Search found 58 matches

by sockmonkey
Sun May 29, 2016 6:52 am
Forum: Tools and Construction
Topic: Reinforcing high-temperature materials
Replies: 0
Views: 663

Reinforcing high-temperature materials

I've seen various ideas bandied about on here for using ceramics or other refractory materials for a pulse-jet body, but the sticking issue was always structural strength. Other materials suggested for reinforcements seem either a bit pricey or hard to come by. Could fine tungsten wire be used like ...
by sockmonkey
Mon May 16, 2016 5:24 pm
Forum: Valveless pulsejet forum
Topic: Reynst pot help
Replies: 49
Views: 6736

Re: Reynst pot help

Say you made the "bottom" of the combustion chamber double-walled to serve as a preheating chamber for the fuel with pinholes in the inner wall to let it into the chamber.
Image
by sockmonkey
Tue May 10, 2016 4:42 am
Forum: Valved pulsejet forum
Topic: Rotary valves do not work.
Replies: 4
Views: 2121

Re: Rotary valves do not work.

Oh, what if the fuel injector was controlled by the rotary valve? Then the timing of the explosion would have to match the valve's opening and closing because that's when the fuel would show up.
by sockmonkey
Sun Dec 07, 2014 12:10 pm
Forum: Valveless pulsejet forum
Topic: Internal circulation-directing structures.
Replies: 0
Views: 1157

Internal circulation-directing structures.

I'm told that adding an internal cone to a reynst type pulsejet improves the mixing and efficiency.
Would adding some sort of internal guide structure help in other designs as well?
It's my understanding that a reynst operates similar to the Chinese only in annular form, but what about say, Lockwoods?
by sockmonkey
Fri Nov 28, 2014 11:43 pm
Forum: Ramjet forum
Topic: "Flat" Ramjets as in Fleissners Patent, feasability?
Replies: 15
Views: 8108

Re: "Flat" Ramjets as in Fleissners Patent, feasability?

That make a depressing amount of sense.
by sockmonkey
Wed Nov 26, 2014 5:41 am
Forum: Ramjet forum
Topic: "Flat" Ramjets as in Fleissners Patent, feasability?
Replies: 15
Views: 8108

Re: "Flat" Ramjets as in Fleissners Patent, feasability?

Hmm, what's the equation for calculating centrifugal force at rotor blade tips?
by sockmonkey
Wed Nov 26, 2014 4:59 am
Forum: Valveless pulsejet forum
Topic: Wanted: plans for a 10-20Lb valveless PJ
Replies: 16
Views: 4491

Re: Wanted: plans for a 10-20Lb valveless PJ

At least it should provide some useful data.
by sockmonkey
Sat Nov 22, 2014 7:32 am
Forum: Ramjet forum
Topic: "Flat" Ramjets as in Fleissners Patent, feasability?
Replies: 15
Views: 8108

Re: "Flat" Ramjets as in Fleissners Patent, feasability?

I'm reminded of that patent for a tip-ramjet helicopter rotor where the air intake was in the hub with hollow tubes leading to the jets at the tips. The centrifugal force was used to suck the air in and compress it before it got to the jets. Sounds good in theory. Is there any reason it wouldn't work?
by sockmonkey
Sat Nov 22, 2014 6:55 am
Forum: Valved pulsejet forum
Topic: Rotary valves do not work.
Replies: 4
Views: 2121

Re: Rotary valves do not work.

You might get away with rotary or other externally actuated valves if it were a very large pulsejet since the bigger ones operate at much lower frequencies.
by sockmonkey
Fri Jul 25, 2014 6:02 pm
Forum: Valveless pulsejet forum
Topic: Blast Compression Intake proposed design
Replies: 78
Views: 32288

Re: Blast Compression Intake proposed design

tufty wrote:This paper, for example references a good number of names familiar around here, and a few unknowns - apparently a chap named "Ogorolec" has done some work on pulsejets, can't say I've ever come across him.
I'm quite certain he's just a myth. :wink:
by sockmonkey
Mon Jul 07, 2014 5:54 am
Forum: Unconventional, Multi-Mode and Hybrid Jets
Topic: Turbo cylinder?
Replies: 10
Views: 6982

Re: Turbo cylinder?

Indeed. The cylinder assembly wouldn't be nearly as heavy as that of a turbocharged piston engine though since the lack of moving pistons or a crankshaft means that not only will it be much smaller, it also doesn't need to cope with the mechanical stresses caused by having to keep all those parts on...
by sockmonkey
Thu Jul 03, 2014 4:58 pm
Forum: Unconventional, Multi-Mode and Hybrid Jets
Topic: Turbo cylinder?
Replies: 10
Views: 6982

Re: Turbo cylinder?

Yeah, a plenum chamber on this thing could also function as an intercooler for the compressed intake air.
The animation does use two combustion chambers and between cycles the intake air blows right through to the exhaust turbine both for scavenging and cooling.
by sockmonkey
Thu Jul 03, 2014 9:30 am
Forum: Unconventional, Multi-Mode and Hybrid Jets
Topic: Turbo cylinder?
Replies: 10
Views: 6982

Re: Turbo cylinder?

Hmm, good points there. What about multiple combustion chambers so there is always at least one providing thrust and another taking in fresh air from the turbine?
How do normal turbochargers handle the intermittent intake and exhaust pressures? Is it just by the length or the tubing in the manifold?
by sockmonkey
Sun Feb 02, 2014 11:00 pm
Forum: Valveless pulsejet forum
Topic: M500 build log
Replies: 161
Views: 42543

Re: M500 build log

I have high hopes for this. I remember from some of the literature on here that thermojets generally work best when built nice and big like you're doing.
by sockmonkey
Tue Jan 28, 2014 3:42 am
Forum: Ramjet forum
Topic: Pulsejet-ram combo
Replies: 6
Views: 2465

Re: Pulsejet-ram combo

I have since learned that what I proposed is called the Merideth Effect. WWII planes like the P-51 Mustang employed it by making use of the waste heat from the radiator to generate several hundred pounds of thrust from the exhaust duct. So at least I know the principal is sound. http://en.wikipedia....