HobbyKing.com New Products Flash Sale
Reply
Thread Tools
Old Dec 29, 2012, 12:52 PM
Cranky old fart
Balr14's Avatar
Germantown, WI.
Joined Oct 2007
21,486 Posts
Tail booms on HK clones are made from aluminum foil. I found aluminum and CF tubing sold by the LHS works very well. Even fiberglass arrow shafts work nice on the bigger models.
Balr14 is offline Find More Posts by Balr14
Reply With Quote
Sign up now
to remove ads between posts
Old Dec 29, 2012, 01:46 PM
RTF (Ready to Fragment)
Steve_'s Avatar
United States, WI, Beloit
Joined Nov 2012
4,187 Posts
Just got done hovering around inside (not easy) and it worked
like a charm. Fresh belt too, so hopefully I won't have to work
on it for a little while, other than to check belt tension.
Steve_ is online now Find More Posts by Steve_
RCG Plus Member
Latest blog entry: Our Day at the Park
Reply With Quote
Old Dec 30, 2012, 07:16 PM
Registered User
Joined May 2011
438 Posts
If you replace the short screws in the tail rotor housing with longer ones, be sure to only replace the one that holds the plate, that holds the slider arm. I found out that if the screw is too long it will contact the belt.
mugen 1 is offline Find More Posts by mugen 1
Reply With Quote
Old Dec 31, 2012, 09:48 AM
AMA# 548800
jombo's Avatar
United States, CT, Trumbull
Joined Dec 2007
5,223 Posts
i use the esky HB boom , its a tiny bit thinner so i line the boom with the original tinfoil 250 boom so it stays nice and tight in the tail and the block section.
http://www.xheli.com/ek-002367.html
this is a lot stiffer and hardly adds extra weight to the tail side .
jombo is offline Find More Posts by jombo
Reply With Quote
Old Dec 31, 2012, 10:29 AM
RTF (Ready to Fragment)
Steve_'s Avatar
United States, WI, Beloit
Joined Nov 2012
4,187 Posts
Quote:
Originally Posted by jombo View Post
i use the esky HB boom , its a tiny bit thinner so i line the boom with the original tinfoil 250 boom so it stays nice and tight in the tail and the block section.
http://www.xheli.com/ek-002367.html
this is a lot stiffer and hardly adds extra weight to the tail side .
Look at the photo of the boom closer.

This is exactly what I have done, except only at the ends and servo mounts

The original boom was too damaged, from an accidental power-up in
idle-up mode, and I panicked like an idiot.
Steve_ is online now Find More Posts by Steve_
RCG Plus Member
Latest blog entry: Our Day at the Park
Reply With Quote
Old Jan 01, 2013, 06:41 AM
RTF (Ready to Fragment)
Steve_'s Avatar
United States, WI, Beloit
Joined Nov 2012
4,187 Posts
Here is my baby, hovering in a small room.
This is on a TX without adjustable rates.

I can't get over how stable this is, even with ground effect.
This is a tough bird, already surviving a funky chicken.
All it did was tear up the boom and belt.

If you have been debating buying one, here it is flying
with the most sensitive transmitter known to man, and a guy
with 1 month CP experience under his belt that can barely hover.

Imagine how much more stable it would be with adjustable rates,
and a pilot with a clue.
__________________________________________________ ____
[ UPDATE ] I did a hover 2 feet up (not in the video) and it was rock solid,
almost as stable as my 9116
__________________________________________________ ____

HK250GT Indoor Hover (1 min 53 sec)
Steve_ is online now Find More Posts by Steve_
RCG Plus Member
Last edited by Steve_; Jan 01, 2013 at 08:54 AM.
Reply With Quote
Old Jan 01, 2013, 07:39 AM
RTF (Ready to Fragment)
Steve_'s Avatar
United States, WI, Beloit
Joined Nov 2012
4,187 Posts
Just noticed some squeaking coming from somewhere, like
maybe there is a bearing going out somewhere.

I already oiled up the tail.

I really hope the motor isn't dying already.
Any idea on where to look? It only does it under power.

I guess I'll have to take the blades off so I can get closer.
Steve_ is online now Find More Posts by Steve_
RCG Plus Member
Latest blog entry: Our Day at the Park
Reply With Quote
Old Jan 01, 2013, 12:33 PM
Cranky old fart
Balr14's Avatar
Germantown, WI.
Joined Oct 2007
21,486 Posts
My first inclination would be to look at the tail assembly. The roller the belt rides on is always suspect on any clone. Next, I'd check the bearings on the mainshaft. The motor is last thing I'd suspect, SkyArtec makes some pretty good motors. I'd say that motor had about 10 hours of use before you got it. If it was going to fail, it probably would have done so already.
Balr14 is offline Find More Posts by Balr14
Reply With Quote
Old Jan 01, 2013, 01:22 PM
RTF (Ready to Fragment)
Steve_'s Avatar
United States, WI, Beloit
Joined Nov 2012
4,187 Posts
Awesome. Thanks for the help.

Yup, the motor feels solid, no slop at all. The electronics are
bulletproof. Even when I had the belt too tight, nothing got hot.
Thank you so much for such a great learning tool.

I don't want my pretty lady to fall down and get hurt again, and
need to address this before another date

Last week I smacked her around, and she almost left me.
I guess she figured making me rebuild her tail was enough
punishment. She is a very tolerant gal.
Steve_ is online now Find More Posts by Steve_
RCG Plus Member
Last edited by Steve_; Jan 01, 2013 at 01:30 PM.
Reply With Quote
Old Jan 01, 2013, 04:47 PM
AMA# 548800
jombo's Avatar
United States, CT, Trumbull
Joined Dec 2007
5,223 Posts
Quote:
Originally Posted by Steve_ View Post
Look at the photo of the boom closer.

This is exactly what I have done, except only at the ends and servo mounts

The original boom was too damaged, from an accidental power-up in
idle-up mode, and I panicked like an idiot.
Nice , thats what i did too. I used a plumbers pipe cutting tool to cut it to size. the best thing is that you can stretch them too . I used the gaiu 200 belt or the Dynam 250 razor belt . it uses a pully on the main gear so it stretches the tail length about an inch longer , it makes it fly a bit more stable in forward flight
jombo is offline Find More Posts by jombo
Reply With Quote
Old Jan 10, 2013, 02:27 AM
RTF (Ready to Fragment)
Steve_'s Avatar
United States, WI, Beloit
Joined Nov 2012
4,187 Posts
Are the Align belts better on a 250?

Had a good scare today. I was about 10 feet up, outside on blacktop
having a blast, and my belt snapped.

It probably only had 50 flights, but I nicked the tail flying inside and put
a flat spot on the belt. There were partial teeth left, and it flew smooth
after some test flights. Honestly, I forgot it was damaged.

Anyways, I heard it snap, instantly knew what it was, and didn't panic.
I gently eased off the collective to let it drift to the ground while spinning
savagely. It was spinning so fast, I was afraid the whole tail was going
to fly off.
It came down hard enough to bounce, and I had already cut the throttle
to zero the first time the skids touched, the bounce was probably an inch
and then it glued itself to the ground from the negative collective.

I picked it up expecting the worst, but to my amazement could not find
any damage.

Inside I gave it a full inspection, and installed a new Align belt, the first one
I have tried. All the others were HK and these:

http://www.ebay.com/itm/130377507304...84.m1439.l2649

I noticed right away that the edges of the belt were much sharper and cleaner
on the Align belt. It also was easier to install, and didn't want to twist in the
boom as much as the others. I used a small wire to pull it through, and it
popped over the drive wheel cleanly. I even got the direction right the first
time, since I wasn't fighting with it.

Before it even left the ground, I noticed how much more silent
it made the heli. All you hear now is blade, and a little bit of gear whine.

It's cold here and I had my hood and hat on, and had to take my hood off,
because I couldn't hear it, and I don't like not hearing my head speed.

The tail is more stable, but I think that is because I moved the ball link
to 4.5mm from center, like the Align manual advises. I had it in the
next hole over from that (around 5.5mm), and I since the physical
throw on the servo was so short, I lost resolution and made it too
sensitive at the same time.

In all, it's a tough call. The Align belts are dead silent, and easier to
install. They also cost over $5 each shipped, the EXI's are $2 each shipped.

I have this one because I bid $3 on an Align belt w/ free shipping on
eBay, and won it. Hopefully I can get more deals like that.

On a 450 or larger, I doubt there is any difference at all with belt brands.
But on these 250's it is very noticeable. I can hear the blades better, and
it seems smoother, and just gives a better experience overall.

Heading out for some more heart-thumping action
Steve_ is online now Find More Posts by Steve_
RCG Plus Member
Last edited by Steve_; Jan 10, 2013 at 02:57 AM.
Reply With Quote
Old Jan 10, 2013, 09:38 AM
Cranky old fart
Balr14's Avatar
Germantown, WI.
Joined Oct 2007
21,486 Posts
Nice save! I think you will find there's a considerable amount of variation in the quality of belts for larger helis, too! Particularly with regard to stretching and separating. Having a belt let go on a big heli usually has spectacular results. That rotor head has lots of torque with nothing to counteract it.

It's over 40 here today. I think I'll give my Quark a try at lunch time. I haven't flown it in at least 6 months.
Balr14 is offline Find More Posts by Balr14
Reply With Quote
Reply


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Sold Hk250gt Black_heart Aircraft - Electric - Helis (FS/W) 2 May 18, 2012 04:30 PM
For Sale HK250gt , Beastx, Satellite daveapplemotor Aircraft - Electric - Helis (FS/W) 7 May 09, 2012 05:26 PM
Sold HK250GT with upgrades newheliguy81 Aircraft - Electric - Helis (FS/W) 3 Mar 20, 2012 11:10 PM
Sold FS/FT HK250GT w/spares RobDog Aircraft - Electric - Helis (FS/W) 1 Mar 03, 2012 09:07 PM