Lockwood-H pulsejet with variations will it work?
Posted: Thu Jan 21, 2016 11:28 am
I'm planning on building a pulse jet in the near future, for the design i used the 1967 lockwood patent, using all the proportions in this patent i came up with the following sizes. Because i can't make a inwards tapering cone bend i instead decided to end the inward tapering cone before the bend and i also made the exhaust and inlet end at the same height. I would appreciate it if someone would take a look and guess whether or not they think it'll work, mostly whether the non inward tapering bend will work with the pipe in between the combustion chamber and the bend.
Also the diameter of the bend is the diameter from the middle of the tube to the middle of the opposite tube.
The proportions (all gotten from the lockwood patent, Combustion chamber has a 45º angle on both sides)
O means towards the exhaust
I means towards the inlet
L means length
M means average diameter
NozzleM=4,15"
CombustionM=11"
ExhaustM=3,825"
ExhaustO/ExhaustI=1,55
ExhaustL=28*ExhaustM
CombustionO/CombustionI=1,0625
CombustionL=CombustionM*1,45
NozzleO/NozzleI=1,083
NozzleL=NozzleM*3,85
CombustionI/NozzleO=2,46
ComustionO/ExhaustI=3,66
i do not own the rights to this picture i took it from the valveless pulsejets 1,5 pdf i got from this site, as said i got the dimensions from a patent in 1967 which i believe has expired. The patent has been included the file's called pulsejet proporties forgot to change the title. I've included the excel file i made for the size calculations if required i can easily change all the proportions, it also includes the circles and degrees i'm planning on using to make the cones.
Update 1:
Whilst looking around to see if my answer was in some other section i found a patent in the pulsejet designs section, this design comes pretty close to my design apart from my tailpipe being quite allot longer about 34 inches and the diameter of my combustion chamber was quite allot bigger a difference of 4,28 inches on the tailpipe side. I noticed that the angles on both sides of the combustion chamber towards the tailpipe and towards the nozzle aren't 45º where as my design is based on a 45º angle.
To fix the length of the tailpipe i could i it isn't functioning take out the piece between the combustion chamber and the bend which is part of the tailpipe. I've included the other design from the forum.
Update 2:
After tweeking my design to match up with the design i posted in my previous reply i'm quite sure i've got one working now with a few slight differences, for one i'm still using a 45º angle the combustion chamber and both the exhaust and the intake. and as i've already got a 180º bend i've tweeked so the total exhaust length comes up to the 72,7 inches long. Also i used my own program to calculate it all so both ends come up to the same point (intake and exhaust). The almost unreadable number specifying the intake end of the combustion chamber was when i google image searched it 6,5 inches according to one Swedish forum if someone knows whether or not that's true please do tell me.
(I thought it might get noticed as a separate thread i frist posted them in the i am new and i need help section)
Also the diameter of the bend is the diameter from the middle of the tube to the middle of the opposite tube.
The proportions (all gotten from the lockwood patent, Combustion chamber has a 45º angle on both sides)
O means towards the exhaust
I means towards the inlet
L means length
M means average diameter
NozzleM=4,15"
CombustionM=11"
ExhaustM=3,825"
ExhaustO/ExhaustI=1,55
ExhaustL=28*ExhaustM
CombustionO/CombustionI=1,0625
CombustionL=CombustionM*1,45
NozzleO/NozzleI=1,083
NozzleL=NozzleM*3,85
CombustionI/NozzleO=2,46
ComustionO/ExhaustI=3,66
i do not own the rights to this picture i took it from the valveless pulsejets 1,5 pdf i got from this site, as said i got the dimensions from a patent in 1967 which i believe has expired. The patent has been included the file's called pulsejet proporties forgot to change the title. I've included the excel file i made for the size calculations if required i can easily change all the proportions, it also includes the circles and degrees i'm planning on using to make the cones.
Update 1:
Whilst looking around to see if my answer was in some other section i found a patent in the pulsejet designs section, this design comes pretty close to my design apart from my tailpipe being quite allot longer about 34 inches and the diameter of my combustion chamber was quite allot bigger a difference of 4,28 inches on the tailpipe side. I noticed that the angles on both sides of the combustion chamber towards the tailpipe and towards the nozzle aren't 45º where as my design is based on a 45º angle.
To fix the length of the tailpipe i could i it isn't functioning take out the piece between the combustion chamber and the bend which is part of the tailpipe. I've included the other design from the forum.
Update 2:
After tweeking my design to match up with the design i posted in my previous reply i'm quite sure i've got one working now with a few slight differences, for one i'm still using a 45º angle the combustion chamber and both the exhaust and the intake. and as i've already got a 180º bend i've tweeked so the total exhaust length comes up to the 72,7 inches long. Also i used my own program to calculate it all so both ends come up to the same point (intake and exhaust). The almost unreadable number specifying the intake end of the combustion chamber was when i google image searched it 6,5 inches according to one Swedish forum if someone knows whether or not that's true please do tell me.
(I thought it might get noticed as a separate thread i frist posted them in the i am new and i need help section)