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HomeAircraftHelicopterFuel-Helicopters New or Limited ActivityNext D › [ENV] Tail Hub Failures
05-13-2011 11:47 AM  7 years agoPost 21
bkervaski

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Birmingham, AL, USA

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Guys, when were these kits purchased?

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05-16-2011 07:08 PM  7 years agoPost 22
tfagermoen

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Norway

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I bought mine in the beginning of march from ExperienceRC.

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05-16-2011 08:04 PM  7 years agoPost 23
bkervaski

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Birmingham, AL, USA

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Great, my second kit is from that batch and vendor, lol, awesome!

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05-16-2011 08:05 PM  7 years agoPost 24
cyr

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france

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October 2010 and February 2011

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05-16-2011 08:19 PM  7 years agoPost 25
rcnut

rrElite Veteran

Rockford, Illinois

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September 2010.

Mine was the replacement tail drive gear.

Team Miniature Aircraft
"I love the smell of Nitro in the morning!"
...Citizen 654!

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05-21-2011 11:57 PM  7 years agoPost 26
briand

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Cincinnati, Ohio - USA

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Thanks

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05-22-2011 05:33 AM  7 years agoPost 27
scott s.

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Orange, Ca.

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sorry
i`m looking and looking but i don`t see the difference

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05-22-2011 08:50 AM  7 years agoPost 28
DOKEY

rrProfessor

Northamptonshire UK

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sorry

i`m looking and looking but i don`t see the difference
Look at the face of the hub, it looks tapered?

It maybe the cause, never know, has that caused something else to be miss aligned or has it put more stress on one side.
Sure it will be sorted soon though.

Ryan.

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05-22-2011 01:26 PM  7 years agoPost 29
Sky Dancer

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Bryan, Texas

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The face of the hub does not contact anything for the purpose of mounting the hub. The hole for the shaft is the only alignment while mounted.

I don't believe the taper that is viewed on the side of your hub would be of much importance with regard to balance or a failure of any tail rotor hub. The broken hubs I've seen in photos, appear to have broken where the shaft meets the hub and I hear that's being addressed.

I believe most helis that have had TR hub failures might be running very high head speeds and probably hit a resonance frequency that vibrates badly and could cause a hub failure. I remember flying other helis that if you ran the head speed up high the tail hub
would explode.

I've been flying my ENV for quite a while now and have never had any problems with TR hubs. I run a max head speed of 2080!

I'd just check the run out of the tips of your tail rotor blades to see if anything is machined out of alignment, then fly what you have and don't worry about it.

Don C

Keep up your rotor speed !

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05-22-2011 07:55 PM  7 years agoPost 30
briand

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Cincinnati, Ohio - USA

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..

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05-25-2011 06:26 PM  7 years agoPost 31
husafreak

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Livermore, NorCal

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Please let us know ASAP when the hubs are in, mine is OK so far but I totally destroyed my Srimok due to tail hub breakage on that (different of course) machine. Still, makes me concerned...

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05-26-2011 08:05 AM  7 years agoPost 32
tfagermoen

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Norway

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Sky Dancer:

I run a headspeed of 1950, so I don't think to hight headspeed is the reason that my TR HUB snapped off in the air.

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05-26-2011 01:37 PM  7 years agoPost 33
rcnut

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Rockford, Illinois

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tfagermoen, I don't think it is solely based on head speed. Tail RPM is a factor and the faster the RPM the sooner the failure. However, I believe it is the metal itself. Hardness, composition of the metal, purity, etc. But then you need to calculate in the human factor, that's possibly 70% of the problem...made on Friday, how fast can we knock them out, cut back on quality...

It would be cool if we could charge the manufacture's for the destruction done to our heli's..... We wouldn't see defects any more!

Team Miniature Aircraft
"I love the smell of Nitro in the morning!"
...Citizen 654!

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05-26-2011 04:16 PM  7 years agoPost 34
husafreak

rrKey Veteran

Livermore, NorCal

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If we all contact the manufacturer directly then Brian will have a list of all of us who want the upgraded hub, if the list is long enough it may speed production. Is it better to PM Brian or to call CY enterprises ?

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05-26-2011 05:10 PM  7 years agoPost 35
scott s.

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Orange, Ca.

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i did PM Brian
on 5/17, he said whoever is making them should have the new ones sent over in a week so i would think that means by next week at the lastest they (new hubs) should be here

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05-30-2011 01:26 AM  7 years agoPost 36
paverpilot

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Corona Ca. USA

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Ok, after hereing about all the tail hub failures i have got myself a Kasama tail for my new build, i got the the one for the Vibe 50/90, i have installed it and it is a purfect fit,the only problem I see is that the grips are little shorter so i think i will run 110 tail blades , I have been using Kasama tails on my Fbl Align birds for a while and I have never had a problem, i can post pictures as soon as the camera charges

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05-30-2011 09:32 AM  7 years agoPost 37
cyr

rrNovice

france

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Hello guys

This weekend, once again, I had a tail hub failure on my nitro ENV (third time in 30 gallons).

BUT, this time I was using a hub machined by a small french company, specialized in CNC machining. This hub was made of 42CD4T alloy.

I have been testing it doing entire flights of hard piro reversal maneuvers with high yaw rate, to stress the hub... and finally it failed.

So today, I can say that the issue does not come from the material used by NextD to make the ENV stock hub.
For me, it is now manifest that the problem comes from the design of the part.

THE solution would be a 5mm hub, that would increase the strength of the hub by 25 %.

cyril

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05-30-2011 04:17 PM  7 years agoPost 38
husafreak

rrKey Veteran

Livermore, NorCal

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So many helis with this design of hub have these failures. I would have thought the plastic grips would put less stress on the shaft. Maybe plastic tail blades would help for now? I had one the same way on my Srimok and didn't Trex 700 have some? Maybe the industry standard is not stout enough, thanks for sharing.

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05-30-2011 11:38 PM  7 years agoPost 39
Buzzin Brian

rrProfessor

College Station, Texas

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Guys we just got back in the US, but from what I understand the new hubs are in. I will verify that tomorrow and will let you guys know.

Brian

Build it, fly it, crash it. Repeat as often as needed.

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05-30-2011 11:47 PM  7 years agoPost 40
husafreak

rrKey Veteran

Livermore, NorCal

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Thanks!

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