Search found 63 matches

by serverlan
Tue Dec 20, 2005 4:18 am
Forum: Gas turbine forum
Topic: Tandem Turbines?
Replies: 1
Views: 2763

Tandem Turbines?

Hi all,

I was just wondering if an of you have built a turbocharger-turbine using two turbocharges in series (tandem) to get higher pressures, etc.

Like a multi-stage commercial yet.

Don
by serverlan
Mon Nov 28, 2005 3:56 am
Forum: Valveless pulsejet forum
Topic: Forum Chinese Contest
Replies: 103
Views: 51163

re: Forum Chinese Contest

Rules, rules


Its thrust for fuel thats important, not thrust for size.
just go for max specific thrust,
provided you can carry the engine to the comp. meet location ;-)
And remove the chinese limit. Any new valveless (i.e. not lockwood etc)
Then we'll just be back to the old "forum" rules.
by serverlan
Tue Nov 15, 2005 12:18 pm
Forum: Gas turbine forum
Topic: Johanssons Jet-Cart
Replies: 149
Views: 104479

re: Johanssons Jet-Cart

Oh John, you make me feel so normal! (and jealous) That bike is amazing. how long did it take to build? Re the pulsejet, I get the feeling they are more to do with poressure impulses than large amounts of gas flow, so may not be suitable. I'd guess you would need some form of chamber to spread the p...
by serverlan
Tue Nov 15, 2005 12:01 pm
Forum: Valveless pulsejet forum
Topic: A New Friend and a New Lady
Replies: 39
Views: 32460

re: A New Friend and a New Lady

Mike, you are a God!

Now for the really hard bit.

Can you put a T or Y junction, so that one pipe can feed into two? or more?

Don
by serverlan
Tue Nov 15, 2005 11:58 am
Forum: Valveless pulsejet forum
Topic: A New Friend and a New Lady
Replies: 39
Views: 32460

re: A New Friend and a New Lady

Hi Ed, I can offer just one piece of info. The colour of the flame indicates its temperature. I can't remember the exact figure now, but lets say its about 2100K If the intake temperature is 300K, then the combustion raises the temperature by a factore of 7:1. If it burns fast enough to achieve this...
by serverlan
Mon Nov 14, 2005 7:09 am
Forum: Gas turbine forum
Topic: Johanssons Jet-Cart
Replies: 149
Views: 104479

re: Johanssons Jet-Cart

Hey John, If I made something similar and used a freepower turbine to drive a propellor, I could presumably replace my 50 HP rotax on the gyro. Or I could make several and push them through the one freepower. Two of the issues with multiple engines for light aircraft ( a gyrocopter) is that more par...
by serverlan
Thu Nov 10, 2005 10:29 am
Forum: Valveless pulsejet forum
Topic: not-Eric and the half-a-Bcvp
Replies: 5
Views: 2809

re: not-Eric and the half-a-Bcvp

Hi Eric, I see your point about the "shaped-charge" effect. could be very interesting. I'll need to let it sink in for a while. (Maybe you could offset them a little and get a swirl effect to improve mixing, or somesuch.) Thats definitely a large combuster and a small tube. On the plus side it shoul...
by serverlan
Thu Nov 10, 2005 5:00 am
Forum: Off topic forum
Topic: highest power to fuel, jet
Replies: 2
Views: 1265

re: highest power to fuel, jet

turbines, turbines, and turbines.
Pity about the cost, and the maintenance, and the frailty etc.
All those moving parts. The lack of design elegance, and build simplicity.
Far too practical.
by serverlan
Thu Nov 10, 2005 4:04 am
Forum: Valveless pulsejet forum
Topic: UFLOW trainer VPJ
Replies: 11
Views: 4584

re: UFLOW trainer VPJ

Actually, I think the simulation is better if you reduce the length of segment 2 to 0.01 m. This puts the combustion very near the intake, which corressponds to where fuel/air mix is sucked in, and would combust, and so would be more consistent with the next cycle. Its a bit harder to understand tho...
by serverlan
Thu Nov 10, 2005 3:44 am
Forum: Valveless pulsejet forum
Topic: UFLOW trainer VPJ
Replies: 11
Views: 4584

re: UFLOW trainer VPJ

Its the file thformat that UFLOW1D reads/writes. If you can get it downloaded as Best[1].IMM Then start up Uflow1d.exe Use file - Open to open Best[1].IMM. Then, click on the Contour tab to see the minimalist engine design. (Combustion is designed to occur about 1/5 the way along, in section 3) Use ...
by serverlan
Thu Nov 10, 2005 3:27 am
Forum: Valveless pulsejet forum
Topic: UFLOW trainer VPJ
Replies: 11
Views: 4584

re: UFLOW trainer VPJ

err. sorry.

If you are using Microsoft Internet Explorer,
Right clik on the link, and do a Save As...

In the dialog, set the file type to "all files"
and remove the .txt extension.

don
by serverlan
Thu Nov 10, 2005 2:27 am
Forum: Valveless pulsejet forum
Topic: UFLOW trainer VPJ
Replies: 11
Views: 4584

re: UFLOW trainer VPJ

Larry,

I think this may be relevant to what you are noticing in UFLOW

Don
by serverlan
Thu Nov 10, 2005 2:25 am
Forum: Valveless pulsejet forum
Topic: UFlow progress
Replies: 28
Views: 11249

re: UFlow progress

Excellent stuff Larry, I think I'll be looking for a copy RSN. I think you have confirmed my view of an old argument, several years back. People used to talk a log about hot slugs of gas moving throught the engine, and I would argue that it is really a pressure wave moving through the gas. The press...
by serverlan
Thu Nov 10, 2005 2:09 am
Forum: Valveless pulsejet forum
Topic: not-Eric and the half-a-Bcvp
Replies: 5
Views: 2809

re: not-Eric and the half-a-Bcvp

Hi Eric, I guess a 5/8 hole would be just about perfect, seeing as you have one already, and I have no other guidance. What diameter is the chamber that the hole goes into? The ratio of areas is probably the important thing. Responding to you comments and diagram about two intakes , or a resonance t...
by serverlan
Thu Nov 10, 2005 1:53 am
Forum: Valveless pulsejet forum
Topic: Claiming the BCVP Title Back
Replies: 27
Views: 12807

re: Claiming the BCVP Title Back

Eric,

good one.
I'll reply in the non-Eric the half a BCVP thread

(It does mean non-you. Just a reference to a
Monty Python joke about Eric the half-a-Bee)

Don