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Model recommendations for use with a pulse jet?

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Model recommendations for use with a pulse jet?

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Old 05-09-2008, 11:12 AM
  #1  
trofodotiki
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Default Model recommendations for use with a pulse jet?

Hello everyone!Could you please advise me one what models (in arf or kit form) will be suitible for use with a pulse jet i have?The pulse jet i have is about 15% larger than a dynajet.
I was thinking of a Lanier Shrike, as the engine can easily be mounted on top of the 'fuselage' and go between the tail fins,anyone know of a store what still has the arf version for sale(or any of you guys have one?).Also any advice on height placement of the fuel bladder?
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Old 05-10-2008, 07:27 PM
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Crash Campbell
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Default RE: Model recommendations for use with a pulse jet?

Hi trofodotiki,

Pulse jets are seriously L O U D, please wear ear protection and make certain you fly where the noise won't anoy neighbours. I can't think of anything more certain to bring noise complaints. A pulse jet is much louder than a comparable modern turbine and at a frequency a sound pressure level that will permanently damage your hearing. That said there are some old plans for pulse jet models (control line) from the English and Australian magazines that could possible be adapted to R/C.

About forty years ago a mate built a control line model with a pulse jet, from memory the tank and engine were on the same level the flight lasted about three seconds from BLAST OFF to a crater.

Good Luck,

Colin
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Old 05-10-2008, 09:20 PM
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JohnBuckner
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Default RE: Model recommendations for use with a pulse jet?

There have been many succcesful pulse jet Rc airplanes in the past and presently although not as widely used as in the still active controlline speed jet class.

Chief dissadvantage of course is lack of throttling fairly low thrust compared to a true turbine and the almost imperitve need to use a fully exposed engine for cooling to prevent valve failure.

Operationally The aircraft must be launched in seconds agine to avoid valve failure.

Here is a pretty cool fairly recent twin:

http://www.youtube.com/watch?v=1e-Ar7gb4tQ
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Old 05-11-2008, 11:51 AM
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Ed_Moorman
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Default RE: Model recommendations for use with a pulse jet?

Bruce Tharp and his father out in Oregon have done a lot of RC pulse jets. Here is the link to his site. You'll need to contact him about the pulsers.

[link=http://www.btemodels.com/]Bruce Tharp Engineering[/link]
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Old 05-11-2008, 02:17 PM
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Default RE: Model recommendations for use with a pulse jet?

Thanks everyone for your advice so far, i have had some bench test so far(each lasting at most 10 seconds no to melt the valves) and i am trying to set up a throttleling solution with a smoke pump connected to an ESC to control its electric motors speed. Good thing i live in Greece(during the summer) where we can make as much noise as we want to! The BTE Vortex looks promising(thanks Ed_Moorman !). I am just running gasoline in it now,any better ideas for fuel?
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Old 05-11-2008, 08:06 PM
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Default RE: Model recommendations for use with a pulse jet?

white gas.
Get in touch with Bruce as mentioned above. He has tons of experience with PJs
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Old 06-10-2008, 11:14 AM
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2M86
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Default RE: Model recommendations for use with a pulse jet?

The video of my pulsejet......

http://it.youtube.com/watch?v=WymNgZXLsRs

Bye,
Massimo.
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Old 09-18-2008, 12:52 AM
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Default RE: Model recommendations for use with a pulse jet?


ORIGINAL: trofodotiki

Hello everyone!Could you please advise me one what models (in arf or kit form) will be suitible for use with a pulse jet i have?The pulse jet i have is about 15% larger than a dynajet.
I'm putting one of my 8lbs-thrust engines into one of those 40-sized Chinese ARF Long-EZs and after that I'll be sticking a 15lb-thrust pulsejet into a .40-sized BobCat.

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Old 10-31-2008, 02:26 PM
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Default RE: Model recommendations for use with a pulse jet?

Hi XJet!

Did you start modyfing the bobcat .40 for the pulso?

I have one chinnese bobcat that I bought to put a turbine, but I bought a Stingray and I flying turbines with it.

I would like to build a pulso tu put it in my bobcat!!!
I saw your Long EZ in youtube, very cool! I would like to see it flying!

Do you have plans of a pulso that can fit in my bobcat?

BTW...a long time ago I sent you an email asking for your book.... but I never received a response..

Please, sent me an email/PM if you can help...

Thanks!

M.-
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Old 11-03-2008, 02:35 AM
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Default RE: Model recommendations for use with a pulse jet?

The pulsejet-powered Long-EZ flew today for the first time.

I had an issue with the fuel filter which meant that air bubbles were getting into the fuel line and that caused the engine to stop prematurely but it seems to have plenty of power.

Video on YouTube at:

http://nz.youtube.com/watch?v=3pYD1F6t-O0

That's an 8lbs-thrust engine which I designed specifically to be easy on the valves. It's had quite a bit of static running on the current valve and it still appears to be in perfect condition no heat or wear damage apparent so it seems I succeeded in my goal.

There is a degree of throttle control but only when on the ground. You'll notice that I start the engine on low power and then open the throttle for take off.

I'm now designing a 15-lbs thrust pulsejet specifically for the Bobcat 50.
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Old 11-03-2008, 06:59 AM
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Default RE: Model recommendations for use with a pulse jet?

Here is the page to the link for the Bruce Tharpe pulse jet, http://www.btemodels.com/shockwave.html . Ed Moorman's link is to the home page and I have yet to find a link from there to this page for the pulse jet.
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