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04-02-2009 09:58 PM  9 years agoPost 1
JetFire

rrKey Veteran

The Golden STATE

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This is my latest mis-fortune. Align metal fan hub failure. Below is a pic of what it looked like when I took the shroud apart. The strangest thing is... It was not making any kind of unusual noise. The only thing that clued me in was that it didn't want to fire and I got very little compression during several starting attempts. Now... I'm no small engine mechanic nor has this ever happened to me so I have no clue as to whats involved in salvaging what is left and that is why I'm asking for your inputs. I'm thinking most of the external parts like the carb. Luckily, I have a new Hyper ready to rock and roll.

Thanx in advance.


Trex700N Pro
DX8-2.4
Spartan/BL9088

-The ONLY way you fail is when you quit.-

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04-02-2009 10:08 PM  9 years agoPost 2
helicrack

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Indiana

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I'm no small engine guy either, but I would imagine a fan disentigrating while running would torch the bearings, shaft, and rod right? Maybe the piston, back plate, and head could be saved as well as the carb?

".........said the joker to the thief"

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04-02-2009 10:33 PM  9 years agoPost 3
smallplanes

rrElite Veteran

S.C. ,SSA

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There metal is not as good as the US metal that's probally why it failed, and they must have it milled to thin.


Spectra G 26cc
Jewel
Bat 27cc
Trex 700<br

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04-02-2009 10:35 PM  9 years agoPost 4
Eagle2bravo

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Out flying somewhere

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T-rex 600n super pro , Trex 450 se, Gaui 200, Trex 500, Blade cx, . "If ya plant corn, ya get c

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04-02-2009 10:44 PM  9 years agoPost 5
dave75d

rrKey Veteran

Jacksonville, FL

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did it shear the bolts off?

ten grand in helis and all i can do is hover

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04-02-2009 10:48 PM  9 years agoPost 6
Dood

rrProfessor

Wescanson

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I'm no small engine mechanic nor has this ever happened to me so I have no clue as to whats involved in salvaging what is left
Start by taking the engine apart to see whats OK.
If you've never taken apart an engine, this video will show how to pull the engine apart.

There is a Part 2 that shows how to reassemble it.

Watch at YouTube

  ▲
▲ ▲

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04-02-2009 10:49 PM  9 years agoPost 7
baddynergy

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sierra madre, ca- usa

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Unfortunatly this is not the first time this has happened. Do a search and , although not common, it has happened quite a few reported times. Its either the hub or the fan that comes apart. Just chalk it up to quality workmanship and materials..

**Unattended children will be givin a shot of espresso and a puppy**

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04-02-2009 10:56 PM  9 years agoPost 8
JetFire

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The Golden STATE

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Thanx dood. I'm currently away from my computer so I can't view the vid yet do to the limitations on my smartphone.

Actualy guys.. let me clarify that it was the alluminum fan HUB that failed. Literally snapped off at the two tabs ripping the remaing bolts off the fan itself. Now there is two elongated holes on the fan where the bolts use to be. It was a hard shot to take so I did my best on the pic.


Trex700N Pro
DX8-2.4
Spartan/BL9088

-The ONLY way you fail is when you quit.-

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04-02-2009 10:57 PM  9 years agoPost 9
JAGNZ

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Auckland, New Zealand

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I have had 2 hubs break their mounting Lugs so far...they are very fine lugs.


Jason Greenwood

www.3dheli.co.nz

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04-02-2009 11:41 PM  9 years agoPost 10
Jeff polisena

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westpalmbeachflorida usa

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Why is motor bad looks like hub is only thing damaged

I stole it ,flew it and gave it back ;)

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04-02-2009 11:49 PM  9 years agoPost 11
VooDooX

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San Francisco Bay Area CA, US (San Mateo)

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motors spin at like 22000 rpm... all the vibration toasts everything thats why the engine is bad

Velocity 50 "99.9999999999999% of an atom is empty space." also 01001000 01001001

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04-03-2009 12:01 AM  9 years agoPost 12
TaleGunner

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Deer Park WA

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Could it be that the screws came loose then the whole thing failed? or does it fail the the screws come out?

I haven't built or dealt with this fan so I was just wondering, I can see were the screws were in the photo.

CRASH! GLUE! REPEAT!
Spectra-G, Ion X-2

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04-03-2009 12:18 AM  9 years agoPost 13
JetFire

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The Golden STATE

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That's hard to tell. The tabs are still held in place by the screws but its no longer fixed to the hub (snapped off). .. so I'm guessing it was the tabs that broke first.


Trex700N Pro
DX8-2.4
Spartan/BL9088

-The ONLY way you fail is when you quit.-

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04-03-2009 12:28 AM  9 years agoPost 14
Jeff polisena

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westpalmbeachflorida usa

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VooDooX , I understand that this can hurt motor . Did you open and see if things are destroyed or just no compression ? you might need to change only ring and sleve and bearings .

I stole it ,flew it and gave it back ;)

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04-03-2009 12:38 AM  9 years agoPost 15
RappyTappy

rrProfessor

Traveling the USA

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Trex fans and hubs are meant to be lightweight, which is good for flight performance but bad news for vibration. If the fan either isn't in balance, or the hub is bent or anything, it will make a mess of things. I know becuase I bent my fan hub simply on a forced auto after a flameout low inverted. The fan hub is a definite weak point on the 600N imo. Adding a little weight to increase strength and durability is a better trade off imo.

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04-03-2009 01:44 AM  9 years agoPost 16
JetFire

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The Golden STATE

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I didn't have a chance to tear it down yet. It's currently my only heli for the time being so I figured the quickest way to get flying again is to slap another Hyper on with new hub and fan and put my old one on the side as a project later. I'm not even sure if its worth the hassle cause I know nothing about rebuilding an engine. I will have to do some homework first and look over some videos including what 'dood' has already provided. I also don't have the tools to pull off such a project so I don't see this happening anytime soon but most definately sometime in the near future.


Trex700N Pro
DX8-2.4
Spartan/BL9088

-The ONLY way you fail is when you quit.-

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04-03-2009 01:46 AM  9 years agoPost 17
JAGNZ

rrProfessor

Auckland, New Zealand

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I also don't have the tools to pull off such a project so I don't see this happening anytime soon but most definately sometime in the near future.
There are no special tools that are required and our engines are super simple to rebuild. Very few parts inside! Get with someone who has done it before - it's piss easy. You'll wonder what all the fuss was about honestly...

I have a step by step PDF on how to rebuild the Hyper if you want it. Just PM and I can email it to you...it has pics and everything.


Jason Greenwood

www.3dheli.co.nz

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04-03-2009 01:49 AM  9 years agoPost 18
JetFire

rrKey Veteran

The Golden STATE

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That's good to hear JAG.. thanx. I was bent out of shape because that's like $200 down the drain and only had 8 gallons through it. But now that you put it like that.. I feel much better.


Trex700N Pro
DX8-2.4
Spartan/BL9088

-The ONLY way you fail is when you quit.-

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04-03-2009 02:26 AM  9 years agoPost 19
JAGNZ

rrProfessor

Auckland, New Zealand

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I uploaded the PDF to my site for you. It's here:
http://3dheli.co.nz/content/wp-cont...x-h-rebuild.pdf
or go here:
http://3dheli.co.nz/content/?page_id=17
and click on it.


Jason Greenwood

www.3dheli.co.nz

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04-03-2009 02:51 AM  9 years agoPost 20
Sonic88

rrVeteran

Murfreesboro, TN

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Yea I just finished rebuilding my Hyper to replace the ring. Like other said, it is VERY easy. Just take your time and dont force anything. You may need to heat the crankcase is the over at 200 degrees F for about 15 minutes to get the bearings out. That is literally the hardest part. Dont do that until you have removed everything else though.

Unfortunately, if you have to replace the bearings, sleeve, piston, ring, and craskshaft you are getting very close to the cost of a brand new engine. So, if the damage is great, it may not be worth it to fix.

Procrastinators of the world unite ... tomorrow.
AMA #: 912822

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