How its made, Model turbine engine
09-08-2011, 09:07 AM
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RE: How its made, Model turbine engine
Excellent find, terminology is interesting, personal favourite is, threaded slot 
Details of the balancing will confirm to some why there are grinding marks on the compressor wheel, that was discussed in another thread.
Details of the balancing will confirm to some why there are grinding marks on the compressor wheel, that was discussed in another thread.
09-08-2011, 09:17 AM
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RE: How its made, Model turbine engine
There is also a video there on the manufacture of a BVM Ultra Bandit.
There is something wrong with the sound, but it can be heard faintly if you turn everything up full
http://www.youtube.com/watch?v=DVfUiR2WZWw&NR=1
There is something wrong with the sound, but it can be heard faintly if you turn everything up full
http://www.youtube.com/watch?v=DVfUiR2WZWw&NR=1
09-08-2011, 10:06 AM
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RE: How its made, Model turbine engine
ORIGINAL: AndyAndrews
What is the big difference you mention though? Don't most do it basically the same way?
What is the big difference you mention though? Don't most do it basically the same way?
Excellent find, terminology is interesting,
http://www.youtube.com/watch?v=ykpVsGYSi9E
09-08-2011, 10:57 AM
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RE: How its made, Model turbine engine
You will find in most turbines the case is what holds the NGV (stator plate in video) in the correct place so normally needs to be fitted before turbine itself.
This as well also allows bearing change with minimal stripping
This as well also allows bearing change with minimal stripping
09-08-2011, 04:21 PM
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RE: How its made, Model turbine engine
This short clip was pretty amazing. Too bad the turbine manufacturers don't make an informative DVD like this and package it with every turbine they sell. It would give you an Idea of what makes your engine do what it does. A short clip on setting fail safe, ecu operation and which way to orient fuel lines (follow the arrows) etc for those visual learners would complete the DVD. Just a stray rambling...............
09-08-2011, 05:06 PM
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RE: How its made, Model turbine engine
ORIGINAL: KXH121
This short clip was pretty amazing. Too bad the turbine manufacturers don't make an informative DVD like this and package it with every turbine they sell. It would give you an Idea of what makes your engine do what it does. A short clip on setting fail safe, ecu operation and which way to orient fuel lines (follow the arrows) etc for those visual learners would complete the DVD. Just a stray rambling...............
This short clip was pretty amazing. Too bad the turbine manufacturers don't make an informative DVD like this and package it with every turbine they sell. It would give you an Idea of what makes your engine do what it does. A short clip on setting fail safe, ecu operation and which way to orient fuel lines (follow the arrows) etc for those visual learners would complete the DVD. Just a stray rambling...............
09-08-2011, 05:31 PM
#14
RE: How its made, Model turbine engine
ORIGINAL: Xairflyer
I believe this is what Hobbyking are planning to do with their new turbine.
ORIGINAL: KXH121
This short clip was pretty amazing. Too bad the turbine manufacturers don't make an informative DVD like this and package it with every turbine they sell. It would give you an Idea of what makes your engine do what it does. A short clip on setting fail safe, ecu operation and which way to orient fuel lines (follow the arrows) etc for those visual learners would complete the DVD. Just a stray rambling...............
This short clip was pretty amazing. Too bad the turbine manufacturers don't make an informative DVD like this and package it with every turbine they sell. It would give you an Idea of what makes your engine do what it does. A short clip on setting fail safe, ecu operation and which way to orient fuel lines (follow the arrows) etc for those visual learners would complete the DVD. Just a stray rambling...............
6 hours to manufacture @ $1.00 per hour (China's industrialized city average rate) brings the labor to $6.00... They already manufacture turbine components in China for the Germans. Yep, estimate a street price of less than $1500:-)
Gerry
(wishing out loud)
09-08-2011, 05:42 PM
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RE: How its made, Model turbine engine
Once again guys. If your only going to sell 500 of them you cant get by making 20% profit on one. They also left out the pesky part about turning, grinding and treating the shaft, casting and working the NGV and wheel and CNCing the compressor. THere is also the part that is always left out called R&DOh yeah I forgot the chinese dont bother doing that part themselves. Scotty
09-08-2011, 06:59 PM
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RE: How its made, Model turbine engine
Anyone bought a multi axis CNC machine lately? Anyone undergone the training and experience required to accurately and efficiently operate one? It's a real serious investment. Then we have product liability insurance, which is something a reputable turbine shop will have to play CYA after a consumer does something stupid. Of course Hobby King, being remote in China, will likely circumvent that part of the consumer responsibility process.
09-09-2011, 09:40 AM
#19
RE: How its made, Model turbine engine
From what I can imagine the materials and labor should be @ $150
Sell a $2000 engine, deduct labor and materials of $150
Enjoy a profit of $1850 and take the rest of the week off.
Whan a $3600 engine is sold, then it's a party added to the week off.
But those CNC and router machines cost a bunch.
Sell a $2000 engine, deduct labor and materials of $150
Enjoy a profit of $1850 and take the rest of the week off.
Whan a $3600 engine is sold, then it's a party added to the week off.
But those CNC and router machines cost a bunch.
09-09-2011, 12:58 PM
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RE: How its made, Model turbine engine
Just wanted to chime in here. The metals are the most expensive part of the turbine. I would think that the turbine side is using either inconnel or monel for the hot section and either aluminum or stainless for the compressor section.
The machining of these parts is tricky as well and more than likely done on a CNC machine with multi axis. Once programmed correctly the parts can be milled in a few hours.
A jet engine as simple as it seems is a very complex mechanism and with the RPM's they turn must be robust enough to handle the stress not only from heat but from vibration and centrifugal force. If inferior metals are used in it's construction the compressor side and turbine side are susceptible to creep. Basically what this does, is the blades tend to grow and will eventually contact the turbine or compressor case internally and will FOD the engine.
I don't know what China is using in their engines nor do I know what jetcat and others use. However the guys that have been around for awhile have a pretty decent track record. The jury is still out on the China product.
Profit aside for what the modeler is getting for around 2k to 5k is a bargain when it comes to model turbines.
On a business jet or airliner the minimum cost of 1 engine brand new is around $750,000 (Small turbine) and the last time I had to purchase an engine,a (CF-34 engine same one on the A-10 tank killer) that goes on a business jet (Challenger 601-605 models) cost around 2.5 million per side and cost anywhere from 250,000 to 1.2 million to overhaul.
Regards
Glenn Williams
The machining of these parts is tricky as well and more than likely done on a CNC machine with multi axis. Once programmed correctly the parts can be milled in a few hours.
A jet engine as simple as it seems is a very complex mechanism and with the RPM's they turn must be robust enough to handle the stress not only from heat but from vibration and centrifugal force. If inferior metals are used in it's construction the compressor side and turbine side are susceptible to creep. Basically what this does, is the blades tend to grow and will eventually contact the turbine or compressor case internally and will FOD the engine.
I don't know what China is using in their engines nor do I know what jetcat and others use. However the guys that have been around for awhile have a pretty decent track record. The jury is still out on the China product.
Profit aside for what the modeler is getting for around 2k to 5k is a bargain when it comes to model turbines.
On a business jet or airliner the minimum cost of 1 engine brand new is around $750,000 (Small turbine) and the last time I had to purchase an engine,a (CF-34 engine same one on the A-10 tank killer) that goes on a business jet (Challenger 601-605 models) cost around 2.5 million per side and cost anywhere from 250,000 to 1.2 million to overhaul.
Regards
Glenn Williams