"Fat Boy" 12/118 thrust engine

[turboron]

John, truly amazing sheet metal work. Do you use gas welding for all your welds?

Thanks, Ron

[racket]

Hi Ron

TIG only on this one

Cheers
John

[Deleted]

Hi John, looking real good, coming together, soon be making some real HP

Chat soon

All The Best

Andy

[pitciblackscotland]

Hi John,

Very nice work you have done, weighing up to 7 kgs. getting to be heavy duty

Cheers,
Mark.

[racket]

Hi Mark

Yep , with a 9 inch dia freepower wheel things get rather large and unfortunately heavy :-(

Cheers
John

[racket]

Hi Guys

Scroll finished, ..............why is it that some welds go nicely and others are fair mongrels to do with blown holes everywhere ...........ah well , it'll do for a test piece .

A few pics with the 2 foot torque arm attached and wheel mounted up.














Time to get some steel and modify the test stand to mount it on , thankfully the jetpipe slipjoint is still "slipping" even if a bit tight from some warpage , the first heat cycle should relax things a bit , the turb wheel still spins thankfully :-)

Cheers
John

[Deleted]

Wow, now this looks epic, came togethere real nice, is that chain going to take it i think spring scales, going to come apart......

Looking good John

Chat Soon

[racket]

Hi Andy

LOL, thats why I went to a 2 foot arm to "halve" the foot pounds of torque , the 25 kg spring balance should do the job, only ~20 kgs in my wildest dreams ;-)

I'll have a "safety chain" as well as the spring balance just in case .

Yep, its not looking too bad as long as the welds aren't examined too closely , just hope it doesn't put too much backpressure on the gas producer , I guess it'll be fairly obvious as soon as she fires up and those interstage temps go off the scale.

Spent the afternoon cleaning up the workshop , lotsa cardboard scraps everywhere , tools all over the place , but it had to be done before starting the next phase .

Cheers
John

[turboron]

John, good laugh about your shop cleaning and straightening. When I was a kid I always wondered why the mechanic's shop was so cluttered. Now I know. The choice is between accomplishing something or having a clean organized shop. When it gets so bad I get embarrassed and then I start cleaning and straightening.

Thanks, Ron

[enginewhisperer]

that looks excellent

Stainless can certainly be a bit of a pain to weld. It helps to back purge it all with argon, but it's tricky on a part like that and uses a lot of gas.


Will you pipe fresh air into the gap on the other side of the "screw" panel to help cool the bearing tunnel?

[racket]

Hi Andrew

I'll make up a thermal shield using some ceramic blanket to keep the shaft tunnel and gearbox safe from radiant heat , and theres some bleed air being fed into the gap between wheel and scroll flange/shaft tunnel to help keep temps down there.

Hopefully all will be OK when its finished :-)

Cheers
John

[racket]

Hi Guys

Got the freepower stage "mounted" up behind the gas producer ............she's getting to be a big lump of a beasty :-)

LOL.......A bit of angle iron here and there to replace my wooden bits and it'll be done......easy .







Cheers
John

[turboron]

John, what is your planned test program. Stall torque? Stage matching?

Thanks, Ron

[racket]

Hi Ron

It'll be a pretty short test program , just fire her up and try to get to full throttle without the temps getting too high , if I can keep the temps similar to what I had with the jet nozzle fitted I'll be more than satisfied.

The stalled torque readings will give a good indication of potential horsepower output and as long as it indicates >200 HP , my job is finished , not before time as my health is suffering from the extended build time , .......gotta lower my stress levels :-(

Cheers
John

[turboron]

John, please lower your stress levels. Health is the only thing that matters.

Thanks, Ron