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HomeScaleAircraftScale HeliScale Helicopter Main Discussion › Vario EC135 finally finished !! ( pht3 )
05-30-2012 12:37 AM  6 years agoPost 1
heliVoYrrVeteran - NJ - My Posts: All  Forum  Topic

Vario EC135 finally finished !! ( pht3 )

Watch at YouTube

I got a total of 5 flights on the EC135 this weekend. Unfortunately there will not be any more flights on this helicopter for a while until it is repaired :blowup: ... ON first spool up, the main rotor disk was way out of track and causing some serious vibration. I was surprised it was this bad as all blades were set up to each other within 0.1 degrees. I put tracking tape on the blades, spooled back up, and now they were in track. I assumed the blades may have been bolted on too tight the first time ... so off I went flying. The fenestron with a 1:1 ratio in the tail box is definitely not enough with a EC135 around 28 lbs (dry) I had a hard time making left hand turns, especially against the wind. I had to bail out and reverse a few turns to the right. another 10 - 20 % on the tail RPM would likely be good enough. ( i already purchased the century gear sets ... )

So on the 6th flight, I spool up the turbine and at around 80% the helicopter starts to shake a bit more than it should while blades come on track. A throttle back and it starts to bounce around off of the head, and bouncing on the skids. As it slowed i could tell this was coming off of one particular blade on the rotor disc. Crap was now getting thrown off of the heli, and then the blades came down and chopped into the tail and fenestron housing /

on one of OF Modeltechnik head blade grips locked up in the hub. The element inside was cracked and jamming. It jams sometimes and sometimes it does not depending on how it shifts internally. One of the of the blade grips also has no stop, and the tension that keeps it at center when disconnected is mostly not there. This was defiantly a head failure. I wish i had kept the Vario head now, especially as now i'm hearing from a few guys that several helis have been lost because of faulty OF heads ( early generation parts as i understand)

I have to determine how bad the damage is and if I will be able to fix the fuse, or if it makes sense to just rebuild a new fuse. Besides the rotor head, all mechanics are ok.

~V~

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05-30-2012 01:45 AM  6 years agoPost 2
Mojave

rrElite Veteran

Palos Verdes, Ca. USA

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What an awesome heli! Sorry to hear about the damage...
Barry

All helis and planes have an expiration date stamped on them...you only find it after you crash!!

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05-30-2012 06:31 AM  6 years agoPost 3
Double Decks

rrApprentice

Poole Dorset

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EC 135
One Word,
STUNNING

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05-30-2012 07:59 AM  6 years agoPost 4
Desert Fox

rrNovice

Atlanta, Georgia - USA

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Rotor Cap
heliVoY,

Check your rotor cap orientation. I believe your cap gaps should be over your blade grips. You maybe getting some interaction between your blade grips and your rotor cap.

Desert Fox

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05-30-2012 09:45 AM  6 years agoPost 5
PETER ROB

rrElite Veteran

Devon UK

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This was defiantly a head failure.
Sorry to hear of your misshap
All the damage to the head, was the same as I experienced, after I chopped the tail on an EC135,
I was asked to supply a video, of the 135/PHT3, I just put on the OF head and blades, and was not too concerned, about too much as it was only a turbine run up and cool down video
Unfortunatly I had to much negative, and on spool up the blades chopped the tail
On damage inspection all the points you raised about the OF head were the same as mine
It is very difficult to pinpoint the cause of any crash/damage after the blades hit something solid
I took a loss on the sale, but the new owner did an excellent rebuild and the heli is now flying albeit not with an OF head
Peter R

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05-30-2012 05:34 PM  6 years agoPost 6
heliVoY

rrVeteran

NJ

My Posts: All  Forum  Topic

true, its hard to tell what caused a mishap after there are pieces to pick up ... I do think however it was one of the blade grips that caused the problem in this case considering how the issue progressed, and based on the pref flight check ... I'll never know for sure. I like how the head flew, and i know they are a good product.

Now, who sells OF heads / parts these days ?

~V~

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05-31-2012 12:59 AM  6 years agoPost 7
chprman

rrApprentice

Torrance Ca. near Los Angeles

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If you do some more research hear and on scale rc helis web site you will see a repetitive issue with the OF head. I had the exact same thing happen to my Xcell. These heads are very prone to ground resonance as like full size helicopters. There are a lot of videos on you tube about helicopter ground resonance.

Sorry for your loss but you might try the Vario head.

Alan

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05-31-2012 01:20 AM  6 years agoPost 8
deanguy

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TX

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Al Wert from Starwood did.. not sure who does now.

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05-31-2012 01:37 AM  6 years agoPost 9
AltecLansing

rrElite Veteran

North Carolina

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That is such an incredible heli. I hope you can repair it.

Man, I miss the eighties.

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06-01-2012 06:48 AM  6 years agoPost 10
Totto

rrApprentice

Norway

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Really sorry to hear about your mishap ! Such a nice job on the model.
I have been flying with the OF heads for a long time and have not experienced any issues with them. They flies so nice without any kind of electronic stabs systems. You have really been unlucky here.
Good luck with your rebuild of this great machine !


Best regards
Totto

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06-01-2012 02:40 PM  6 years agoPost 11
shawmcky

rrElite Veteran

Isle of Wight,United Kingdom

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Awesome detail,such a shame about the strike.Wish i had the patience to build such a heli.

Team- unbiased opinion.K.I.S.S principle upheld here

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06-01-2012 06:16 PM  6 years agoPost 12
paul999

rrApprentice

ilford essex

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sorry to hear about your mishap,iv been trying to decide what head to use on my scale ec145 i was thinking of but now wounder if i should go with vario 2 bolt head any surgestions welcom guys,,, hope you get your heli fixed you have done so much detail work i can only just imagin how bad you feel
regards paul

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06-01-2012 06:28 PM  6 years agoPost 13
spiderco

rrVeteran

Henderson, Nevada

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GORGEOUS, sucks about the mishap.

fly til its dry

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06-03-2012 01:09 PM  6 years agoPost 14
heliVoY

rrVeteran

NJ

My Posts: All  Forum  Topic

thanks guys ! ...

So i have a replacement tail boom assembly on order from Joe at Eastcoast Vario , and a new head on the way. The newer OF heads have had some issues resolved on the grips as i understand. Also, i can definitely use some more RPMs on the fenestron. Left hand turns into wind are difficult with the stock RPM set up .. Another month or two and hopefully i will be posting more pics ....

~V~

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06-03-2012 01:34 PM  6 years agoPost 15
Héli Suisse

rrApprentice

Geneva Switzerland

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Vojtek
Another month or two and hopefully i will be posting more pics ....
I'm looking forward to watching new pics and reading good news from your heli

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06-04-2012 07:34 AM  6 years agoPost 16
PETER ROB

rrElite Veteran

Devon UK

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more RPMs on the fenestron
All Vario turbine 135's (fenestron) seem to suffer from tail authority
Vario fitted a speed up gearbox to the mechanics but this does not work, and was very noisy
I fitted the Vario speed up gears to the gearbox 22t driving 19t,
this helped but did not cure the problem
I had some custom helical gears cut, this worked but was very expensive, that 135 is still flying many years and 5 owners later
Recently I made a couple of speed up box's, not tried them yet,( the Gazelle is on back burner) but am confident they will be very effective
Worth the effort
Peter R

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06-04-2012 01:30 PM  6 years agoPost 17
heliVoY

rrVeteran

NJ

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Nice work on the gear box Peter! ...

I ordered some helical gears from Century that will work well after some milling down on the backside to make them fit. .. Its around a 15% increase in speed which should be just right for getting a little more aggressive in he left hand pattern . I will definitely report back on how this works out.

Also, i found after only a handful of flights that he main blades had signs of heat damage :/ . Fiber weave is showing slightly. I already ordered a set of M Blades, so that reaffirms my decision to go Aluminum.

~V~

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06-04-2012 09:27 PM  6 years agoPost 18
Héli Suisse

rrApprentice

Geneva Switzerland

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All Vario turbine 135's (fenestron) seem to suffer from tail authority
Vario fitted a speed up gearbox to the mechanics but this does not work, and was very noisy
I can't but fully agree with Peter on that topic.

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06-04-2012 09:28 PM  6 years agoPost 19
Héli Suisse

rrApprentice

Geneva Switzerland

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I already ordered a set of M Blades, so that reaffirms my decision to go Aluminum.
You certainly do well that's the route to go!

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07-10-2012 07:02 PM  6 years agoPost 20
heliVoY

rrVeteran

NJ

My Posts: All  Forum  Topic

I got the new tail boom in from Joe at EastCoastVario .. time to chop the damaged one off and rebuild the new one .. should not be too much work .. Most of the details were on the fuselage after all ..

Would anyone have the wood fenestron fitting ring left over from your EC-135 build ? i'm looking for one of these to fit up my boom/gearbox ..

thanks !

Wojtek

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HomeScaleAircraftScale HeliScale Helicopter Main Discussion › Vario EC135 finally finished !! ( pht3 )
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