After crazy talk at last meet...

[Vipers]

i'm well interested in attempting to make a subsonic ram/pulse jet.

would it be more efficeint to have 2 small ones 1 each side of the car feeded by vents

or 1 in middle at the back feeded by two vents

also a concern is, if this is done, it wud be dangerously close to the fuel tank. as in on top of it almost. any suggestions of mounting or something??

for fuel was thinkinbg of kerosene and ignitors nick those form a old gas hob with the clicky thingy.

actually thinking about it now. nick that entire gas hob assembly cuz that has the fuel injectors as well as the ignitors. just need the case type thing designed really. but defo don't want that little cone thing at the front to add to compression as this makes it into a (super?)sonic ram jet.

thoughts?

[Nathan_200sx]

Originally posted by Vipers
thoughts?

Yes MAD MAN but I like it ;):D:D

[Will Taylor]

Originally posted by Vipers
thoughts?

Firstly - you mad ****er! :D

Secondly - ramjets won't work at low speeds :(

[Vipers]

from what i can see a 15" diameter ramjet can create 300 lbf thrust.

im gueesing that sounds good.

because it wud mean faster acceleration i suppose i could have a leccy fan after the inlet to accelerate the air to the fuel injectors and then onto the ignitors then the 0-60 wud be improved i guess cuz other wise its not going to be an efficient ramjet untill it has sufficient airflow speeds to get enough thrust. so u'd only start to benefit form it @ 100mph + but you want it from the off as it were so flick on the ignitors then flick on the leccys fan then flick on the fuel injectors an thar we go

[Vipers]

Originally posted by Will Taylor
Firstly - you mad ****er! :D

Secondly - ramjets won't work at low speeds :(

thats what i thought ( the low speed thing) hence the leccy fan.

prolly wudn't attempt on my car but on a car to play with.

also down force will be desparately required, is there a fornt splitter for the 2***** that genrates down force?

not sure what the mad ****er is but i wud prolly agree.

it wud be a bit of fun really sitting ina car thats standard 0-60 is 6.5 with some other bits and bobs done to it get it down to 5.5 secs and also shove a ramjet on it then sit next to a mclaren f1 if you can find one!! if the leccy fan trick works i'd hope that it wud make an impact on 0-60 hopefully get it down to 4 secs if not less and with that the ram jet will be getting more feed so it will"spool??" up quiker and so possiblky top end of 300mph+?? wud be funny need crahs helmet tho :D :p

i think that wud be more worrying for the person ur racing. sitting at the ights he starts revving it , u put on a crahs helmet!!!:cool: then he gets off the mark a bit quiker but when mr ramjet comesin to play >>>>>>>>>>>>>>>>>>>>>>>>>>>> bye

[AndyT]

May I point this (http://www.darwinawards.com/darwin/darwin1995-04.html) out. :rolleyes:

Obviously though you wouldn't run that much power ;) :)

[Vipers]

maybe not VTOL untils or things alike. what i'm thinking of would be

at the widest point the diameter of the "unit" would be 7".

not sure what sioze i will make the inlet and outlets. but the ignitors and fuel injection will just be the ring from a gas hob i recon for the experimental unit. the fuel will be a bottle of kerosene. and a leccy fan will prolly be required to acclerate the air. so i need to find the most effiectent fan/propelor to displce the most air the quikest.

what u recon. i'll try and find the websites that i have been looking at that tells you how to make them.

also on my browsing i found a car that was actually powered by a ram jet. they reconed it done 400+mph on a 1/4 mile run

but i'm not planning on a unit that powerfuljust something to get me to over 200mph i think.

[Vez]

Errr, waddya mean, flick a switch and get 0-60 in 4 seconds.....

The only way your gonna get any form of jet to help you do this is to have it on max thrust/tourque (which is engine at full speed whilst stationary) there fore the ram jet needing much air - from speed (if not mistaken from your above comments) would not be much cop.

Just get a gas turbine from a russian helicopter and the tourque converter and send the power through the wheels!

[Vipers]

http://www.aardvark.co.nz/pjet/ramjets.htm
http://blastwavejet.com/pulsejet.htm

the bottom link that describes how a pulse jet works. m not quite sure if i understand it yet.

i've had to rule out the ram jet because it's operational range was minimum of 400mph to max of .9 mach

with the leccyfan or turbine it wud have to be, is starting to turn it into a jet-turbine engine which wud be silly.

so i think im going to have to investigate the pulse jet systems more.

basically do you like what Marine Turbines done witha motor bike, gas turbine / helicopter engine on a motor bike. does 0-200mph in 15 secs!! and aparently will do 250+mph

[Will Taylor]

You'd be better off using conventional jets as opposed to ramjets - the whole point of ramjets is that you use existing airflow to run them. If you mount electric fans to artificially provide that airflow, you are producing a drain on the cars power. It would be kinda like trying to levitate by pullilng hard on your shoelaces...

Of course for the money all this is going to cost, you could alternatively put an s13 together that would blow Richies ND one away ;)

[gaz.thomas]

One of my old school friends is an engineer for Rolls Royce in Derby. He and a couple of workmates put together a gas turbine powered remote control plane last year. That was fun.

Gaz
-x-

[Vipers]

just been looking at pulse jet powered delta wing RC airplanes. one of them does 380 mph i suppose if you scale it right for a car then you could get benefit from it.

but you don't want it so big that someone can obviously see it.
but they are sure as hell gunna hear it!!

only thing is if i have a pulse jet developing 150 lbs of thrust (not sure if thats lots yet or not) im not certain about how it will react to me trying to steer??

[Will Taylor]

Vipers: I'd like to turn left please

200sx: Fcuk off, I want to see whats over the horizon!

Vipers: Bollooooooooooooooooockss


Does that answer your question about handling under jet thrust ;)

[AndyT]

Some of these links might help:

Firestorm Jet Funny Car (http://www.firestorm-jfc.pwp.blueyonder.co.uk/index.html)

Andrew Urwin Site (http://www.andrewurwin.co.uk/)

There are also other links on the sites.

Bizzarely enought there are RAC Operational Jet Vehicle standards :eek:

[Vipers]

ok i've found how to make pulse jets
http://home3.inet.tele.dk/kennethm/
some of them are in danish?? i think??

i've also found a guy who has made a little go kart ype thing with many different types of engine plonked on to his go kart.
his pulse jet providing around 100lbps of thrust i'd guess weighs around 20 kg's the kart wud weigh around 20 kgs and he wud weigh around 60kg to keep numbers simple.so 100lps of thrust can push 100kgs @ 40mph+ these are very rough figures

so im guessing for a significant impact on a 200 sx ur gunna need around 1000lbs+ of thrust any one got any better figures or ideas?

also basic guidlines on size to power is for 500lbs of thrust it will be around 10 ft long!:eek: so wud need to of them and have to find a way to make mroe efficient/powerful.

n e 1 with some ideaS?