Search found 1861 matches
- Fri Feb 26, 2010 4:40 pm
- Forum: Off topic forum
- Topic: freak snow
- Replies: 109
- Views: 59126
Re: freak snow
I cant find my car, I think its one of three drifts in the parking lot.
- Mon Feb 22, 2010 3:25 am
- Forum: Valveless pulsejet forum
- Topic: More free plans: 40 pound Chinese
- Replies: 192
- Views: 824962
Re: More free plans: 40 pound Thermojet
How are you estimating the thrust for your designs? Are you recycling the parts from the non working one? Any way to turn it into a linear engine? Think you might learn a lot how a design works in linear mode, and how it applies to the rear facing intake types. Plus the linear layout is really easy ...
- Wed Feb 17, 2010 11:42 pm
- Forum: Valveless pulsejet forum
- Topic: Just made a Advanced Focused Wave Engine cant keep it going
- Replies: 32
- Views: 24919
Re: Just made a Advanced Focused Wave Engine cant keep it going
Nice build Bix.
Slip rolls are not good for small sizes, and can not roll 99% of pulsejet cones. If you buy one you will still have to roll cones by hand.
Slip rolls are not good for small sizes, and can not roll 99% of pulsejet cones. If you buy one you will still have to roll cones by hand.
- Tue Feb 16, 2010 2:39 am
- Forum: Valveless pulsejet forum
- Topic: Just made a Advanced Focused Wave Engine cant keep it going
- Replies: 32
- Views: 24919
Re: Just made a Advanced Focused Wave Engine cant keep it going
Flattening the tip will help, and holding it in a constant position is a must, if it moves around before it starts it might not ever get to the point where it can stabilize and keep going.
Depends on how much it leaks, if you can patch the leaks it would help a lot I'm sure.
Depends on how much it leaks, if you can patch the leaks it would help a lot I'm sure.
- Thu Feb 04, 2010 2:56 pm
- Forum: Valveless pulsejet forum
- Topic: Technical difficulties out in the sticks
- Replies: 1
- Views: 3041
Technical difficulties out in the sticks
Hey Everyone if you need to contact me I will keep an eye on the forum pm box. My forum seems to have been phpbb attacked and can't fix it any time soon. The new shop is great for fabrication unfortunately it's difficult to run an online business without Internet Everything is basically going throug...
- Thu Feb 04, 2010 2:52 pm
- Forum: Valveless pulsejet forum
- Topic: Technical difficulties out in the sticks
- Replies: 0
- Views: 3547
Technical difficulties out in the sticks
Hey Everyone if you need to contact me I will keep an eye on the forum pm box. My forum seems to have been phpbb attacked and can't fix it any time soon. The new shop is great for fabrication unfortunately it's difficult to run an online business without Internet Everything is basically going throug...
- Tue Jan 26, 2010 6:42 pm
- Forum: Valveless pulsejet forum
- Topic: first ever pulse jet not running
- Replies: 7
- Views: 7568
Re: first ever pulse jet not running
Hey everyone, unfortunately can't get Internet at the new shop so we've been stuck using an iPhone for calls and Internet
those dimensions may work somewhat with great difficulty
you can get the plans on our site still at beck-technologies.com/freeplans.HTML
good luck
those dimensions may work somewhat with great difficulty
you can get the plans on our site still at beck-technologies.com/freeplans.HTML
good luck
- Mon Dec 21, 2009 2:42 am
- Forum: Valveless pulsejet forum
- Topic: Trying again: 40-ish pound thermojet plans.
- Replies: 2
- Views: 4147
Re: Trying again: 40-ish pound thermojet plans.
I'd say about 17.25 lbs with short intake, less with long.
- Mon Oct 26, 2009 3:41 am
- Forum: Valved pulsejet forum
- Topic: Pulse-Jet Operating Frequency Variations
- Replies: 13
- Views: 15945
Re: Pulse-Jet Operating Frequency Variations
Yes it is harmonically driven, and I suspect it happens in all pulsejets, its just a matter of wether or not its on a scale that can be measured. Im not sure if your question is something that can be answered, even if you had perfectly controlled steady conditions, running the engine would destroy t...
- Sun Oct 25, 2009 12:30 am
- Forum: Valveless pulsejet forum
- Topic: Non-continious fuel injection
- Replies: 9
- Views: 12595
Re: Non-continious fuel injection
I just made a post in the valved section on one of SR's threads, about natural frequency variation and modulation. Yes you could force the engine to run in a way that it does not like to some extent, the frequency of the engine actually changes along with the magnitude in a harmonic fashion all by i...
- Sun Oct 25, 2009 12:03 am
- Forum: Valved pulsejet forum
- Topic: Pulse-Jet Operating Frequency Variations
- Replies: 13
- Views: 15945
Re: Pulse-Jet Operating Frequency Variations
Statistically there wouldn't be that much variation over one second with normal running at a set throttle, but most engines have a pulsation magnitude frequency where the thrust may go from a relative minimum to relative maximum 10 times a second. Say like a 4.75 lb engine going from 4.5 lbs to 5 lb...
- Sat Oct 24, 2009 5:32 pm
- Forum: Valved pulsejet forum
- Topic: Pulse-Jet Operating Frequency Variations
- Replies: 13
- Views: 15945
Re: Pulse-Jet Operating Frequency Variations
It varies by fuel, atmospheric temp, and air speed. In controlled experiments you wont see much variation, but otherwise you will see a +/- 5% shift in frequency depending on conditions. I never got around to releasing my pulsejet calc 2.0 which graphs the frequency range under a number of condition...
- Sat Oct 24, 2009 5:26 pm
- Forum: Valveless pulsejet forum
- Topic: Non-continious fuel injection
- Replies: 9
- Views: 12595
Re: Non-continious fuel injection
Somewhere on one of my hard drives I do, look around the forum here, pretty sure mike posted some of them a while back.
Expected aspects of the technology? Not trying to make a PDE are you?
Expected aspects of the technology? Not trying to make a PDE are you?
- Sat Oct 24, 2009 1:25 pm
- Forum: Valveless pulsejet forum
- Topic: Non-continious fuel injection
- Replies: 9
- Views: 12595
Re: Non-continious fuel injection
While the end results are no doubt better than continuous injection, they make a lot of assumptions in that paper, and display things in a disingenuous way. Saying the thermal efficiency is increased by a factor of 7, along with a 30% margin of error doesnt tell you anything specific about the engin...
- Thu Oct 22, 2009 5:28 pm
- Forum: Valved pulsejet forum
- Topic: Hello and questions
- Replies: 15
- Views: 14690
Re: Hello and questions
What fuel are you planning on running it on, if you run it on pure methanol sprayed in the intake, it will give you extremely cold dense fuel air charges without any need to cool the valve system. If you then add water injection in the chamber you could then get even more of a boost, but water injec...