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HomeTurbine✈️Aircraft🚁HelicopterTurbine Helicopters › Turbine Cuatro FOR SALE
05-27-2007 08:10 AM  13 years ago
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Sparkhead

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Melbourne Australia

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Turbine Cuatro FOR SALE
Well looked after with about 70 flights under its belt.


Mick.

Robbe & Futaba.
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05-27-2007 08:31 AM  13 years ago
Helihover

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Norway

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I am terribly sorry for your loss Seeing pictures like this isn`t any fun, I really do hope that it is possible to repair at least the turbine.

Best regards
Helihover
Tried planks, but after all, wood is best on the bonfire.
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05-27-2007 10:29 AM  13 years ago
Sparkhead

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Melbourne Australia

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Hi Helihover,

It was quite a sickening feeling seeing it fall to the ground after it self destructed in mid air. Oh well its the risk we take with this hobby.

The secondary stage of the turbine is kicked over about 10 degrees and is locked up solid, the front half is spinning but who knows whats happened to that.

Mick.

Robbe & Futaba.
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05-27-2007 12:04 PM  13 years ago
PETER ROB

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Devon UK

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Sparkhead When I put mine through a tree similar, damage to the turbine as yours It cost me £200,00 British pounds to get fixed by JetCat, came back good as new
When you say self distruct in mid air would you like to elaborate
Peter R
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05-27-2007 12:46 PM  13 years ago
Sparkhead

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Melbourne Australia

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Hi Peter,

That sounds like good news about the repair costs. Was your second stage bent and seized? I can only hope the bill will be that low.

It was a strange issue with the heli, I flew along fast and straight, then I pulled up to 90 degrees and it climbed about 100 ft then I pulled again to inverted and was going to do an inverted pass back again like a big square. When I did the second 90 degree pull to inverted I pulled back on the throttle stick to maintain level flight but the heli very sharply went another 90 degrees and pointed straight back down to the ground. Then it went another 90 dergees back to upright then flop around a few more times before it did a big boom strike. Parts flew everywhere and everything just fell to the ground from about 100 feet or so. All of the servos seem alright and they were all still connected to the swashplate. One of the bell mixers has a ball missing so thats about the only mechanical part I can fault and who knows if that happened when it hit the ground. The way it way flopping around I can only assume that this ball link broke away.

I have some footage of it coming so hopefully I can slow it down enough to see if the blade was flopping around.

Mick.

Robbe & Futaba.
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05-27-2007 02:18 PM  13 years ago
heliman53

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Charleston, Sc

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Usually when the second stage locks up like that it is due to the power turbine wheel contacting the housing. This usually means an undersize turbine wheel. So replacement of the turbine wheel and spider housing likely will be neccesary. Craig B
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05-27-2007 03:21 PM  13 years ago
PETER ROB

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Devon UK

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Was your second stage bent and seized?
Mick When mine went through through the tree it hit a very large,solid branch, and looked like a conccetina,every thing was bent and seized up, when it came back from repair there was even the new shaped gearbox fitted
The reason for asking how it happened was I had a similar disaster with a Robbe head
Although there is a lot being done with turbine conversions, there does not seem to be a lot being done to beef up the rest of the components,so in the end some thing has got to let go,
On my acrobatic I have 3,5mm carbon fibre side frames and base plate, metal blade grips, and a wider drive belt,also the push rods are 3mm, this is only some of the things that need doing

My XLV/JetCat SPH5 conversion, has gone to a new owner, he had initial problems with the slow headspeed, and wanted to speed this up, to get the machine even more stable in the hover, Vario have said the blade grips are only good up to 900 Revs with the stock blades on, I was flying at 830 Revs so there was a little extra headspeed to be gained, but I would not like to chance any more than 900 Revs, not a problem in the hover or in gentle scale like flying, but the higher head speed will alow the pilot to start doing more agressive manouvers, this is where I think, the breakages will occur
Peter R
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05-27-2007 03:44 PM  13 years ago
Qrrambero

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San Francisco / Bay Area

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Mick & Peter you are scaring me. I fly my Cuatro with 1,650 RPM head speed.
Mick how does the head block looks like? I still have the original Robbe in mine.
Ae
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05-27-2007 04:20 PM  13 years ago
PETER ROB

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Devon UK

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1600 Head speed
Qrrambero I fly my Acrobatic at 1600,in idle up 1, and 1680,in idle up 2
no problem, I only fly at 1680, idle up 2 when I am inverted and want to climb out in a hurry, at 1600 it will hold but not climb out very fast
STOP WORRYING, all this turbine technology is new, the only way to find out if you are flying within the machines capabilities, is to test to distruction, (crash damage, and pilot error not included), that may have over simpyfied the answer, anybody else want to put their 2 bits worth in?
Peter R
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05-27-2007 04:30 PM  13 years ago
Mark Spies

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Houston & LaPlace

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Sparkhead,
Very sorry to see you loss,I sure hope that you will get her back into the air soon.I too have had a few near losses due to ????.I am trying to see if it is a reciver problems,running a G3 in it.Steve had it lock up and shut down at Mayday,good thing it was only 2 feet up when it happend.Looks like the robbe power switch was drawing too many amps,so we took it out and went right into the battery from the reciver.Last Saturday it locked up again but the turbine did not shut down like before.I am going to try a 149DP in it and see what happens.I have been flying it with no problems untill now,I have ck everything and all looks good.We will see....
Anyway, take care and again good luck getting her up again, Mark
Team Can't Get Right Starwood Models
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05-27-2007 09:10 PM  13 years ago
seattle_helo

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Seattle, WA USA

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Mick, very, very sorry to see that.

Hopefully the video will provide some good clues and maybe even the answers.

nick
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05-28-2007 08:13 AM  13 years ago
Sparkhead

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Melbourne Australia

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Craig B the reason the second stage is locked up is because of crash damage, the turbine wheel will be hitting the inside because it is bent sideways.

Peter, it sounds great that Jetcat fixed yours up so cheaply. I'll be wrapped if they do the same for me.

Ae, the more I think about the behavior of the heli before it boom striked suggests that the ball link ripped out of the bell mixer. I'd be upgrading them to metal if you are still using the original plastic ones. I know they are nice and thick but the thread on the actual ball isn't really all that long to get a good grip.

The Ramster headblock still looks perfect. It should be fine because it copped the original boom strike thud but the heli landed reasonably upright so the head didn't cop the thump of hitting the ground.

Mark, thanks for the comments. There is nothing worse than a fault like you have. Bellbloke had the same sort of issues and it didn't end very well for him. He may have some suggestions for you.

Nick, yes the footage will hopefully back my theory about the free blade. It will be interesting to see if it can be slowed down enough the notice something like that.

Mick.

Robbe & Futaba.
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05-28-2007 10:31 AM  13 years ago
coolice

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Northamptonshire, England

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Hey Mick,

Very sorry to have read about your mishap, it is the one thing no one wants to see happen and is all what we fear.
I hope you will soon get the model up & running again.

From your description is does sound like a link failure, during the inverted part of the loop and this then allowed the blade to flap in flight and then boom strike.

Mark, somewhere on this Turbine forum I have posted previously about the worry of using Futaba's G3 PCM system on models.
While some fliers are having no trouble at all, others more specifically flying carbon machines have had major lockouts.
I know in the UK of my fellow Century fliers reverting back to normal 1024 receivers due to their G3's causing crashes.
A search on RunRyder will reveal you are not alone with this glitching.
.
Ian Contessa
Team Robbe SchluterUK
Midland Helicopters
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05-28-2007 12:57 PM  13 years ago
heliman53

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Charleston, Sc

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I had a similar thing happen on my Acrobat just two days ago. I flew a 12 minute flight and was just coming in to land when about three feet from touch down the engine flamed out. The HDT read RX PWR fail! I checked all the suspect items batteries, wiring etc no fault found. Did a hover 6 inches off the ground and at 4 minutes got a Collective hit, dropped a few inches and returned to normal almost instantly. last night I took out the G3 rx, replaced the duralite regulator and the switch harness, today we shall see. Craig B
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05-29-2007 10:18 PM  13 years ago
sharam

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Northern California - Fly at Morgan Hill Field

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Aww, man, I am sorry for your loss.

I have a Cuatro (regular IC engine) and I know how awful I would feel if I put it in, so I can imagine how much worse you feel.

Hope you get it back up again soon.
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05-30-2007 07:30 AM  13 years ago
ferret

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victoria australia

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mic
hey mic how r u. you have to admit in hind sight it was spectacular. i hope you get the other in the air... if not i might have to do what patty said and purchase a 2nd hand turbine unit
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05-30-2007 12:47 PM  13 years ago
Sparkhead

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Melbourne Australia

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Hi Ferret,

Well the whole unit is off to Germany for a rebuild so hopefully it will be back soon as good as new. If they look after me as well as they did Peter R I'll be stoked but I'll have to wait and see.

That was me joking with you on arc, I was just using Patty's computer.

Mick.

Robbe & Futaba.
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06-01-2007 09:04 AM  13 years ago
mcfast

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Quebec Quebec Canada

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I just wont to cry when I see that!
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06-04-2007 07:54 AM  13 years ago
ROB-builder

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Nottinghamshire - UK

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Turbine Crash
Mick

Looks to have been a nasty one.

Is the airframe damaged with the impact as it looks like most of the usual crash damage parts are totally wrecked.

Hopefully the turbine will not be to expensive to repair but it sounds like it has taken a real ding.

Rob Walker
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06-04-2007 08:02 AM  13 years ago
Sparkhead

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Melbourne Australia

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Hi Rob,

The whole airframe is pretty much a throw away, the parts that still look ok in the photos are twisted and bent as well so I will have to put a new one together. Fingers crossed this will happen in the next week or so. When are you starting your project?

Mick.

Robbe & Futaba.
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