"Fat Boy" 12/118 thrust engine

[racket]

Thanks Anders :-)

Got some plumbing into the rear of the cone , 3/8" OD stainless outer tube mounted into a cover flange , with a 3/16" OD inner steel tube for the air , hopefully it'll keep the supply air from getting too hot , theres a ~2.5mm dia "jet" that squirts air at the turb wheel hub , considering my terrible TIG welding abilities its turned out reasonably OK with not too many "holes" blown in the sheeting

Cheers
John

[racket]

Hi Guys

Freepower stage finished and all together , have left final pop riveting of the exhaust for ease of handling/installing , just need a 1/4" bleed air from the gas producer to supply air to cool the freepower wheel/bearing, 50cc of gear oil added to "wet" the teeth , and another spring added to the wastegate to make opening operation more positive .

A few pics










She's a bit of a "lump" at ~23 inches overall , but could be shortened if the 10" of exhaust pipe is removed, the gearbox is rather overshadowed by the scroll size .

Cheers
John

[turboron]

John, you need a bronze placard that reads "This equipment is not intended for aircraft propulsion" similar to one I saw on a 1920's large steam turbine generator.

Thanks, Ron

[racket]

Hi Guys

Started to mount the gas producer and freepower/trans onto a 40 mm square section frame , 700 mm long X 300 wide , for easier mounting into a "chassis" , still undecided whats the most appropriate "device" to use for it to get mobile , she's getting a bit "large"

I need to make up a 30 mm steel packer to fit under the gearbox , it'll be welded to the frame and securing bolts fitted up through them and into the gearbox , once thats all in place and orientated true to the frame I can start positioning the gas producer , I've got the chain block suspended from a shed roofing beam as a "sky hook" to make the job easier .





Cheers
John

[racket]

Hi Guys

Ever had one of those days when nothing goes right..............went to buy some steel for the gearbox packer , they didn't have anything thick enough so settled for a 20mm and a 12 mm chunk of plate 100 X 180 mm to get my thickness , the guy cuts the 12 mm OK , but then cuts a 16mm section instead of the 20mm , when I pointed out that 12 + 16 only makes 28 he seemed surprised , but cut me the right piece without throwing a tantrum .........going good here I thought ,......... until he cuts the 25 X 10 mm piece of flat , which looked a tad skinny as he was cutting it in the saw and which on measuring turned out to be only 8mm , so another length of flat removed from the rack and cut , though by this time his "emotions" were becoming obvious, thankfully that was all I needed so paid up and retreated :-)

Then I went looking for some cap screws, 10 and 12 mm , to secure the gearbox , my usual supplier only had coarse thread metric screws , bummer , so off on a 20 minute drive to a specialist fastener shop , they didn't have them either , a third establishment tried but still no luck , on the fourth try they at least had the 10 X 1.25 screws but not in the length I wanted , so settled for a bit longer thinking I could cut off the excess , but on getting them home found the shank was too long , will return them and use slightly short screws instead .

The 12 X 1.5 X 70mm cap screws I've just purchased on Ebay from the comfort of my home .................and the shops wonder why people are deserting them and shopping online.................at last something went right :-)

Cheers
John

[azwood]

Jan 27, 2020 23:43:14 GMT -5 racket said:

Hi Guys

Ever had one of those days when nothing goes right..............went to buy some steel for the gearbox packer , they didn't have anything thick enough so settled for a 20mm and a 12 mm chunk of plate 100 X 180 mm to get my thickness , the guy cuts the 12 mm OK , but then cuts a 16mm section instead of the 20mm , when I pointed out that 12 + 16 only makes 28 he seemed surprised , but cut me the right piece without throwing a tantrum .........going good here I thought ,......... until he cuts the 25 X 10 mm piece of flat , which looked a tad skinny as he was cutting it in the saw and which on measuring turned out to be only 8mm , so another length of flat removed from the rack and cut , though by this time his "emotions" were becoming obvious, thankfully that was all I needed so paid up and retreated :-)

Then I went looking for some cap screws, 10 and 12 mm , to secure the gearbox , my usual supplier only had coarse thread metric screws , bummer , so off on a 20 minute drive to a specialist fastener shop , they didn't have them either , a third establishment tried but still no luck , on the fourth try they at least had the 10 X 1.25 screws but not in the length I wanted , so settled for a bit longer thinking I could cut off the excess , but on getting them home found the shank was too long , will return them and use slightly short screws instead .

The 12 X 1.5 X 70mm cap screws I've just purchased on Ebay from the comfort of my home .................and the shops wonder why people are deserting them and shopping online.................at last something went right :-)

Cheers
John

Working in the steel trade for many years it blows me away that some guys can't tell the difference between say 8 and 10mm plate or 40 and 50mm pipe and most can't sharpen a drill bit true tradesmen are a dieing breed.

[pitciblackscotland]

Hi John,
Yeah i had plenty of those days, i look online first and see if i can get the parts i need and also if they are local ring them first before I visit them. I go to Bayswater bolts for just about all my Fasteners and visit my local scrappy about 3 times a week.

Cheers,
Mark.

[azwood]

Jan 28, 2020 0:05:54 GMT -5 pitciblackscotland said:

Hi John,
Yeah i had plenty of those days, i look online first and see if i can get the parts i need and also if they are local ring them first before I visit them. I go to Bayswater bolts for just about all my Fasteners and visit my local scrappy about 3 times a week.

Cheers,
Mark.

Yep I go to Bayswater bolts it's an hour drive for me but

[azwood]

Jan 28, 2020 0:17:50 GMT -5 azwood said:

Jan 28, 2020 0:05:54 GMT -5 pitciblackscotland said:

Hi John,
Yeah i had plenty of those days, i look online first and see if i can get the parts i need and also if they are local ring them first before I visit them. I go to Bayswater bolts for just about all my Fasteners and visit my local scrappy about 3 times a week.

Cheers,
Mark.

Yep I go to Bayswater bolts it's an hour drive for me but

Pertec just up from them are helpful to

[pitciblackscotland]

I used to go to cost less bolts ringwood they are not as good as Bayswater bolts also go to A&A Industrial Supplies there not bad. I go to Pertec somtimes, but go to enzed as i got to know the guys and they let me do testing of my turbine projects at they premises.

[azwood]

Jan 28, 2020 0:27:22 GMT -5 pitciblackscotland said:

I used to go to cost less bolts ringwood they are not as good as Bayswater bolts also go to A&A Industrial Supplies there not bad. I go to Pertec somtimes, but go to enzed as i got to know the guys and they let me do testing of my turbine projects at they premises.

I find when you build a relationship with a business they tend to look after you most people think I'm full of crap when I say it's for a gas turbine engine most times I don't say what it's for haha they feel like you have a death wish or something.what did you get on the torque arm during testing jhon I curious

[racket]

Hi Aaron

I got 16 kgs ~35 lbs at the end of a 2 foot arm , so ~70 ft lbs of stall torque, so >300 ft lbs coming out of the gearbox , with the size sprocket I'm using with teeth at ~2 inch - 0.166 ft radius , that'll amount to a chain pull of ~1800 lbs.

Cheers
John

[monty]

Jan 27, 2020 23:43:14 GMT -5 racket said:

Hi Guys

Ever had one of those days when nothing goes right..............went to buy some steel for the gearbox packer , they didn't have anything thick enough so settled for a 20mm and a 12 mm chunk of plate 100 X 180 mm to get my thickness , the guy cuts the 12 mm OK , but then cuts a 16mm section instead of the 20mm , when I pointed out that 12 + 16 only makes 28 he seemed surprised , but cut me the right piece without throwing a tantrum .........going good here I thought ,......... until he cuts the 25 X 10 mm piece of flat , which looked a tad skinny as he was cutting it in the saw and which on measuring turned out to be only 8mm , so another length of flat removed from the rack and cut , though by this time his "emotions" were becoming obvious, thankfully that was all I needed so paid up and retreated :-)

Then I went looking for some cap screws, 10 and 12 mm , to secure the gearbox , my usual supplier only had coarse thread metric screws , bummer , so off on a 20 minute drive to a specialist fastener shop , they didn't have them either , a third establishment tried but still no luck , on the fourth try they at least had the 10 X 1.25 screws but not in the length I wanted , so settled for a bit longer thinking I could cut off the excess , but on getting them home found the shank was too long , will return them and use slightly short screws instead .

The 12 X 1.5 X 70mm cap screws I've just purchased on Ebay from the comfort of my home .................and the shops wonder why people are deserting them and shopping online.................at last something went right :-)

Cheers
John

I've had plenty of days like that! I always think I want this now, so I'll go shopping. I almost always come home empty handed and wind up ordering what I need. Nobody caries any inventory anymore. Most of the time they have to "special order" it. Then they mark up from wholesale, make me wait a week, and charge shipping anyway. Local bearing houses and the like only cater to their big industrial clients. They will have multiples of what is needed for the local chicken plant! No broad based inventory. I fondly remember the days when you could find a good "parts guy" at the local auto-parts store. Now it's all teenagers, who have never worked on anything outside an Iphone. I have an old jeep that is an amalgamation of parts.....they always want to know if it has air conditioning for some reason... Most of the time I just look up the part number and skip all of that..

The ability to read a tape is a thing of the past. And I've noticed people get mad if you point out their ineptitude, instead of apologizing and making it right.

Companies like McMaster Carr are eating the lunch of these unresponsive little shops. I can look up almost anything on their website, download the cad model into my assembly, and have it delivered to me next day at no extra charge. I've ordered supplies I needed for the next week at 7pm and had the parts waiting on me the next day when I got to work. I have no idea how they do that...but I like it!!

Monty

[azwood]

I think we're heading for the time when parts stores will be obserlete and we will all need to buy online.its sad really I like to support local business and keep my money here.wonder what it's doing for our economy in Australia but that's another can of worms

[azwood]

Jan 28, 2020 2:41:10 GMT -5 racket said:

Hi Aaron

I got 16 kgs ~35 lbs at the end of a 2 foot arm , so ~70 ft lbs of stall torque, so >300 ft lbs coming out of the gearbox , with the size sprocket I'm using with teeth at ~2 inch - 0.166 ft radius , that'll amount to a chain pull of ~1800 lbs.

Cheers
John

Woow that's insane power.i hope to see this powdering something soon