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by OverTheTop
Wed Mar 14, 2018 6:32 am
Forum: Hybrid - Crossbreeding Rocketry
Topic: Gilmour is using Hydrogen Peroxide as their oxidiser
Replies: 12
Views: 568

Re: Gilmour is using Hydrogen Peroxide as their oxidiser

I heard somewhere that one of the workers a Saturn 5 stage blew themselves up when they kicked a frozen lump of LOX on the test pad, not a recommended propellant handling method. I recall that the person in question lost a leg. He kicked a stalacmite that had formed on the ground from a LOX leak so...
by OverTheTop
Tue Mar 13, 2018 2:39 pm
Forum: Hybrid - Crossbreeding Rocketry
Topic: Gilmour is using Hydrogen Peroxide as their oxidiser
Replies: 12
Views: 568

Re: Gilmour is using Hydrogen Peroxide as their oxidiser

Hydrogen peroxide will continue to be used, as a monopropellant, for attitude control and in other low-thrust applications. It will probably not be used as an oxidizer for main propulsion. That statement, to me, reads "low Isp". Given that assumption I suspect either cost or availability ...
by OverTheTop
Tue Mar 13, 2018 12:34 pm
Forum: Hybrid - Crossbreeding Rocketry
Topic: Gilmour is using Hydrogen Peroxide as their oxidiser
Replies: 12
Views: 568

Re: Gilmour is using Hydrogen Peroxide as their oxidiser

I am not a chemist, but since I do hang around quite a few of them (one of the perks of designing spectrometers :roll: ) I asked a few about their thoughts on the matter. Basically their opinion was that there was not a huge difference in them from their point of view. Each will have its own foibles...
by OverTheTop
Mon Mar 12, 2018 6:39 pm
Forum: Hybrid - Crossbreeding Rocketry
Topic: Gilmour is using Hydrogen Peroxide as their oxidiser
Replies: 12
Views: 568

Re: Gilmour is using Hydrogen Peroxide as their oxidiser

This book is great for hypergolics. Not sure if it covers HTP. If it does you should get a good feel for how bad it might be: https://library.sciencemadness.org/library/books/ignition.pdf If it has nothing on HTP you will enjoy the read anyway :D Whatever they are using needs to work within whatever...
by OverTheTop
Thu Mar 08, 2018 6:42 pm
Forum: Melbourne Amateur Rocket Society Inc.
Topic: Dates for 2018
Replies: 9
Views: 903

Re: Dates for 2018

Here are the dates for Tripoli Rocketry Association launches for 2018 Launches are at the usual Serpentine launch site 15 April 6 May 3 June 1 July 5 August 2 September 6-7 October (Possible 2 Day Launch) 3-4 November (Possible 2 Day Launch) As usual, launch dates are subject to a one week postpone...
by OverTheTop
Thu Mar 08, 2018 10:51 am
Forum: Scratch Built
Topic: What weighs 2.5g and flies 430ft?
Replies: 8
Views: 311

Re: What weighs 2.5g and flies 430ft?

Very cute.

How about deleting the launch lug and building a launch tower for extra altitude? :D
by OverTheTop
Tue Mar 06, 2018 7:48 pm
Forum: Rocketry Control Room
Topic: ESA fires air breathing electric thruster
Replies: 2
Views: 160

Re: ESA fires air breathing electric thruster

Absolutely brilliant! Fantastic concept and not out-of-this-world difficult. Perfect for something like the Goce (an ESA mission, pronounced "go-chay") mission that they mention in there, and they would be able to keep it flying for a long time :D Reminds me a bit of the Bussard Ramjet, e...
by OverTheTop
Tue Mar 06, 2018 3:48 pm
Forum: News & Events
Topic: Just another launch day...
Replies: 20
Views: 557

Re: Just another launch day...

:mrgreen: :mrgreen: :mrgreen:
by OverTheTop
Tue Mar 06, 2018 2:36 pm
Forum: News & Events
Topic: Just another launch day...
Replies: 20
Views: 557

Re: Just another launch day...

It is going to be such a disappointing launch, you should go home now :mrgreen: :mrgreen: :mrgreen:

Enjoy the view :D
by OverTheTop
Mon Mar 05, 2018 6:26 pm
Forum: Melbourne Amateur Rocket Society Inc.
Topic: Dates for 2018
Replies: 9
Views: 903

Re: Dates for 2018

Hang in there for the dates Jase. Just about out. Tripoli have interleaved them with the MARS mob so as to have lots of launch options :D
by OverTheTop
Mon Mar 05, 2018 6:23 pm
Forum: Hybrid - Crossbreeding Rocketry
Topic: mars Ascent Vehicle presntation
Replies: 1
Views: 104

Re: mars Ascent Vehicle presntation

A couple of interesting things in that:
1) Surprisingly, it is only at TRL 4 currently. I would have thought it would have been higher than that at first glance.
2) Hypergolics embedded in the hybrid fuel is a cute idea. Hope it works for them.
by OverTheTop
Mon Mar 05, 2018 3:16 pm
Forum: Electronics
Topic: How to select a right diode for large current reverse bias and small current forward bias?
Replies: 5
Views: 220

Re: How to select a right diode for large current reverse bias and small current forward bias?

You just need something that will allow the forward current of the LED without destruction, and block the reverse voltage (at almost no current) when the 12V is applied. Almost any regular rectifier diode will do in that situation. A 1N4148 (or 1N914, or similar) "signal diode" will have a...
by OverTheTop
Sun Mar 04, 2018 11:19 am
Forum: News & Events
Topic: Just another launch day...
Replies: 20
Views: 557

Re: Just another launch day...

Forgot to mention. If you get time do the "Early Space" tour at KSC. Great to go through the bunkers and pads at Cape Canaveral where the Redstones were launched, and also visit the pad where the Apollo 1 incident occurred. Limited places. Need to book ahead, as turning up on the day will ...
by OverTheTop
Sat Mar 03, 2018 9:54 am
Forum: News & Events
Topic: Just another launch day...
Replies: 20
Views: 557

Re: Just another launch day...

You guys were lucky. :mrgreen: I was there for nearly a week and the F9 with Zuma kept getting delayed, as did the Heavy static fire :cry: Where did you observe the flight from? Just curious. Did manage to see Zuma fly, but from the beach about 150km north of KSC. There are a couple of Falcon Heavy ...
by OverTheTop
Fri Mar 02, 2018 4:23 pm
Forum: News & Events
Topic: Just another launch day...
Replies: 20
Views: 557

Re: Just another launch day...

Pull the other leg. It plays Jingle Bells... :D

Did you get to see the launch at KSC live?

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