Yili Casting Model Jet Engine Turbine Wheels

[donagin]

Hello all,

A couple of years ago, I ordered Yili Casting's Model Jet turbine wheels.  I have the J84, the J66, and the J50.  Since it seems that others might be interested in what these look like, I am posting relatively detailed pictures.

First, the three sets (front and back) along with the NGV's.





Now, Pics of each unit - starting with the J84.





And the J66:





And finally, the J50;





I hope these pics may be useful to others at some time.

-Don

[madrocketscientist]

Don,

Do you have any CAD drawings for these?

Shannon

[donagin]

Unfortunately I do not.

-Don

[donagin]

Oh, yes.  I wanted to add that payment was made by credit card through Paypal.  Shipping was via air carrier, and was reasonable.  I don't remember the exact amount and can't find the invoice, but it was in the $30-$50 range.  It took about a month from placing the order to get it.  The three sets cost around $180 for the 50 mm, $280 for the 66 mm, and $480 for the 84 mm.  I was going to try to put the three sets together as a triple stage turbine, but concluded that this was not going to work.  I haven't done anything with them since.

-Don

[madrocketscientist]

It really does seem like the 84mm set is a copy of the AMT Olympus, as someone mentioned in another thread.

There is a section view in the pdf here:
www.amtjets.com/pdf/University-Olympus-HP-Jan-2017.pdf

Comparing the Yili 84mm turbine wheel to the Jetmax 85mm turbine wheel, the Yili wheel seems to have a larger hub with shorter blades. 60mm hub versus the 55mm hub on the Jetmax wheel, The price for the Yili set is a little over half the price of the Jetmax set also.

Shannon

[donagin]

Hi. 

I went and measured and drew the 84 mm wheel on Autodesk Inventor.  Using the 440C stainless as the material, Inventor estimated 190 grams.  My wheel is 194 grams on the scale, so I'm pretty close.  Take all the dimensions with a grain of salt, as my metric caliper is dead, so all measurements were in inches, and then converted by the program.  Also, the vanes are simply eyeballed as to their profile.  Its a free measurement, and worth every penny!



-Don

[jetjeff]

Hi Don,

Nice turbines / NGV's. I'm not sure if you've settled on an axial turbine, but the 84 mm one seems promising.

Then again, I think you mentioned a possibility of powering an airplane, then 84 mm would be too small.

Regards

Jeff

[donagin]

My current plans is radial inflow turbine off of an HX35W. I think the 84 mm wheel is quite a bit too small for a freepower turbine on a 50-60 lbm/min engine. I've been looking at an Allison 2nd stage turbine, but it seems like it may be a bit too big. This is not necessarily in terms of flow size, but quite possibly in terms of physical size. Not sure of anything cheap that is in between...

-Don

[racket]

Hi Don

The second stage C20 wheel is too large in diameter for the average turbo compressor wheel , though there are centrifugal supercharger wheels with low Trims that could be suitable , they use low Trim wheels to reduce the rpm to make gearing easier . .............KTS do some such wheels www.ktsturbobilletx.com/index.php though rotation direction would need to be checked.

The Allison wheel would be a good freepower though for your needs .

Cheers
John

[madrocketscientist]

Nov 18, 2017 7:01:44 GMT -5 jetjeff said:

Hi Don,

Nice turbines / NGV's. I'm not sure if you've settled on an axial turbine, but the 84 mm one seems promising.

Then again, I think you mentioned a possibility of powering an airplane, then 84 mm would be too small.

Regards

Jeff

Two of them would power a small aircraft quite well though

Shannon

[donagin]

Hi again.  I decided to try my hand at drawing the NGV for the 84.  Pay no attention to the vanes - I would have to cut them to get accurate results.  Otherwise, the drawing is fairly accurate.  I forgot to note on the drawing that there are 22 blades.



These dimensions are meant as guidelines for planning only, and are quick and dirty in nature. Don't machine parts based on them!

-Don

[madrocketscientist]

Thanks again Don!

I think I will order a couple of these and base some engines on them.

Shannon

[madrocketscientist]

I 'had' ordered two sets of 84mm turbine wheels and NGV's from Yili, however I just got an email saying the prices had increased quite substantially and I needed to pay more to buy both sets. I do have the option of canceling the order and getting a refund.

Has anyone had this happen to them when buying from Yili?

Shannon.

[BFTO]

Nov 24, 2017 4:58:19 GMT -5 madrocketscientist said:

I 'had' ordered two sets of 84mm turbine wheels and NGV's from Yili, however I just got an email saying the prices had increased quite substantially and I needed to pay more to buy both sets. I do have the option of canceling the order and getting a refund.

Has anyone had this happen to them when buying from Yili?

Shannon.

How much have they increased the price? Price for nickel have increased by 30% in five months but the price for the raw material is probably low compare to the processing cost.

[madrocketscientist]

Its gone up 30% since I was quoted and paid a week ago! Although on checking the numbers the cost is now $489 USD a set, so fairly close to what is quoted earlier in the thread (assuming the prices are also in USD). Still a bit cheeky and not very good business practice.

Shsnnon.