Lady Anne variation.
Moderator: Mike Everman
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Re: Twin Lady Anne
Dear James.
The model shows this tailpipe design has 2 possible locations for the centre of combustion. The first is very close to the sparkplug and the second just behind the induction pipe. The high power comeing from combustion in the first location. Your first Video shows, during warm-up, these two locations heating-up almost together. I’d very much like to see a video of the second motor variation during warm-up. Your changes to the induction pipe location and angle -
[quote="James D"]“I changed it because I felt that the incoming air was colliding together at too sharp an angle and not moving deep enough into the combustion chamber.â€
The model shows this tailpipe design has 2 possible locations for the centre of combustion. The first is very close to the sparkplug and the second just behind the induction pipe. The high power comeing from combustion in the first location. Your first Video shows, during warm-up, these two locations heating-up almost together. I’d very much like to see a video of the second motor variation during warm-up. Your changes to the induction pipe location and angle -
[quote="James D"]“I changed it because I felt that the incoming air was colliding together at too sharp an angle and not moving deep enough into the combustion chamber.â€
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ceramic version
Hey this is awesome, im definately going to have to build this from clay. The dimensions you posted where a little vague to me, can i get some with all the dimensions, so i know exactly what im doing?, that will be much appreciated!
i dont want to build a non working version again, then i will feel really stupid!
cheers
i dont want to build a non working version again, then i will feel really stupid!
cheers
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Re: ceramic version
James tells me that this motor is the last in this list:craigclavin wrote:Hey this is awesome, im definately going to have to build this from clay. The dimensions you posted where a little vague to me, can i get some with all the dimensions, so i know exactly what im doing?, that will be much appreciated!
i dont want to build a non working version again, then i will feel really stupid!
cheers
http://www.pulse-jets.com/phpbb2/download.php?id=8239
The induction pipes are 20.5mm dia.
Graham
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Re: ceramic version
Yes, it's true - I left out that all-important extra half millimetre in the drawing.Graham C. Williams wrote:James tells me that this motor is the last in this list:craigclavin wrote:Hey this is awesome, im definately going to have to build this from clay. The dimensions you posted where a little vague to me, can i get some with all the dimensions, so i know exactly what im doing?, that will be much appreciated!
i dont want to build a non working version again, then i will feel really stupid!
cheers
http://www.pulse-jets.com/phpbb2/download.php?id=8239
The induction pipes are 20.5mm dia.
Graham
Note that this is intended to be a scale drawing of these engines, with 1 pixel on the drawing = 1mm in real life. All dimensions are INSIDE dimensions.
James D - Yes, that is a fine shot. Someone not knowing what it is might guess that it's a slug of material in the middle of some exotic industrial process or something. Beautiful!
L Cottrill
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A shocking Motor?
Dear James D.
Your motor running at about 4.9Lbs Thrust looks something like this inside. This is just before induction.
As far as I can tell the event is 2 cells wide.
Graham.
Your motor running at about 4.9Lbs Thrust looks something like this inside. This is just before induction.
As far as I can tell the event is 2 cells wide.
Graham.
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- VIII Rev06 Gas Temp 4.9Lbs.jpg (18.03 KiB) Viewed 11755 times
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- VIII Rev06 Gas Pressure 4.9Lbs.jpg (15.04 KiB) Viewed 11755 times
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- VIII Rev06 Gas velocity 4.9Lbs.jpg (16.94 KiB) Viewed 11755 times
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?? Numbers ??
More information required!
I Know I am ignorant! But what do the numbers represent?
Jim
I Know I am ignorant! But what do the numbers represent?
Jim
WHAT TO FRAP, IT WORKED![url=callto://james.a.berquist][/url]
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By The Numbers
Jim -
Look at the Pressure graph - 1.0 would be one atmosphere, i.e. the outside air condition. Look at that low pressure spike - note that it coincides with the high velocity spike on the preceding graph. THAT is where the throat of the choke cone is in the engine length! Of course, the graphs just represent a "snapshot" of the speed, pressure and temperature along the length of the pipe at that moment. Think about the pressure distribution this shows for the front "half" of the engine (to the left of the choke cone pressure spike) - think that pipe is ready to breathe?
What happens in the pipe is almost magical, once you get the cone breaks located correctly, and the cones properly sized.
L Cottrill
Look at the Pressure graph - 1.0 would be one atmosphere, i.e. the outside air condition. Look at that low pressure spike - note that it coincides with the high velocity spike on the preceding graph. THAT is where the throat of the choke cone is in the engine length! Of course, the graphs just represent a "snapshot" of the speed, pressure and temperature along the length of the pipe at that moment. Think about the pressure distribution this shows for the front "half" of the engine (to the left of the choke cone pressure spike) - think that pipe is ready to breathe?
What happens in the pipe is almost magical, once you get the cone breaks located correctly, and the cones properly sized.
L Cottrill
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I have been having a hard time getting nudis to do much of anything other than really odd stuff. Sometimes I get non-function waves that form scribbles, like go forward, down, backwards, up, and forward again, or just have 3 waves so there are 3 y values for any given x, even after clearing the data files.
Even when I can get things to run smooth I wind up getting like -2lbs thrust from a 50 lb size engine, once I got a record breaking 2.3 lbs reading on a tp-180-70.
Maybe it doesnt like my computer.
Eric
Even when I can get things to run smooth I wind up getting like -2lbs thrust from a 50 lb size engine, once I got a record breaking 2.3 lbs reading on a tp-180-70.
Maybe it doesnt like my computer.
Eric
Graham, I must confess I've not even looked at nudis yet since I don't have Excel, however I'm going to try and get into it soon.
Here's a video clip, It seems to heat from the centre but I wonder if the front of the chamber is just being cooled from the incoming air.
James D
Graham wrote: The model shows this tailpipe design has 2 possible locations for the centre of combustion. The first is very close to the sparkplug and the second just behind the induction pipe. The high power comeing from combustion in the first location. Your first Video shows, during warm-up, these two locations heating-up almost together. I’d very much like to see a video of the second motor variation during warm-up.
Here's a video clip, It seems to heat from the centre but I wonder if the front of the chamber is just being cooled from the incoming air.
James D
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- twin.wmv
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Hi Craig, I was following your Ceramic Lady thread with great interest, If you do decide to build this I can post more dimensions, however I would suggest building an Advanced FWE mainly because its a good proven, simple design and also one of the most easy to start-up from cold.Craigcalvin wrote: Hey this is awesome, im definately going to have to build this from clay. The dimensions you posted where a little vague to me, can i get some with all the dimensions, so i know exactly what im doing?, that will be much appreciated!
James D
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Dear Eric.Eric wrote:I have been having a hard time getting nudis to do much of anything other than really odd stuff. Sometimes I get non-function waves that form scribbles, like go forward, down, backwards, up, and forward again, or just have 3 waves so there are 3 y values for any given x, even after clearing the data files.
Even when I can get things to run smooth I wind up getting like -2lbs thrust from a 50 lb size engine, once I got a record breaking 2.3 lbs reading on a tp-180-70.
Maybe it doesnt like my computer.
Eric
I've sent you an email containing a QSAV file I have of a thermpulse motor. Please get back to me and we'll see if there is a problem.
Graham.
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Re: ?? Numbers ??
Dear Jim.berquistj@peoplepc.com wrote:More information required!
What do the numbers represent?
Jim
The X axis is cells. 255 equally spaced cells along the length of the motor.
The Gas temp Graph Y axis is in Kelvin
The Pressure Graph Y axis is Bar.
The Gas Velocity Graph Y axis is Meters/Second
The approximate Cell Length for this motor is 2.7mm
Graham.
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do it!
Basic simple design and it's proven to run!
Jim
Jim
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Thanks James, Much appriciated. I agree it certainly seems to heat from the centre.James D wrote: Here's a video clip, It seems to heat from the centre but I wonder if the front of the chamber is just being cooled from the incoming air.
James D
Graham.
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light. Productions begin.
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