RunRyder RC
 10  Topic Subscribe
WATCH
 2 pages [ <<    <    ( 1 )     2     NEXT    >> ] 3622 views POST REPLY
Helicopter
e-
Align
Other › Tail Explosion - MicroHeli, you disappoint me again
03-31-2005 06:25 PM  13 years agoPost 1
MFIS

rrVeteran

The Netherlands

My Posts: All  Forum  Topic

I wont buy another MicroHeli part. I just about lost an eye because of ANOTHER faulty part by them.

My tail exploded on spooling up. Investigation shows this to be the cause.

As seen in the pictures below, the tail rotor just broke. Flew apart. Im not running special headspeeds or an HV setup or a new fangled re-geared tail. Im just running a stock belt shaft with Microheli tail rotor and it just exploded sending pieces of tail rotor blades and the other half of the MH tail rotor assembly at my face.

Thanks guys. What crap Very disappointed.

PM  EMAIL  GALLERY  Attn:RR  Quote
03-31-2005 06:29 PM  13 years agoPost 2
PetSketch

rrApprentice

Stormville, NY

My Posts: All  Forum  Topic

Wow, Anni --- Will you be contacting MH about this? Sure looks like a faulty part to me! It could have been MUCH worse!

<>< Jim

PM  EMAIL  HOMEPAGE  Attn:RR  Quote
03-31-2005 06:37 PM  13 years agoPost 3
mini_zoom

rrNovice

Yorba Linda, CA USA

My Posts: All  Forum  Topic

That su*ks! For the price of that thing, it should have been made of Titanium.

Alvin

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
03-31-2005 06:53 PM  13 years agoPost 4
MrMel

rrProfessor

Gotland

My Posts: All  Forum  Topic

Yeah, there tail rotor head are way to soft almost broke my off mine by hand.


- Fredrik

PM  EMAIL  GALLERY  Attn:RR  Quote
03-31-2005 08:13 PM  13 years agoPost 5
JYRiker

rrApprentice

Maryland - USA

My Posts: All  Forum  Topic

It makes me wonder if these companies that are offering upgraded products are rushing their design/production just so they can hit the market while it's hot, without placing the highest concern on safety/quality???

Johnny

This is the second different issue I have seen with this product...

HeliUp Frame Trex 450
CF Trex 600
CF Trex 500

PM  EMAIL  GALLERY  Attn:RR  Quote
03-31-2005 08:21 PM  13 years agoPost 6
MFIS

rrVeteran

The Netherlands

My Posts: All  Forum  Topic

yeah emphasis on the safety part in this case. Picking shards of tail rotor from your chin is no fun...

PM  EMAIL  GALLERY  Attn:RR  Quote
03-31-2005 08:25 PM  13 years agoPost 7
dogon1013

rrNovice

Orlando, FL

My Posts: All  Forum  Topic

i read somewhere else that the design of these tail rotors is the problem. they take out all the slop in the blade holders and the blades can't feather correctly which puts alot of stress on the shaft that connects the blade holders as well as the screws that hold them in (it looks like that is what broke).

In this case less slop may not be good, unless you add dampening like the main blades have.

i think micro helli is just makeing these for the "bling" demand, not the performance demand. Maybe then they should have a warning like "not for flight use".

PM  EMAIL  Attn:RR  Quote
03-31-2005 08:30 PM  13 years agoPost 8
Gary Hoorn

rrKey Veteran

Annapolis Maryland USA

My Posts: All  Forum  Topic

Anni,
That is terrible! The guys standing around when I wound up the Heli to full RPM the first time thought it funny that I was wearing a Lexan Face Shield and a thick jacket. Can't be too careful. I have seen Heli/human accidents and they usually are not pretty!
Gary

PM  EMAIL  Attn:RR  Quote
03-31-2005 08:35 PM  13 years agoPost 9
Jarod

rrVeteran

USA

My Posts: All  Forum  Topic

Thats horrible that happened to you. At liest you didnt loose an eye or something like that. I hope you didnt get traumatized to much by this experience. Just hearing about it happening makes me think twice. These helis are small and cute but we may be getting to comfortable with them. They demand a bit of respect. We all spin them up in our hands and hover at eye level. I wonder who ends up being held responsible for injury do to an engineering flaw? When a building collapses people are held responsible. Is this so different?

PM  EMAIL  Attn:RR  Quote
03-31-2005 09:33 PM  13 years agoPost 10
Lowell Foo

rrApprentice

Vancouver, BC, Canada

My Posts: All  Forum  Topic

Has that tail rotor ever been crashed? I've had the exact same thing happen to an S&S tail rotor on my H2 after several crashes.

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
03-31-2005 09:48 PM  13 years agoPost 11
ChrisT88rrVeteran - FL - My Posts: All  Forum  Topic

I recently purchased all of the microheli upgrades, tail rotor, swash, washout and flybar system. More slop in the microheli washout then the original. Mine is extremely sloppy on the main shaft.

After mounting all the new upgrades during the test flight my boom came loose during hover causing me to hit throttle hold and "flop" to the ground (from about waist/chest high). Landed on the skids with no damaged other then the CNC flybar system pitch mixers/levers bent. The flybar, spindle, main shaft, blades and landing gear all fine yet the levers bent? cheap stuff.

To make things even worse, this happened when I tried removing the levers:


The head of the screw snapped off flush with the flybar carrier!

PM  EMAIL  GALLERY  Attn:RR  Quote
03-31-2005 09:51 PM  13 years agoPost 12
spritefiend

rrKey Veteran

Camarillo, CA

My Posts: All  Forum  Topic

wow this is shocking. Those parts look pretty quality. but that sounds like some pretty shoddy crap to be shredding on spool up, and just handling them. Bling wise looks pretty badass, but for inferior quality as a new micro pilot think im gonna stay away from this.

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
03-31-2005 10:30 PM  13 years agoPost 13
MFIS

rrVeteran

The Netherlands

My Posts: All  Forum  Topic

If you were holding a spinning helicopter in your hand i think you would have a hard time proving that you werent an idiot! even if the part was faulty and your injuries were paid for.
Of course I wasnt holding it in my hand. Where the hell did you read that in my post. I was spooling it up for flight on the ground about 6 feet away. A tail rotor spinning at 16000+ rpm will do some surprising things if it comes apart.

PM  EMAIL  GALLERY  Attn:RR  Quote
03-31-2005 10:31 PM  13 years agoPost 14
MFIS

rrVeteran

The Netherlands

My Posts: All  Forum  Topic

Has that tail rotor ever been crashed? I've had the exact same thing happen to an S&S tail rotor on my H2 after several crashes.
Of course not. I wouldnt be upset and cautioning the rest of you if it had. It was brand new.

And in addition to destroying itself it trashed the tail rotor shaft (bent from the extreme imbalance), the CF print TR blades, and the bearings look very sloppy now.

Ive had problems now with every MH piece i've ordered. Previously its been slop and binding issues or shoddy workmanship issues which affected my performance but now with this happening we are talking about my personal safety and the safety of anyone around me when im flying.

I think what someone mentioned above makes sense. I think either there is a serious issue with quality and workmanship or there just needs to be that bit of play in the TR head in order to keep stuff like this from happening.

Im running a Mega 3 turn by the way with 3 cells and a headspeed of about 2250. If the stock piece can handle this than the MH piece should be able to handle it as well or it shouldnt be on the market.

PM  EMAIL  GALLERY  Attn:RR  Quote
03-31-2005 11:50 PM  13 years agoPost 15
MicroHeli.com

rrApprentice

PIS

My Posts: All  Forum  Topic

Annihila,

We are very sorry for the problems you got and thank god you are safe. This tail rotor is a new design with longer and bigger bolts to go all the way to the center hub. The design is such the bolts can support the hub shoulder better so it cannot be broke during the flight. The design is an improvement over the first version and we have tested it very carefully. Looking at the pictures we cannot tell what the actual root cause is. Can you express the broken part to us so we can take a close look at where exactly it broke. We will refund or replace including your express shipping cost at your request once we receive the part. At the same time, we will halt the production to take sufficient time to make sure we find out the root cause of this problem. Until the problem is solved we will not produce any more of this due to its vulnerability to user safety. At initial examination of our production stock, it seems to be that it functions well without any sign of wearout or broken. The part might got into the situation that the twisting force is extremely large to break the shoulder of the hub. The root cause of the problem is uncertain until we receive the parts for more throughout testings.

Again, we are very sorry for the problem and will work our best toward the solution for this issue.

Andy Le

PM  EMAIL  Attn:RR  Quote
04-01-2005 12:24 AM  13 years agoPost 16
MFIS

rrVeteran

The Netherlands

My Posts: All  Forum  Topic

Andy,

While i understand your concern and need to analyze what has happened i dont feel its my responsibilty to put any more effort into this. Im not going to pre-pay for the shipping, make a trip to a fedex station to mail it back, box it up, and go through the general hassle of this so you can look into this problem which shouldnt have been a problem in the first place. Im sorry but im not investing any more of my time or energy into these products.

If you want to arrange a courier to pick it up from my home or office address i will be happy to do that but as i said im not going to take the initiative here. I dont feel i should have to. The money isnt the issue to me anymore.
This tail rotor is a new design with longer and bigger bolts to go all the way to the center hub. The design is such the bolts can support the hub shoulder better so it cannot be broke during the flight.
First you say that you dont know the root cause of the problem and then you mention that you have already put a new design into production to fix this very problem i had.

I can tell you the root cause of the problem. The bolts dont go far enough into the hub shoulder. The hub shoulder broke at the exact place where the bolt ends. The bolt could have been at least 2mm longer and i think this would not have happened. But apparently you already knew that and didnt inform those of us with the older models. Thanks for that.

Having your customers beta testing your products is not good business practice when you are charging them retail on the parts they are testing.

PM  EMAIL  GALLERY  Attn:RR  Quote
04-01-2005 12:39 AM  13 years agoPost 17
Crasher

rrApprentice

Gone on that

My Posts: All  Forum  Topic

First you say that you dont know the root cause of the problem and then you mention that you have already put a new design into production to fix this very problem i had.

I can tell you the root cause of the problem. The bolts dont go far enough into the hub shoulder. The hub shoulder broke at the exact place where the bolt ends. The bolt could have been at least 2mm longer and i think this would not have happened. But apparently you already knew that and didnt inform those of us with the older models. Thanks for that.

Having your customers beta testing your products is not good business practice when you are charging them retail on the parts they are testing

PM  EMAIL  Attn:RR  Quote
04-01-2005 12:53 AM  13 years agoPost 18
MicroHeli.com

rrApprentice

PIS

My Posts: All  Forum  Topic

Annihila,

As you got the old version, you know there was a problem with the washer, not the bolt itself. We haven't got into any problem through testing and any reports about the broken of the part due to the bolt is too short. We changed the bigger bolts so that it can hold the bearings well even without the washers with its bigger cap. While chosing new bolts we want to get the bolts longer to support the hub shoulder. With the longer and bigger bolts it should take some extreme force to break the shoulder.

We know you are upset at the situation and I would be the same if I were you. I wouldn't expect you to take initative to help solve this problem but if you could it would be very appreciated.

Again, we cannot conclude anything until we go back and re-examine the part. However, I would like to correct the message that we use customers as beta testing. Sometimes, any manufacture faces some problem with some certain technical issues that either new or unexpected. We have put our most effort into the design and testing to make sure the parts get highest quality before releasing to customers. Unfortunately some problem happens and we take very fast action to correct and remedy the problem. I hope you can see our effort. I am not sure why you get the problems with most of our parts but we have had thousands of very happy customers out there.

So I hope you can understand for the situation and give us some time while we are investing the problem and hope you can see our effort to make things right.

Andy Le

PM  EMAIL  Attn:RR  Quote
04-01-2005 12:57 AM  13 years agoPost 19
WRXRonald

rrKey Veteran

Auburn, OH

My Posts: All  Forum  Topic

well...
guess i just got lucky then....

i too have the MH tail rudder, along with all there other parts...

i haven't been able to use it after the other day, which i finally received my brass washers to replace the bunk alum ones that weren't strong enough....

so i did the replacement, and found some slop / wiggle between the blade grip and the main hub... did not know why, turned out my screw was not all the way down into the hub due to a buildup of R48, left my washer loose against the blade grip bearing, thus the wobble/slop and tail wag........

so i set at fixing the prob, got one blade grip off no probs and fixed by cleaning the screw...

then on to the next tail grip... well the buck stops there, cuz the little m1 screws (hardened steel i believe) are so damn tiny and such crap that the allen tip got stripped as i tried to unscrew the screw.... of course i had them R48'd to avoid and 'exploding' tail parts while in flight, but c'mon folks, R48 does not hold so strong that a screw tip 'allen' should strip when i turn the wrench to get it out... but of course it did strip, naturally this can happen pretty easiliy when your design uses a screw so tiny that is requires an allen wrench size of .050......... its the smallest allen wrench tip i've every seen and had to go to two different store before i found one with the correct size small enough of .050 just to work on the tail rudder kit. so now its stripped, and my 3 hours of efforts and every idea i could come up with would not back this screw out... i was stuck with a wobbly tail grip because the screw would not budge. so then i breakdown and decide fine you little bitch of a screw, now i'm getting serious, i will drill you out, and replace you with another M1 screw that will undoubtly not be sold in any stores that are anywhere near my home. take titanium-carbide drill bits to this stupid screw, (or whatever these bits are called, the were supposed to be for drilling into hard ****, and were expensive)... but all my drilling efforts will not budge on this screw, i cann't drill it out, i can hardly remove any material from this screw, and the bit i'm using must be tiny, therefore i cannot apply too much force or i will surely snap the drill bit.

i now have a completely worthless $65 MH precision, (no longer precise) tail rudder.

swapped back to the stock rudder now. bummed out again. i don't know why they used such small allen head screws, they are too weak, and strip much too easily. i too, have now had problems with every single MH part i've purchased except for the main shaft Ti, feathering shaft Ti.

guess god was watching out for me, since he grounded my heli with use of the MH tail rudder, (he probably knew it was going to explode on my like Annihila's did) and i was lucky enough to be spared due to other reasons. (and to think i was mad that i could no longer use my tail rudder)... it wouldn't have mattered if it was still working fine, because today i would have read this post and had no choice but to ground my bird and re-install the stock tail rudder.

Andy,

appears MH is admitting the original precision tail rudder has some issues that the screws do descend all the way into the hub, so i would expect then MH will be replacing ALL of the former purchasers of precision tail rudders with the NEW design tail rudders? that would be the right thing to do in my opinion. i understand that could be costly for MH, but honestly, these are the costs of rushing a good thing, and making mistakes along the way. this bird should not be getting more dangerous the more money we put into it, should it?

PM  EMAIL  GALLERY  Attn:RR  Quote
04-01-2005 01:14 AM  13 years agoPost 20
ChrisT88

rrVeteran

FL

My Posts: All  Forum  Topic

Heres a shot of the bent pitch mixer/lever. This is from a hard landing!!!! I've been flying for 5 years and have never seen anything so weak.



This IS a problem....

PM  EMAIL  GALLERY  Attn:RR  Quote
WATCH
 2 pages [ <<    <    ( 1 )     2     NEXT    >> ] 3622 views POST REPLY
Helicopter
e-
Align
Other › Tail Explosion - MicroHeli, you disappoint me again
 Print TOPIC  Make Suggestion 

 10  Topic Subscribe

Monday, April 23 - 4:02 pm - Copyright © 2000-2018 RunRyder   EMAILEnable Cookies

Login Here
 New Subscriptions 
 Buddies Online