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by OverTheTop
Thu Jul 20, 2017 6:15 pm
Forum: Self Introductions
Topic: Long time reader, first time poster
Replies: 9
Views: 203

Re: Long time reader, first time poster

Welcome to the forum!

You seem to have a bit to keep you occupied for a little while :)
by OverTheTop
Thu Jul 20, 2017 6:15 pm
Forum: Self Introductions
Topic: Long time reader, first time poster
Replies: 9
Views: 203

Re: Long time reader, first time poster

Welcome to the forum!

You seem to have a bit to keep you occupied for a little while :)
by OverTheTop
Sun Jul 16, 2017 9:53 am
Forum: Low Powered Rocketry
Topic: D12-5 burning UNDERWATER
Replies: 1
Views: 137

Re: D12-5 burning UNDERWATER

Great video. Pressure wave at the end was a bit of a surprise!
by OverTheTop
Sat Jul 15, 2017 6:35 pm
Forum: Support & Recovery & Misc.
Topic: Multi segmented recovery
Replies: 3
Views: 199

Re: Multi segmented recovery

I think it is easier in some cases to split the recovery. Not sure if it makes any difference to reliability, but it could.

I suspect is is not done so much due to having to find two (or more) parts to the rocket. That's what puts me off. I only need one tracker if they are strung together.
by OverTheTop
Sat Jul 08, 2017 11:29 pm
Forum: Low Powered Rocketry
Topic: Launch platform
Replies: 6
Views: 124

Re: Launch platform

There are no problems with ignition (midair) with piston launchers. The rocket motor provides the gas and is lit on the launcher.
by OverTheTop
Sat Jul 08, 2017 5:50 pm
Forum: Low Powered Rocketry
Topic: Launch platform
Replies: 6
Views: 124

Re: Launch platform

Forgot to mention. You might also find something of interest if you search for "piston launcher" :)
by OverTheTop
Sat Jul 08, 2017 2:45 pm
Forum: Low Powered Rocketry
Topic: Launch platform
Replies: 6
Views: 124

Re: Launch platform

Hi RF. As Oldboy said, search "launch towers". One thing with the flat plate. Make sure the rocket does not sit down on the plate or you can end up with "Bernoulli Lock". There is a significant possibility the rocket will sit, with full thrust running, suctioned down to the plate...
by OverTheTop
Fri Jul 07, 2017 1:51 pm
Forum: Low Powered Rocketry
Topic: Model Rocket Engine In A Vacuum Chamber - will it burn?
Replies: 12
Views: 301

Re: Model Rocket Engine In A Vacuum Chamber - will it burn?

Take my hint about searching for a pdf online for a cheaper version :wink: .
by OverTheTop
Fri Jul 07, 2017 10:22 am
Forum: Rocketry Control Room
Topic: Show us your rocket room / shed / workshop
Replies: 65
Views: 9951

Re: Show us your rocket room / shed / workshop

You will wonder how you ever did without it!
by OverTheTop
Thu Jul 06, 2017 5:38 pm
Forum: Low Powered Rocketry
Topic: Model Rocket Engine In A Vacuum Chamber - will it burn?
Replies: 12
Views: 301

Re: Model Rocket Engine In A Vacuum Chamber - will it burn?

Bring back the Aerospike Engine :-)


Yep. Self-compensating for atmospheric pressure.
by OverTheTop
Thu Jul 06, 2017 3:10 pm
Forum: Low Powered Rocketry
Topic: Model Rocket Engine In A Vacuum Chamber - will it burn?
Replies: 12
Views: 301

Re: Model Rocket Engine In A Vacuum Chamber - will it burn?

Yes the thrust produced is lower because there is no air to push against Rocket engines work because of Newton's third law, not because they push on anything. Throw something out the back and an equal reactive force works forwards. The air pressure does constrain the expansion of the exhaust to a n...
by OverTheTop
Thu Jul 06, 2017 8:01 am
Forum: Low Powered Rocketry
Topic: Model Rocket Engine In A Vacuum Chamber - will it burn?
Replies: 12
Views: 301

Re: Model Rocket Engine In A Vacuum Chamber - will it burn?

As the saying goes, "Believe half of what you see and none of what you hear". The host comments that it burnt in around one second. Actual burn time was close to 2.0s as measured by my stopwatch looking at the video. The Estes C6 motor has a rated burn time (thrustcurve.org) of 1.9s So, lo...
by OverTheTop
Mon Jul 03, 2017 7:34 pm
Forum: MARS Attacks - 12 & 13 August 2017
Topic: MARS Attacks
Replies: 19
Views: 3559

Re: MARS Attacks

Is that fashion coming back? :wink:
by OverTheTop
Fri Jun 30, 2017 7:31 pm
Forum: Self Introductions
Topic: Hello All from Blue Mountains west of Sydney
Replies: 11
Views: 401

Re: Hello All from Blue Mountains west of Sydney

Welcome Alex. Looks like you are asking the right questions for your progress. Just remember you don't know what you don't know (neither do I :D ) so speak to experts in the hybrid area. I have seen one detonate so you need to proceed with safety and care.

Enjoy the journey!

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