a bit, as they were rubbing on the hub. (This is where the hk is 99% compatable w/ align, I found!)

Scoobie- Did the bolt holding on the blade grip break? I think I'm still using the HK bolts... hmm.

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09-11-2010 07:34 PM  7 years agoPost 74
Kdog35

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Lancaster, CA

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YeeHaww, I looked on helidirect, helihobby and was looking for the parts you mentioned, do you have a link and part des./#s so I know what to get, thanks.

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09-11-2010 08:10 PM  7 years agoPost 75
Yeehaanow

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Vermont

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09-11-2010 09:50 PM  7 years agoPost 76
scoobiemario

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Newport News, VA

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Yup, that's same parts I've ordered and little bit more My one way bearing is sticking, so I will install Align one. Ready heli has cheap and very fast shipping. Totally recommend!

Yeehaanow; Yes bolt broke! That sucks!! I think part of problem was vibrations that I was having recently, but that bolt had to be poor quality. I could not find part that flew away, I did not even see it flying away!!

HK is good heli to learn for sure, not as expensive as Align, so you don't have to stress so much.
My learning process is:
- Phoenix
- try doing same on mSR
- than try it on HK 450
It works pretty well.

Kdog; I was thinking about buying anbother 450 too, TRex this time. But after flying TRex500 on Phoenix, that is more stable, I bought one
$500 for BNF with good electronics and 3 batteries... Can't beat that!

I've got same ESC as you, and works perfect.

Speaking tools:
I've got this set, It's good quality, tips are hard and long, do not strip , and set comes in nice case.
http://www.xheli.com/exi8pcsrctok.html

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09-14-2010 03:04 AM  7 years agoPost 77
Kdog35

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Lancaster, CA

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thanks yeehaw, I'll order those. In the mean time, I finally took apart the tail and oiled the bearings, I noticed when putting it back together, if I tighened the allen screws too much, it wouldn't swivle on the shaft ...so I just tighened enough so it was smooth. I din't add threadlock, I'm I suppose too? I always feel I'm going to get the threadlock in with the bearings and mess everything up. Anyway, wow, what a difference when you ACTUALLY lub the bearings, vibration is gone! And I put in the new 12T pinion, so now, my heli is FINALLY finished!

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09-14-2010 03:22 AM  7 years agoPost 78
scoobiemario

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Newport News, VA

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Good job!! Let's see some pictures!! And maybe video I am going to get video of mine, when repaired Which bearings did u lube? Shaft bearings, or grip bearings?

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09-14-2010 03:35 AM  7 years agoPost 79
Kdog35

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Lancaster, CA

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The grip bearings, that's all. I did the head a while back and noticed a drop in vibration. Today when I put in the new 12T pinion, I spun it up in the room and noticed how loud and shakey the tail was, so I oiled those bearings and it's now very smooth. Only thing is the allen screws are not very tight, if I go too tight, the grips won't swivle.

I did post pics a while back, I could do a video, but I don't know how to load videos, ...what format do you use? MP4, WMA?

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09-14-2010 03:56 AM  7 years agoPost 80
scoobiemario

rrNovice

Newport News, VA

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I just upload video to youtube, and then post link here. That's easiest way for me.

I will rebuild my tail by weekend, so I'll lube all the bearings. I've got some more stuff to do on 450, last weekend tail boom supports vibrate themself loose. Carbon fibre rod came loose from metal ends.
I'll have to check everything for balance and make sure there's no vibration.

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