RunRyder RC Helicopter Topic - New Project -Rotortech Zealous With Wren Turbine

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Got Jet Fuel? Turbine Helicopters > New Project -Rotortech Zealous With Wren Turbine

MattJen
Elite Veteran
Location: UK

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I bought one of these a few weeks ago, and have been dismantling and rebuilding over the last few weeks.

I like the design, a very simple set up and well engineered, i love the gear box, which has its own circulatory system totally seperate from the turbine.. almost mimmicking the full size...

The blades turned up today the Hotcat was sold and the guy is very happy with it.

i went for the biggest blades that MAH do, 950mm blades which is the min for the zealous or longranger. the head has a 10mm spindle and it sits on a 15mm main shaft with supporting sleave..

The gear box is a 90degree one and enables the turbine to be put up in the scale position..

I have finished all the wiring, and the radio is fine, i just need to tidy up the cabling and i will be building my new turbine this weekend, i am waiting for the second stage to be delivered but i have started on the first stage, i love the fact that if i need power i am not limited by blocked settings from the manufacturer, i could turn up the power until it blows the head apart...i will run it at 1280/1350rpm which is what i think will make for a stable Scale machine as and when i go down that route..

My aim is to fly this machine in pod and boom formatt before stepping into scale...

01-29-2009 01:33 PM

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darrens
Key Veteran
Location: United Kingdom

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Hi Matt,

Well done, that looks sweet. I assume you are planning to build it into a JetRanger in time. Having seen one of these, it leaves lots of cabin room to add all the detail you could wish for.....very nice!

However;

Quote
I can turn up the power until it blows the head apart... which is what i think will make for a stable Scale machine

I'm guessing that could make it a little unstable!!!!

He who dies with the most toys is the winner!

01-29-2009 01:42 PM

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MattJen
Elite Veteran
Location: UK

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thanks darrens

The scale cockpit will be great to do, all the batteries run down a centre column from above so no wires are shown at all, and the rear of the fuse has a door which opens to a large cavity where you store the gas bottle oil pump fuel pump and oil sump, so everything is all hidden...

I went up and looked at scalers LongRanger - a guy called Steve,
he was well helpful in showing the potential with time the standards you could achieve...

Paul999 has offered to help me make some moulds i have already got dash board photo's which i am gonna scale down and put behind perspex, as Lee Marshall recommends...

i mis typed, i editted the post to could turn up power rather than turn up the power

Nice to see your machine back in the magazine, it makes such a change to see different well built scale machines rather than the same old ones... your models give beginners to scale building like me, something to aspire to...

Matt

01-29-2009 01:47 PM

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darrens
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Location: United Kingdom

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I must admit, I have always looked at that fuse and config as it gives such an opportunity to make the cockpit and cabin absolute scale and would be worth the time and effort. will you also go flybarless which would look awesome?
The power bit was a joke of course

Keep us posted and I will look forward to your build thread.

Cheers
D

He who dies with the most toys is the winner!

01-29-2009 02:12 PM

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MattJen
Elite Veteran
Location: UK

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yeah i will go flybarless, the head is designed for changing over to that with minimal of adjustments.

I am waiting for Dennis Strettons final review on the helicommand before i decide wether to go down the Vstab or other makes, as i hear there are some newer ones due out soon..

Thanks again for the comments, i look forward to reading your build thread in the magazine, you deserve some recognition for finally sorting out the fenestron tail...

Matt

01-29-2009 02:32 PM

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Bell Bloke
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Whats it weigh Matt, with and without fuse?

01-29-2009 02:39 PM

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darrens
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Location: United Kingdom

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Thanks Matt

He who dies with the most toys is the winner!

01-29-2009 02:57 PM

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MattJen
Elite Veteran
Location: UK

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Whats it Weight with and Without Fuse

Without - 10.5kilo

With - approx 13kilo.

Matt

01-29-2009 11:32 PM

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Red Machine
Senior Heliman
Location: Leeds - Yorkshire

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Another new heli!!!! Blimey you go through more than me!!!!

I had a little hover with Sean Browns sometime back and it was sweet (if a little tail heavy).

Keep us posted on how you go with it.

Vario R22 / Vario Turbine Lama / Vario EC155 / Vario MD900 Turbine Hybrid / Synergy N9

01-30-2009 10:45 PM

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MattJen
Elite Veteran
Location: UK

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Hi Red,

More than you, NEVER!

I have just been hunting for a good machine, as all the ones i have flown there has always been something not to my liking ie poor tail authority, flew like a dog and were underpowerd,..and only ever use a single stage turbine..

i wanted a scale that had the turbine in the proper position utilising a two stage.. Hence the reason for beginning this way.. although i recived a PM from someone who was following my thread, last week saying the Longranger fuse has been discontinued so i am now thinking of other options as i know they are coming out with 2 new ones soon..

thanks for your comments, hope your projects are coming along as well, see you later this year hopefully.

Matt

01-31-2009 08:46 PM

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MattJen
Elite Veteran
Location: UK

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I finsihed my Second Wren turbine yesterday and despite the cold managed to start it up and do a test run, i got someone with a lot of turbine experience to just check over my work, and do an engine run.

The FOD on this turbine is specific for the Zealous and not the normal part you get with a wren turbine,the reason this FOD is different is it has 2 metal runners on the front to enable me to bolt it in between the main frames in the scale position..

We piggy backed it to the predator Wren and it fired up straight away,
I also wanted to see if it would flame out if we pumped the throttle from maximum to low quickly, as i have always been told these turbine flame out and you have to mess around with the Fadec settings.

Well as the video shows this is not the case, which backs up what i was told by the manufacuterer, NEVER MESS WITH THE SETTINGS,

The second stage is on its way after i sent it in to get the gear boxed serviced as i bought it second hand and it had beel flying for 3 years and clocked up a lot of flying hours, so i wanted it to be as good as new for fitting into the zealous,it has only taken 3 days to service and turn it around,which i am very happy with.

Matt

02-01-2009 02:00 PM

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Bell Bloke
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Matt have you drilled a hole in your new engine case? you appear to have a 'Twin Spark' Wren 54.

I have to say I still cant get used to that Zealous fod guard on your engine, it makes it look like the Wren MK1, or some kind of Frank Whittle prototype.

Mind you it makes it look more scale.
Martin Briggs painted his fod, silver which made his engine look, well, more engine like.....

02-02-2009 02:12 AM

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MattJen
Elite Veteran
Location: UK

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Hi Bell

yeah i realised the picture i put up of Steve's Longranger turbine is different to mine..

I like the idea of spraying it silver, i may have a go at that..

Matt

02-02-2009 07:19 AM

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Bell Bloke
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Sorry, what I meant was that Martin painted is green one silver, yours looks fine as it is.

02-02-2009 10:28 AM

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MattJen
Elite Veteran
Location: UK

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Ahh,

wondered what you were on about, been playing in the snow with my FAMILY, having fun making snow angels.. good fun with the kids...

Am waiting for lypo to come for fadec,nothing else to report at this moment.. next thing will be the mounting and plumbing of the turbine..

Am looking forward to it..

Matt

02-02-2009 09:12 PM

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Bell Bloke
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Have you got that gearbox back from Wren yet, it's been a week now...

Must be the snow.

02-04-2009 10:09 AM

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MattJen
Elite Veteran
Location: UK

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Yes it is being delivered today, Snow had slowed up the post..

it still has been only 5 days, for a strip down, and service..

I am gona take out the mast bearings today and see if there is any markings, in particulasr if they are C3 bearings, cos i orderd a set of C3 bearings, forgetting that the mast bearing should be replaced with the exact same spec...

I have given up trying to get hold of rotortec, it doesnt help with the 9 hours ahead time difference, as it means i have to stay up till 1am to speak to them..

I want to know if they are self aligning bearings as i noticed there is no thrust race on the main shaft, which considering it is a 15mm shaft swinging 1 meter blades, i would want to know what takes the side load.

Matt

02-04-2009 10:40 AM

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Bell Bloke
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That early warning oil pressure light for the Zealous Wren gearbox you asked me about Matt. I think I may have an idea for it.
As you folks may or may not know (and I didn't), the Zealous, Wren has a really neat oil lube system to the gearbox, just as on the fullsize (probably

) It uses a dry sump system to pump oil from a sump with a magnet in

up to the gearbox and back. It's a great idea because you can see the oil going to the box and to the sump. The only thing is if the pump stops it would be good to have an oil light to tell you.
So I thought about making some kind of pressure switch or flow switch.
At first I thought it would be a simple conductivity circuit, however after making one I realise that oil doesn't conduct electricity, damit! So working on something else.....

02-05-2009 09:51 AM

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MattJen
Elite Veteran
Location: UK

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Bell,

How does an oil light warning system work on a car ?

thanks for the input, the gear box came yesterday, and i have to say it was great to see it all cleaned up and put back together and balanced for me..

Wren even sent me back the bits they replaced, The gear box had done around 220-250 hrs of flying unable to verify that, so a service was well over due, and all that was replaced was 2 bearings and a couple of seals.. a great tesimony to the rotortec gear box..

It has helped me understand more fully what a bad bearing feels like,

I am waiting for the new mast bearings to arrive today, they are are standard large bearings, no self adjusting, and when i removed the main shaft there was no scoring on it to indicate abnormal wear, considering this machine has done the same amount of hours as the gear box i am happy all is well..

Matt

02-05-2009 10:15 AM

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MattJen
Elite Veteran
Location: UK

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When i first got this airframe BellBloke went on about replacing main mast bearings, I did not fully grasp this obsession with bearings he had, although i understood the benefit of ensuring they were kept in good condition due to rf interference they would give out if they were bad.

Well i ordered a set of replacement, even though i did not think i needed them, i spun the shaft and there was no notchyness, but Bell was still insisten i replaced them.

Well yesterday evening i decided to replace them, i took the frames apart, so i could get at the blocks, the shaft comes out so easy, it is just an M5 nut and bolt that holds it together at the bottom, with another one at the top.. no pin,

I took the frames apart, and re plumbed all the tanks with new piping and cleaned out the Oil tank,

I tapped out the bearings, and put them over my fore finger, and spun them individually, they were notchy as hell, i could not understand why they seemed fine in the block..

Hence i replaced them, and put all back together again..

SOmething else i have now been taught which i was never taught before, just because the shaft spins freely on a second hand machine doesnt mean all is well, CHECK, - this machine has done over 200hrs of flying.

so thanks Bell the info has been really helpful.. and i am glad i listened!

Matt

02-08-2009 08:01 PM

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