Search found 503 matches

by racketmotorman
Fri Nov 11, 2011 2:37 am
Forum: Gas turbine forum
Topic: Turbo jet plans
Replies: 17
Views: 12338

Re: Turbo jet plans

Hi If you want to finish it, go ahead, but you're wasting your time and energy doing it , ...............an axial compressor is a very complex piece of equipment , making one is beyond the most experienced home turbine builder , just looking at the pic of your blading , there doesn't appear to be an...
by racketmotorman
Tue Nov 08, 2011 8:46 pm
Forum: Gas turbine forum
Topic: Turbo jet plans
Replies: 17
Views: 12338

Re: Turbo jet plans

Hi A 6 inch diameter axial turbine engine would normally run up to an rpm of ~ 60,000 , with idling rpm of ~30,000 rpm ( 50% N1) . A single stage axial compressor will produce a pressure ratio ( PR) of maybe ~1.6 :1 from a transonic wheel , whereas a "normal" axial stage will produce a PR of ~1.2 :1...
by racketmotorman
Tue Nov 08, 2011 12:30 am
Forum: Gas turbine forum
Topic: Turbo jet plans
Replies: 17
Views: 12338

Re: Turbo jet plans

Hi Please STOP construction and start reading , this engine WILL fail in its current configuration !! ..................it is no where strong enough to cope with the massive forces involved . How big will the turbine wheel be ?? What rpm do you plan on using?? Do you know what idle speed ?? Cheers J...
by racketmotorman
Mon Nov 07, 2011 8:21 am
Forum: Gas turbine forum
Topic: Turbo jet plans
Replies: 17
Views: 12338

Re: Turbo jet plans

Hi Enders I'd suggest you do a lot more research before going any further , the current design has virtually no chance of working , even if you get it to spin around the design is so fragile that wheels will explode. There is a good book by Thomas Kamps ,Model Jet Engines , Traplet Publications , tr...
by racketmotorman
Sat Apr 23, 2011 3:56 am
Forum: Valved pulsejet forum
Topic: Planing for next years speed weekend, (1/2 scale Argus)
Replies: 111
Views: 49514

Re: Planing for next years speed weekend, (1/2 scale Argus)

Hi One of the things I suggest earlier to Linus was to install the start air "inside" the engine as the Argus had , rather than using the current external setup , the internal airjets would have helped with vapourisation of the fuel spray as well as sending it further into the combustion chamber for...
by racketmotorman
Fri Apr 22, 2011 10:38 pm
Forum: Valved pulsejet forum
Topic: Planing for next years speed weekend, (1/2 scale Argus)
Replies: 111
Views: 49514

Re: Planing for next years speed weekend, (1/2 scale Argus)

Hi Guys My 2 cents worth I'll agree with Pyro on this one , gotta get that first big bang to get the system working , the original Argus used acetylene in cold weather , these guys are starting this engine in Arctic conditions , they need a "big bang" to get those valves opening , and to achieve tha...
by racketmotorman
Wed Apr 06, 2011 9:59 pm
Forum: Jet Vehicles, All Types
Topic: Hello
Replies: 2
Views: 2026

Re: Hello

Hi BJ

Welcome , hope you get inspired :-))

Cheers
John
by racketmotorman
Tue Mar 29, 2011 12:42 am
Forum: Gas turbine forum
Topic: Unique 160 lb thrust micro jet turbine for sale- turnkey
Replies: 3
Views: 7280

Re: Unique 160 lb thrust micro jet turbine for sale- turnkey

Hi

Excellent "numbers" , thanks for that , shall sit down and digest slowly :-))

Cheers
John
by racketmotorman
Fri Mar 25, 2011 5:04 am
Forum: Jet Vehicles, All Types
Topic: Jet Powered Mini Monster Truck project
Replies: 1
Views: 1922

Re: Jet Powered Mini Monster Truck project

Hi
Neat looking unit :-)

Good to see some more turbine vehicles here on the PJ Site .

Checkout ................ http://jetandturbineowners.proboards.com/ and http://tech.groups.yahoo.com/group/DIYGasTurbines/ for more turbine vehicle Forums .

Cheers
John
by racketmotorman
Thu Mar 24, 2011 9:45 pm
Forum: Gas turbine forum
Topic: Unique 160 lb thrust micro jet turbine for sale- turnkey
Replies: 3
Views: 7280

Re: Unique 160 lb thrust micro jet turbine for sale- turnkey

Hi

Could you provide some engine specs , mass flow , pressure ratio , rpm , fuel burn rates dry/wet , physical engine size , diameter/length/weight .

Cheers
John
by racketmotorman
Thu Mar 17, 2011 9:46 pm
Forum: Valved pulsejet forum
Topic: Planing for next years speed weekend, (1/2 scale Argus)
Replies: 111
Views: 49514

Re: Planing for next years speed weekend, (1/2 scale Argus)

Hi Linus So the engine is half scale with regards thrust level , not physical dimensions. 12 x 22 gph ( I assume thats US GPH nozzle rating) = 264 gph = 4.4 gpm, = 16.6 lpm .....mmmm, a lotta fuel :shock: Nozzles rated at 100psi , so at 30psi they'll be flowing ~55% of rated flow , so ~9 lpm , still...
by racketmotorman
Thu Mar 17, 2011 8:23 pm
Forum: Valved pulsejet forum
Topic: Planing for next years speed weekend, (1/2 scale Argus)
Replies: 111
Views: 49514

Re: Planing for next years speed weekend, (1/2 scale Argus)

Hi Linus I'm curious as to your fuel injection system , I had a lot of troubles with my turboprop PJ when I started using petrol instead of LPG/propane , ended up having to use a 18GPH 80 degree semi solid pattern spray nozzle at ~110psi ( EFI fuel pump ) supplying ~1.1 litre/min , as well as propan...
by racketmotorman
Thu Mar 17, 2011 8:45 am
Forum: Valved pulsejet forum
Topic: Planing for next years speed weekend, (1/2 scale Argus)
Replies: 111
Views: 49514

Re: Planing for next years speed weekend, (1/2 scale Argus)

Hi Linus As you know , I'm more of a turbine builder than a PJ builder , but it won't hurt to have some different views of the subject :-) The drawings I have of the original Argus show the 3 starting air jets were positioned just "above" the top 3 fuel injector , this positioning of the start air j...
by racketmotorman
Thu Mar 17, 2011 12:25 am
Forum: Valved pulsejet forum
Topic: Planing for next years speed weekend, (1/2 scale Argus)
Replies: 111
Views: 49514

Re: Planing for next years speed weekend, (1/2 scale Argus)

Hi Linus

Did you try it without the inlet diffuser ??

What was your fuel injection rate and pressure ??

Where is your starting air plumbed to ??

Cheers
John
by racketmotorman
Thu Mar 03, 2011 8:50 pm
Forum: Valved pulsejet forum
Topic: Planing for next years speed weekend, (1/2 scale Argus)
Replies: 111
Views: 49514

Re: Planing for next years speed weekend, (1/2 scale Argus)

Hi Viv LOL, I think his "dangly bits" will end up being "mushed" by the shock waves , sorta like how they destroy gall stones in hospital , its the "computer" sitting on his shoulders that I'm worried about , it'll be bouncing from one side to the other trying to break its way thru the skull bone .....