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Old Dec 21, 2011, 01:47 PM
Sir Crashalot
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Lee,

Would you upload a video showing how you track and tune the blades? Mine seems way off out of the box, the heli has significant vibration when I hold it with motor running. Still flies, but I'm sure it can be improved. Thanks.
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Old Dec 22, 2011, 04:53 AM
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Zurich
Joined Apr 2006
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Originally Posted by stonecutter View Post
Lee,

Would you upload a video showing how you track and tune the blades? Mine seems way off out of the box, the heli has significant vibration when I hold it with motor running. Still flies, but I'm sure it can be improved. Thanks.
Unfortunately, I have no camera nor way to upload in the moment. AND, every situation will be different, so the principles involved are most important.

If you "Search" through my various posts in this thread, you'll find MANY tips and clear explanations! Start with the latest posts [re: tracking tuning].

The main goal is to have the leading edges of each spinning rotor disc appear so tightly together that they merge into ONE razor-sharp [appearing] white leading edge! The tips I've posted show how, and depend on lots of careful patience.

Also read about proper lubing, blade balancing and gear adjustment!

Good Luck,
Lee
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Old Dec 22, 2011, 05:04 AM
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Originally Posted by jfranklyn View Post
Hello,
I bought 2 GT 5888's from ebay. Both of them worked out of the box. I had to adjust the trim controls to get them to fly straight, but that was it. I fly them indoors and out. This is the first small heli I've owned and I'm impressed with everything except the battery life (7-10 minutes).

One of the small rotor gears came off and I had to press it back on to the shaft. The other small gear recently stripped. I think I over-revved it while the rotor's were blocked. I would suggest getting a couple of sets of blades and at least one spare motor.
Are you SURE the pinion is stripped .... or did that gear just come loose on the motor shaft?

In my extensive experience w/5888s, I have never seen pinion stripped, but often, many times, a loose pinion!

This is due to low-cost "QC" for the radii of both the cheap motors' shafts and the pinion-bores.

Simply remove the pinion, use a micro amount of CA gel [NEVER use liquid CA on these helis!; epoxy is a good second choice] on the shaft, then quickly insert and position the pinion.

[NOTE: the optimal position is usually with one edge of the pinion flush w/ main gear edge, not in the center of the pinion! > test by holding heli inverted to force rotor-shaft "up" into flying position, and hand turn rotor slowly in reverse!!]




Lee
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Old Dec 22, 2011, 10:51 AM
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Joined Dec 2011
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U.S. source for 5888 parts

Hello all,
Anyone know of a North America source for 5888 parts? I have 2 5888's. I've been ordering parts from golden hobby. They have good service and prices, but its a pain waiting 2-3 weeks to get parts.

Thanks
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Old Dec 28, 2011, 06:24 AM
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Zurich
Joined Apr 2006
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tuning tip

While adjusting blades today I was reminded of the following:

1. The (mechanical/electrical/aeroelastic)* optimal blade "tip-play"/looseness of the alu blade-holder/hub-hinges of >

4mm upper rotor
3mm lower rotor


which allows the fwd-swept blades to twist their pitches under flt-load such that [w/NEUTRAL yaw!] the lower rotor disc appears ca. 10% thicker [more pitch, as needed in accelerated lower airflow!] when viewed edge-on .... is based on the assumption that the upper & lower blades have the same thickness (and thus equal torsional resistance!).


2. One can check thickness/torsion-resistance by flexing each blade downward at its tip-rear.


3. In case the lower blades are (torsionally) stiffer than the upper, the tip-play and/or the actual pitch of the alu plates must be adjusted to compensate, to allow the lower rotor to assume ca. 10% greater pitch than the upper, under power in hand, yaw-neutral trim! [Luckily I could merely install equally stiff upper & lower blades].

4. NOT doing the above, even with perfect tracking, will reduce flt. times, effective power & performance .... and motor life ... by as much as 30 - 40% !!


Lee


*I have repeatedly checked this "concept" with a strobe > both rotors revealed to be spinning with the same speed/RPM when lower rotor disc ca. 10% "thicker" [more pitch].
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Old Dec 29, 2011, 02:25 PM
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Blue Bell, PA
Joined Aug 2002
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5888 pinion gears

Anyone know a source for motor pinion gears for 5888 heli?

I lost a pinion, can't find it

Where can I get some new pinion gears?

Are both upper and lower pinions the same?

Tnx
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Old Dec 30, 2011, 07:22 AM
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Originally Posted by cozmicray View Post
Anyone know a source for motor pinion gears for 5888 heli?

I lost a pinion, can't find it

Where can I get some new pinion gears?

Are both upper and lower pinions the same?

Tnx
Some of the newer pinions are long enough to be cut in half [but main gear must be made perpendicular to shaft]. Rt & left pinions are the same.

Pinions come with new motors ....

note: loose pinions can be adhered with CA gel


L
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Old Jan 05, 2012, 04:02 PM
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Joined Jan 2012
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Alu hub screw holes

Hi Lee, or anyone caring to answer.

I have been really enjoying my 5888 and have also used your tips for tracking and tuning. But what's happened to me twice now is that I overtighten the screws on the blade hubs, and then they become loose. I now know, that the tightening needs to be done by 'micro-bending' the alu hubs, and not tightening the screws.

However, that is now too late, and I have another loose screw (already replaced the alu hubs once, pain in the ass). Do you have any tips to fix this? Apart from ordering another set. I was thinking of adding a tiny bolt to the screw, but I'm not sure those are made in that size.

Hope to hear from you.
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Old Jan 05, 2012, 10:54 PM
Sir Crashalot
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saratis, I'm sure Lee would have a better solution for this, but I've put a tiny drop of super glue on top of the loose screw on mine, it is still holding up after several weeks. Of course you do this only when you have the blades tuned to your satisfaction and don't plan to tinker with it often.
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Old Jan 06, 2012, 08:39 AM
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Zurich
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got a screw loose?

ahem .....

[anyway, they are actually bolts, not screws, in this case]


I do three things, in this order >

1. Remove the blade, being SURE* not to lose the essential tiny brass bushing!
Then I put a micro-drop of CA gel [NEVER use liquid CA!!!!] in the hole with a round toothpick and heat-cure it quickly with a hairdrier, avoiding heating the rest of the heli so much as possible.

2. Reinsert the blade and screw in the bolt to give the desired "tip-play" looseness. [b.t.w., within limits, the looseness IS adjustable with BOTH of the bolts, the inner one for fine-adjustment: just be careful not to strip the alu plate's threads]. Run up the heli in your hand and check for tracking, readjusting the bolt ....

3. THEN invert the heli and put a glob of CA gel around the exposed lower end of the bolt. Allow an hour to solidly cure.


Once I've tracked & adjusted the blades, I put a glob of CA gel on ALL the exposed bolt-ends: this not only holds the adjustment, but keeps the bolts from stripping the alu plate threads!



L



*[note: I remove each bushing and use a toothpick to put a micro-drop of CA GEL in the blade hole, remove most of the CA with the toothpick, cure it, then re-insert the bushing with another round toothpick until it is loose enough to come out ONLY with force> it needs to be able to move very slightly in the alu hinge to self-adjust its position]
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Old Jan 07, 2012, 03:16 AM
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Thanks so much for your advice guys! Great.

Lee, when you say hole, you mean the hole in alu right? Were I messed up te thread. So the glue will be the base for a 'new' thread. Do I understand this correctly?
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Old Jan 12, 2012, 06:27 AM
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Originally Posted by saratis View Post
Thanks so much for your advice guys! Great.

Lee, when you say hole, you mean the hole in alu right? Where I messed up the thread. So the glue will be the base for a 'new' thread. Do I understand this correctly?
Yes [note: use CA gel, not "glue"].

After the bolt is functioning and rotatable, ADJUST blade for perfect tracking, then SEAL with more CA gel > add a blob around exposed bolt end and allow several hours to get rock-hard.

Lee
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Old Jan 12, 2012, 07:19 AM
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Zurich
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notes from a 5888 mechanic/repair-person

I got a used 5888 from Marcel that supposedly only needed a new LIPO, which I bought plus 2 new motors, all for Sfr/USD$22, total. Marcel imports lots of R/C helis & planes so he can keep some for himself because he is an avid R/C hobbyist. When he told me that this used heli, which he said was one I "set up" for him, flew great and to only change the LIPO, I believed him.

But, as a practical person, I checked it out at home and found:

1. There was a LONG thin wire strand caught in the swashplate ["bearing" in 5888 parts list].

2. The left motor was a replacement white-topped one [that is GOOD, and the only reason I bought the heli!], that he had installed by running the wires outside the heli and twist-connecting the wires from the PCB. He had obviously done this before, and the wire strand must have come from an earlier such attempt, in which the swashplate ate the loose wire and took the strand from it.

3. The right motor did not turn at all! I tried another motor, rechecking all connections. Maybe the screwed-up swashplate caused something to overheat and kill a part in the PCB. Or maybe not. [NOTE: when I first take off the cabin from a new heli I use blobs of CA gel on all the motor and LED wires where they are soldered to the PCB. It is exremely difficult to re-solder those PCB connections without ruining something heat-sensitive!! So the CA gel secures those joints! THEN, when replacing a motor, I leave one end of the motor wire attached to the PCB and cut that wire long enough to allow a safe solder-joint away from the body, thread the new motor wires as first installed through the body at the factory, solder the wires and put some CA gel around the joint for insulation AND mechanical strength, then stuff back inside the cabin space. The slight extra length of wire barely diminishes performance and is a SAFE repair.]

4. The left motor did rotate the lower rotor, showing it to be BADLY untracked! My point is that even an experienced heli pilot was unaware of this, or at least did not notice it. Trust me: perfect razor-sharp tracking adds more performance that you might believe [all of mine now fly TWO TIMES faster and better than what was shown in my "birthday party" YouTube video, since I learned how to really track & tune these 5888s!!]

5. So the HELI was "trash" but i used the motors, LIPO and fast servos in an otherwise "dead" old one of mine. In so doing, I discovered >

6. The main gears can vary in diameter by so much as 1mm! And the motor pinions also vary. I had to try 3 different main lower gears and 8 different pinions untill I found a combination that was able to rotate smoothly with almost no resistance [heli inverted, rotor hand-rotated in reverse], not tight, but not, as TOO many are, so loose that the gears slip and click periodically, causing no-end of resistance, and mistaken by most users as a stripped gear [they are NOT stripped, just too far apart/loose!]

7. After 5 days and 10 hrs total work trying different blades [proper differential of upper vs lower rotor blade softness so that the heli would not turn left when adding power], tracking and lowering coning angles to reduce the sensitivity of the HOT servos' input, but still stable enough for comfort] .... I have a GREAT "new" heli!



Lee
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Old Jan 13, 2012, 01:56 AM
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Joined Jan 2012
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Hi all,

I just bought a 5888 heli but it wont connect/bind with the remote, it just stands there blinking it's lights at me. :P

I tried the re-bind by having the heli on and then pressing the right stick on the remote while turning it on. The remote flashes and beeps for a few seconds before showing a steady red light, just as it should. But still no connection with the heli.

Anything else I can try or is is just to consider it broken and return it for a new one?

Thanks
jAW
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Old Jan 13, 2012, 09:45 AM
Power-line attraction pilot
United States, MA, Natick
Joined Jun 2011
517 Posts
I have a 5888 and 5889. I am trying to fly both off of my turnigy 9x (flashed with er9x). I have been able to bind them but the 5888 is not very stable, and the 5889 just spins its tail rotor full blast anytime i touch the throttle. any tips?
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