APS/Ω Gas turbine bike build

[Mobacken Racing]

I did a test with the bike today but ran out of air in the scuba tank before I had figured out the idle throttle setting, I´ll give it another go once I have had the scuba tanks filled.

https://youtu.be/mDKXIYoMZWI

Cheers!
/Anders

[Mobacken Racing]

I tried the bike again today with newly filled scuba tanks, but no go. The engine won´t increase in revs when the fuel is applied, it just sends billowing flames out the exhaust pipe.

After some consideration I measured the inner diameter of the syringe injectors, both the new ones and the ones I used before. Small wonder the engine didn´t run, the new green size syringes have an inner diameter of slightly over 0.5mm while the old ones was a snug 0.4mm ID. The flow areas are 0.23mm2 compared to 0.125mm2, in other words almost twice the flow area.

Looking at some syringe charts found with Google there seems to be some kind of confusion with the color markings, for example Black can be both 0.305mm OD and 0.7mm OD depending on where on what chart you look at...



I´ve just ordered a set of 0.7mm OD Black syringes which should be of the same size as the old ones that apparently worked just fine, they choked at around 2.5bar P2 but with water injection I think I should get some decent speed out of the bike anyway. Good thing I found this out now and not a week before the One Mile race.

Cheers!
/Anders

[Mobacken Racing]

A pic from before the test, I have some video as well but it is pretty much worthless since the bike didn´t start.



Engine removed from the bike and uncovered in 5 minutes.



15 minutes later it looked like this.



Now I just have to wait for the syringes to arrive...

Cheers!
/Anders

[Mobacken Racing]

With JU-01 taken out of the bike chassis I had the opportunity to test fit JU-02 to see if the feet are spaced apart properly and how close to the fuel tank the oil return fitting will sit. And of course to see what it will look like.

Old JU-01 engine installed:



New JU-02 test fitted, it sure fills out the chassis better.



Oh yes.



Other side:



To sum this up I can´t wait until I can install JU-02 in the bike and feel what 250+ gas turbine horses feels like!

Cheers!
/Anders

[Peter Jack]

Awesome Anders!!! 

Pete

[grumm441]

Nice
It almost looks like there's room for both of them
G

[krusty]

Don't go giving him ideas, Grumm! 

vic

[bbarn]

Not vouching for these guys or their product, just passing along a quick google search. Maybe you can get more consistent materials from one of these guys (or someone else)?


http://fsgsbxg.com/1mmStainlessSteelTube/ss_4mm.htm

[Mobacken Racing]

A twin engine bike would be a sight to behold...

The syringe needles are on their way so I´ll try them first, it is really not that sensitive so as long as the flow is in the ball park and consistent between all 18 injectors it is good to go.

After a great Easter weekend with the family I managed to get some work done on the JU-02 test stand, I borrowed a magnet drill from work to drill bolt holes in the someday-to-be fan dyno stand.



Here the test stand is bolted in place.



I need to add a rear bracket but I can do that later, I drilled a bolt hole for it while I had the magnet drill at home.



Cheers!
/Anders

[Mobacken Racing]

The new 0.7mm syringes arrived yesterday!



Needless to say Friday night was workshop night, here I am removing the old syringe injectors from the fuel plenum.



I am glad I have small hands and kept from drinking overly much coffee...



With all of the 18 injectors silver soldered and bent into shape I could test flow them with propane, all had the same flame height so they are good to go.



Before I called it a night I assembled most of the JU-01, so there is not much work left before I can do another test start!



Cheers!
/Anders

[WOODY@DDLLC]

Anders, aren't the number of candles supposed to match your age? 
Seriously - looking good - as usual! 

[Seldom Seen Slim]

And - you bent all 18 of those syringe/injectors from straight to the flared-over end -- free hand?

Unh, guys, I think we've found us a true magician.

[Mobacken Racing]

Anders, aren't the number of candles supposed to match your age? 
Seriously - looking good - as usual! 

Not far from, the main difference from when I was 18 is the amount of nose hair and how far I can piss.

And - you bent all 18 of those syringe/injectors from straight to the flared-over end -- free hand?

Unh, guys, I think we've found us a true magician.

The syringes are stiff as piano wire but if you heat them with the propane torch and quickly cool them down by blowing at them they become very easy to bend around a finger tip without folding.

[grumm441]

The new 0.7mm syringes arrived yesterday!

I am glad I have small hands and kept from drinking overly much coffee...




Cheers!
/Anders

I know I've had enough coffee when I can thread the needle on a sewing machine, when it's running
G

[Mobacken Racing]

Hi guys!

I ran the bike tonight with good results, the engine started and ran up to idle with seemingly lower exhaust temps than before.

https://youtu.be/uO_eUI9-2Q4

I say seemingly since I didn´t have a chance to check it over a longer period of time, the home designed PWM controller for the fuel pump had an undersized transistor with an overload safely feature that cut the pump voltage as soon as the fuel pressure started to rise.

Olov helped me find the problem over the phone so I am very satisfied with todays run, it is great to be able to sort these issues out this early in the season!

Now it is time to hit the sofa for an episode of "Land Speed Heroes".

Cheers!
/Anders