Search found 1926 matches

by Kryten
Wed Nov 29, 2017 9:14 am
Forum: Scratch Built
Topic: bodytube inner surface and ejection charge - heat protection
Replies: 14
Views: 444

Re: bodytube inner surface and ejection charge - heat protection

Back on topic: I suspect the discoloration/charring may be related to undercure of the resin. Your comment that it gets sticky when hot supports this. Since it's already had 2 successful flights, and you're only using low power motors, it looks like you'll probably get away with it. If the apparent ...
by Kryten
Wed Nov 22, 2017 9:58 am
Forum: Scratch Built
Topic: bodytube inner surface and ejection charge - heat protection
Replies: 14
Views: 444

Re: bodytube inner surface and ejection charge - heat protection

https://firescienceblog.com/tag/fabric-flammability/ When scanning the internet, I came across a great article in the Fall 2011 edition of On Track! magazine, which you may have some familiarity with. The article is titled, “Safe Batting Choices for Baby and Invalid Quilts,” by Beth Kurzava. The ar...
by Kryten
Tue Nov 14, 2017 2:57 pm
Forum: Scratch Built
Topic: bodytube inner surface and ejection charge - heat protection
Replies: 14
Views: 444

Re: bodytube inner surface and ejection charge - heat protection

I would think that would not be a good idea. It’s polyester cloths that are known to be very dangerous if they catch fire. It's the first time I've heard this. Can you provide a link to the source of this information? Not sure how much the resin varies but obviuosly from your previous report it’s n...
by Kryten
Sat Nov 11, 2017 11:51 am
Forum: Air Command Water Rockets
Topic: Filming rockets at apogee
Replies: 4
Views: 201

Re: Filming rockets at apogee

8)
Awesome work - as usual!
by Kryten
Sat Oct 14, 2017 4:36 pm
Forum: NSW Rocketry Association
Topic: Launch Day 7th October
Replies: 2
Views: 312

Re: Launch Day 7th October

It was a great morning of launching - 32 rockets in total.
Recoveries were all quite close, despite a little bit of breeze.
George has put the photos on the website: http://www.nswrocketry.org.au/gallery/2 ... s_Oct.html
by Kryten
Wed Oct 11, 2017 2:46 pm
Forum: Scratch Built
Topic: holes in rocket body tube - how they affect aerodynamics
Replies: 5
Views: 303

Re: holes in rocket body tube - how they affect aerodynamics

OverTheTop wrote:I think I have seen someone using a servo to release a hatch on a design somewhere.

You're probably thinking of a system used in water rockets.
Check out the AirCommand website for details of various deployment mechanisms
by Kryten
Wed Oct 11, 2017 2:42 pm
Forum: Scratch Built
Topic: half DVD fins
Replies: 5
Views: 286

Re: half DVD fins

SpaceManMat wrote:Neat idea, was expecting from the title to see very shiny fins.

Yep - me too.
Otherwise, I don't see the point of using non-conventional materials of construction
by Kryten
Thu Oct 05, 2017 3:50 pm
Forum: News & Events
Topic: Inside the Most Exclusive High-Powered Rocketry Event in America
Replies: 2
Views: 318

Re: Inside the Most Exclusive High-Powered Rocketry Event in America

Technically the wording is correct - we don't have "waivers" in Australia :wink:
by Kryten
Wed Sep 27, 2017 9:08 am
Forum: NSW Rocketry Association
Topic: Launch Day 7th October
Replies: 2
Views: 312

Launch Day 7th October

There will be a launch day at Whalan Reserve on Saturday 7th October, to replace the cancelled September launch day
by Kryten
Wed Sep 27, 2017 9:04 am
Forum: Self Introductions
Topic: hello from IOWA
Replies: 8
Views: 499

Re: hello from IOWA

Welcome, Dale.
I presume you've checked out the water rockets of "AirCommand"?
by Kryten
Fri Sep 22, 2017 3:13 pm
Forum: NSW Rocketry Association
Topic: Launch day 23rd September
Replies: 1
Views: 199

Re: Launch day 23rd September

There is a fire ban in place this weekend, so this launch is cancelled
by Kryten
Sun Sep 17, 2017 1:05 pm
Forum: NSW Rocketry Association
Topic: Launch day 23rd September
Replies: 1
Views: 199

Launch day 23rd September

Please note that our September launch will be held on Saturday 23rd, not on 30th, to avoid the October long weekend
by Kryten
Sun Sep 03, 2017 1:04 pm
Forum: Self Introductions
Topic: Hello from Montana, USA
Replies: 32
Views: 1376

Re: Hello from Montana, USA

Welcome, Steve
by Kryten
Thu Aug 24, 2017 5:54 pm
Forum: Self Introductions
Topic: Newbie here ! Hello!
Replies: 8
Views: 510

Re: Newbie here ! Hello!

Welcome aboard!
by Kryten
Wed Aug 09, 2017 12:42 pm
Forum: Scratch Built
Topic: Orion Launch Abort System (LAS) - (picture heavy).
Replies: 41
Views: 2374

Re: Orion Launch Abort System (LAS) - (picture heavy).

Actually you probably want to avoid having 2 or more charges going off at the same time. You might want to cap the charge in with epoxy on 3 of them. Sealing the end of the motor sounds like a bad idea. The clay plug is designed to be a weak point; the clay nozzle - not so much. If you wanted to pl...

Go to advanced search