Search found 2158 matches

by Viv
Wed Mar 30, 2011 11:58 am
Forum: Jet Vehicles, All Types
Topic: "Jet" pack
Replies: 31
Views: 15599

Re: "Jet" pack

I think they have done an impressive amount of work to produce what is arguably a very compact power source (2 stroke V4) and an airframe to take it, what leaps out at me though is all the jetpacks suffer from control instability issues and the only thing to stabilize them is the pilot (and his reac...
by Viv
Sun Mar 27, 2011 1:14 pm
Forum: Valveless pulsejet forum
Topic: Acoustic Length Starting Point on Curved Surfaces
Replies: 3
Views: 1786

Re: Acoustic Length Starting Point on Curved Surfaces

Hi That's a very creative way of solving a problem, I like the use of a liquid piston as it figures in some of the Stirling engine designs I have been interested in for years, I understand the point of a challenging problem and what happens when you solve it, but there is always another one to take ...
by Viv
Sat Mar 26, 2011 9:17 pm
Forum: Valveless pulsejet forum
Topic: Acoustic Length Starting Point on Curved Surfaces
Replies: 3
Views: 1786

Re: Acoustic Length Starting Point on Curved Surfaces

Hi HPSCL (what ever that is) You can take the mean length of the tube as intersected by the curve of the combustion chamber in your example drawing, treat this as the center frequency of the tube for its acoustic resonance, a slight spread ether side of that gives you a broader bandwidth (or wider r...
by Viv
Mon Mar 21, 2011 12:26 am
Forum: Off topic forum
Topic: Example
Replies: 0
Views: 1383

Example

Government of Quebec web portal http://www.gouv.qc.ca/portail/quebec/pg ... n/?lang=fr

Viv
by Viv
Thu Mar 17, 2011 11:17 pm
Forum: Tools and Construction
Topic: Odd Metal jars
Replies: 554
Views: 1755610

Re: Odd Metal jars

Hi Joe, personally i set up the cooling so that it would thermo siphon, so i have the cooling pipes- one at the top one at the bottom, i just think its a bit more efficient. great stuff though Matiz :D Viv will recall the tests we did with my version - I did very similar stuff with a syringe and va...
by Viv
Thu Mar 17, 2011 11:14 pm
Forum: Valved pulsejet forum
Topic: Planing for next years speed weekend, (1/2 scale Argus)
Replies: 111
Views: 53029

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

What he said ;-)

And use the spark plug that's further away from the valve grid not the nearest one, that will help to make sure you get a good amount of air/fuel mix in the engine before its ignited

Viv
by Viv
Thu Mar 17, 2011 2:11 pm
Forum: Valved pulsejet forum
Topic: Planing for next years speed weekend, (1/2 scale Argus)
Replies: 111
Views: 53029

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

Hi Linus I think John is perfectly correct and has hit the nail on the head, the air jets are on the wrong side of the valve grid and are not atomizing the fuel correctly and pushing it far enough down the combustion chamber, the fact that the nearest spark plug to the valve grid works best would te...
by Viv
Wed Mar 16, 2011 11:51 pm
Forum: Valved pulsejet forum
Topic: Planing for next years speed weekend, (1/2 scale Argus)
Replies: 111
Views: 53029

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

Hi Linus My first impression is how "soft" the first ignition pulse sounds, its a puff out of the exhaust pipe not a bang, lets see what other people think of that observation? ? what is happening at the valves when the engine fires? does any backfiring happen at the inlet at all? ? did you test the...
by Viv
Tue Mar 08, 2011 3:36 pm
Forum: Valved pulsejet forum
Topic: pulsejet combustion in microgravity
Replies: 21
Views: 6456

Re: pulsejet combustion in microgravity

I just noticed a little article on zero G combustion today so thought i would add it for your enjoyment ;-)

http://io9.com/#!5779127/how-does-fire- ... ro-gravity

Viv
by Viv
Fri Mar 04, 2011 3:04 pm
Forum: Valved pulsejet forum
Topic: Planing for next years speed weekend, (1/2 scale Argus)
Replies: 111
Views: 53029

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

Hi John

I think we should advise them to step up the ear protection to ear plugs and ear protectors as well ;-) I am not sure a cod peace would be out of the question ether!

Viv
by Viv
Thu Mar 03, 2011 5:10 pm
Forum: Valved pulsejet forum
Topic: Planing for next years speed weekend, (1/2 scale Argus)
Replies: 111
Views: 53029

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

Its definitely starting to get an awesome look about it ;-) I was just looking at it and wondering about the sound pressure and how it was going to impact the rider? the exhaust is going to be pretty close to his dangley bits ;-)

Viv
by Viv
Thu Mar 03, 2011 5:07 pm
Forum: Valveless pulsejet forum
Topic: Industrial Heater FWE Type II and Type III
Replies: 7
Views: 3197

Re: Industrial Heater FWE Type II and Type III

Hi Larry

looking good my friend, wish you the best of luck with it,

Viv
by Viv
Tue Mar 01, 2011 12:11 am
Forum: Valved pulsejet forum
Topic: Planing for next years speed weekend, (1/2 scale Argus)
Replies: 111
Views: 53029

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

Looking good guys, good luck with the first run

Viv
by Viv
Wed Feb 23, 2011 2:45 pm
Forum: Gas turbine forum
Topic: TV94 TurboFan Build
Replies: 59
Views: 76849

Re: TV94 TurboFan Build

Hi Ash

Nice to see you back and continuing your projects build, Bon chance ;-)

Viv
by Viv
Sun Jan 30, 2011 4:30 pm
Forum: Tools and Construction
Topic: Basic Gasifier Build
Replies: 91
Views: 1669964

Re: Basic Gasifier Build

Hi Joe Ok it will be fun to see if it starts chuffing like the old one again, by the way do you have any way to get an idea of what temperatures you are seeing in the gasification zone in the combustion chamber? also I was thinking off the hook a bit about if a car air mass sensor could be used in s...