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Old 03-28-2018, 01:21 AM
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blackshire blackshire is offline
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Default Pulse jet boosters (links)

Hello All,

I came across several videos of modern tests of V-1 Argus pulse jet engines (and a JB-2 Loon pulse jet engine; the Loon was a U.S. copy of the V-1 “doodle-bug” or “buzz-bomb”)—the noise and fire are incredible! I also found videos of pulse jet-powered RC and Control Line model airplanes; links to videos of these models (and of the current-day V-1 and Loon pulse jet tests, plus historic flight footage) are included below. (The He 162 “Volksjäger” [“People’s Fighter”] is a common pulse jet-powered scale model subject.) Also:

Watching the pulse jet model videos (they typically use elastic or bungee catapults and inclined launch rails in order to shorten the takeoff distance, rather like the actual V-1 “buzz-bombs”), it occurred to me that model rocket motors—in parachute- or streamer-equipped booster body tubes, if desired--could be used to get the models airborne in even shorter distances, even “zero-length.” The model pulse jet engines’ higher-frequency buzzing, surprisingly, sounds like aircraft *piston* engines. In addition:

Such model rocket motor-powered boosters could also be made--to scale--to boost ducted fan- (or turbojet-, or even pulse jet-powered) RC (or even Free Flight, if timer-equipped electric ducted fans were used) scale models of early cruise missiles, such as the MGM-1 Matador ( http://en.wikipedia.org/wiki/MGM-1_Matador ), MGM-13 Mace ( http://en.wikipedia.org/wiki/MGM-13_Mace ), SM-62 Snark ( http://en.wikipedia.org/wiki/SM-62_Snark ), SSM-N-8 Regulus I ( http://en.wikipedia.org/wiki/SSM-N-8_Regulus ), and SSM-N-9 Regulus II ( http://en.wikipedia.org/wiki/SSM-N-9_Regulus_II ), as well as models of current jet drones, including the BQM-34 Firebee ( http://en.wikipedia.org/wiki/Ryan_Firebee ), the MQM-107 Streaker ( http://en.wikipedia.org/wiki/Beechc...QM-107_Streaker ), and the BQM-167 Skeeter ( http://www.designation-systems.net/dusrm/m-167.html ), among other jet drones of this type. (Videos of these full-scale cruise missiles and jet target drones--and others, of course--are also on YouTube www.youtube.com.) Here are the video links:

Modern V-1 Argus pulse jet engine static test—incredible noise and vibration! www.youtube.com/watch?v=Rdwbp6R2qM8

Outdoor Argus pulse jet static firing at a museum. www.youtube.com/watch?v=Hh3PexhT4Ss

JB-2 Loon (U.S. V-1 copy) pulse jet engine static firing test at a museum www.youtube.com/watch?v=WCsKs2NhdWg

Nearly 1:1 scale V-1 flying replica. www.youtube.com/watch?v=95yaa98NO9k

Nearly full-scale RC V-1 flying model (with onboard camera view, too). www.youtube.com/watch?v=zy03UVxfxqg

Vintage (World War II) V-1 films. http://www.youtube.com/results?sear...buzz+bomb+sound

Weston RC pulse jet demonstration last year. www.youtube.com/watch?v=zwXLDjYqVgc

RC model pulse jet airplane. www.youtube.com/watch?v=uwlqH6ugGMM

Model pulsejet planes at Weston Park. www.youtube.com/watch?v=r50DRou0LsM

Several He 162 pulse jet-powered (and some ducted fan- and turbojet-powered He 162) videos, portraying multiple scale models of this type. http://www.youtube.com/results?sear...e+162+pulse+jet

Pulse jet powered He 162 scale model. www.youtube.com/watch?v=-7dH2B0cyuE

Dutch pulse jet model (with onboard camera views, too). www.youtube.com/watch?v=_h6D47Lkfcw

Control line pulse jet model plane (with slow-motion sequence). www.youtube.com/watch?v=_TlCtzjx28w

Here (see: www.youtube.com/watch?v=zwXLDjYqVgc ) is another—from just last year, and with still shots, too—video of one of the delta-winged pulsejet RC models, and:

Here (see: www.youtube.com/watch?v=y298zg9JgRM ) is a double-delta, tailless pulse jet RC model, and *here* ( www.youtube.com/watch?v=PXI2AEzlqyI , www.youtube.com/watch?v=f4RwhJpqHCU , www.youtube.com/watch?v=t93KmnNtWv8 , www.youtube.com/watch?v=WrOsLhUA6-I , www.youtube.com/watch?v=nY7P48BKfAs , www.youtube.com/watch?v=bXmph7rLER0 , www.youtube.com/watch?v=CxYuffN0qCY , and www.youtube.com/watch?v=al0WeND149Y ) are videos of various tailless pulse jet RC models.

I hope these videos will be interesting.
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Old 03-28-2018, 03:52 AM
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mycrofte mycrofte is offline
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Those have been around for a long time. I remember them in R/C magazines in the 70's and 80's.
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Old 03-28-2018, 04:55 AM
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blackshire blackshire is offline
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Quote:
Originally Posted by mycrofte
Those have been around for a long time. I remember them in R/C magazines in the 70's and 80's.
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Indeed--I remember the Dyna-Jet pulse jet engines (Hobby King is making them again, see: http://www.google.com/search?source...1.0.nB6q4pP1L9I ). Such engines were also made in smaller and larger sizes (there were Japanese makers of these engines, too, in the 1950s and 1960s, and some European RC flyers use larger pulse jets today), and:

At Orange Blossom Hobbies in Miami (now long gone), I recall once seeing, on display there many years ago (it wasn’t for sale, but was part of a collection of historic old model airplane engines), a model airplane pulse jet engine that was only about half the size of Hobby King’s Redhead/Dyna-Jet pulse jet (the tiny pulse jet was on display next to a “standard size” Redhead pulse jet engine [Curtis Dyna-Products, which made the Dyna-Jet pulse jet, is still in business, now called Curtis Dyna-Fog: http://www.dynafog.com/about-us-2/ ). Also:

If a pulse jet engine was mounted inside a properly-contoured bypass duct (like the simple “bypass turbojet,” which is also mounted inside such a duct [it's not to be confused with a low-bypass turbofan, which is sometimes also called a bypass turbojet, especially if the bypass ratio is very low]), it would produce greater static thrust, and it should also be quieter (since the larger-volume mixed bypass air/pulse jet exhaust flow would exit the bypass duct's nozzle more slowly, as in a turbofan engine as compared with a turbojet). It would also tend to muffle the rapid "boom-boom-boom" combustion pulses.
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Black Shire--Draft horse in human form, model rocketeer, occasional mystic, and writer, see:
http://www.lulu.com/content/paperba...an-form/8075185
http://www.lulu.com/product/cd/what...of-2%29/6122050
http://www.lulu.com/product/cd/what...of-2%29/6126511
All of my book proceeds go to the Northcote Heavy Horse Centre www.northcotehorses.com.
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