Pulse » jet

Advanced FWE Pulse Jet Starting Tutorial

admin — Wed, 30 Jun 2010 01:17:23 +0000

A different version of the advanced FWE valveless pulsejet tutorial. These little engines are available on ebay.

The engine is a valveless pulsejet with no moving parts, and easily self starts on propane, just turn on the ignition and turn on the fuel….

A valveless pulsejet is a unique type of engine with no moving parts. Unlike ramjets, which must have air blown into them at high speed, either by a blower or by traveling very fast, pulsejets can run while completely still.

They can be throttled typically between 10% and 100% thrust in the blink of an eye, and dont require any spool up time like turbines or turbojets.

Because they have no moving parts, valveless pulse jets are much easier to own and operate than RC turbines. For the cost of a ducted fan setup, you could have your own real, high speed RC jet plane.

The truth is that by the time you add up turbojet planes engine weight, fuel and oil pump weight, the computerized control system, and any onboard starting systems, you not only have a small fortune invested in the plane, but its also quite heavy. Pulsejets can be made extremely light weight, and even valveless engines are capable of pumping their own liquid fuels by the venturi effect. All you then need is your standard reciever and servos and a small battery to power it, rather than a large battery to power a fuel pump.

Duration : 0:5:42

[youtube IEzFOwP_GY4]

5 lb Thrust Pulse Jet Engine with Dyna Jet Red Head.

admin — Thu, 27 May 2010 03:46:24 +0000

Pulse Jet with Dyna Jet Red Head running on Propane produces 5 lbs of thrust on the test stand. I used the German V1 research data to design the combustion chamber, cone and tail pipe of this engine. I used college research date written by 3 different students in 3 different colleges to make other changes. Research data says, a longer tail pipe produces more kenetic energy causing the engine to take in a larger volume in air and fuel and this will increase the thrust. I ran the engine several times on propane and made several changes to the fuel orfice. Then I took this video which is probably the 8th or 9th test run. This engine is 50% throttable and it is running amost full power for about 2 minutes in the video then. I turned down the fuel pressure until the engine stopped. The original Dyna Jet Head and reed valves were used in the engine. Total run time so far about 60 minutes. The engine is running on propane which produced about 97% of the power of gasoline but propane is a lot easier to regulate. The best part about this design is the lower combustion chamber compression ratio does very little damage to the reed valves. The German pulse jet design is not suppose to produce more thrust it increases the reed valve life to a minimum of 1 hour. Some of the German reed valves lasted for 24 hrs in a static test run. The longer tail pipe also helps to suck the combustion chamber flame away from the reed valves to keep them from getting hot. The engine is running on 8 lbs of propane and can be throttled from 5 lbs to 10 lbs. 10 lbs is the pressure it will need in flight 200 mph ram air will make it run with the correct air fuel mixture. If I increase the fuel orfice diameter the engine will run on less fuel pressure. If I double the area of the fuel jet the engine will run on 4 psi and if I double the fuel jet size again the engine will run on 2 psi propane. It runs on gasoline and alcohol too.

Duration : 0:2:55

[youtube QkOR8IZPsFg]

Dreadnough pulse-jet V1.02

admin — Sat, 22 May 2010 04:05:31 +0000

Here’s a new dreadnough video. There have been some changes since last time. After some inspection on the reflector on the t100, I found a tear. this was not a weld that had buckled but just a tear in normal steel, caused by massive pressure waves bouncing against it back into the cc. After some discussion with James, we decided to replace the not very well tuned divergant/ reflector aray with a straight pipe and test it again with the prommise of a massive thrust increase. This meant I had to get some new steel. unfortunately, I could only find .7 mm. “Should be fine” I ponderd and started construction. The first test was a failure. the lack of pressure waves comming back into the cc meant I had much more trouble starting it. For the second attempt, James adviced to put a wet rag on a stick into one of the intakes to provide the extra pressure needed for starting. This worked fine as the video shows. One small thing though. I REALY should not have used .7 mm:P The entire rectifier buckled, warped and ripped under the pressure! but before it did so, it put out massive amounts of power, much more then it did before so the change ws a succes!. just need to remember to use 1mm stainless next time

Duration : 0:0:40

[youtube 1pw8u73Wzc4]

HOW TO make a jam jar pulse jet THAT WORKS

admin — Fri, 07 May 2010 20:21:20 +0000

HOW TO make a jam jar pulse jet engine ( reynst )THAT WORKS. What Fuel? What jar? How big should the hole be? One hole or two? Safety.

Duration : 0:1:0

[youtube AePLpM5SnqE]

Pulse Jet FWE VIII Type07 startup and heat development

admin — Fri, 16 Apr 2010 14:32:25 +0000

A nice view from the top during the starting and transition phase. Notice the way the temperature increases down the length of the motor. Finally a dramatic flame-out at the end of the video. The two induction pipes stay cold and the last third of the conical tailpipe stays cold too. No mechanical valves in these motors. It is the plugs of cold air in both the tailpipe and the induction pipes that allow pressure build in the combustion region; the cold, high density air has a lot of momentum and confines the combustion allowing pressure to increase. Finally, the ejection of these cold plugs is largely responsible for the motors thrust. Unlike the Turbojet these motors are non-steady pressure gain combustors.

Duration : 0:1:24

[youtube OD39FQJMFeY]

Pulse jet go kart for sale!!!! -SOLD

admin — Tue, 13 Apr 2010 12:10:01 +0000

This engine is sold.

Duration : 0:0:26

[youtube 5U-grFuXZ9U]

New Russian Pulse Jet Engine

admin — Sat, 10 Apr 2010 13:22:34 +0000

Ladyagin Pressure pulse jet engine , combining basis of Glukharev an Porter pressure engines.

Duration : 0:1:5

[youtube jUsuPtELxyg]

RC Twin Pulse Jet

admin — Thu, 01 Apr 2010 10:16:37 +0000

Scratch built RC Twin pulse jet powered delta.

Valved engines running on unleaded petrol. 1 liter of fuel per engine for 10 mins of flying.

230mph top speed. 10 mins duration.

Check out http://tinyurl.com/yjhg3ma for more incredible RC aircraft.

Duration : 0:2:56

[youtube 1e-Ar7gb4tQ]

Tin Can Pulse Jet

admin — Fri, 26 Mar 2010 13:09:27 +0000

Tin Can Pulse Jet.

Start with a 14.5 oz can of broth with a single 11mm hole in the top and center. Drain and rinse well. Add a tablespoon or so of Methyl Alcohol (sold under the brand HEET in a yellow container at any auto shop). Pump in a bit of fresh air to get the fuel air mixture close enough to combust.

After lighting, there is an initial pressure surge as the flame front propagates down the interior of the can. The pressure pushes the exhaust gas out of the hole and creates a vacuum inside the can. Reduced pressure causes some of the methyl alcohol to vaporize. Reignition occurs and the process repeats. Interestingly, this cycle happens well below the resonant frequency of the tin can and sounds similar to a much larger gasoline engine. All this with no moving parts!

The run time can be extended significantly by water cooling the exterior of the can. Here, a slightly larger tin can was used as a water jacket.

Duration : 0:1:8

[youtube zcCr4GsGF4A]

Pressure Jet Engine Overview and Starting

admin — Fri, 06 Nov 2009 14:19:37 +0000

This is an overview of a small pressure jet prototype, and showing the engine start and run.

It is raining while the engine is running, you can hear the engine sputter when it sucks in rain drops.

If you are the whiny impatient type that cant wait a few minutes to see the engine run, go cry somewhere else about it and dont bother commenting about how your life was inconvenienced by having to listen to the explanation about the engine.

Duration : 0:3:32

[youtube XnvbiDX_RDc]