Search found 539 matches

by skyfrog
Tue Jan 16, 2007 5:13 am
Forum: Gas turbine forum
Topic: Jetbeetle X-150 nearing completion!
Replies: 10
Views: 10051

test run

Thank you Anders and Zippiot for your warm support. During the past period of x150 project, I received many supportive emails from all over the world, they were and still will be in the future, the true driving force of this self-suficient project. We made oem parts for survival during the past, thi...
by skyfrog
Mon Jan 08, 2007 1:38 am
Forum: Rocket forum
Topic: Blue Origin Test flight video
Replies: 4
Views: 4482

Propellant

Thanks Aaron and Mark.

If they are using H2O2, this rocket can only play around at several tens of meters high just like they did in the video.

I think the current make is for testing the control system only, ie to control the lift off, hovering and landing etc.
by skyfrog
Sun Jan 07, 2007 2:31 am
Forum: Rocket forum
Topic: Blue Origin Test flight video
Replies: 4
Views: 4482

propellant

Do you have any idea of what kind of propellants tthis rocket are used ? hydrogen peroxide ?
by skyfrog
Wed Jan 03, 2007 3:17 pm
Forum: Off topic forum
Topic: Earthquake prove aquarium
Replies: 8
Views: 4161

dog's face

Thanks for the article, yeah when feeding the knife fish did behave that way. My experience they don't chase the live food (small fish), instead they move slowly to the prey, pretending nothing gonna happen, once the range is close enough they burst out the suction power from their mouth. Very inter...
by skyfrog
Tue Jan 02, 2007 3:33 pm
Forum: Gas turbine forum
Topic: Been a while - new project, T04 Gas Turbine.
Replies: 215
Views: 181929

nice job

Gee, that's really fun with a furnace and sand moulding equipment in house !
by skyfrog
Tue Jan 02, 2007 4:23 am
Forum: Off topic forum
Topic: Earthquake prove aquarium
Replies: 8
Views: 4161

Re: Voltage

Yes you wouldn't want your weakly electric knifefish to become highly electricfied. ha http://tinyurl.com/ygs44f http://tinyurl.com/y72b96 "and three species of "weak" electric freshwater fish. He intends to use Black ghost knifefish, Elephantnose fish and Clown knifefish" http://www.uwsp.edu/news/...
by skyfrog
Tue Jan 02, 2007 4:17 am
Forum: Off topic forum
Topic: Earthquake prove aquarium
Replies: 8
Views: 4161

Re: quake

I was in Athens Greece and slept through one. I woke up in the morning and walking down the hall way I kept stepping on stuff ...It was the chalk board from the walls...The building had twisted the doors out of the jams...... Jim Sounds like a grade 6 (250 - 400 gal) earthquake. Windows distored, h...
by skyfrog
Thu Dec 28, 2006 5:04 pm
Forum: Off topic forum
Topic: Earthquake prove aquarium
Replies: 8
Views: 4161

Re: Earthquake prove aquarium

Lucky for you and the fish! Glad your safe and everything is ok. I would suggest be ready to turn off the power switch at the wall, simply if it does topple, you'll have a puddle of electrified water from your pumps/light in the tank. Turn off at the wall all unnessisary equipment that your not usi...
by skyfrog
Thu Dec 28, 2006 3:13 am
Forum: Off topic forum
Topic: Earthquake prove aquarium
Replies: 8
Views: 4161

Earthquake prove aquarium

26 Dec. 2006 southern Taiwan earthquake Quite scary but we are still kicking. It was 8:26 PM and 8:35PM we had two big earthquake strikes. It was of magnitude 7.2 and 7.1 on the Richter scale respectively. The intensity of shaking was grade 4 (25-80 gal), we experienced a small flood on the floor of...
by skyfrog
Wed Nov 29, 2006 7:19 pm
Forum: Gas turbine forum
Topic: Mw 54 Turbine Wheel Wanted?
Replies: 1
Views: 2640

re: Mw 54 Turbine Wheel Wanted?

Hi, Have you got your wheel yet, if not, we have plenty of them, 100% compatible and more powerful : http://cgi.ebay.com/ebaymotors/55mm-Turbine-wheel-for-model-RC-jet-engine-builder_W0QQitemZ200052495030QQihZ010QQcategoryZ26439QQssPageNameZWDVWQQrdZ1QQcmdZViewItem We have NGV too, http://cgi.ebay.c...
by skyfrog
Wed Nov 29, 2006 1:26 pm
Forum: Tools and Construction
Topic: Help with lathe decision
Replies: 4
Views: 3067

re: Help with lathe decision

Hi, That lathe looks pretty old you might not be able to find accessories that match it. Before you make any decision, maybe you should gather more info from these sites : http://www.mini-lathe.com/Default.htm http://groups.yahoo.com/group/7x10minilathe/ Budget for a mini lathe : $300 to $500 Regards,
by skyfrog
Wed Sep 06, 2006 5:16 am
Forum: Off topic forum
Topic: A sad day for reptiles...
Replies: 13
Views: 6201

re: A sad day for reptiles...

Yeah a sad day for sure. Next time be careful attending stingray feeding tours.

He will be missed.
by skyfrog
Thu Aug 03, 2006 5:05 pm
Forum: Gas turbine forum
Topic: Left Hand Threads?
Replies: 5
Views: 4011

re: Left Hand Threads?

Hi you have kamps' book that's good but be sure to understand everything before you set off making and testing your own turbine, that's my sincere advise.
by skyfrog
Sat Jul 29, 2006 8:01 am
Forum: Gas turbine forum
Topic: preload
Replies: 6
Views: 4692

re: preload

Hi radial clearance of course refers to clearance in the ball races. The existance of radial clearance is a big problem in high speed, especially when we are using the ball race bearings to run far beyond its rating RPM. We are saying to run at 150-170K RPM. The axial force on the bearings is not us...
by skyfrog
Sat Jul 29, 2006 2:17 am
Forum: Gas turbine forum
Topic: preload
Replies: 6
Views: 4692

re: preload

Hi Preload is used to remove radial clearance which has bad influences on bearing life as radial clearance will cause vibration and noise.

So it is preload that made the bearings to last longer in high rpm.