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Old May 20, 2011, 11:58 PM
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Yeah! The extra weight of the anchor overboard will make it dive real fast!
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Old May 20, 2011, 11:59 PM
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Narwhal,

The short answer to your question is, yes. Model the data as best you can, and make sure your D2 has the tested, actual data.

I must ask, is the gas flammable?

It's not everyday someone attempts a lighter than air vehicle, am looking forward to seeing it.

Cheers

Mark
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Old May 21, 2011, 12:38 AM
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Originally Posted by Mick Molloy View Post
Narwhal,

The short answer to your question is, yes. Model the data as best you can, and make sure your D2 has the tested, actual data.

I must ask, is the gas flammable?

It's not everyday someone attempts a lighter than air vehicle, am looking forward to seeing it.

Cheers

Mark
Thanks for your reply Mark. The gas is an interesting question, I originally designed the airship to use Hydrogen however for the purposes of the outback challenge Helium will be fine to use. This is one of the reasons I wanted to know if I could resubmit Deliverable 1 if it got rejected, I would love to use Hydrogen for a variety of reasons however I will accept that Helium is safer and more than adequate for this mission.
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Old May 21, 2011, 10:22 PM
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Hi everyone,
A couple of questions from us at Monash UAS:

How much detail do we need to provide in D1 about the overall design? Do we need complete specs of the aircraft or will a basic layout suffice?
We are planning to use one airframe as a testbed in the next few months, while our final airframe is still being designed and constructed (hopefully by November). Does this affect our deliverables? Do we just complete the deliverables using our proposed final airframe design?
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Old May 22, 2011, 07:48 AM
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2.4ghz video is no longer allowed right? what are you guys using instead?
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Old May 22, 2011, 09:58 PM
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2.4ghz video is no longer allowed right? what are you guys using instead?
2.4ghz analog you mean? I would think that a digital camera operating over a digital connection (say Wifi bridge) would still be fine, as long as it is within the transmission power limits dictated by the ACMA. Or an analog camera with an onboard ADC/DSP unit operating over a digital connection would work, but would be more expensive and complex.

I'm quite fond of the FH-10z camera, but I think sampling, encoding and compressing the feed in real time would become pretty demanding for most microcontrollers.
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Old May 23, 2011, 03:02 AM
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thanks butterS, Yes I meant analogue just audio and video transmission (without the complexity of encoding video to streaming codecs and such) I want to know what people have already used/allowed to use or have successfully or intend to use in the comp.

thanks
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Old May 23, 2011, 04:48 AM
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C'mon Aero, thats part of the challenge and the learning curve.
Jump on the ACMA website and have a read, all the answers are there.
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Old May 24, 2011, 08:09 AM
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Quote:
The gas is an interesting question, I originally designed the airship to use Hydrogen however for the purposes of the outback challenge Helium will be fine to use. This is one of the reasons I wanted to know if I could resubmit Deliverable 1 if it got rejected, I would love to use Hydrogen for a variety of reasons however I will accept that Helium is safer and more than adequate for this mission.
The ultimate design is up to you, I can't comment on that. However, I will add that all teams need to think about fire safety, fire planning, and account for various scenarios. Whilst we have the local fire brigade on standby, and they are aware of the event and possible hazards and scenarios, it's also a teams responsibility to ensure fire safety as well.

Quote:
How much detail do we need to provide in D1 about the overall design? Do we need complete specs of the aircraft or will a basic layout suffice?
We are planning to use one airframe as a testbed in the next few months, while our final airframe is still being designed and constructed (hopefully by November). Does this affect our deliverables? Do we just complete the deliverables using our proposed final airframe design?
The details are up to you. I can't outline other than what is in the rules. Refer to section 6.1 for deliverable 1.

In respects to the platform - The platform of interest is the platform you intend to use for the mission at the competition.

Cheers

Mark
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Old May 25, 2011, 12:26 AM
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Originally Posted by AeroM'ck'y View Post
thanks butterS, Yes I meant analogue just audio and video transmission (without the complexity of encoding video to streaming codecs and such) I want to know what people have already used/allowed to use or have successfully or intend to use in the comp.

thanks
I think you should look at this document. It outlines the spectrum allowed to be used by anyone without needing a license, with the maximum transmission EIRP and the use (with some limitations applied).

You could attempt to apply for an amateur radio operator license, which may allow you to transmit at higher EIRPs on those frequencies. However, when we were dealing with ACMA last year it was a painful and drawn out process, so I would recommend applying ASAP.

Edit: Also this thread looks like it may help you a lot: http://www.rcgroups.com/forums/showt...1219610&page=2
Edit2: after reading most of that thread... maybe not.
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Old May 25, 2011, 08:32 AM
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The ultimate design is up to you, I can't comment on that. However, I will add that all teams need to think about fire safety, fire planning, and account for various scenarios. Whilst we have the local fire brigade on standby, and they are aware of the event and possible hazards and scenarios, it's also a teams responsibility to ensure fire safety as well.
Can a team consist of 1 person?
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Old May 29, 2011, 05:46 AM
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Yes, a team can consist of 1 person.

I'm also sure an experienced spotter will be provided for teams if they do not have a spotter for their flights also.

cheers

Mark
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Old May 29, 2011, 09:20 PM
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"The general principal is that when teams are being assessed, such as during static scrutineering flight scrutineering and competition flights all transmitting equipment must be switched off."

Other than thsi reference, there appears to be no other explanation of "static scrutineering". We would imagine it to be some kind of visual inspection to determine that the vehicle has been built and wired in a reliable fashion.

Is there any chance that we could have some examples of what previous scrutineers found to be good practice and what they found to be bad practice? Sometimes, these things can be quite subjective.

Dr S
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Old May 30, 2011, 03:24 AM
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Quote:
"The general principal is that when teams are being assessed, such as during static scrutineering flight scrutineering and competition flights all transmitting equipment must be switched off."

Other than thsi reference, there appears to be no other explanation of "static scrutineering". We would imagine it to be some kind of visual inspection to determine that the vehicle has been built and wired in a reliable fashion.

Is there any chance that we could have some examples of what previous scrutineers found to be good practice and what they found to be bad practice? Sometimes, these things can be quite subjective.

Dr S
For the past 3 years, teams that have made it through Deliverable 2, get sent a comprehensive scrutineering check sheets.

It outlines everything to be covered in scrutineering from static, through to flight checks, what to expect etc. The information sheets given to teams are exactly the same as the scrutineers use on the day of competition etc. Additional updates are given at the morning & afternoon briefings each day of the competition.

Cheers

Mark
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Old May 30, 2011, 04:49 PM
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Is there any chance you could post a copy of one of these sheets? Again, can we have examples of what could be considered "good" practice? Patricularly in terms of Connectors, shielding, mounting (batteries / electronics).

Would it be fair to say that anything that has been considered normal RC practice is acceptable?

DrS
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