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X5 Discussion and support of the Gaui X5


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Old 02-02-2012, 04:46 AM   #41 (permalink)
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Tower,

Good to hear - I have always had excellent service from Fung at F-H, glad he's sorting you out.

Cheers,
Mike
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Old 02-02-2012, 05:21 AM   #42 (permalink)
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Quote:
Originally Posted by Tower View Post
Interesting, pictures of parts like the feathering shaft on the website look different from the one I have. Just an early production run kit I suspect.
i'm suprised with the head issue as the X4 heads were out a far while before the X4 production kit. Mine was a joy to fit and i like how the washout arm screws effectively act as another security device by going into the mainshaft holes. Isn't the feathering shaft the same as the X5??? 6mm

Really sorry to hear your issues.

Just a tip with tight bearings as any tap on the non-retaining side will damage them. Throw the grip in an oven for a few minutes. The aluminium will expand slightly with the heat before the steel bearing and the bearing should fall out with a tap on the bench. The neg of heating it is that you will most likely burn the grease and will need new bearings anyways. Unless you have good solvent and are very meticulous.

Opposite on the way back in. Bearings in freezer, warm grip. Drop in.


I have a brand new set of X4 grips here that you can have. Were left over from a project and have no need for them.


Vas
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Old 02-02-2012, 05:16 PM   #43 (permalink)
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Default X4 Build

Quote:
Originally Posted by torana74 View Post
i'm suprised with the head issue as the X4 heads were out a far while before the X4 production kit. Mine was a joy to fit and i like how the washout arm screws effectively act as another security device by going into the mainshaft holes. Isn't the feathering shaft the same as the X5??? 6mm

Vas
Hey Vas
Are you actually a Gaui Rep? Fung tried to connect me with Nick at Gaui but he did not repond directly. I am curious if you know if Gaui is looking at things like the short screws in the head, head not fitting on main shaft, and canopy issue?

Many thanks for the offer! I think I am good as Fung has secured a complete new head which will address everything up top. I have attached photos of the feathering shaft I have and the same part shown on the FH site. Not the same. Mine has been machined or ground down at the ends? They are 6mm spindles. It is actually 5.94 MM along its length and flares at one end (the one that was severly stuck) to exactly 6mm which is why it still fits through the bearing. The head did not fit on the 8mm shaft, not even close. Something is clearly out of whack.

I have the glue drying now on a canopy modification which I think will work to stop it flopping around and hold it centered. I will post it shortly - I think its going to work well and looks pretty good. Hopefully the bugs will be worked out wih this kit before it hits the dealers here.

Cheers
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Old 02-02-2012, 08:08 PM   #44 (permalink)
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Default Gaui X4 Canopy Modification

Pictures worth a thousand words, a video must be worth a million

Cheers


Last edited by Tower; 02-03-2012 at 04:48 AM..
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Old 02-04-2012, 05:52 AM   #45 (permalink)
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Tower, i'm just a lowly field rep via the great folk at Empire Hobby but will pass on your concerns to Gaui.

Not sure about why your feathering shaft has the machined ends. Could be to make it easier to line up and get through those thin washers behind the thrust bearings

My use of the X4 head shown in this thread
https://www.helifreak.com/showthread.php?t=289867

+1 on the canopy mod. I really like how the magnet even help position it perfect to push on the canopy mounts. Well done


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Old 02-15-2012, 05:31 PM   #46 (permalink)
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Default X4 Build - Parts have arrived!

UPS dropped a package off this afternoon and the build is back underway. Thanks Fung!

The only part missing in the package was the feathering shaft - Doh. Anyway I have pressed the original back into service.

The new blade grips are different. The tolerances are better - the bearings can be removed easily. Everything came lubricated.

The new head block slides on to the main shaft like water on ice. Perfect fit. As you can see in the photo it looks like it has been drilled out and maybe even buffed up inside. My original was painted inside (see previous posts).

Everything went together in 20 minutes and I now have a FBL head on a shaft on a helicopter.

One note on the supplied ball links. They are a bit harder plastic then I am used to seeing. Two of them broke taking them off and putting them on using ball link pliers. Fortunately two spares were supplied and were pressed into service.

The AR7200BX has arrived and electronics install is next.
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Old 02-15-2012, 05:34 PM   #47 (permalink)
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Quote:
Originally Posted by torana74 View Post
Tower, i'm just a lowly field rep via the great folk at Empire Hobby but will pass on your concerns to Gaui.

Not sure about why your feathering shaft has the machined ends. Could be to make it easier to line up and get through those thin washers behind the thrust bearings

My use of the X4 head shown in this thread
https://www.helifreak.com/showthread.php?t=289867

+1 on the canopy mod. I really like how the magnet even help position it perfect to push on the canopy mounts. Well done


Vas

Thanks VAs
I am thinking of trying a canopy mod on the Trex 500 Pro now.... Hmmmm
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Old 02-15-2012, 08:47 PM   #48 (permalink)
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Gaui links are notorious for breaking. Use the quick uk from anything heli, I am sure Dave can get the right ones.
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Old 02-22-2012, 07:03 PM   #49 (permalink)
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Default Gaui X4 Build - Electronics

Wiring went well - I was able to hide most of the excess without trouble and the end result is fairly neat. The fuse is very narrow as you can see. There is not enough room to get a servo connector up between the boom and frame sides - very tight!

- Cyclic servos are running up over the top of the fuse and ducking in under the top bearing block.
- Elevator servo wire is a straight run up and over the back frame.
- Esc is on the outside of the fuse for cooling purposes. It could have fit inside but is not in the way where it is and is easily accessed. Wires to the motor loop forward and up. I am using two of the pre-drilled holes for the wire ties. The ESC to receiver wire required an extension.
- Rudder servo is coiled and a straight run to the receiver.

As you can see the AR7200bx is wider than the helicopter. I trimmed down the tape pad to fit between the frame sides.

The receiver/gyro tray is secured from below with some shoe goo - messy stuff but it can be removed later if I need to get it apart. The tray was loose as the receiver holes were oversized in the frame sides.

I have run up the motor at this point and ended up lubricating the gears - very noisey without it and I saw a build site in Asia where someone had done that.

The AR7200BX programming is underway
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Old 02-27-2012, 06:56 AM   #50 (permalink)
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Default Gaui X4 Build - Finished

The X4 took a build vacation half way through while awaiting parts to complete the head. Once in hand the build proceeded rapidly. Near the end I ran into some head scratching with the programming of the AR7200BX. I hope I have that right! These flybarless systems are pretty interesting although I wonder if the average Joe will be able to program them. I have an electronics background and they can be frustrating. Time will tell.

The X4 has an interesting look sitting on the bench. It is unusual, when compared to other helis I own, in that the tail is chunky and the body is very narrow (made possible by those small gears)

It is now sitting on the shelf awaiting a warm windless day for a test flight. Some overall impressions and observations;

1) The kit I have is obviously a first run version and has quite a few bugs to work out. I have documented the challenges throughout the build and forwarded them to GAUI and to Flying Hobbies. FH has been very helpful. I did not hear back from GAUI.

2) The C of G may be a challenge for this machine - there is a lot of tail meat to it and without a battery it sits like a tripod - hard on the tail. A 40c 2650 6S pack still requires 1 oz (50g) on the nose to balance the heli. A 3000 ma 20 C pack (500g) balances it perfectly, however is a tight fit even with the canopy mod.

3) This machine sounds like the head is turning at 3000 rpm as you start it up! The small gears are spinning fast and are noisy despite the lubrication I added earlier .

4) So far I have been unable to program the ESC - I suspect it is because the AR7200BX is in the way at start-up and will not allow the ESC to enter its programming menus - I have been trying to ensure the slow start is as slow as it goes - right now it starts very quickly (although the default is a very slow start). I will likely have to try another receiver to isolate the problem.

5) One final note - the blade holder appears to be off a much larger machine, it is enormous - the blades flop around in there like a fish on dry land .

The helicopters performance will be a reflection of the electronics I suspect more than the mechanics. The flybarless systems and their interaction with radio programming are becoming extremely complex. Everything can be adjusted in multiple ways with the AR7200BX and DX8. It will take a while to determine if this helicopter is a keeper.
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Old 02-27-2012, 07:11 AM   #51 (permalink)
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Default Gaui X4 vs Trex 500EFL PRO

Sitting on the bench the striking differences between the helicopters are the tail booms and mechanisms (the X4's dwarfs the 500EFL's). And the narrow ness of the X4 made possible by those small gears.

In terms of balance - the 500EFL will sit on the bench with the tail in the air. The X4 sits hard on the tail. The EFL is nose heavy with a 3000 ma 20c 500gram pack while the X4 sits perfectly flat. The 500 likes a 2650 ma 40 c (450 gram pack) while the X4 sits on here tail again with this size pack)

the 500EFL is heavier by 20 grams - a surprise! The differences is small though and changing receivers and servos would change the situation.

Time will tell regarding flying characteristics which I believe will be more a function of the electronics than mechanics.
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Old 02-27-2012, 08:16 AM   #52 (permalink)
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Have you managed to get past all of your troubles? I am considering putting and X4 in a scale body project I am working on, but your initial troubles have caused me concern.
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Old 02-27-2012, 02:29 PM   #53 (permalink)
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Default Problems resolved

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Have you managed to get past all of your troubles? I am considering putting and X4 in a scale body project I am working on, but your initial troubles have caused me concern.
Hi
Yes I have
If you read back through the build info here and on RC Canada you will see that a few required replacements parts from Gaui. The original blade grips and head were replaced. Also, the top 2 screws on the two front servos are wrong, too short. If you try to tighten them you can strip the holes in the top bearing block and may have to replace that if it happens.The feathering shaft that came with the kit is no where near regular production quality ( I would hope anyway)

The Gaui X4 complete ran me about 150 dollars more than the Trex 500EFL pro. This hobby is not based on logical financial decisions, or we wouldn't be in it in the first place. However, the extra costs, with the bugs still to be worked out, inside a scale fuselage that will hide the mechanics? You'd have to be as crazy as I am
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Old 02-27-2012, 03:33 PM   #54 (permalink)
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lol thanks for the update.
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Old 02-27-2012, 08:28 PM   #55 (permalink)
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I am deeply unimpressed given all the issues you faced, I almost picked one of these up but the (IMO) high price kept me away. I am really glad you posted all of this, saved me a headache. Most of all, I hope its a call out to Gaui to stay on top of QC and push for higher standards.
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Old 03-02-2012, 05:29 PM   #56 (permalink)
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Default Price hike

Interesting
The Gaui x4 has gone from 575 dollars to 699 for the same package I bought ( heli, motor,esc,and blades) on the flying hobby site? No FBL controller, receiver, or servos - the x4 is now a 1000 dollar ++ 500 size heli in the air ????
I will let mine go for an even 1000 to anyone willing to pay shipping
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Old 03-02-2012, 07:14 PM   #57 (permalink)
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I bet that is in response to the lack of supply on the x5.

X4 airframe still only 449 on anythingheli.com


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Old 03-02-2012, 07:42 PM   #58 (permalink)
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Default Price going up

Quote:
Originally Posted by cdsexton View Post
I bet that is in response to the lack of supply on the x5.

X4 airframe still only 449 on anythingheli.com


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I finally own a heli that is an investment!
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Old 03-17-2012, 04:23 PM   #59 (permalink)
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Default Flight Test - Gaui X4

Two flights on it today. Camerman was busy fixing his Heli during the maiden - couldn't wait.
Very nice - very stable. The 7200BX setup worked fine. No tail wag - stops on a dime no - kickback. Aileron and elevator feel good for a guy who hasn't flown much this winter

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Old 03-21-2012, 05:26 PM   #60 (permalink)
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Default Gaui X4 or Align 500EFL

I am late on this post, but I missed the conclusion. I like both models, but from the sound of it, the Align 500 is a better way to go. Am I correct or not? Thanks.
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