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06-06-2009 03:11 AM  9 years agoPost 21
Heli_KV

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Ottawa, Canada

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Different sound from the tail? And head speed more constant? Welcome to the club, Greg!

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06-06-2009 03:30 AM  9 years agoPost 22
Gregor99

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Western Wa

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Uh oh! I hope the belt isn't slipping. How can you tell? On my t500, when the belt slips you know it. Sounds like something is grinding. Its happened a couple times on badly timed autos where the tail touches down before the skids.

I'm not getting that kind of a sound on the HBK2. Its more of a raspy sound and the tail does not wiggle like its loosing power. At least that I've noticed. I did check the belt after the last flight and it still seems to be in good shape, all teeth there after 200+ flights.

Revolectrix Beta Team

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06-06-2009 04:52 AM  9 years agoPost 23
Heli_KV

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Ottawa, Canada

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Hope that's not the case in your case. But sounds very,very much familiar. New motor, better HS, seems fine... I have JGF400DH motor, which is considered more powerful than 3800 and I use governor and pinion is tuned not to max throttle, so head speed is perfect, so tail speed.

How can you tell? You asked me that question. My answer was - sound. Different sound. It is not grinding, it is different. 9T - not much for the belt to keep on. 4 teeth at best in contact with belt? Not much. Why did I start to talk of another boom?

Tail does not lose power...initially. Then it starts to be not much stable, but you will not notice, because you compensate automatically.
Then, you know what's then - it is all in other threads.
Hope I am not oracling (ops, new word! English is well morphing language, isn't it?).

I start to think that 12.000 RPM on tail is too much for HBK, extremely on tail load. But 10.000 is too low. Or artificially reduce HS on tail load - bog the head and fly accurately. I tried this with 33T/9T and Trex blades (stock blade sdid not hold) - you flip - you manage tail. New skill at least.

In my case, I hit a wall - I have choices - to reduce HS - 2600 maybe. Or to leave with splippage and change belt/pulley regularly.
You know - I started to be quite proificient at this.

Again - hope it is not your case. Please let me know.

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06-06-2009 05:48 AM  9 years agoPost 24
Gregor99

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Western Wa

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I'll keep an eye on that tail and report the results. How many flights are you getting before you start to notice lost or worn teeth on the pulley or belt? What's the first indication the parts are wearing out?

Revolectrix Beta Team

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06-06-2009 12:26 PM  9 years agoPost 25
MMike

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Holland,Mi-USA

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I've only "skimmed" this discussion but;

I have seen a HBK2 fly completely different after spraying in the boom.

There was even a build up of "rubber goo".

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06-06-2009 02:36 PM  9 years agoPost 26
Heli_KV

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Ottawa, Canada

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MMike, what do you mean by completely different after spraying? More tail authority? Different sound? Please clarify. Rubber goo is building, that's right. That's why I do not use step washers on tail anymore, but just washer of size of internal ring of ball bearing.

Greg, not much indication except sound. Unfortunately tail pulley is not seen and tail holds OK until it is too late - teeth gone. In my case, I still playing with different stuff, but I started to think about limiting tail rotor speed. Maybe something in 11.000 range. When belt slips, tail rotor head is reduced, but if tail still holds, that speed is enough.

In our case there are no much alternatives. We have only 33,39,43 front pulleys and 9,10,12 tail ones. HS is a parameter. On 2700 HBK still feels itself good in my case. Not that lite, but not that bad.

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06-06-2009 04:40 PM  9 years agoPost 27
MMike

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Holland,Mi-USA

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I sprayed my son's HBK2 with KEL. Pure silicone.

The heli was "laboring" and the tail was vibrating before this.

A little Tri-Flo was not enough.

After a thorough spray, it ran much better.

I presume the HBK2 is prone to this with it's small boom diameter.

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06-06-2009 09:44 PM  9 years agoPost 28
Gregor99

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Western Wa

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Did some flips today and the tail is doing a bit of wagging midway through. Makes for some sloppy looking flips. I always thought it was because the head was bogging and the tail was loosing thrust. It still could be that as there was weedwacker running in the lot next to where I was flying and I couldn't hear motor. Same issue when flying with the nitro guys. Darn noise polution

Anyway, I also did some punch outs (full collective). In idle-1 (85-95%) the tail moved a bit. But in idle 2 (95-100%) the tail and motor stuttered a little under full load. Could that be the belt slipping? Or perhaps a really old motor not coping with the load. I don't know. Checked the belt and pulley afterwards, and both still had all thier teeth. I'll keep an eye on both. Maybe drop down to 10t to see of that helps.

Revolectrix Beta Team

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06-07-2009 05:47 PM  9 years agoPost 29
Heli_KV

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Ottawa, Canada

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Greg, maybe in your case belt does not slip. Looks like I have greater chances of belt slipping, because I run governor and it does not max out (at least from what I see). So, when tail load increases and it increases, when tail blades change pitch, ESC in my case still maintains constant HS, thus constant tail speed, but load increased on tail, so more chances on slippage.

Now I keep 2700 governored.

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06-09-2009 07:23 PM  9 years agoPost 30
Heli Bob

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Puerto Rico,Carolina

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Like normal process radio on connect the bat and spull up and start o spin and stops and then like a 1/4 of stick if you leave it there for a little of time it start to turn the blades but if you go fast on the stick like going up to 1/2 stick it stops but the esc it get a Little hotter the usual i had the heli grab by the esc an the frame so i don't know.
I think i found the problem there are 2 screw on the bottom part of the motor the fan one missing.was not balancing good it was leaning to one side.

Beam E4(md-500e),Gaui 200,T-Rex 500,E-flight MCX.

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