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Be careful if you are using NH4NO3 in conjunction with copper or brass, like in a fuel line. I remembered reading something about it forming dangerous compounds with each metal. So I looked it up in The Chemistry Of Powder and Explosives and shure enough it can undergo a double decomposition reactio...

Ha Ha! I fixed my big putt putt with silicone " thanks Lockblade" and I figured out a way to get it to keep running. Remeber in my post I said that I was able to deal with the vapor lock problem by having the engine below the water levle, and then I ran into the problem of it ingesting too much wate...

You could go on tour with that thing. Opening up for monster trucks as a kind of freak show! Very nice!

Hay people; thanks for all of the input. I'm sorry for any confusion that I may have caused by my questions. As I read through my post and everybodies replies I can see that I wasn't completely clear about a few things. So if anbody is interested I will try to shed some light on where I'm going. Fir...

I was up last night tossing and turning in bed for about three hours thinking about pulse jets, of all things. Any ways I came up with some good ideas and I was wondering if anybody could help me out with a few things. My first question is, does anybody know at what cylinder pressure a car engine st...

Larry Cottrill wrote: Is there any chance that larger ones don't work just because it's impossible to keep a liquid lock against the vapor, ... Bigger ones do work with some simple tricks I made a much larger simple putt putt engine. It is about 24" total length with the boiler 3 1/2" x 10". They do...

Mark and Steve; Thanks for the input on the spark plugs. I am realatively new to pulse jets and your help will be put to good use. It seems that every time have come up with an idea and I go to the hardware store they have nothing I need and everything I don't. So as you can see a little direction g...

Mark; This is off the topic of jam jars, but going through the forum I saw the valvleless engine you made and I was just wondering what was the brand and size of the sparkplug you used and the pipe fitting that it goes in. I'm hoping to find a spark plug that is already the right thread to go into a...

Anthony; Do you know if anybody has made an engine like this? I have had some similar thoughts. It makes sense to combine a ram jet with a pulse jet, kind of like a "pulse cumbustion ram jet" so that it can get up to speed and get good compression. Acording to Bruce Simpson's numbers his 50 lb lockw...

Who are you saying is addicted to jam jars? Not ME! My wife was already considering buying me some extra HEET when she went to Wal-Mart the other day. It is that bad! Anyway I think I'm going to try to lip feed a propane bottle with the heated propane to see what happens. It may be a while beffor I ...

Hay Mark ; I bought some Heet and boy what a difference it made. First let me say you where right about the can it never worked. Next I tried using a small mouth 1quart masson jar with a hole that was about 1/2". It works like a charm starts up almost everytime and goes until it breaks or burns all ...

Mark; thanks for the input with the jam jars. I'm going to go to wallmart after work and get some methanol. I was wondering if the walls of a can where a little weak. I guess so. A propane tank sounds like a good idea my only question is do you need to drill out the valve and plug it up, or does it ...

:) Go with the sugar and KNO3 I have had quite a bit experiance with working with the traditional blackpowder and the sugar, KNO3 engines. Yes the sucrose propellant is a bit slower but that is no problem if you just increase the core depth. If you use a ratio of about 70 parts KNO3 and 30 parts suc...

I've made a jam jar combuster with limited results. I used the same dimensions that another member used with good results except i jused used a tin can. My combuster will only run for a second or two and I am wondering if it is the fuel that I am using. I've been using isopropyl and it sounds just l...