Search found 46 matches

by matt512s
Sun Sep 06, 2009 11:41 pm
Forum: Valveless pulsejet forum
Topic: Solving Thermosteel fragility problem
Replies: 9
Views: 2627

Re: Solving Thermosteel fragility problem

Hi; I must confess my proposal is based on the assumption that thermosteel has similar expansion characteristics to steel. I have not researched this as fully as perhaps I should have. My intent was to suggest an approach that might not have been considered. I recognize that fabrication may be more ...
by matt512s
Sun Sep 06, 2009 6:45 pm
Forum: Valveless pulsejet forum
Topic: Solving Thermosteel fragility problem
Replies: 9
Views: 2627

Re: Solving Thermosteel fragility problem

Hi;
My proposal is not to actually use cement or concrete, but to use a similar reinforcement mat system
infiltrated with thermosteel. The mat system provides the ductility.
by matt512s
Sun Sep 06, 2009 1:22 pm
Forum: Valveless pulsejet forum
Topic: Solving Thermosteel fragility problem
Replies: 9
Views: 2627

Solving Thermosteel fragility problem

Hi All; I believe I have a solution for the brittle nature of thermosteel. The concrete industry has developed a method of reinforcement called micro reinforced cement. It consists of staggered layers of welded wire mesh (think hardware cloth) tied together to form a 3-D reinforcing mat. When infilt...
by matt512s
Thu Aug 20, 2009 10:29 pm
Forum: Valveless pulsejet forum
Topic: Alternative Technologies plans
Replies: 2
Views: 1271

Alternative Technologies plans

Hi, All: On the Alternative Technologies website, a number of jet engine plans are offered for sale. The one that puzzles me is the so-called "Round Jet Engine". I can not tell from the description if this is a ramjet, a valveless pulsejet or something else. Does anyone have info as to what this is ...
by matt512s
Mon Jun 22, 2009 12:04 am
Forum: Unconventional, Multi-Mode and Hybrid Jets
Topic: Pulse jet driven tip turbine fan
Replies: 4
Views: 4042

Re: Pulse jet driven tip turbine fan

Hi; \ The patent is #4051671 and can be found on freepatentsonline.com. The suction driven tip turbine I refer to are turbine blades mounted on the outer rim of the fan, rather than downstream of the combustor. Instead of using combustion gases to drive the turbine (which in turn drives the fan), th...
by matt512s
Sun Jun 14, 2009 2:08 pm
Forum: Unconventional, Multi-Mode and Hybrid Jets
Topic: Pulse jet driven tip turbine fan
Replies: 4
Views: 4042

Pulse jet driven tip turbine fan

Hi All: I haven't written for some time, but I think I have come up with something. After reading a patent on a suction tip turbine driven turbojet, it occured to me that such a device could be driven by a pulsejet. The fan tip turbine scroll would be connected by ducts to a pulsejet augmentor. The ...
by matt512s
Fri Feb 02, 2007 5:17 pm
Forum: Gas turbine forum
Topic: Turbcraft P-38B: Engine or Paperweight?
Replies: 10
Views: 9146

Turbocraft P-38

Hi; The P-38 plans are great, and I already see modifications that could be made. A smoother flowpath, bigger rotors to reduce rpms, more blades on the rotors and stators and film cooled combustor tubes (I saw those on Free Patents Online. Also more robust bearings so the engine could be run for ext...
by matt512s
Mon Aug 07, 2006 12:08 am
Forum: Valveless pulsejet forum
Topic: failed attempt at FWE build from kit
Replies: 9
Views: 3902

re: failed attempt at FWE build from kit

Hi! Outstanding! There is hope for those of us without metalworking and welding skills! What was the product you used, and do you know if I can get it in the States? Best Wishes: Matt
by matt512s
Wed Aug 02, 2006 4:10 pm
Forum: Gas turbine forum
Topic: Turbcraft P-38B: Engine or Paperweight?
Replies: 10
Views: 9146

Turbcraft P-38B: Engine or Paperweight?

Hi All; There seem to be a number of sites selling plans for the Turbocraft P-38 axial turbojet. Given the near-universal inability to get their U-22 turbojet to work, is this one any better? I find the claims of 20 lbs thrust to be highly suspicious. Is this another case of a elaborate paperweight?...
by matt512s
Mon Jul 17, 2006 10:36 pm
Forum: Gas turbine forum
Topic: Gas (Tesla) Turbine started
Replies: 80
Views: 58652

re: Gas (Tesla) Turbine started

Hi Nick: Beautiful build! I just wrote to clarify that the combustor patent I referenced is NOT a pulse combustor. It is a miniature liquid-fueled combustion chamber in which the fuel is injected and forms a film on the interior walls. This serves to help vaporize the fuel and confine the combustion...
by matt512s
Fri Jul 14, 2006 4:12 pm
Forum: Gas turbine forum
Topic: Gas (Tesla) Turbine started
Replies: 80
Views: 58652

re: Gas (Tesla) Turbine started

Hi Nick! I have found a new combustor design that might work for your project. Check out US patent 6877978. If it works as advertised, it is absurdly simple and absurdly powerful. Best Wishes: Matt
by matt512s
Wed Jul 12, 2006 10:39 pm
Forum: Gas turbine forum
Topic: Gas (Tesla) Turbine started
Replies: 80
Views: 58652

re: Gas (Tesla) Turbine started

Hi Nick; I am working on some drawings now for my engine concept, and am proceeding from the turbine assembly outward. The idea is to make each assembly a module that can be swapped out without junking the entire engine. As soon as I complete the drawings (which may be a while), I hope to post them ...
by matt512s
Tue Jul 11, 2006 9:52 pm
Forum: Gas turbine forum
Topic: Gas (Tesla) Turbine started
Replies: 80
Views: 58652

re: Gas (Tesla) Turbine started

Hi Nick! By a staggering coincidence, I have been kicking a similar idea around. You, however, are way ahead of me by actually building something! I also am planning to build a low-temp test rig to verify the concept. My turbine differs from yours in having multiple inlet nozzles. From what I have r...
by matt512s
Thu Jun 29, 2006 11:02 pm
Forum: Valveless pulsejet forum
Topic: Pulsejet internal pressure
Replies: 9
Views: 4630

Pulsejet internal pressure

Hi! Was just wondering how high the pressure pulses average inside a valveless. Does it depend on the type?, The size?, The fuel?, All of the above? Is there a formula for determining the internal pressure in psi? I am specifically interested in the Reynst style combustor. Thanks; Matt
by matt512s
Wed Oct 26, 2005 11:05 pm
Forum: Valveless pulsejet forum
Topic: Ye old help the noob post
Replies: 9
Views: 3459

re: Ye old help the noob post

Hi:
Do Mr. Tharratt's formulas apply to a Reynst style combustor
as well? If so, does the length include the resonator?
Best Wishes;
Matt