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Got Jet Fuel? Turbine Helicopters > Inverted turbine heli
 
 
helifanHeliman - Location: Hamburg / Germany (4 years in L.A., CA, USA) -
I just found a picture of an inverted turbine heli. []

I already saw a turbine heli making a loop and stall turn on the last Hirobo Cup West Coast but not inverted hovering. Guess it's the beginning of 3D flying with turbine helis. []

BTW, the pilot is Harald Bingel who lives in Austria, I think.
05-14-2002 Over year old.
 
 
nexusnz
Senior Heliman
Location: Auckland/Taranaki, New Zealand

Bloody Awesome!
Wouldn't mind seeing one do 3D!

Iain
www.nzhelis.xrs.net
05-20-2002 Over year old.
 
 
Taipan
Key Veteran
Location: Sydney, Australia

Hot stuff! Literally.

I'm all for GT 3D. Although it probably wouldn't be the same as the throttle wouldn't be as responsive.
05-20-2002 Over year old.
 
 
Joel
Senior Heliman
Location: Columbia, MS

I think their at full throttle the whole time.

Joel
05-23-2002 Over year old.
 
 
fitenfyr
rrProfessor
Location: Port Orchard, Washington

Not full throttle.

The turbine controller regulates the fuel to keep a constant RPM on the compressor. SO it is basically like a governer and adjust's the amount of "throttle" to the demand from the main rotor to keep headspeed.

Jason

Jason Stiffey
Fly Fast....Live Slow...
05-25-2002 Over year old.
HOMEPAGE  
 
 
driftrider
Veteran
Location: Cedar Rapids, IA. (In my own little world)

Are the mini-turboshafts in helis single or dual spool engines. If they used a separate gas generator and power turbine the performance would rock. Gas turbines make their best torque at slower speeds so the power turbine wouldn't have to spin very fast either.

I want one...

Mike
05-26-2002 Over year old.
 
 
elad
Senior Heliman
Location: beer sheva (in south) israel

I guess he have a lot extra mony....

05-30-2002 Over year old.
HOMEPAGE  
 
 
Ken B
Elite Veteran
Location: Phoenix, AZ

Driftrider,

I'm sure these engines are single spool centrifugal flow. I can’t imagine what it would cost to have a dual spool axial flow. Way to much $$$

Yes, I can talk Jet engine

Ken B
05-30-2002 Over year old.
HOMEPAGE  
 
 
Phil Cole
Veteran
Location: Redwood City CA

Both single and dual spool model turbines exist.

The Jetcat PHT-3 is single spool, and the Wren MW54 turbo prop has a power turbine, I believe. There are others, but I don't know for sure how they are arranged.
05-30-2002 Over year old.
 
 
ed vega
Key Veteran
Location: nyc, queens

as you already know , this is a breakthrough flight , and that little cone shape after exhaust deflector with brace is interesting .. I like it .. but I would prefer to break the 250+mph barrier with afterburner in a jetheli .. right now it's bvm jets doing it ..
05-30-2002 Over year old.
 
 
Doug
Elite Veteran
Location: Naples Florida....

Most of the designs are direct derivatives of the original Schreckling FD3 home built design. Take a look at this site to see the internals,I built a Phoenix 30.3.
The "direct drive" have a advantage at this scale because of the low pressure ratio of the engines the "free turbine" designs are quite a bit heavier and lack the simplicity of the "belt" drive Jet Cat design.
http://www.gtba.cnuce.cnr.it/NEWS.HTM
05-30-2002 Over year old.
 
 
freestyle
Veteran
Location: Redmond WA USA

the 250mph barrier

Most helis run blade tip speeds around 300 mph. For a heli doing 250mph, the advancing tip will have an airspeed of 550mph (equivalent to 3400rpm in a hover), and the retreating tip will have an airspeed of 50mph (equivalent to 325rpm in a hover).

This presents some interesting problems.

Nate Waddoups
Chronic Thinker
Redmond WA USA
05-30-2002 Over year old.
HOMEPAGE  
 
 
billgraptor30
Heliman
Location: North East, Maryland

I'm glad you said that or I would have had to. Jet Turbines in
a helicopter produces insanely smooth power, and bucketloads of it in a small package. They aren't for thrust. Besides, The thrust would surely put a burnhole in the tail rotor!!
06-04-2002 Over year old.
 
 
jkelly
Veteran
Location: Mobile, AL

the 250mph barrier

...so fly downwind.
06-20-2002 Over year old.
HOMEPAGE  
 
 
midwestpilot
Elite Veteran
Location: Crystal Lake, IL

turbines and 3-d

It is highly unlikely you will see a turbine doing aggressive 3-d...weight factor aside...you have a turbine spinning at 85,000+ rpm....this makes one heck of a gyroscope...(ever do that hold a spinning bike wheel and try to turn it...very hard) the bearings in the turbine would not like the forces applied to them making aggressive maneuvers ..large open loops and rolls sure...tick tocks and piro flips nope not going to happen...

just one guys opinion...oh yea...backed by a factory rep.

In life there is no spacebar!

Rich Erikson AMA 6175
12-18-2002 Over year old.
HOMEPAGE  
 
 
Billme
Key Veteran
Location: MS

Picture looks fake to me ..that 16 ounce tank would not last long at all, besides, it looks like Coolpower fuel

Regards,
Bill
12-18-2002 Over year old.
 
 
flyboy
Elite Veteran
Location: California

Bare foot and pregnant?
12-18-2002 Over year old.
 
 
Vance
Veteran
Location: York ,PA

In a recent article in MHW the author stated that the existing model turbine engines are basically copies of "older" design jet engines that were prone to flameouts if the throttle wasn't handled carefully. Do any of you know if this has proven to be true or does the CPU handle all the throttle duties and we wouldn't have to worry about this?
Thanks
Vince D
12-18-2002 Over year old.
HOMEPAGE  
 
 
ComancheDriver
Senior Heliman
Location: Afghanistan - Operation Enduring Freedom

Turbines

Choosing a turbine? I've heard of the PH-3 evo, the PH-3 and PJ-W from Mr. Peter Jakadofsky, mostly from Europe.
Does anyone know of other turbines available for helo's?


Arkangel
12-19-2002 Over year old.
 
 
Peter Wales
Key Veteran
Location: Orlando Fl

Unfortunately the author of that article did not have any experience of turbines except the monsters powering his 747

The jetcat and the PJ-W turbines have fully automatic throttles. The control you have is the governed speed and in the Jetcat you select that manually, in the PJ-W it is fully automatic. Mine has 2 switches, off/on and idle/full. The Jetcat has just a speed control which you use to ramp up the engine speed, the PJ-W you just switch from idle to full and let it ramp itself up. Once the engines are upto speed the governor locks them there.

There is another engine on the market, the SPS turbine which is a version of the system Dick Wallinger has developed for Midland helicopters. http://www.spsturbines.co.uk/

Dick tells me the SPS is based on one of his early designs and his latest design is much more developed. He is trying to find someone to put it into production for him

Peter Wales
12-19-2002 Over year old.
HOMEPAGE  
 
 
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Got Jet Fuel? Turbine Helicopters > Inverted turbine heli
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