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Welcome Newbs! I sure hope you find a usable 2d cfd code. How hard could it be?? Ha We definitely had fun with 1d uflow and nudis, but something more appropriate is needed. It is too much to expect I suppose to have freeware that would run pulsating combustion events, but I wait patiently. Happy pul...

We may be wondering: Why, Mike, Why? Well, reasoning goes like this: I don't want a big horribly loud motor that wriggles my gizzards to push me around if I can create some mechanical advantage with a smaller one. I could technically push myself around with this 5 lb thrust, but it would not tolerat...

yeah, this is a fun one, Mark. With the skate wheel driving the side of the bike wheel, it will be a bout 1700 RPM per 10 MPH. I think it should take the heat, and part of it is going to be pumping cool air, so maybe it won't get as hot as I fear. I got the right angle gearheads today. Pretty beefy....

You know, once you let go of any dreams of high performance pushing a bike around with 5 lb of thrust, the problem opens up and gets really fun. Doing some math, I realized that making a larger diameter free turbine gets me very little. My original thought was that the thrust acting on a bigger radi...

Hi Ganesh, fuel is propane and i will post a pic of the fueling.
My motors are bent into a “u”. Do you need a straight or can you do the bent version?

Hi Zono and Ganesh, I'd like very much to know if this motor's intake and exhaust alternate. I'm about to put it to a turbine and in or out of phase is important. Any interest in running this geometry? I'm imagining test rigs to find out, but thought you guys would enjoy the idea. pocket jet, 3.5 lb...

Ah yessss, pushbutton starting works! 8AFD2B88-BCD7-4CE0-84AF-98E36625D9DB.jpeg I’ll get a youtube up of the successful result. I ran out of fittings, so decided to try a direct line to the starting stinger, and adjusting the needle valve going to the main feed. The next iteration needs ability to s...

Wouldn’t hurt to put an X rib on any big areas. You will wish you’d spent just a bit more on 304 or 321. I llok at some of my prototypes and wish I’d let go of mild steel much earlier. I’ve given the rectangular architecture a lot of thought and modeling, but no gas dynamic, stress or fatigue work, ...

Drilling pinholes will be a hot topic if I have the glass blowers blow me a pocket jet. I would like to preserve the fueling I use, which will be tricky in quartz. Thinking laser.

Oh yeah, I suppose we did talk about this http://www.pulse-jets.com/phpbb3/viewtopic.php?f=3&t=4190&hilit=chicken+drive&start=15#p59619 I think I'm favoring the simple free turbine idea better now. I can imagine the Coriolis and centrifugal forces going on are going to massively hurt flow on the "sp...

IDK. I know it’s not a guessing or cut and try game though. There are governing gas dynamic principles you need to observe. Ones I do not know and have not researched.

I’m going to make a plastic guide and see if I can cut it net size. The wire should make a nice finish if guided properly.

Hey Nick, hope all is well! Need to come out there in '19 for sure. I'd like to see this one too as it's been percolating for a long time, so am laying in some supplies. But anyone that reads this thread knows I'm all talk until I am not! I've had to scale back on work a bit for my sanity, so am ima...

So I've got this notion to make a PJ powered bike out of a 1L pocket jet I have. Just go for a simple free turbine and gear it all down. I do not care about how fast I go, gearing it for 10-15ish MPH(?), assuming 100m/sec achievable tangential velocity(?) I do not have any interest in using a PJ big...