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Ark › Center hub AGAIN!!!! and a amazing save!!!
02-08-2006 03:22 AM  12 years agoPost 1
hghlndr85

rrApprentice

northeast, PA

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well i fixed my heli form least cener hub failure.(THANKS HELI-MAX)
got a new thunder power 2100 slapped it in and went out,mshe flew awesome!!!!! i finally conquered loops and rolls,stall turns!!!! i was quite happy until my last loop,when i was comin out of it the helis blades folded!!! like a v,i was like wtf!!!! luckily it wasnt far form me! i hit the trottle hold adn RAN to catch it as it was falling bc after my last $85 repair bill i wasnt doin it again! i managed to grab the tail of it and keep it from smashing into the ground! i looked at it to c wat happen and the damn center hub sanpped in the same place!!!! i couldnt believe it!, came home ordered the microheli head of modefos!!! im done losing lfight time with heli-maxes crappy plastic parts.

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02-08-2006 03:36 AM  12 years agoPost 2
Nugz

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N.J.

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sounds like a nice catch and yeah the center hub is a "must" on the upgrade list

MFD

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02-08-2006 03:36 AM  12 years agoPost 3
BoneDoc

rrApprentice

San Antonio, TX

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nice catch .

**If you ain't crashing, you ain't flying hard enough**

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02-08-2006 08:23 AM  12 years agoPost 4
hghlndr85

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northeast, PA

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anytihng else that is a "must"?

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02-08-2006 12:39 PM  12 years agoPost 5
BoneDoc

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San Antonio, TX

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That's the only "must" the other stuff will make it fly better though.

**If you ain't crashing, you ain't flying hard enough**

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02-08-2006 06:07 PM  12 years agoPost 6
enginetorque

rrApprentice

North Wales

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centre (ter...) hubs
I have been flying several x400's from day 1 - never had a centre hub fail in flight despite pushing the machine to the extreme that makes the blades flutter and howl - I can only think that failures are down to poor set ups - out of balance blades/flybars etc. I have experienced two broken hubs in severe crashes (like a death spiral from 100 feet straight in) which saves all the fiddly bits, a crash that was so hard the boom was L shaped and the flybar S shaped - frames just bent a little - pretty impressed at that. Wonder how many others have had a hub fail in flight?

two pumps and a squirt

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02-08-2006 06:15 PM  12 years agoPost 7
hghlndr85

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northeast, PA

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hmm considering ive been flying helis for 2 years and my blades are brand new and freshly blanced adn track straight i think ur idea proves FALSE!

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02-09-2006 04:25 PM  12 years agoPost 8
enginetorque

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North Wales

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Just lucky then?
I am only suggesting that MIGHT be a reason - some build well - others strip every thread and blame "soft" screws - I have no way of knowing where you fall here - if your blades and flybar are balanced then the centre hub should be fine - yours break and I can't know why from here but mine have (so far) been fine. As I say, in a crash mine broke but boy, that saved a lot of damage that would otherwise have taken place.

two pumps and a squirt

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02-09-2006 05:53 PM  12 years agoPost 9
Squirrlybird

rrVeteran

Suffolk, Va US

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I have heard both stories on the center hub. Some say that it saves money when it breaks and others that it causes more damage. I had 3 crashes with the plastic hub before I put the aluminum one on and my experience is that the plastic hub caused too much damage when it failed.

3 crashes!! You would think that I would have upgraded at least on the 2nd one. Oh well, I have the aluminum hub now. I also have about 3 crashes on the aluminum hub and it really helps save the rest of the head, in my opinion. I never had a hub fail in flight though.

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02-09-2006 10:49 PM  12 years agoPost 10
BooYa

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Nashville, TN

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Yup, just got me too. The center hub just 'twisted' apart (fortunately I was in a hover). I can't believe it. You'd think being this is the ARK400 that these problems would be sorted out by now.

Anyway, I think its time to change out to upgrades all way around!

What are you guys using for a tail slider? Are you using the stock blade grips with the metal hub? What about above the swashplate?

What upgrades are better (ie upgrades from Tower or.....??? )

Thanks-

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02-10-2006 04:03 AM  12 years agoPost 11
zo6

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Ohio USA

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Enginetorque's reply sound like a typical costomer service/tech support reply. They too usually try to blame it on the costomer. The truth of the matter is that some new products are field tested by the costomer. I have been doing RC for 35+ years and this has always been a problem. Some manufacturers do not field test their products thoroughly enough or fix a problem before releasing it to the public.

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02-10-2006 05:26 PM  12 years agoPost 12
enginetorque

rrApprentice

North Wales

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nope
Nope - not a "blame the punter" remark at all - if I had experienced a failure I would put it up on the forum like you chaps - I have experienced failure of the boom support saddle clamp - the odd undercarriage leg and the see saw pivot screw but that's it - I have X400's with AON 3500 and other brisk motors and using carbon - glass and wood blades - centre hub failure in flight to date (at LEAST a thousand flights......) nil! - Now then - there is one proviso - I live in the west side of the UK and it's "damp" or "moist" (pissing it down mostly..) and that makes plastic less brittle - could be that you chaps have it too good weather wise!

two pumps and a squirt

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02-13-2006 02:09 AM  12 years agoPost 13
DDwaneR

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Huntington, WV-USA

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MX-400 Center T Problems!
My MX-400 had a bad Center T from the factory!
I checked the blades before use for balance weight etc and they were ok. The heli shook on rev up and the blades were out of track about 5mm, but after the head speed came up the blades would then track and they would stay in track as long as the head speed stayed up. I got about 10 flights before the head pooped off during a flight. I made a turn and the heli lost some altitude, I poped the collective and pulled back on the stick and the head pooped. I was about 1 foot from the ground and forward speed was almost stopped. The T hub had broke, the blades were ok, the main shaft was ok but the T hub was broke and the levers and rods were broke. After the 5th flight or so the startup shake problem had stopped, probably because the plastic had stretched.
I replaced the head with a T-Rex XL head parts and used my Shogun 285 carbon fiber mah blades. I have over 60 flights on the machine now with no head problems. I also put a T-Rex SE tail box on it, I did not like the plastic tail blade holders, I have had this type of holder crack at the blade screw.
I called Hobbico about the Center T problem 10/31/2005 and they said they would send me a replacement. Hobby Services invoice date was 01/13/2006, I got the replacement part near the end of January 2006.
I had the MX-400 fixed after the head poped off within a week with T-Rex parts.

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02-14-2006 06:40 PM  12 years agoPost 14
turbo35

rrApprentice

Southern Ohio

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My advise is to upgrade the whole head assembly to the T-REX aluminum head and go fly. I purchased an MX400 flew it twice and upgraded the the complete head. What a difference in performance and stability. The money you spend on the better head is well worth the return on the investment. I also changed over to the longer TREX tail boom and tail rotor assembly. Thats where the term T-mix400 comes from. Try it, you won't be disappointed.

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02-14-2006 11:07 PM  12 years agoPost 15
DDwaneR

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Huntington, WV-USA

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XL or SE
I got the XL parts for about $65 in a upgrade kit. I wasn't sure I could make the parts work. The SE head parts were $130 for the upgrade kit and was out of stock, so the XL would have to do and it did.

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02-15-2006 12:43 AM  12 years agoPost 16
BooYa

rrNovice

Nashville, TN

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Yeah, I'm waiting for all the bling heli max has to offer above the swashplate. Problem is, its backordered till late Feb!

Should have ordered trex stuff but oh well.........

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02-17-2006 11:25 PM  12 years agoPost 17
usagent

rrApprentice

pr.

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same
thing happen to me the dam hub broke off in a mild loop man i wish i had my trex back LOL

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03-11-2006 04:21 PM  12 years agoPost 18
mspaterick

rrNovice

Knoxville, TN

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mx400 pro rotor head
I recently got a mx400 pro. while setting the helicopter up I noticed that if you grab the main blade grips and pull them out then push them in to the center one blade would move almost a 1/32 of and inch. Has anyone else noticed this same problem? I removed the bolt holding the main blade grip on and shimed it with a 3mm washer under each nut. The result was no slop in the head. Could that be the source for the heads failing in flight?

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03-11-2006 08:47 PM  12 years agoPost 19
Squirrlybird

rrVeteran

Suffolk, Va US

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It is not a problem due to centrifugal force holding the blades apart.

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03-11-2006 10:20 PM  12 years agoPost 20
mspaterick

rrNovice

Knoxville, TN

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center hub problem
with the centrifical force, one blade is out farther than the other approx. 1/32" If you push it towards the center it will move in. Then the margin between the hub and the blade grip are equal on both sides of the hub.

If you balance the blades perfectly, then when the blade grip and blade moves out 1/32" the whole head will be out of balance. The tip of one blade will then be 1/32" farther from the axis of the main shaft therefor the trakcking will also be off.

If you have them both pushed in when you spin up the head, and one moves in flight you become unbalanced and loose blade tracking.

Thanks
Mark

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