Please feel free to suggest possible fuels :D We are going to do more of these videos so we need ideas :D And thanks to Ashley for making our space program logo, it fits the videos really well :D
They are shorten just to fit there bit more nicely. I don't gather any data from the links or in any other means either. Only our game developer Johannes sees the data from google or apple since I don't have any time to do any extra work on top youtube.
You need a proper injector for the oxygen at the entrance of the combustion chamber, preferably one with a large pressure drop to keep the flow constant. You're currently getting pogo oscillations. The pressure from combustion is pushing back against the oxygen, reducing the flow oxygen, which slows combustion, allowing the flow to speed up again. Also, that lego gas explosion is called a "hard start", where the fuel and oxidizer are already mixed and present in the combustion chamber before ignition. It's one of the best ways to blow up an engine. It's a good thing you built the chamber out of thick steel.
More likely Russia is on the second place, it's still the only country to put people on (and from) the ISS now. Also the second after US to have a full-scale navigation (GloNASS) satellite network. Nevermind, it's not the point here.
The reason for it "farting" (machine-gun like explosions) is because you don't have enough oxygen pressure. In the slow motion video, you can see the flame front travelling back up the hose. This stops the ingress of oxygen, and prevents anything else from burning until the exhaust gas has gone below the gas pressure. You'll need higher pressure gas, or a larger nozzle orifice. Looks like a fun time!
Could perhaps try spaghetti & also try proper modelling clay both dried one & one that's still possible too form, it keeps its shape better & also doesn't crumble in the same way in general it seems. perhaps you can try concrete mix as well if you got any left over from something else or got a friend at work that got some powder over. (Ofc when mixing/ containing this use things you are ready to discard or throw away in case something happens.)
Amen to that... if 100% O2 will cause legos and play-doh to burn, it will probably cause random clear plastic tube to burn. Then you have a burning hose shooting flame and whipping about all over the place. Which would be cool to see in slow-motion, but dangerous to be near!
yeah, seems that the oxygen is burning up into the supply line causing a continuous re-ignition cycle not sure how you could fix that, or if you would even want to in such a design but maybe a one way valve on the inlet
When the first Finnish Astroengineer sets up their hydraulic press on Mars in twenty five years time, you can tell your kids and grandchildren that you were there to witness the start of Finland's space program. The Finland Automatic Rocket Transport. Mk2, affectionately known as F.A.R.T. Number Two.
Great video! Maybe using the hydraulic press, press a giant gummy bear (or more than one if they fit) into the tube and make that into a rocket engine. You'll get to use the press, destroy a giant gummy bear, and quite possibly have the most powerful rocket engine you've tried yet.
That's gonna burn REALLY well, judging from what burning tiny gummy bears in a pure oxygen environment looks. Even at no pressure over atmospheric they burn quite brightly, so I DEFINITELY wanna see that!
Several things. 1. You need higher pressure oxygen. The flame was going back up your input line as it was causing the pressure chamber to oscillate causing slower burning. 2. You should use a more narrow fuel chamber compared to exit nozzle size. This increases the surface area and causes faster burn. 3. For the legos the surface area was much too high compared to oxygen pressure so it could not build up sufficient oxygen concentration to have a good burn.
I think you need a volume regulator not a pressure regulator. Thats why its sputtering. Losing O2 flow when it ignites. You can see the flame in the line.
i´m no rocket scientist, but isn´t the return flame in the line extremely dangerous? I´m assuming there using an O2 tank for this, if the flame gets there, couldn´t the entire thing blow?
Sell it to Virgin Galactic. They would crowd fund another Billion with your playdough. their current space potato is so shit that it can't even propel itself higher then a WW2 messerschmitt
You'll never get more thrust than your oxidizer pressure like this ;) Once the pressure builds it closes your check valve, which is why it also sounds like a pulse jet. but very cool you crazy fin!!!
Great video again, but, how well do you get on with your neighbours. it'd be priceless to know what they're thinking, hearing and smelling 'unburnt lego gas' along with other minor seismic disturbances.. keep it up, good work. (P.S. you could try bitumen, very high energy density)
use birch wood (vanhan liiton kunnon koivu halko) :D and you should try to heat up the oxygen before it goes into the chainber a bit looks like it burns to cool for it to be efficient
yeah true i thought it backwards you need more oxygen to get the stoichiometry right and as a result of that you get more heat and therefore more pressure :P
+Beyond the press fill the rocket with honey and freeze it solid. Leave some kind of removable/burnable rod in the middle to make the oxygen hole or drill it afterwards.
The reason for the sputtering is because of the way the play doh is packed. If you look at solid rocket boosters that NASA or Russian space agency uses, the fuel is tightly packed. If you compressed the play doh into one mass, you would have a more consistent burn.
This would make a great series. Just testing different rocket fuels. Suggestions: Sugar Potato chips Orange peel (high oil content) metal shavings like magnesium Butter Paper or wood
Just wanted to let you know that RUclips UNSUBSCRIBED ME FROM BOTH OF YOUR CHANNELS. I just recognized that I haven't seen you guys post a video in a long time. I go to find that I am no longer Subscribed to your channels. I just re-subscribed today. Thanks for all the wonderful entertainment you and your husband provide on RUclips. Thanks again from California, USA!
Awesome video, aside from burning random things, you could use parts as an instructional video as to why its important to always have flashback arrestors on both oxygen and fuel lines. You have some awesome slow motion video of the flame traveling back up the oxygen tube. As i'm sure you're aware, that can have lethal consequences if the flame makes it to the cylinder.
Yep I have safety valve on the line. I was actually quite suprised that it didn't went off during filming of these videos but maybe I have so long line that the pressure shock didn't go trough as an very strong one.
nozzle shape is hugely responsible for your thrust, u could try a few different shapes and using the same fuel source to figure out which shape gives more thrust
you should melt the legos and cast it into the shape of that tube, except for the hole in the middle. if you can find a way to blend, or grind up the Lego's finely, you can simply melt the Lego's with Methyl Ethyl Keytone (MEK) and it will melt ABS plastic (which Lego's are made of), then harden without burning or compromising the plastic. you just have to finely grind the Lego's, or they won't melt very well.
How about melt down sugar into the engine and have the hole through it? Or like super compacted sugar anyway. Either way, I think you should try the Lego one again but with substantially more oxygen pressure. All that black smoke has the potential to burn cleanly (to CO2), which is what it did eventually. You want more fire? More oxygen!! That backfire at the explosion suggests that it the pressure of the oxygen was significantly lower than the rest of the housing (but there was an explosion... so... ya know... :D). When the backfire happened (and with the other videos on this topic) I've expected the PVC tube to catch fire rather dramatically because anything plus enough oxygen = fire. Maybe do that in a video? Thick bit of tubing + oxygen? Brilliant video as always though!!
also a tip for your chamber; Don't fill the chamber to the brim, you need enough room for the evaporating fuel to mix with the oxidizer. this was very noticeable with the LEGO motor.
Maybe build a stack of lego's, linked together, then turn them down to a cylinder and bore a hole thru the center. Slip that into the canister and bolt it shut and refire the lego engine.
few suggestions: You may use cylinder PMMA (just something with higher melting point), drill hole in the middle and lathe outside diameter to make it fit your steel pipe. Tune the oxygen flux carefully since the fuel can't burn properly if the air flow is too small nor too large. It's difficult to maintain the combustion under very high flow rate.
A one way valve would probably be a good idea, but one thing I noticed. The play-doh burned more consistently, while the Legos burned more powerfully in bursts, why not a mixed rocket of play-doh and legos? The best of both worlds.
Maybe the thrust was so low because the initial nozzle pressure can only be as high as the oxygen flow pressure before the burning gas pushes out both ends of the rocket
you just gotta try different printing plastics, like PLA, ABS, Nylon, HIPS and PETG. by either coiling them in the rocket cylinder or printing a block of fuel. :D
Very intetesting experiments! Ithink the bearings of the IKEA drawer will have a lot of Stick-slip. Will only move after a bump. So maybe construct a proper slide with prffesional guidance and bearings! Success!
Please feel free to suggest possible fuels :D We are going to do more of these videos so we need ideas :D
And thanks to Ashley for making our space program logo, it fits the videos really well :D
Chokolate! :D
Try some Vegemite/Marmite. I think you'd enjoy using as a rocket fuel more than eating it anyways.
Shredded lego plastic crammed into the pressure vessel.
Beef fat, talo, or lard. Sausage may also work well.
They are shorten just to fit there bit more nicely. I don't gather any data from the links or in any other means either. Only our game developer Johannes sees the data from google or apple since I don't have any time to do any extra work on top youtube.
You need a proper injector for the oxygen at the entrance of the combustion chamber, preferably one with a large pressure drop to keep the flow constant. You're currently getting pogo oscillations. The pressure from combustion is pushing back against the oxygen, reducing the flow oxygen, which slows combustion, allowing the flow to speed up again.
Also, that lego gas explosion is called a "hard start", where the fuel and oxidizer are already mixed and present in the combustion chamber before ignition. It's one of the best ways to blow up an engine. It's a good thing you built the chamber out of thick steel.
Alexander van Gessel not even going to mention flashing back through supply line .
Space Race:
1. USA
2. EU
3. China
4. Russia
...
...
195. Hoodraulic Press Channel
196. North Korea
Indeed haha
More likely Russia is on the second place, it's still the only country to put people on (and from) the ISS now. Also the second after US to have a full-scale navigation (GloNASS) satellite network.
Nevermind, it's not the point here.
mihan2d Russia was first into space…
Karl Bjorn, The space race was still going after the first objects and men in space and ended with man on the moon.
Myrmidon bullshit North Korea claims to it's citizen it has landed in the sun when asked when they said night
The reason for it "farting" (machine-gun like explosions) is because you don't have enough oxygen pressure. In the slow motion video, you can see the flame front travelling back up the hose. This stops the ingress of oxygen, and prevents anything else from burning until the exhaust gas has gone below the gas pressure.
You'll need higher pressure gas, or a larger nozzle orifice.
Looks like a fun time!
sounds like a pulse engine. Also.. you should probably put a flame arrestor on the oxygen line.
There is one put it isn't in the picture
Could perhaps try spaghetti & also try proper modelling clay both dried one & one that's still possible too form, it keeps its shape better & also doesn't crumble in the same way in general it seems.
perhaps you can try concrete mix as well if you got any left over from something else or got a friend at work that got some powder over. (Ofc when mixing/ containing this use things you are ready to discard or throw away in case something happens.)
Amen to that... if 100% O2 will cause legos and play-doh to burn, it will probably cause random clear plastic tube to burn. Then you have a burning hose shooting flame and whipping about all over the place. Which would be cool to see in slow-motion, but dangerous to be near!
yeah, seems that the oxygen is burning up into the supply line causing a continuous re-ignition cycle
not sure how you could fix that, or if you would even want to in such a design
but maybe a one way valve on the inlet
Also, you should machine a venturi for the nozzle, it will definitely improve the results
I always get caught by those unburned Lego gasses too!
Use the Hydraulic Press to cruch all the legos into that metal tube.
*stares at title in disbelief*
well, if it's gonna go anywhere then this is the channel
krosulhah I absolutely agree! XD
When the first Finnish Astroengineer sets up their hydraulic press on Mars in twenty five years time, you can tell your kids and grandchildren that you were there to witness the start of Finland's space program. The Finland Automatic Rocket Transport. Mk2, affectionately known as F.A.R.T. Number Two.
fart is one of the replacements word "luck" in polish
melt the Lego and fill the metal container and then drill a hole in the middle like you did with the playdoh. you will probably get a better result
Rasyad Redha wouldnt it be easyer just to press it in.
Even better, melt the ABS in Acetone and then the goopy mixture would be incredibly good for fuel
I think it would be best to grind it down to a sand/gravel-like powder.
Or use ABS filament and print a core.
With proper air channels! Would love to see that.
Great video!
Maybe using the hydraulic press, press a giant gummy bear (or more than one if they fit) into the tube and make that into a rocket engine.
You'll get to use the press, destroy a giant gummy bear, and quite possibly have the most powerful rocket engine you've tried yet.
I already have giant gummy bear waiting to be used as an rocket fuel :D
RIP giant gummy bear. :)
That's gonna burn REALLY well, judging from what burning tiny gummy bears in a pure oxygen environment looks. Even at no pressure over atmospheric they burn quite brightly, so I DEFINITELY wanna see that!
This video sums up Finnland pretty acurate
Several things.
1. You need higher pressure oxygen. The flame was going back up your input line as it was causing the pressure chamber to oscillate causing slower burning.
2. You should use a more narrow fuel chamber compared to exit nozzle size. This increases the surface area and causes faster burn.
3. For the legos the surface area was much too high compared to oxygen pressure so it could not build up sufficient oxygen concentration to have a good burn.
Need some fuel? Just ask me (I will support Finnish Space Program)
I think you need a volume regulator not a pressure regulator. Thats why its sputtering. Losing O2 flow when it ignites. You can see the flame in the line.
Michael Garner Bingo!!!
Yeah, I think they need high pressure oxygen connected via a small pinhole. That should stop the pulsing they're getting.
Yeah, come one, it's not rocket science.
deltib 😄
i´m no rocket scientist, but isn´t the return flame in the line extremely dangerous? I´m assuming there using an O2 tank for this, if the flame gets there, couldn´t the entire thing blow?
Glad to see the Finns' space program is coming along nicely.
"Napalm on your skin not ideal" -Finland
you guys have style, I love it. pet the kitties
Sell it to Virgin Galactic. They would crowd fund another Billion with your playdough. their current space potato is so shit that it can't even propel itself higher then a WW2 messerschmitt
Job91 lol
Job91 keep in mind they are trying to make it cheap enough for everyday civilians.
Dominic Gordon u
Raoul TAZIEF lol
Dominic Gordon good point. But the more money they put in, the more they have to charge
You'll never get more thrust than your oxidizer pressure like this ;) Once the pressure builds it closes your check valve, which is why it also sounds like a pulse jet. but very cool you crazy fin!!!
Try to use coal ore ducktape in that rocket engine it should work? :)
Where do we sign up for the FSP? (Finnish Space Program)
Maybe surstromming would work better.
Make a surstromming rocket and shoot it at Sweden.
What would happen if you melted the legos down first, to have a more solid fuel?
You could try mixing sugar and potassium nitrate, it makes a pretty decent solid rocket fuel
literally a million times
Actually only 26,100~ times
Who cares about the police state which is UK?
Potassium Nitrate is really hard to get in Canada it seems.
Don`t worry, finland is the nanny state number one when compared. :D
Maybe do it with spam? Might as well find a good use for that stuff.
Great video again, but, how well do you get on with your neighbours. it'd be priceless to know what they're thinking, hearing and smelling 'unburnt lego gas' along with other minor seismic disturbances..
keep it up, good work. (P.S. you could try bitumen, very high energy density)
That new Saturn Lego rocket should fly well....
After seeing the flames in the pipe with the lego, i hope you have a flashback arrestor.
Machine a proper rocket nozzle if you want to generate any kind of useful thrust. Otherwise you just have a very fancy fire machine.
Should make a bacon rocket.
I'd suggest
-old tires
-toilet paper
as possible fuels.
"It's fartting" killed me😂
I need the attach one of those things to the back of a Honda civic. it might be better than VTEC
Scarfhead 1400 😂
MORE ROCKETS!! Loved it. Try paraffin, tar, and rubber as more fuels. Also you should machine a proper nozzle on your lathes
You guys make me smile. Thanks for your videos!
use birch wood (vanhan liiton kunnon koivu halko) :D and you should try to heat up the oxygen before it goes into the chainber a bit looks like it burns to cool for it to be efficient
yeah true i thought it backwards you need more oxygen to get the stoichiometry right and as a result of that you get more heat and therefore more pressure :P
"It will be just like napalm on your skin. So, not ideal." Indeed, that sounds like a pretty suboptimal outcome.
The Kerbals would be so proud of such a rocket design XD
what if lauri is the guy in my summer car game
what about coffee beans or coconut butter
coffee beans is quite interesting one :D coffee beans vs. chocolate :D
bay leaves vs tea leaves lol
try sausages, If I recall correctly, myth busters made a salami rocket which worked quite well.
haha Rocket can not lift play-doh, finish solution? Add more weight. lol.
This was delightful
looks like the flames backed up the tube a little bit, this can be dangerous
+Beyond the press fill the rocket with honey and freeze it solid. Leave some kind of removable/burnable rod in the middle to make the oxygen hole or drill it afterwards.
That is the most beautifully ghetto way of measuring the thrust of the rocket. 10/10
That block of Legos looked like a miniature model of the tall hotel building in Tampere.
The reason for the sputtering is because of the way the play doh is packed. If you look at solid rocket boosters that NASA or Russian space agency uses, the fuel is tightly packed. If you compressed the play doh into one mass, you would have a more consistent burn.
Awesome seeing you guys on outrageous acts of science!
This would make a great series. Just testing different rocket fuels.
Suggestions:
Sugar
Potato chips
Orange peel (high oil content)
metal shavings like magnesium
Butter
Paper or wood
I am glad I can watch this on RUclips, so I don't have to breathe in that smoke.
Thinking outside the box...that's how all of us should approach problems.
Lego and Play-Doh mixed together!
A lego rocket.
#welcometotheinternet
10:27 - With slow mo footage you really notice how far that flame moves back up the oxygen line with the decrease in pressure.
I don't think anyone has ever tried to analyse the fluid slow in a solid lego fuel rocket. there must be some interesting things happening there
The burning legos looked like a diesel car rolling coal :D. Maybe even try diesel as fuel
try a Sugar rocket or a Pasta rocket too they make excellent fuels, they both might even work together with the Play Doh !!!! great stuff you 2
So lego is like the diesel of the space program.... more power, but lots of smoke.
Just wanted to let you know that RUclips UNSUBSCRIBED ME FROM BOTH OF YOUR CHANNELS. I just recognized that I haven't seen you guys post a video in a long time. I go to find that I am no longer Subscribed to your channels. I just re-subscribed today. Thanks for all the wonderful entertainment you and your husband provide on RUclips. Thanks again from California, USA!
Use plastic shopping bags as fuel.
That would be interesting!
Awesome video, aside from burning random things, you could use parts as an instructional video as to why its important to always have flashback arrestors on both oxygen and fuel lines. You have some awesome slow motion video of the flame traveling back up the oxygen tube. As i'm sure you're aware, that can have lethal consequences if the flame makes it to the cylinder.
Yep I have safety valve on the line. I was actually quite suprised that it didn't went off during filming of these videos but maybe I have so long line that the pressure shock didn't go trough as an very strong one.
Awesome, had to sub just on the accent, been watching for long time but this one did it for me..
10:14 I jumped in my seat. For some reason, I didn't expect that. Great video :D
nozzle shape is hugely responsible for your thrust, u could try a few different shapes and using the same fuel source to figure out which shape gives more thrust
I would love to see food as fuels - pancakes or something :D
you should melt the legos and cast it into the shape of that tube, except for the hole in the middle. if you can find a way to blend, or grind up the Lego's finely, you can simply melt the Lego's with Methyl Ethyl Keytone (MEK) and it will melt ABS plastic (which Lego's are made of), then harden without burning or compromising the plastic. you just have to finely grind the Lego's, or they won't melt very well.
What if you combined the Legos and play doh? I think it could have the consistent burn of the play doh but the power of the Lego.
LEGO rocket fuel? I think HPC just uncovered Top-Secret Danish space technology.
How about melt down sugar into the engine and have the hole through it? Or like super compacted sugar anyway.
Either way, I think you should try the Lego one again but with substantially more oxygen pressure. All that black smoke has the potential to burn cleanly (to CO2), which is what it did eventually. You want more fire? More oxygen!! That backfire at the explosion suggests that it the pressure of the oxygen was significantly lower than the rest of the housing (but there was an explosion... so... ya know... :D).
When the backfire happened (and with the other videos on this topic) I've expected the PVC tube to catch fire rather dramatically because anything plus enough oxygen = fire. Maybe do that in a video? Thick bit of tubing + oxygen?
Brilliant video as always though!!
love these hybrid rockets!
Be interested to see how wood would perform, imagine it's terrible but worth a shot.
also a tip for your chamber;
Don't fill the chamber to the brim, you need enough room for the evaporating fuel to mix with the oxidizer. this was very noticeable with the LEGO motor.
Damn! If you wanted you could probably make like a rocket powered soapbox car with the lego because POWER.
You need to wear pants when you're dealing with plastic and fire!!! xD stay safe I love the videos!!
Maybe build a stack of lego's, linked together, then turn them down to a cylinder and bore a hole thru the center. Slip that into the canister and bolt it shut and refire the lego engine.
I suggest a flashback arrestor between the rocket motor and the plastic gas line.
A converging part on the nozzle should help to get it to high chamber pressure before speeding up and expanding on diverging part
"Lego smoke, don't breathe" lol
few suggestions:
You may use cylinder PMMA (just something with higher melting point), drill hole in the middle and lathe outside diameter to make it fit your steel pipe.
Tune the oxygen flux carefully since the fuel can't burn properly if the air flow is too small nor too large. It's difficult to maintain the combustion under very high flow rate.
Fuel suggestion: the brown stuff on the end of matches. Lots of it. Lots.
A one way valve would probably be a good idea, but one thing I noticed. The play-doh burned more consistently, while the Legos burned more powerfully in bursts, why not a mixed rocket of play-doh and legos? The best of both worlds.
Maybe the thrust was so low because the initial nozzle pressure can only be as high as the oxygen flow pressure before the burning gas pushes out both ends of the rocket
more of this
You need to do this with wood! Best fuel, burns long.. I loved that one.
I like the pulsating sound... good luck for your first real space mission. I hope you are not using your cat as first passenger
I'd like to see a metal fuel hybrid rocket engine, using the same principal as thermite (oxidizing aluminium), or thermal lances.
Metal version of good mythical mornings 'will it' series. Awesome
Shredded ping-pong balls as fuel... also I see that the flame is being drawn up the oxidizer line could you add a one way valve for added safety?
Try sugar as a fuel, maybe some kind of candy like gummy bears. Lawn clippings maybe.
"Unburnt lego gas" An everyday problem only found in Finland.
i think using plastic shopping bags as fuel might work really well.
my suggestions for fuel: Salt, Cotton, road flairs, wood, fidget spinners (for the kids)
you should take a look on Laval nozzles and test the better shape of cone, that will do a huge boost in the force made by the rocket
You just need much more pressure in the oxygen line to get some thrust, or include the oxidiser to the fuel mixture
The Lego burned hot enough to temper the steel, so I'd say that's the winner.
you just gotta try different printing plastics, like PLA, ABS, Nylon, HIPS and PETG. by either coiling them in the rocket cylinder or printing a block of fuel. :D
Very intetesting experiments! Ithink the bearings of the IKEA drawer will have a lot of Stick-slip. Will only move after a bump. So maybe construct a proper slide with prffesional guidance and bearings! Success!
Rather have a rocket hit me while activate then step on a lego
Perhaps use a big pendulum/swing to mount the rocket on and measure the stable angle it makes when ignited; could be a sensitive force-meter.
Would be cool to see flour as fuel. Like a flour/air mixture via one pipe.
1st , press the Lego's into the cylinder, make it nearly solid pressed Lego's.
2nd , drill down through Lego mass.
3rd, redo Lego test.