SKULD 666

[racket]

Hi Guys

Thought I'd start a Build Thread for the latest engine
.... the SKULD 666

A mixture of Nordic mythology and the occult ................

comprising a mans destiny ,

a 6.66 inch diameter "hole in the front",

and 6.66 lbs/sec mass flow .

Compressor wheel is a titanium billet first stage wheel from a Garrett TPE331 aero turboprop engine .............exducer diameter 9.2 inches with a 0.5 inch tip height , spinning at ~42,000 rpm with a 1,700 ft/sec tip speed for a 4:1 Pressure Ratio .

Turbine wheel is the axial second stage turb wheel of ~8.4 inch diameter.

Engine casing will be 14 inches OD with the engine overall length of ~18 inches .

Work to date ..............a bit of a scuffy plan drawn up on a sheet of cardboard to get the general dimensions of the engine and another for the diffuser layout to make sure flow areas etc won't cause choking .

Diffuser will have 18 wedges , the comp has 17 full length blades

I've just about got the wooden pattern made for the front compressor cover , it just needs its coats of sealing paint applied , will post some pics when painted .................its been a bugger to make as its 14.3 inch diameter is right on the limit of my lathes swing .

Will start on the diffuser pattern latter in the week , once completed I'll send them off for my mate Andrew to check over before getting them cast in alloy and heat treated .

Potential thrust ~400 lbs dry and 550 lbs wet :-)

Cheers
John

[joolsned]

Hi John, Now that is an engine I would like to see running !!!!!

[nersut]

Hi John

That's going to be a monster engine! Cool!
My first thought was, what are you to mount it on??? hehe!

Cheers!
Erik

[pitciblackscotland]

Hi John,
Good one I check the specs on my lathe with the gap remove i can swing 450mm ;D. Had a look at the casing i have Mmmmm might be a wee bit to big .

Cheers,
Mark..

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[racket]

Hi Guys

LOL ....yeh , its gunna be big :-)

Just build the engine, then think about what it can be used for .

Mark , your comp has better inducer tips than the one I have here , this one has fairly "rounded" tips ( wear??) ..................450mm will be heaps big enough , you'll need to make up a big face plate for turning the covers .

Cheers
John

[Johansson]

This will be fun!

[racket]

Heh heh , you guys just wanna see me blow myself up ;-)

[pitciblackscotland]

Hi John,
OK will do i think i have a large steel plate somewhere. This comp wheel has excessive rubbing on the wheel.

Cheers,
Mark.

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[pitciblackscotland]

Pic # 2

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[racket]

Hi Mark

Looks like a bearing may have failed to get that much deflection .

Cheers
John

[stoffe64]

Hello John
This thread i must follow
Where Do you find all the good stuff
Cheers Stephan

[racket]

Hi Stephan

My mate Andrew who is constructing the latest turbine bike sourced the TPE bits I'll use , Mark is very good at finding his bits on Ebay ...............they're out there :-)

Theres a 3rd stage wheel on Ebay at the moment

www.ebay.com/itm/3101660-1-Garrett-TPE-331-Turbine-Wheel-w-Serviceable-tag-/281093102530?pt=Motors_Aviation_Parts_Gear&hash=item4172745bc2&vxp=mtr

but they want too much money for it ...................its only worth scrap value ;-)

Cheers
John

[rythmnbls]

I couldn't resist plugging some numbers for that comp into my spreadsheet, this will be a truly impressive machine, for example at 42000 rpm that comp wheel will need ~780 KW to drive it

I'm grabbing a beer and a bag of popcorn for this one.

Steve.

[racket]

Hi Steve

Yep , the "numbers" get rather high , I'm working on a comp efficiency of 78% which hopefully isn't too optimistic for a large aero comp , so hopeful of only ~730 HP required to drive it .

Cheers
John

[stoffe64]

Hmm,only 730hp,amazing numbers out of a homebuild