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jenniferhoops wrote:Hello pulsejetter,

I must say you have done a good job. Happy to see that you have finished your work.

Thanks, i should really upload a video sometime.

Great thanks for everyones help on providing a simlple calculation for predicting the amount of thrust theoretically.

I would say that the 1.2lbs per inch squared of combustion chamber diameter sounds about right as many people haven't really achieved the 55lbs of thrust that the design is claiming. So 40lbs sounds more realistic/ the types of figure many are getting. I would've thought that the combustion chamber ...

Average diameter is 169mm, take that times 0.03937 to get 6.65 inches in diameter. to find area of 6.65" circle= pi times radius squared= 3.14*(6.65/2)squared=34.71 area a few rounding errors, but close yes? now 1.2 times 34.77= 41.72lbs. then 41.72lbs divided by 55 lbs rating = .7585 = approx. 76%...

pulsejetter, Did the plans specify a chamber of 237mm cylinder, or a 160mm-178mm cone type chamber? It looks like the cone type, if so that would average to about 169mm. Roughly 34.77 square inch area. 1.2 x 34.77=41.72 maybe 41.72 pounds? That would be 76% Yes it's the cone type with one end of th...

Thanks very much for the info provided so far. From the kentifield graph system which was in the link, it indicates that for my Lockwood hiller pulsejet the maximum theoretical thrust is around 80lbs yet the engine is listed as a 55lbs design. Does this calculation/ rule of thumb calculation not wor...

For some basic thrust guestimates I think you can use Pyro's recipe for beginners. If you wan't a more acurate acount of what's going on, try either NuDIS or Uflow1D. Nudis has a rather steep learning curve and can not distinguish between random errors created by the buggy excel program or by a poo...

Hi all, as you may know i have built a Lockwood Hiller pulsejet and posted pics of it completed and some info. I was wondering if there are any calculations to predict the thrust from the size of the combustion chamber or anything like that? Also are there any other calculations which could be used ...

Looking good, Happy to hear the crimped and drilled method worked and many thanks for the details on the location. What diameter were the 6 small holes? Thanks. I'll have to get back to you on that, not really sure, just a small drill bit i had, i would say 3mm. I either put 6 or 8 holes in, fairly...

Here are some pictures of the finished pulsejet. Might include some build pics later on.

Just thought that i'd post on here and say i built the lockwood hiller valveless pulsejet from plans found on the internet, used copper pipe as said above which is basically the same configuration as Dang911's pulsejet as i have a vapourisation or pre-heat coil if i choose to invert the propane tank...

Mike Everman wrote:The answer is yes. The video link I posted shows exactly that, on a big one, but the method is the same. Just try, you'll see in short order what to do.

Great thanks for the answer and the link. I'll be going down to see if it can be done on saturday, so fingers crossed.

Thanks.

Thanks everyone for the links and videos etc.
But i did ask if you can roll cones in a normal slip roller as would be found in most engineering workshops?
Or is a taper roller needed?

Because i'd rather get them rolled on a slip roller than by hand tbh, i will be welding them though.

Thanks.

Radial injector by Dang911 towards the bottom of the page. http://www.pulse-jets.com/phpbb3/viewtopic.php?f=3&t=2885&hilit=lockwood+startup Advanced injector by Eric also at the bottom of the page. Lockwoods typically require alot of starting air, and are difficult for a first engine. Great thanks ...

Thanks for the reply.
Is that how most people form their pulsejets then?
This engineer place has a slip roller but says he cannot do the cones or the exhaust etc, is it possible to do cones on a normal slip roller?

Thanks.