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HomeTurbineAircraftHelicopterTurbine Helicopters › Jet Cat Turbine Layouts & Run Up Photos
04-07-2010 04:04 AM  8 years agoPost 1
maxturbine

rrApprentice

Snohomish,WA

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I just wanted to share my turbines that I finished up this week. The first unit is an older Jet Cat that I converted to 6mm/9mm belts, gears and sides frames. The second unit is a for my Vario cobra which will spin a 4 blade 2MM disk with the dual gears. It is modeled after the 249 version which was the test bed for the 412.

Jet Cat Germany and USA helped me on the conversions parts and sub assemblies. The service turnaround times where within weeks for both locations.

Each have identical set ups with V-Bars, Vario Rotor components and Scott Gray Reactors. Scott made me 4 point CCPM reactors.

The cobra mechanics can be installed as one unit with four bolts to the body. Everything is contained in one unit.

Maybe this will give you some ideas for your set up.

Ralph

Electronics

Side view

Rear View

Pod & Boom Layout

Pod & Boom top view

Cobra Top View

Cobra Side View

Fuel plumbing layout

Flame out of right stack- Need to reduce pump voltage

Runnning smooth with turbine at 56,000 RPM

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04-07-2010 04:21 AM  8 years agoPost 2
PETER ROB

rrElite Veteran

Devon UK

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Easy fit mechanics
Ralph, Looks good, I built one of the early Vario Cobra's, before the wrap around fuel tank was available, have you allowed enough room to fit the cockpit?
You have not fitted the exhaust to the Cobra mechanics, will the exhaust come out at the same time as the mechanics?,if not it is a nightmare to get to the exhaust retaining bolts
A tip I stole from one of Modtrons EC135's was to fit captive nuts into the 4 fixing holes in the base angles, this allows for the 4 bolts to be fitted from the outside, through the skids, into the captive nuts, it will make fitting and removal very easy
Peter R

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04-07-2010 04:56 AM  8 years agoPost 3
maxturbine

rrApprentice

Snohomish,WA

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The exhaust is held on with 3 screws which have access from the sides and bottom. It must be removed before I can slide the mechanics out. This was made by Tam at is triple wall at the back and double on the center section. The outside is dead cold during run up.

The cockpit clips into the inside of the body on rails I made. It just sit over the electronics. I put servos in the pilots body’s and the heads move with the rudder and cannon. This was somewhat fun to do. I have seen many of your models and appreciate the questions.

Excellent point on the mounting. I will do that since it is a nightmare to acces the front ones.

Thanks Ralph

Exhaust Mounting Points

Exhaust Back End

Cockpit

Mechanics in the Body

Not much room!!!!!

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04-07-2010 05:08 AM  8 years agoPost 4
Rappy 60

rrVeteran

Paris, France

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From that exhaust setup, how do you stop the thrust from the engine propelling you forward, or am I missing something?

Dale

Load "*",8,1

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04-07-2010 05:11 AM  8 years agoPost 5
maxturbine

rrApprentice

Snohomish,WA

My Posts: All  Forum  Topic

It is set up to thrust upward 15 Degrees which is in the rotor wash.

Should be ok based on other ships that have flown in the past.

Ralph

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04-07-2010 05:38 AM  8 years agoPost 6
PETER ROB

rrElite Veteran

Devon UK

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Cobra exhaust thrust
Dale, This is the Vario exhaust in my Cobra, to scale, with Zero forwards thrust, but still sat slightly tail down, probably because of the downwards pressure from the Exhaust gasses against the blades
Look carefully and you can just see the covers I had to make for my own internal tanks
Peter R

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04-07-2010 08:29 PM  8 years agoPost 7
Rappy 60

rrVeteran

Paris, France

My Posts: All  Forum  Topic

It is set up to thrust upward 15 Degrees which is in the rotor wash.

Should be ok based on other ships that have flown in the past.
Kind of hard to see from the photos, looks like one of those jet engine funny car exhausts Nice work on the exhaust by the way, really like it!
Dale, This is the Vario exhaust in my Cobra, to scale, with Zero forwards thrust, but still sat slightly tail down, probably because of the downwards pressure from the Exhaust gasses against the blades
Look carefully and you can just see the covers I had to make for my own internal tanks
Peter R
Nice Cobra, what size blades are you running on that thing?

Dale

Load "*",8,1

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04-15-2010 04:42 AM  8 years agoPost 8
maxturbine

rrApprentice

Snohomish,WA

My Posts: All  Forum  Topic

Photo's of the run up. All very smooth after the change out.

Ralph

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