"Fat Boy" 12/118 thrust engine

[pitciblackscotland]

Well done John nice solid run you getting there.

Cheers,
Mark.

[Johansson]

Wow John! Finally some real progress after all the R&D you´ve done. I am so happy for you, you´ve been banging your head against the temp spike issue for so long that you deserved some good news!

I would really have liked to be there and hear it in first person, it is difficult to get a feeling of how it runs from the video.

The temp difference is strange since it has switched sides, a sensor problem would perhaps not cause a reading like this.

Have you checked the syringes for damage at the tips? Today I found one of the JU-02 syringe tips broken off (I think we have similar designs with a bent tip for wall spray) so has been injecting fuel straight down the evaporator tube for who knows how long.

Cheers and congratulations John!
/Anders

[racket]

Hi Anders

Yep , its been a long journey , but a bit of an education as well .

I'm seriously thinking about making another fuel manifold with much larger bore injectors to reduce fuel pressure as my pump supply pressure is at >70 psi , and also to reduce the injection "velocity" to enable flowing the fuel onto the tube wall rather than having a high speed with possible "splashing" and fuel being carried through the tube.

I might get the fuel manifold out and do a water flow test to check whats happening , there coud be a either a hot streak or a cold streak happening , hopefully its a hotstreak I'm measuring and the turb is only experiencing the lower temp.

Cheers
John

[Chuks]

congrat John,

finally she lives.....

[stoffe64]

Congratulations John!
Very fun to see and hear the engine run
What fuel you use this time,the fast burning petrol/kerosine mix (jp3)or was it pure kero?
Cheers Stephan

[racket]

Hi Stehan

Fuel was 2 parts petrol to one part kero , it seems to work OK , and its less expensive than straight kero :-)

Cheers
John

[turboron]

John, is your petrol the same as gasoline?

Thanks, Ron

[racket]

Hi Ron

Yep, I use ordinary lead free petrol same as in our car , ~$AU1.40 per liter compared to $AU2 per liter for kero, and its available locally rather than a 20 minute drive away for kero :-)

Cheers
John

[elventu]

Awesome job!
Congratulations John!

[azwood]

So what's this going into I vote small jet boat

[azwood]

They sell these in kit form I want one.

Attachments:

[racket]

LOL..........if all goes to plan then shaft power might be an option rather than a thrust engine , the G Trim wheel with its "standard" exducer should produce less "exhaust velocity" from the wheel making it more suitable to feed into a freepower, I need a few more test runs to find out .

Cheers
John

[azwood]

Mar 1, 2019 0:05:18 GMT -5 racket said:

LOL..........if all goes to plan then shaft power might be an option rather than a thrust engine , the G Trim wheel with its "standard" exducer should produce less "exhaust velocity" from the wheel making it more suitable to feed into a freepower, I need a few more test runs to find out .

Cheers
John

Hope it all goes well.thease days boats are one of the only craft left that you can still go a little wild I've seen a few air research turbines for sale lately from generators not sure what power they make but worth a look for our projects.

[racket]

LOL.......remember BIG is BEST when it comes to turbos ;-)

[azwood]

Mar 1, 2019 0:38:54 GMT -5 racket said:

LOL.......remember BIG is BEST when it comes to turbos ;-)

Yep agreed 😋