Russian inlets

[Mike Everman]

That is so cool, ha ha thanks for that!

[Irvine.J]

Sounds like a revved up scooter old guys ride HAHAHAH. ROFL

[GRIM]

Heres a fun vid ,

The first thing that calls attention to me , is the state of my backyard,
must make a mental note to have a word with my wife about that ,

Noteworthy might be the fact that I estimate 80% of the thrust is coming from the inlet , but that’s not surprising considering the length and diameter of the tailpipe.

I will do something similar once I put the straight inlet back on , to compare ,

You know how one idea leads to another, washing lines and all,

I remembered that my mother had a washing line that was triangular and would spin around a central post ,

That little neuron caused an acid flashback,

Many years ago I had An electric rig called Round the pole ,
It involved small electric foam planes flying around a central post , the current ran through 2 small ball races, and thence to the airplane via 2 wires,
From what I remember the “craft” doesn’t have to be anything at all elaborate , centrifugal force plays a huge role here in getting even horrendous airframes into the air ,

Now taking things a step further ;
A 2” diameter steel pipe concreted into the ground about 5ft tall, with a rotary union for the gas , and maybe 30 ft lines, Might be a (frightening but fun) way of getting some engine/airframe testing done before the shit or bust ramp launch routine,
One could even put r/c gear in the craft for elevator control ,

Hmm I can feel a winter project coming on ,

And by the way if anyone here has a mother who has a triangular washing line , I accept no responsibility whatsoever for any potentially lethal fun you might have,

BTW the places that sell pneumatic valves and cylinders , also keep rotary unions,

[Jim Berquist]

God! James is right! It sounds like a MoPed!

[Jim Berquist]

Here You Go Grim! Your Next Step!


Note: No Pantent Required.

[larry cottrill]

Both Jim's drawing and the videos are hilarious!

"But I just had to la-haff
I saw the photogra-haff"

L Cottrill

[GRIM]

This should really make the washing line whiz round, Less moped, more ricer 4 pot at idle,

I had to keep the revs down , “Her indoors” was home,

Jim the drawing is brilliant,

The film is one of my favorites , they are east enders , and yes they really do speak like that, you tube it , there’s some good clips ,

I come from the other side of the river , similar accent but slightly toned down,

“ I told you to blow the bloody doors off ”

[Irvine.J]

Thats a big trombone!

[GRIM]

I believe that some of the “wind” musical instruments do indeed have something in common with pulsejets with their resonant nature,

I always think of them penny whistles, simply covering or uncovering one or more small holes, in essentially a straight tube will produce a totally different frequency , could be that’s why one should take care to keep all the welds airtight,

Some small holes in strategic places with little stoppers, Could be a way of tuning an engine maybe ha,

[GRIM]

I apologize in advance if I am boring you , heres another vid , and a couple of photos

The big difference is that the tailpipe is only 23 “ long now , making an overall length of 27” so I guess it is a real pulsejet that can jam jar , its running at about ¾ throttle here ,
I surprised myself , prior to shutdown I tried to flame it out and discovered there is a bunch more throttle once really hot ,

I have also modified the shape of the inlet , the cone is shorter now ,

[larry cottrill]

Man, I really like this! Beautiful!

It seems to throw sparks from a place where there isn't supposed to be an aperture ;-) Great work, nonetheless.

L Cottrill