11/127 manned flight engine.

[racket]

Hi Guys

Yep , I've got a system worked out that produces the necessary parts , LOL, quicker than me learning how to organise laser cutting :-)

This will definately be my last engine build , I think I've become allergic to nickel , my health deteriorates as soon as I start working with it , especially grinding turb wheels.

A rainy day coming up , ideal for being in the shed being warmed by the oxy torch .

Cheers
John

[racket]

Hi Guys

Front wall of flametube made

Setting out the hole positions for the 18 injectors , 11 holes per injector , 3 large and 8 small , 198 holes allup , with centre punch in the mill chuck , turn the number of degrees and mark the hole

I left the front wall on the die after rolling the edges , both rolled cold , but the outer edge then heated with the oxy and rerolled , the stainless then contracts when it cools and locks the wall to the die and the "springback" of the rolling is removed so I end up with a better edge .






Then it was time to drill holes, 2 mm cobalt drill to start with , then open up the 18 X 3 hole sets of 4.7mm dia holes , and countersink all 198 holes on both sides ,







Turned out pretty good

Cheers
John

[slittlewing]

A serious amount of drilling and lovely countersink detail. Top notch 👍👍

[racket]

Hi Scott

I always like to take off any sharp edges and leave the holes as they should be, hopefully the rest of the flametube goes as well , really need to start thinking about the NGV so that I can make the rear walls , the side walls will have to wait until I can get an accurate size for the available space between diffuser and NGV .

Cheers
John

[racket]

Hi Guys

Looks like my Chinese comp wheels are finally coming .....they sent a coupla pics today






LOL .......and spinning in the right direction this time

Cheers
John

[wannabebuilderuk]

You just want a really quiet motor to spin them on your desk as you think ha

[jetjeff]

Hi John,

Looks great. In the first pic, what is the smaller hole in the 11:30ish position from the central hole for?  Balancing?

Regards

Jeff

[dieselguy86]

Jeff, I can't 100% for sure say what THAT hole is for, but I've seen other wheels where they drilled and filled with metal for balancing.

[racket]

Hi Jeff

Don't really know , maybe some sort of locking device for the comp in its original use , I haven't the faintest idea what the wheel is out of , it was just a "Part Number" in their list of wheels they make , it was the right size so went with it .

Some sort of "heavy duty" turbo use I feel .

Cheers
John

[dieselguy86]

John,

Now that you say that, the tractor pullers here use 2 holes and dowels in the comp nut. Apparently they are spinning comps on the shaft, they first tried keying the comp to the shaft, but it required alot of balancing to correct. So they settled on the dowel pin idea.

[racket]

Hi Joe

The wheel in its original design came with a 16.5 mm bore , I got them to modify it to 12.71mm to fit the TF15 turb quill , the larger shaft may have had some sort of "fixture??"

The ALCO locomotive rotative I have has a pin into the comp snout that goes into a ~1/2" thick washer under the nut , the "washer" is keyed to the ~1.25" dia shaft

Cheers
John

[pitciblackscotland]

Jun 7, 2021 0:31:53 GMT -5 racket said:

Hi Joe

The wheel in its original design came with a 16.5 mm bore , I got them to modify it to 12.71mm to fit the TF15 turb quill , the larger shaft may have had some sort of "fixture??"

The ALCO locomotive rotative I have has a pin into the comp snout that goes into a ~1/2" thick washer under the nut , the "washer" is keyed to the ~1.25" dia shaft

Cheers
John

Hi John,
Some of the comp wheels i have do have holes as well.

Cheers,
Mark.

[racket]

Hi Mark

Yeh , a bit more positive location is required on "industrial" units compared to the "simple" automotive turbo .

Now if only we could find a use for those big comps ;-)

Cheers
John

[racket]

Hi Guys

Chinese comp wheels have arrived in Oz , cleared customs , so should have them "in the hand" this week :-)

Cheers
John

[racket]

Hi Guys

LOL.......need I say more, one happy "ol' fart"








Compared with the "lightweight" KTS wheel



Nice big 1/2" exducer tip height

Time to do some calcs

Cheers
John