looking for 100/200 lbs PJ plans

Moderator: Mike Everman

Post Reply
gettylee
Posts: 102
Joined: Thu Feb 14, 2013 5:21 pm
Antipspambot question: 125

looking for 100/200 lbs PJ plans

Post by gettylee » Tue Mar 26, 2013 6:20 pm

Hi,just curious if there is any proven & relatively simple plans for a 100 to200 pound thrust PJ engine,ide like to build a pulse jet sled, fire&ice! Great promo for my heating&cooling co. :) any suggestions will be much appreciated! Thx much, Brian :D

gettylee
Posts: 102
Joined: Thu Feb 14, 2013 5:21 pm
Antipspambot question: 125

Re: looking for 100/200 lbs PJ plans

Post by gettylee » Thu Mar 28, 2013 1:39 pm

gettylee wrote:Hi,just curious if there is any proven & relatively simple plans for a 100 to200 pound thrust PJ engine,ide like to build a pulse jet sled, fire&ice! Great promo for my heating&cooling co. :) any suggestions will be much appreciated! Thx much, Brian :D
Also/ either, multiple engines with easy starting would be great! Dose thermo jet start instantly?

metiz
Posts: 1517
Joined: Fri Apr 21, 2006 6:34 pm
Antipspambot question: 125
Location: Netherlands

Re: looking for 100/200 lbs PJ plans

Post by metiz » Thu Mar 28, 2013 8:07 pm

With the right kind of injector, yes. try this, build one with an expanded tail viewtopic.php?f=3&t=5914 and use the smallest allowable intake size by the caliber method. One intake is starts easier, has more power but consumes more fuel, multiple intakes have slightly less thrust but lower fuel consumption
Quantify the world.

gettylee
Posts: 102
Joined: Thu Feb 14, 2013 5:21 pm
Antipspambot question: 125

Re: looking for 100/200 lbs PJ plans

Post by gettylee » Mon Apr 01, 2013 10:17 pm

Hello,I was wondering if the pressure jet,is a good engine&or will it produce the 130lbs ? &is it a feasible engine to build? If so?is there a good plan for one? Thx much Brian

metiz
Posts: 1517
Joined: Fri Apr 21, 2006 6:34 pm
Antipspambot question: 125
Location: Netherlands

Re: looking for 100/200 lbs PJ plans

Post by metiz » Mon Apr 01, 2013 10:29 pm

There aren't a lot of pressurejet plans available, most have only a fraction of the thrust you want. If you can design an engine big enough it will start on its own
Quantify the world.

gettylee
Posts: 102
Joined: Thu Feb 14, 2013 5:21 pm
Antipspambot question: 125

Re: looking for 100/200 lbs PJ plans

Post by gettylee » Mon Apr 01, 2013 11:04 pm

metiz wrote:There aren't a lot of pressurejet plans available, most have only a fraction of the thrust you want. If you can design an engine big enough it will start on its own

Hello&thx,is there a good choice for easy starting & 100+ thrust,other than a Lockwood?I did top out on pedal valves with my 20lb 100mm pj
Attachments
IMG_20130331_182912_211.jpg

gettylee
Posts: 102
Joined: Thu Feb 14, 2013 5:21 pm
Antipspambot question: 125

Re: looking for 100/200 lbs PJ plans

Post by gettylee » Tue Apr 02, 2013 12:19 am

gettylee wrote:
metiz wrote:There aren't a lot of pressurejet plans available, most have only a fraction of the thrust you want. If you can design an engine big enough it will start on its own

Hello&thx,is there a good choice for easy starting & 100+ thrust,other than a Lockwood?I did top out on pedal valves with my 20lb 100mm pj
Hello,I sure do appreciate every bodys suggestions! This has been a dream come true! For me, thx everyone!!!! :) OK,so how about a good valve grid,one that can be made fairly easy, Im aware nothing is easy! Lol but a Argus scaled down sure would work for my jet sled project. Thx again!!!

metiz
Posts: 1517
Joined: Fri Apr 21, 2006 6:34 pm
Antipspambot question: 125
Location: Netherlands

Re: looking for 100/200 lbs PJ plans

Post by metiz » Tue Apr 02, 2013 10:58 am

As far as I know, only lockwood or similar thrust (55pounds) are readily available. You should be able to whip up your own design without much trouble by using Pyrojoe's recipe
Quantify the world.

gettylee
Posts: 102
Joined: Thu Feb 14, 2013 5:21 pm
Antipspambot question: 125

Re: looking for 100/200 lbs PJ plans

Post by gettylee » Wed Apr 03, 2013 2:21 am

Hello,ironically I use pyrojoes recipe for my 117mm valved,just shortened the tail flare,I started gathering valve cage parts,the external valve grid,got me all excited! I'm thinking around 1/3 scale Argus,10"dia. & two rows of reed valves,&I'm thinking of powering a furnace oil pump,with a chainsaw,also get my spark,&throttle the pump with chainsaw rpms,& using standard furnace nozzle@150psi with diesel/ kero mix, just a idea, :) & to think this all started with my little wonderful! Fwe, & what a journey!!! :)

gettylee
Posts: 102
Joined: Thu Feb 14, 2013 5:21 pm
Antipspambot question: 125

Re: looking for 100/200 lbs PJ plans

Post by gettylee » Thu Apr 18, 2013 8:19 am

Hello,dose anyone know if there is a 60lb valved engine plan,anywhere, free or buy? I'd like two build a ice/snow sled,with two 60 or 75 lb thrust valved engines on it.thx much!!!! :)

gettylee
Posts: 102
Joined: Thu Feb 14, 2013 5:21 pm
Antipspambot question: 125

Re: looking for 100/200 lbs PJ plans

Post by gettylee » Fri Jun 07, 2013 8:34 pm

I found very nice100lb , 20lb , & 7lb valved pulse jet plans,on eBay,there from scientific supply,I bought them & I'd recommend them,they are very innovated!!! I'm very pleased with them&the price" :)

dynajetjerry
Posts: 465
Joined: Thu Jan 27, 2005 4:57 pm
Antipspambot question: 0
Location: Ohio, USA

Re: looking for 100/200 lbs PJ plans

Post by dynajetjerry » Tue Jun 25, 2013 6:20 pm

Gettylee,
A valveless pj is much simpler, longer lasting, and more reliable than any valved design but all of them burn twice or more fuel than valved, for similar thrust. They are also slightly less noisey and easier to start.
I have a Thermo-Jet J3-200 of about 3 lbs. thrust and it burns twice as much liquid propane (in a pressurized tank,) as my 4.5 lb. Dyna-Jet's consumption of gasoline (unpresurized.) Keep that in mind when working with any valveless pj.
Jerry Wiles
Louder is always better.

gettylee
Posts: 102
Joined: Thu Feb 14, 2013 5:21 pm
Antipspambot question: 125

Re: looking for 100/200 lbs PJ plans

Post by gettylee » Mon Jul 08, 2013 10:03 am

I found all the plans I needed ,from scientific supply,I am building a 100+lb. thrust Argus style engine now :)
Attachments
IMG_20130706_173553_332.jpg
Last edited by gettylee on Mon Jul 08, 2013 4:22 pm, edited 1 time in total.

dynajetjerry
Posts: 465
Joined: Thu Jan 27, 2005 4:57 pm
Antipspambot question: 0
Location: Ohio, USA

Re: looking for 100/200 lbs PJ plans

Post by dynajetjerry » Mon Jul 08, 2013 1:34 pm

Gettylee,
Based on your pictured pj, I'm guessing that its exhaust flare is much larger than necessary for your application. In fact, it is possible your static thrust could be 25%-50% greater than as shown, if the flare were reduced to about 1-2 in. larger than the tailpipe. I say this because of tests Aeromarine Co. conducted on their 8 in., 210 lb. thrust pj and a Dyna-Jet with a flare that was 2.5 in. It was run with the flare incrementally reduced to zero. At 2.5 in., thrust was about 3 lb., at zero it was about the same, and at 1.25, it was about 4.5. Keep in mind the reeds burn out very quickly if there are no provisions for cooling them. Aeromarine accomplished this on their 8 in. design by injecting 1/2 the fuel into the inlet venturi (D-J style,)and the rest into the comb. chamber (Argus style). All this is in my D-J book.Good luck.
Jerry
Louder is always better.

gettylee
Posts: 102
Joined: Thu Feb 14, 2013 5:21 pm
Antipspambot question: 125

Re: looking for 100/200 lbs PJ plans

Post by gettylee » Mon Jul 08, 2013 3:40 pm

Awsom,thx for the info, because my flair is a prototype experiment, now is a good time for suggestions,I plan on making a ice sled with this PJ, & push me, so the flair is a must& she's@11to1 tailpipe, so it should be OK to shorten my flair, I suppose I can fire it up and look for the heat line on the flare,that may determine where I may want to cut it off. Thx for the info! :)

Post Reply