Rocketfest XVIII is on Sunday 26th May

Low and Mid power rocketry just outside of Melbourne

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rockets4u
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Location: Melbourne

Rocketfest XVIII is on Sunday 26th May

Postby rockets4u » Sun May 12, 2013 1:12 pm

Rocketfest XVIII is on Sunday 26th May

Again it must be six months, definately overdue, here is the news:

We have discovered the floor of controlled airspace at the pad is 8,500 feet, a tad more than the 400 feet we previously knew was safe. The limiting factor now becomes retrieving rockets and not littering our landlord’s neighbours' properties with pointy litter.

So we can use bigger engines, make more noise & smoke – how terrible!

Rocketfest has always had themes like, land it close to the pad, transparent rockets etc. Last time it was the drag race, five or six rockets launched simultaneously, which went very well - I won it! & only one rocket left on the pad. A great day, we did well in that wind! Stuart sent this pic/video link of the day. No 2 is a video of the drag race:
https://picasaweb.google.com/111248983056454082633/20121021Rockets?authuser=0&authkey=Gv1sRgCJG-6vqim_WSiAE&feat=directlink

I still plan to improve the tag playing rockets, and try some heavy lifting with “Composite” motors with ~3x the power / weight compared to our usual black powder motors.

Please come at:

12 Noon - If you are a Flier

1 pm If you just want to watch Rockets.

First rocket flies at 1pm sharp!


Where:
If you have not been before & want to come pls send me a "pm" with your email address, or send an email to rockets4u@optusnet.com.au & I will send the location details.
It’s too far ahead to have any idea about the weather, so just in case, please check back here on Sunday am in case of postponement.

You are invited to fly or watch, be warned though our 20 acre site is not exactly flat and there are a "few" trees, which one of our number specialises in finding, streamers are good!

Hope to see you there!

Rockets4u
Motors to the fore. Let the air through the rocket. Fins are a drag. The paint is the payload.

krusty
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Re: Rocketfest XVIII is on Sunday 26th May

Postby krusty » Tue May 21, 2013 4:48 pm

Here's my prototype entry for the 'go small' comp....

Image

And a test flight...



Krusty

Raaahbin
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Re: Rocketfest XVIII is on Sunday 26th May

Postby Raaahbin » Tue May 21, 2013 5:39 pm

That's impressive... but, what makes it stable? It looks symmetrical around the half-way horizontal plane, so shouldn't the CP be in the middle? And the CG aft of it?

But can't argue with how it flies!
TRA L2 | AMRS L2
TRA #13936
MARS #28

Total Impulse (Ns):
2017: 2826 (55% L)
2016: 2006 (78% K)
2015: 2809 (55% L)
2014: 1565 (61% K)

rockets4u
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Joined: Mon May 19, 2008 11:49 pm
Location: Melbourne

Re: Rocketfest XVIII is on Sunday 26th May

Postby rockets4u » Tue May 21, 2013 11:43 pm

Love it very much in the spirit of Rocketfest.

Think I have seen something like it before, but can't remember where. Is it stabilised by differential drag from the two disks rather than the boring old COP COG business?

Like the way you have bent the igniter to minimise the length of the rocket on the pad! :lol:

Looks like this is going to be a festive one & Karl is going to need a micrometer.

Tumble recovery?
Motors to the fore. Let the air through the rocket. Fins are a drag. The paint is the payload.

krusty
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Joined: Tue Nov 27, 2007 12:21 pm
Location: Noble Park, Vic, Australia
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Re: Rocketfest XVIII is on Sunday 26th May

Postby krusty » Tue May 21, 2013 11:56 pm

To be honest, I have no idea how these things are stable!!!

But they do work :)

I wouldn't consider the igniter to be part of the rocket height ;)

Krusty


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