HPST 2020 Jet Engine

[racket]

Hi Andy

Yep , go for the seniors tricycle record :-)

She sounds beautiful .

Cheers
John

[praendy2203]

[praendy2203]

Hi,

Its was much fun to drive the trike so fast🥰

Performance of the engine and controls are very good and reliable so far.

Maybe I should wear a better clothing🤔

Andy

[racket]

Andy Andy Andy , lucky you , living out your childhood dreams :-)

You've done a beautiful job of the controls , not an easy thing to accomplish on a bicycle , getting things "civilised" and functional takes time .

Heh heh , one can only wonder how that other bike rider felt being overtaken by a thundering trike .

Bigger fuel tanks required to increase your fun time ;-)

Gunna watch the video again and have more laughs , thanks for sharing , some really good camera work .

Cheers
John

[richardm]

Congrats! Very well done!
I have 2 questions if you don't mind.
Is the variable AB nozzle functional ? I ddi not see it working. If not are you going to push it a notch further and make it work ?
And why isn't the AB tube glowing white hot like most others we see? How do you manage to keep it that cool. To me its a great achievement keeping it that cool, I always get worried seeing a tube glowing close to its melting point.

[praendy2203]

Hi John,

yes i am still a kid🤣

I will show the simple controls i use in one of the next videos.

There is only one "special" bluebox, what manages the engine speed.

www.ebay.de/itm/276223665630

The controller is able to set a minimum and maximum output voltage.
Also the time can be set from one value to the next.

Lets say, the engine runs at 25% controller setting in idle and i change with the rotating knob to my current max output of 55%, i can program a certain time.
Usually the change would happen in a few ms, but i set a time of 2,5 seconds.
Also from max speed to idle i set 2,5 seconds.
This prevents a flame out and the engine accellerates very good.

You will see soon👍


Hi Richard,

the nozzle is working, but still needs some adjustments.
If the engine is running, the outer afterburner pipe is expanding and the nozzle gets stuck.
For the controls i use a bicycle brake handle and a mechanical flex cable.

The afterburner is based on the original design with an inner flame tube and an outer tube.
Betweem the tubes these are ~10mm space for the "cooling air".
The flame tube has ~450 holes and a star shaped flame holder.

Also i think, this configuration "saves" much fuel and you get a very good result in burning quality.

When I used only the outer pipe, the fuel flow was much more and the flame shape and lenght was totally different.

This week I hope to get my brakes sorted.
The brakes are the worst type and decellerate almost nothing🤣

Keep you updated👍

Andy

[praendy2203]

[racket]

Hi Andy

Thanks for the Link to your controller :-)

So much new stuff around to help us do things , good to have the ramp up/down function , saves one more thing to have to think about when there is already too many .

With your A/B , its performing beautifully , good ignition and a nice flame , could you please post more pics of the setup as I'm interested in the positioning of the fuel injection , flameholder , etc etc , as our usual dump style A/B doesn't produce the results it should , undoubtedly having an axial turb wheel will mean a different style of entry for the gases compared to our radial wheels , but hopefully theres some overlap of "ideas" that we can use to improve our performance .

I'm currently starting to add a diffuser at the entry to my A/B along with 3 V gutters to compliment a reduced dump flameholder width to see if it improves outcomes .

That must have been fun drilling those liner holes :-(

Cheers
John

[richardm]

Thanks for the info Praendy. Your after burner is really well designed. We can see that the flame is uniform and steady from a good burn.Impressive !

[praendy2203]

Hi guys,

I will show you the details of my afterburner.

Tomorrow I have some time to remove the a/b.
I have to check the combustin chamber.
Maybe some parts of one or more sticks are missing🤣
I saw some sparks came out during cutting the video.

Andy

[racket]

Hi Andy

I'll be looking forward to the pics :-)

Cheers
John

[praendy2203]

Hi guys

you have to wait one more day

I didnt have time to do anything.🤣

Andy

[praendy2203]

Hi,

today I managed to do some pics.

If you need more detailed pics, please ask me☺️

The whole burner is only 50 cm long and has 160 mm diameter.
The inner flametube is 140 mm in dia.

The variable nozzle has a range from 110 mm open (a/b seperate nozzle 105 mm) and 95 mm closed.

Good luck😉

Andy

[praendy2203]

[richardm]

Thanks for the picture. Very well made!