Gas Turbine streamliner

See cars and bikes being built for the salt

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vetteracer
Posts: 80
Joined: Fri Apr 10, 2009 7:56 pm
Location: KINGAROY QLD AUSTRALIA

Re: Gas Turbine streamliner

Post by vetteracer » Wed Jul 22, 2015 7:17 pm

Mate- this is good stuff. Please keep it coming.
Denis

gidge348
Posts: 127
Joined: Sat Mar 07, 2009 12:50 am

Re: Gas Turbine streamliner

Post by gidge348 » Thu Jul 23, 2015 2:51 pm

Just a bit more info on the engine, a guy I have been talking to in the US has the same type of Nimbus engine in a ROAD REGISTERED Dodge van. He runs is at the drags as well:

https://www.youtube.com/watch?v=BBozXKnSZ6o

The main problem is that it has a habit of vaporising tyres.... :D :D :D
Would make a great burnout car....

My favourite video is : https://www.youtube.com/watch?v=pZ5_nUpOzWA
Where he takes one of his mates for a drive the whole video is good but if you fast forward to 3.50 and Chris does a launch... I think his mate will need a chisel to get the smile off his face... :lol: :lol: :lol:

Cheers
Ian...

gidge348
Posts: 127
Joined: Sat Mar 07, 2009 12:50 am

Re: Gas Turbine streamliner

Post by gidge348 » Mon Jul 27, 2015 12:38 pm

Back to the saga....

Next thing is splining the gear, and picking a steel to make the drive shaft out of. Well this turned out to be an interesting exercise in itself, one thing I found out was that different steels and different hardness's "Don't play well together".

When I destroyed my first FPT shaft I just put it in the lathe and buzzed away so I know it will machine. It is hardened but very lightly. I tested the gear area to be splined with my trusty drill and no problems drills fine.

The only problem is that I do not know the exact chemistry or hardness of the area to be splined. So I thought to be safe I would drop it down to a local lab and they are going to test it. It costs $300 but I feel it will be worth it to make sure I make the shaft of the same materiel and temper.

Ok time to start making something.
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Time to turn big bits of steel into swarf...
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Partly done,
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I don't have an indexing wheel to drill the holes so I went out to see a friend of mine and bludged a favour.

gidge348
Posts: 127
Joined: Sat Mar 07, 2009 12:50 am

Re: Gas Turbine streamliner

Post by gidge348 » Mon Jul 27, 2015 12:40 pm

One last thing I thought I would put the large final drive gear on some scales and see how much weight I am taking out
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17 Kg that will not be spinning around the place. I guess this will mean quicker acceleration, but I will need to fairly spot on with governor to prevent an over speed?

I will be interesting to see what will be the result of all this weight removed?


More later.

Ian.....

gidge348
Posts: 127
Joined: Sat Mar 07, 2009 12:50 am

Re: Gas Turbine streamliner

Post by gidge348 » Thu Jul 30, 2015 11:14 pm

Now it is time to "Get Medieval" on the gearbox.
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Firstly marked up the front of the gearbox for the area to be removed. Note I want to keep the 4 through bolt holes that mount the gearbox to the gas generator (the jet engine part) and the engine mount on the side of the sump area.
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The original length of the gearbox is about 612mm

gidge348
Posts: 127
Joined: Sat Mar 07, 2009 12:50 am

Re: Gas Turbine streamliner

Post by gidge348 » Thu Jul 30, 2015 11:36 pm

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The area delicately removed with a drop saw and an angle grinder....pretty it ain’t

harky
Posts: 163
Joined: Fri Feb 09, 2007 9:03 am
Location: Adelaide

Re: Gas Turbine streamliner

Post by harky » Fri Jul 31, 2015 9:02 am

Oh ---hell
measure twice no three times -----cut once no just measure again ------cut carefully
cause you cant go down the road and get another one -----no no measure again ----have a cup of tea ----then cut !!!!
harky ( who has cut toooooo many things tooooo short !!!!)
harky
DLRA #643
so far 120mph for$2000---imagine how fast I can go for $20,000

gidge348
Posts: 127
Joined: Sat Mar 07, 2009 12:50 am

Re: Gas Turbine streamliner

Post by gidge348 » Fri Jul 31, 2015 3:57 pm

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The “new” gearbox mounted on my jig plate I wanted to buy a piece of 12mm mild steel, but I found a piece of 16mm 350 grade surplus to requirements at a friend’s work (free).
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Don't worry Harkey, all worked out in the end, finished Length 450mm, I was hoping to get down to 435mm but this is close enough.

Next thing is welding the pieces together, I can stick 2 bits of aluminium together with a mig, weather you would call it welding is another story.

I Gave it a go, but looked like the proverbial cockie poo so I got it done professionaly.

Cheers
Ian...

gidge348
Posts: 127
Joined: Sat Mar 07, 2009 12:50 am

Re: Gas Turbine streamliner

Post by gidge348 » Thu Aug 20, 2015 3:18 pm

Ok, got the welded gearbox back an all looks good... no cockie poo.
gearbox_welded.jpg
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Next thing I needed was the new output shaft machined up for gearbox, well a friend of mine has all sorts of CNC stuff so I threatened him with a carton of ted's and hey presto... :)
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Fits on the uni-joint fine
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Now time to get some splines cut

cheers
Ian...

gidge348
Posts: 127
Joined: Sat Mar 07, 2009 12:50 am

Re: Gas Turbine streamliner

Post by gidge348 » Tue Oct 27, 2015 2:14 pm

Oh well it has been a while since I posted but I have been distracted by another project so here goes.

While the new drive shaft was out being splined and heat treated I thought I had better have a look at the rest of the engine.

It had been in storage coated in cosmaline for at least 30 years and possibly longer.

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So I stripped it down and painted the gas generator
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Disassembled all the pumps, regulators etc, and cleaned out all the old fuel scum and replaced the 40 year old rock hard O rings.
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So I ended with 4 tables full of stuff to go back on.
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But it all seemed to find a home without any leftovers
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harky
Posts: 163
Joined: Fri Feb 09, 2007 9:03 am
Location: Adelaide

Re: Gas Turbine streamliner

Post by harky » Tue Oct 27, 2015 9:54 pm

No leftovers is GOOD
ever had that cold sweaty feeling when you have finished an assembly ----- and there is a circlip / ball bearing /or little bit ---- looking @ you ??????
All part of the fun !!!
The cold sweaty feeling -----dont feel nice
harky
harky
DLRA #643
so far 120mph for$2000---imagine how fast I can go for $20,000

gidge348
Posts: 127
Joined: Sat Mar 07, 2009 12:50 am

Re: Gas Turbine streamliner

Post by gidge348 » Wed Oct 28, 2015 2:47 pm

Yep you are right Harky, in my early days I worked out if you pull something apart and put it back together enough times you will have enough bits left over to make another one of what you started of with.... :wink: :wink: :wink:

Later I worked out that is not such a good idea :(

I did have a few "left overs" in things I deliberately took off like I don't think I will need the anti icing out on the lake or outputs for compressed air to run winches or cabin heaters.

Cheers
Ian...

gidge348
Posts: 127
Joined: Sat Mar 07, 2009 12:50 am

Re: Gas Turbine streamliner

Post by gidge348 » Sun Nov 08, 2015 3:29 pm

Ok next instalment of the saga...
Got the splined shaft and gear back started assembling the gearbox.

I still had 2 spacers to make up either side of the thrust bearing, but I want to put it together so I can get some measurements before machining.

The shaft was not heat treated at this stage but the smart man for the heat treaters recommend a 0.1mm nitro carburised case hardening as the actual shaft is almost at the hardness of the gear spline now after all the working so will get that done later.

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I dug all the bearing out, cleaned them up and pressed them in.
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There was no gasket between the faces so I used a black silicon to seal it.

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Now it is starting to look like something.

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cheers Ian...

gidge348
Posts: 127
Joined: Sat Mar 07, 2009 12:50 am

Re: Gas Turbine streamliner

Post by gidge348 » Sat Dec 05, 2015 5:10 pm

Well, it has been a while since I posted but I have been busy,,,, Its hot,,,, I'm lazy..... (Inset excuse here)

Firstly I dropped down the shaft to the heat treater and got it back a few weeks later.

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Now it is time to reassemble the gearbox and power turbine.

A guy with a similar engine in the UK sent through about 500 pages of the Maintenance manual dealing with the gearbox. It gives a very detailed breakdown on the procedure for re-assembly of the gearbox so I have been using that (as much as possible) for the tolerances and the procedure for the reassembly.

A few of the bearings and some clearances are slightly over spec but not by much so I guess I will need to live with that.

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For those not familiar with turbo shaft engines it is basically a jet engine making LOTS of fast moving hot air.

This air is blown over the turbine/fan doo-hickey above that drives the gearbox etc.

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That drives a driveshaft and finally the diff.

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The biggest pain in the butt is setting up the clearances on the turbine

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Because this spins at 35,000 rpm it has tolerances that have to be right within 5 thou of up, down, left, right, twist left/right twist up down and depth in and out. This is all done with shims and a torque wrench. It took best part of a week to get it right but all good now.

Next time the first run of the engine....

Cheers
Ian...

gidge348
Posts: 127
Joined: Sat Mar 07, 2009 12:50 am

Re: Gas Turbine streamliner

Post by gidge348 » Sun Jan 31, 2016 4:54 pm

It's been a while since I loaded any, but the engine is all together and I have been a bit distracted with another project in the shed.

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I have set the engine up in test stand and started it just to make sure all was ok.

https://www.youtube.com/watch?v=8KYToVX6Fpg

I don't have the free-power governor hooked up at the moment so it is idling a bit high at the moment (about 22,000 rpm) should be idling at 16,000rpm but that will all be fixed when I get the drive line & governor in. All went well, the smoke is just burning off some new paint and oil. did have a couple of small oil leaks that needed a bot of fixing, but other than that all fine.

Next thing is the drive line.

Cheers
Ian...

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