HPST 2020 Jet Engine

[praendy2203]

Hi John,

during last testings, the HPST went to
60 000 without any problems and vibrations.

The weather is now more shitty, rain and snow is melting without starting the engine😉

Tomorrow I will get some copper seals for the 12 nozzles, high voltage device and spark plugs.

Until I will drill 6 additional holes in that stupid Inconel and make a new fuel ring with 12 connections👍

Cheers Andy

[praendy2203]

Hi,

new video from my jet engine.

After some improvements, the afterburner starts to work very well.

I am restricted in rpm, because my cheap ebay pump run on its limit.
Need at least twice the amount of fuel😂

Will see next week.

Andy

[racket]

Hi Andy

Getting very close now , some nice exhaust flame shapes , ignition good .

Did I notice some extension "tubes" on the injectors to delivery the fuel at mid blade position ??

Yep , more fuel more fuel :-)

Cheers
John

[praendy2203]

Hi John,

the last picture in the video you mean?

Thats 0,8 mm lockwire to get the fuel directed and my already 0,4 mm to 1mm wide drilled holes smaller again.

1mm was too much and the fuel was burning in the outer tube.

Now working perfect👍

Cheers Andy

[racket]

Hi Andy

Yep , last pic , excellent outcome :-)

Cheers
John

[praendy2203]

Hi,

more afterburner testing in the video.

Noise and performance incredible, but the very important thrust is missing a lot.

Have to work on and find the cause👍

Andy

[ausjet]

Impressive Andy! Looks like the combustion is happening right at the end of the ab. Have you got your variable nozzle hooked up to any sort of automatic control?

[praendy2203]

Hi,

thank you!

The variable nozzle is not automaticly controlled.
The geometry is managed with my right hand and the radio transmitter.
I try to find the optimal diameter by testing the output.

Once its done, I only use a switch for both positions and save them into the transmitter.

I also have a feeling, the nozzle gets more open if the burner is operating.
Because of the heat, the metal expands and the diameter becomes more.

Little problems, I hope😉

Cheers Andy

[Chuks]

nice engine you got there, everything is just so nice.

[Chuks]

Feb 16, 2021 5:35:49 GMT -5 praendy2203 said:

Hi John,

during last testings, the HPST went to
60 000 without any problems and vibrations.

The weather is now more shitty, rain and snow is melting without starting the engine😉

Tomorrow I will get some copper seals for the 12 nozzles, high voltage device and spark plugs.

Until I will drill 6 additional holes in that stupid Inconel and make a new fuel ring with 12 connections👍

Cheers Andy

hi mate,
please what you want to achieve with this great Engine?
what is the design Pressure Ratio PR and max RPM?
I have been eyeing the GTX5533r wheel with chra for an engine build
but not yet.

[praendy2203]

Hi Chucks,

the engine is built only because, I wanted to build a jet engine😉

Its far too heavy for a plane.
With afterburner almost 18 Kg.

I use it maybe for some events, or jet meetings.

The PR should be~ 3,2 and max rpm 70 000.
The turbine wheel and ngv is the second stage from Panavia Tornado fighter jet.
I found those parts at Ebay UK.

I use the Garrett GTX 5533 wheel in this engine.

Cheers Andy

[praendy2203]

[praendy2203]

Hi,

a new video is available.

The engine is still alive and needs a new compressor wheel again.

All other parts are in very good condition.

The cause is still a secret, but by the fact I use a Teflon housing for the intake section, the plastic got too hot, because of a rubbing comp wheel.

Ok, no problem so far😉

Andy

[racket]

Hi Andy

Nice video of the trials and tribulations of developing an engine :-)

Things in the compressor stage start getting pretty hot once up to decent Pressure Ratios at 2 Bar P2 your T2 will be ~150 + deg C , the Teflon might have expanded by quite a bit as well as "softened" .

Its just a minor problem , the rest of the engine is working well .

Love your A/B operation , its making a nice "breeze" :-)

Cheers
John

[wannabebuilderuk]

Afterburner looks amazing, grass behind it not so much 😁

Love the driving around on the trolley bit lol