Search found 1097 matches

by Lamp
Fri Sep 07, 2018 10:35 am
Forum: Australian Rocketry
Topic: Australian Rocketry shipping container pre-order announcement
Replies: 29
Views: 2419

Re: Australian Rocketry shipping container pre-order announcement

Hmm, looks like a drag race is in our futures... :mrgreen: I drag raced myself cause I’m cool like that :lol: A drag race...sure :wink: Pity Sirbrad is not L3 or we would have ourselves an L3 Micromaxx drag race :lol: I’ll most likely lose, last time I tried to launch LPR I tried 4 ignitors in 2 di...
by Lamp
Tue Sep 04, 2018 6:02 pm
Forum: Australian Rocketry
Topic: Australian Rocketry shipping container pre-order announcement
Replies: 29
Views: 2419

Re: Australian Rocketry shipping container pre-order announcement

Hey Blake, having already ordered some Estes motors, i’ll get you to put some micromaxx motors in for me. I won’t need any of them until Thunda...
by Lamp
Sat Jul 21, 2018 8:27 pm
Forum: Thunda Down Under 2019
Topic: What is your project for Thunda Down Under 2019?
Replies: 49
Views: 6303

Re: What is your project for Thunda Down Under 2019?

After all the manic last minute building to get the 1:1 scale Sparrow/Arcas two stage built in time to fly at the last Thunder, I have no plans. I’m so busy at the moment maybe I could manage an Estes “Alpha” and/or “Big Bertha”...
by Lamp
Mon Jul 10, 2017 11:49 am
Forum: Support & Recovery & Misc.
Topic: Thrust:Weight ratio in OR
Replies: 10
Views: 2955

Re: Thrust:Weight ratio in OR

Hi Frank, Some motors have a very different initial peak thrust compared to the average thrust, for example, I know the Aerotech I200W has an average thrust of around 45 pounds but the initial thrust is over 100 pounds. Different motors have different curve shapes depending on the motor length, the ...
by Lamp
Tue May 02, 2017 9:58 am
Forum: Mid/High Powered Rocketry
Topic: The Magic Pre-Launch Check List
Replies: 15
Views: 1871

Re: The Magic Pre-Launch Check List

A checklist is only as good as you make it. To put every conceivable step into a generic checklist would make it unwieldy to use and besides, part of understanding your rocket and its preparation for flight is all part of becoming a good rocketeer. I am NOT saying a checklist is not a good idea, wha...
by Lamp
Wed Apr 19, 2017 10:51 am
Forum: Melbourne Amateur Rocket Society Inc.
Topic: MARS April Launch
Replies: 13
Views: 1790

Re: MARS April Launch

Looks like it was a great launch, pity I missed it. I have had so little free time over the last few months it has been hard to do anything other than work but that should change in a few weeks...next time!
by Lamp
Fri Mar 31, 2017 8:52 am
Forum: How to's
Topic: Different Epoxy for Different purpose??
Replies: 26
Views: 3611

Re: Different Epoxy for Different purpose??

For an L1 rocket (unless you are doing a glass tip to tip or rolling your own tube) all you really need is "hobby" epoxy like BSI. Blake sells this in the Aus rocketry shop. I tend to use either the 15 min or 30 min stuff to make sure I have enough working time. For higher strength require...
by Lamp
Sun Mar 26, 2017 7:10 am
Forum: Electronics
Topic: Jolly Logic Chute Release
Replies: 8
Views: 1311

Re: Jolly Logic Chute Release

OTT is correct, the reefed main will act as a drogue and depending on the type, configuration and length of your shock chord, your shock chord will also lower your decent speed. These things will not be taken into account by any of the simulation programs and they will all indicate you need a drogue...
by Lamp
Wed Mar 15, 2017 10:31 am
Forum: Higher, Faster, Further
Topic: 8" Fincan
Replies: 67
Views: 9191

Re: 8" Fincan

Congratulations Nic and the team.
Your builds are always exceptional Nic! :mrgreen:
by Lamp
Wed Mar 15, 2017 10:22 am
Forum: Mid/High Powered Rocketry
Topic: Stability, nose weight, and fin size at mach 1+ speeds
Replies: 30
Views: 3062

Re: Stability, nose weight, and fin size at mach 1+ speeds

I have not studied this anywhere near enough. A few years ago I built a 38mm min diameter with short span trapezoidal fins which had a static stability margin of 1.4 and a min calculated stability margin of 1 (in Rocksim). I launched it in WA and it flew beautifully until the Mach transition at abou...
by Lamp
Wed Mar 15, 2017 5:40 am
Forum: Mid/High Powered Rocketry
Topic: Stability, nose weight, and fin size at mach 1+ speeds
Replies: 30
Views: 3062

Re: Stability, nose weight, and fin size at mach 1+ speeds

Hi TRFfan2...the short answer is yes, it is highly likely your rocket will go unstable...with a narrow fin span, as your rocket moves through the Mach transition your effective fin area will decrease. I learned this a few years ago from experience. :wink:
by Lamp
Thu Feb 02, 2017 5:54 am
Forum: Mid/High Powered Rocketry
Topic: L2 - Model Rocket
Replies: 6
Views: 1124

Re: L2 - Model Rocket

Hi Joeman, Most of the L2 and L3 kits normally come without instructions or AV bay components. I once read that the reason was that historically it was considered that if you were flying such serious motors that you wanted to fly L2 you would have enough knowledge from talking to more experienced fl...
by Lamp
Thu Aug 04, 2016 12:04 am
Forum: Low Powered Rocketry
Topic: What am I doing wrong?
Replies: 16
Views: 2462

Re: What am I doing wrong?

I think others have answered your problem, I just don't think the igniter is getting enough current. The wire "should" glow white hot under the current, but it does not matter if it lights the pyrogen and that lights the motor. Back in the early 70's we just used a short length of fine NiC...
by Lamp
Wed Aug 03, 2016 11:41 pm
Forum: Self Introductions
Topic: Heyyo from Canberra!
Replies: 7
Views: 1149

Re: Heyyo from Canberra!

Welcome to the forum OVC!

If you have any questions, just ask them and someone will answer. :D
by Lamp
Wed Aug 03, 2016 1:24 am
Forum: Self Introductions
Topic: Hello from SE Melbourne
Replies: 10
Views: 1641

Re: Hello from SE Melbourne

G'day Baq, welcome to the forum! :D As others have mentioned, the local club launch site in Victoria is near Serpentine. The main reason it is so far away is the launch site has regulatory approval and an altitude ceiling currently at 25,000'. Most of us fly high power rockets but there are also a l...

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