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Got Jet Fuel? Turbine Helicopters > Coaxial KA-50 Turbine
 
 
human213
Senior Heliman
Location: malibu

The Jung Modelltechnik booth at the JetPower show...

...a few shots of the ka-52, kamax mechanics, and my ka-52
pod and boom at the show...


michael

10-14-2007 08:14 AM
 
 
trashmanf
Heliman
Location: Kent, WA

very impressive, can't wait to see a shot of the finished scale build those kids give a great scale to the size of this thing!
10-15-2007 05:53 PM
 
 
fredd
Senior Heliman
Location: UK - London

Human123, have you seen the Coaxial fly on a benzin engine ? Dod it shake like crazy or at a reasonable level. I haven't yet seen a heli fly with the large benzin 62 engine. It makes the whole package somewhat more affordable...
10-16-2007 09:54 AM
 
 
Coolrunnin
Veteran
Location: Manchester U.K.

Fredd - Nico has a slightly older video of the Benzin co-axial machine flying very well on his helicrazy site, somewhere in the Videos section. It's worth a watch for sure.

Human - Thanks for posting those photos, looks like a great static display. I like the Wessex HC.2 fuselage very much too!
10-16-2007 11:16 AM
 
 
FCM
Elite Veteran
Location: Back in Blighty!

Quote 
Dod it shake like crazy or at a reasonable level.
Yes it does unfortunately. You can see a video on Volker's web site and the tail is buzzing merrily away. The Turbine powered version is so much smoother. This is not the fault of the heli. Getting a single cylinder engine of that capacity to run smoothly is a real challenge.

Paul.
10-16-2007 02:05 PM
 
 
fredd
Senior Heliman
Location: UK - London

Electric could also be an interesting alternative but would require a clutch with 6 BIG blades to spool up.
10-17-2007 03:24 PM
 
 
human213
Senior Heliman
Location: malibu

JetPower 07




Left to right:

The new 12 kW capable Jakadofsky turboshaft. This is an amazing piece of engineering, (usual Jakadofsky uncompromised quality...) with twice the power plus, and the SAME fuel consumption as the smaller engine! Originally APU developed, the unit has, as in full scale, it's own radiator cooled recirculating
closed loop oil system, with over a 400 percent increase in engine
service intervals! Note the trick enclosure of the engine starting motor in the clutch output bearing housing, thus, the intake is now free of the motor obstruction...



...next, the new 3 meter cobra, this one at the Jakadofsky stand....

...cobra rotor head...note the beefcake linkages....

...Scalecopter, the full size machine flies in malibu...

...my coaxial pod and boom for the ka52...



best,


michael
10-21-2007 01:25 AM
 
 
FCM
Elite Veteran
Location: Back in Blighty!

Quote 
I will be utilizing this engine in my new ka 52 and 3 meter cobra.

That's an interesting engine Michael but why would you want to use it instead of say a 2 stage Jetcat?

Thanks for posting the pics by the way

Paul.
10-21-2007 02:19 AM
 
 
human213
Senior Heliman
Location: malibu

Power...

too much is never enough, and the three meter class

is a much larger and heavier machine....( up to 25 kilos plus....)

I like maintaining the same or a higher power to weight ratio....


michael

Not everything that can be counted counts, and not everything that counts can be counted.
10-21-2007 02:30 AM
 
 
chopper jockey
Senior Heliman
Location: uk

It's a shame they don't do it properly and create a two stage version.
10-21-2007 01:37 PM
HOMEPAGE  
 
 
Coolrunnin
Veteran
Location: Manchester U.K.

What would be great for these larger engines is to go a little further and build a 2-stage engine but with concentric shafts and a front power take-off through an epicyclic gearbox instead of a clutch...
10-22-2007 10:57 AM
 
 
chopper jockey
Senior Heliman
Location: uk

you can get them now..... a chinook APU
10-22-2007 11:26 AM
HOMEPAGE  
 
 
SSN Pru
Elite Veteran
Location: Massachusetts

Quote 
What would be great for these larger engines is to go a little further and build a 2-stage engine but with concentric shafts and a front power take-off through an epicyclic gearbox instead of a clutch...

Wow, id like to see the pricetag on that one for a model...

If you avoid failure, you also avoid success.
10-22-2007 01:31 PM
 
 
Coolrunnin
Veteran
Location: Manchester U.K.

Quote 
you can get them now..... a chinook APU

Now there's a plan!

I guess the only limitation is how big you can go until the model legally becomes a full-size aircraft and has to go through proper type certification?

Quote 
Wow, id like to see the pricetag on that one for a model...

Same here!
10-22-2007 02:52 PM
 
 
human213
Senior Heliman
Location: malibu

Again, look at the fuel

consumption, and the kW output...



this is a cutting edge piece of engineering, at a bargain price


for the level of specs documented...it is designed for extremely long


service intervals...




best,


michael

Not everything that can be counted counts, and not everything that counts can be counted.
10-24-2007 10:44 AM
 
 
chopper jockey
Senior Heliman
Location: uk

Quote 
Again, look at the fuel

consumption, and the kW output...

Well I'm looking...


In one of the pics it says verbrauch 170ml/min ?

that's 1.7 ltrs per 10 mins

OK If that's at full power, then it's very good for a single stage.

Is it a gas gererator?

and according to the pic, it's 10.6 kw, not 12.



10-24-2007 01:15 PM
HOMEPAGE  
 
 
FCM
Elite Veteran
Location: Back in Blighty!

Quote 
closed loop oil system, with over a 400 percent increase in engine
service intervals!

Mike, is that with the 'normal' total loss oil system or as an APU with a closed loop system?

As it is a single shaft engine you will still have some significant residual thrust from the exhaust I assume?

Paul.
10-24-2007 02:03 PM
 
 
chopper jockey
Senior Heliman
Location: uk

Another question, it has no starter bullet on the front, how does it start? through the clutch shaft perhaps?
10-24-2007 04:05 PM
HOMEPAGE  
 
 
SSN Pru
Elite Veteran
Location: Massachusetts

Quote 
Another question, it has no starter bullet on the front, how does it start? through the clutch shaft perhaps?

Human123 already has answered. Apparently it starts via the clutch shaft.


Human123 wrote:
Quote 
Note the trick enclosure of the engine starting motor in the clutch output bearing housing, thus, the intake is now free of the motor obstruction...

If you avoid failure, you also avoid success.
10-24-2007 06:13 PM
 
 
G-SWSMHeliman - Location: Midlands, UK -
Hi All,

Just a quick question if I may.

All of these photographs look extreemley impressive.

But, What are the fuel tanks made ofin the shots with the contra head model with the carbon canopy.

and how much fuel do they hold.

Thanks.

Ps, Where did you get them from.

Thanks.

Steve.W Remember, under no circumstances take a laxative and a sleeping pill on the same night
10-24-2007 09:40 PM
 
 
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Got Jet Fuel? Turbine Helicopters > Coaxial KA-50 Turbine
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