Search found 2158 matches

by Viv
Mon Jun 13, 2011 2:20 pm
Forum: Pulse detonation engine forum
Topic: PREDATOR - valveless PDE build blog
Replies: 35
Views: 16549

Re: PREDATOR - valveless PDE build blog

Hi Zono. Ok That's all good, for the Mosfets you can try a standard opto-isolator, that will keep your logic devices safe on one side and you can simply power the other side with what ever gate voltage you want. Pendulum thrust stands are a good choice but watch how you read it and calculate your re...
by Viv
Mon Jun 13, 2011 1:53 pm
Forum: Pulse detonation engine forum
Topic: PREDATOR - valveless PDE build blog
Replies: 35
Views: 16549

Re: PREDATOR - valveless PDE build blog

Very impressive work, well done

Viv
by Viv
Tue May 31, 2011 5:19 pm
Forum: Valved pulsejet forum
Topic: Technical help required
Replies: 13
Views: 3443

Re: Technical help required

Hi Farhad Just a thought but if you have any pictures of your engine you could upload to the site that would help people greatly in diagnosing your problems, a drawing too of your dimensions would be nice as well. While your doing that a quick question, Are you sure there are no air leaks in your we...
by Viv
Tue May 17, 2011 10:23 pm
Forum: Off topic forum
Topic: 10 unusual burglar alarms
Replies: 3
Views: 2176

Re: 10 unusual burglar alarms

Hi Mike

They are both spam linkers Katherine and whitney

Viv
by Viv
Sun May 08, 2011 8:39 pm
Forum: Off topic forum
Topic: 10 unusual burglar alarms
Replies: 3
Views: 2176

Re: 10 unusual burglar alarms

Danny420Dale wrote:Good job on the spamtrap, viv. :D
Hey its a pleasure ;-) ( I did drop Mike a note but i guess he is still busy;-)

In the mean time it can carry on active as a honey pot for the spammers, its a technique I have used in the past with success ;-)

Viv
by Viv
Mon Apr 18, 2011 6:52 pm
Forum: Off topic forum
Topic: Magnet World
Replies: 71
Views: 27036

Re: Magnet World

Mark wrote:'We've all been taught that this doesn't happen'
http://michigantoday.umich.edu/2011/04/ ... id=8154157
Hi Mark

I have been following this with interest in the other R&D news, probably one of the most exciting discovery's in sold state physics for years in my view

Viv
by Viv
Sun Apr 10, 2011 12:57 am
Forum: Valveless pulsejet forum
Topic: homemade jet bathtub that was powered by a BBQ propane tank
Replies: 42
Views: 13427

Re: homemade jet bathtub that was powered by a BBQ propane tank

Hi Doug I have played with the other fuels but its another story I wont share here for obvious reasons ;-) I am surprised in way they want liquid fuels for safety reasons as at least gas wont form an oil slick ;-) oh well... just make sure all the lines are good and tight and cant spring a leak unde...
by Viv
Sat Apr 09, 2011 6:30 pm
Forum: Valveless pulsejet forum
Topic: homemade jet bathtub that was powered by a BBQ propane tank
Replies: 42
Views: 13427

Re: homemade jet bathtub that was powered by a BBQ propane tank

Hi Doug I think I would still go with plain old pump gas if I could, do you recall were you came across the high octane making a difference and the circumstances it was run under? we do know that ethanol mix's tend to mess with pump seals and probably alters the performance, downwards or upwards? no...
by Viv
Sat Apr 09, 2011 2:49 pm
Forum: Gas turbine forum
Topic: Jay Leno's garage, the Chrysler turbine car
Replies: 3
Views: 2220

Re: Jay Leno's garage, the Chrysler turbine car

Hi Doug Yes he has developed his passion in to some thing notable and rather fun at the same time, it must be a full time job servicing the damn things and trying to work out which one to drive next ;-) I thought he did a nice job though on the turbine cars, I always thought as a kid we would have t...
by Viv
Fri Apr 08, 2011 7:12 pm
Forum: Gas turbine forum
Topic: Jay Leno's garage, the Chrysler turbine car
Replies: 3
Views: 2220

Jay Leno's garage, the Chrysler turbine car

Jay Leno has a nice feature on the Chrysler turbine cars of the early sixties, a few nice videos and one at least 25 minutes long, very interesting and well produced.


Link to Jay Leno's garage http://www.jaylenosgarage.com/at-the-ga ... e-edition/

Viv
by Viv
Thu Apr 07, 2011 4:27 pm
Forum: Valveless pulsejet forum
Topic: homemade jet bathtub that was powered by a BBQ propane tank
Replies: 42
Views: 13427

Re: homemade jet bathtub that was powered by a BBQ propane tank

Hi Doug

That's a monster your building there ;-) what did the prototype run like? any pics, are your clamps holding the exhaust pipes able to slide due to heat expansion?

Oh and ordinary pump gas will be fine no need or high octane any thing on a pulse jet

Viv
by Viv
Tue Apr 05, 2011 12:37 am
Forum: Jet Vehicles, All Types
Topic: "Jet" pack
Replies: 31
Views: 12390

Re: "Jet" pack

Hi Metiz

As a long time biker I have crashed at a variety of speeds, I can only assume doing it in a vertical orientation is going to hurt just as much or if not more ;-)

Any way isn't a half scale RC model for pussies too? have it full scale and write your own page in history ;-)

Viv
by Viv
Mon Apr 04, 2011 7:10 pm
Forum: Jet Vehicles, All Types
Topic: "Jet" pack
Replies: 31
Views: 12390

Re: "Jet" pack

Ha! too funny Metiz we have all written a post and then forgot the press send ;-) Its six of one and half a dozen of the other basically, if you build a pack capable of getting off the ground you are then most likely yo pile it back in to the ground at high speed, so do you design the flight control...
by Viv
Wed Mar 30, 2011 4:01 pm
Forum: Jet Vehicles, All Types
Topic: "Jet" pack
Replies: 31
Views: 12390

Re: "Jet" pack

Hi Metiz Yes I know that and I know why too ;-) Why is adding some Gyros not a flight control system the same as I mentioned? fly-by-wire is pretty generic for flight control systems now as its implicit to the application, ie its not simply the replacement of physical links to control surfaces by el...
by Viv
Wed Mar 30, 2011 2:41 pm
Forum: Jet Vehicles, All Types
Topic: "Jet" pack
Replies: 31
Views: 12390

Re: "Jet" pack

If you build your jetpack in such a way that the pilot is the centre of gravity then I see no real stability issues that can't be easily overcome. So how about that money :mrgreen: Hi Metiz I don't see the pilots center of gravity as the only stabilizing influence needed when it comes to flying saf...