Orbiter-Forum [Project] Hybrid airship
 User Name Remember Me? Password
 Register Blogs Orbinauts List Social Groups FAQ Projects Mark Forums Read

 Addon Development Developers post news, updates, & discussions here about your projects in development.

 02-25-2019, 03:30 PM #106 Urwumpe Certain Super User Quote: Originally Posted by markp  I don't see why not. A basic approach could be to set the lifting gas mass and the structural masses could be set from the scenario file. Then by setting the lifting gas mass to zero you could have a vacuum airship. Mmm I wonder if it's really that easy. I can check if you like. Would be nice, I still have about 3 hours of work left on my shift before can test it at home. I suspect a few control functions like venting gas should no longer work. But controlling altitude by ballonets should be the same as for a hybrid.
 02-25-2019, 08:45 PM #107 markp Orbinaut So the code is designed to calculate the size the airship mesh and calculate structural masses depending on the pressure ceiling requested in the scenario file. Ballast mass is also used in the calculation. It's possible to put in a line of code to override the lifting gas mass in the calculation of the total mass. Code: liftgasmass = 0.0; airshipmass = m_structure+envelopemass+liftgasmass+ballgasmass; The size of the airship would be calculated assuming that the lifting gas is helium though.
 02-25-2019, 08:49 PM #108 Urwumpe Certain Super User Quote: Originally Posted by markp  So the code is designed to calculate the size the airship mesh and calculate structural masses depending on the pressure ceiling requested in the scenario file. Ballast mass is also used in the calculation. It's possible to put in a line of code to override the lifting gas mass in the calculation of the total mass. Code: liftgasmass = 0.0; airshipmass = m_structure+envelopemass+liftgasmass+ballgasmass; The size of the airship would be calculated assuming that the lifting gas is helium though. well - then it should be better to fork it for vacuum with vacuum pumps. The size of the ship should rather depend on payload mass, as far as I understand the physics.
 02-25-2019, 09:09 PM #109 markp Orbinaut It's also possible to set the gas density to zero in the initialisation routine that calculates the size of the airship. Not sure that's any help. Things will become clearer over the next few days I guess. Last edited by markp; 02-25-2019 at 09:23 PM.
 02-25-2019, 09:20 PM #110 Urwumpe Certain Super User Quote: Originally Posted by markp  It's also possible to set the gas density to zero in the initialisation routine that calculates the size of the airship. Yes, but it shouldn't be zero.... only close to zero.
 02-26-2019, 12:38 PM #111 markp Orbinaut Quote: Originally Posted by Urwumpe  Yes, but it shouldn't be zero.... only close to zero. Yes quite. Setting the gas density to 'zero' seems to work although the ballonet size remains fully inflated as the airship rises because the pressure on the envelope is negative. Do you have any idea of the equivalent areal density for the envelope of such a vacuum airship on Mars? From terrestrial rigid airships I get around 5-6 kg/m2 for a very crude calculation of an areal density (surface area / structural mass).
 02-26-2019, 12:49 PM #112 Urwumpe Certain Super User Not what you expect likely, but does this fairly new paper help you? https://ntrs.nasa.gov/archive/nasa/c...0180006789.pdf Its about how to estimate the masses and its pretty interesting in terms of design. But it does not contain sample data.
 02-26-2019, 01:07 PM #113 markp Orbinaut Yes that looks very interesting, thanks! There seems to be some numbers from their study on page 37 that might help.
 02-26-2019, 01:13 PM #114 Urwumpe Certain Super User Oh yes, did not see them when going over the pages. The deployment also looks interesting there.
 02-28-2019, 02:28 PM #115 markp Orbinaut So I get about 0.2 kg/m2 for their areal density which is very good compared to non-rigid airship numbers of 0.35-0.52 kg/m2 quoted on page 5 of a paper available online called, "A methodology for determination of baseline specifications of a non-rigid airship".
 Thanked by:
 02-28-2019, 02:30 PM #116 markp Orbinaut Also working on a cargo container for delivering the airship to different places airship_box.jpg Last edited by markp; 02-28-2019 at 02:34 PM.
 02-28-2019, 02:44 PM #117 Urwumpe Certain Super User Quote: Originally Posted by markp  Also working on a cargo container for delivering the airship to different places Attachment 16437 Not "Airship inside"? If you want to know a real joke: Thieves managed to steal a trailer with a registered hot air balloon near my place. I really wonder where they want to sell it.
 02-28-2019, 03:24 PM #118 markp Orbinaut Quote: Originally Posted by Urwumpe  Not "Airship inside"? If you want to know a real joke: Thieves managed to steal a trailer with a registered hot air balloon near my place. I really wonder where they want to sell it. That's pretty bizarre.
 03-01-2019, 09:47 PM #119 markp Orbinaut OK so now an airship has been delivered to Mars packed up nicely in some cargo containers. Who's going to unpack and assemble it though?
 Thanked by:
 03-12-2019, 02:43 PM #120 markp Orbinaut I now have a version of the airship that can be created in a stored configuration. The properties of the assembled airship can be set during the simulation from a 'master' cargo container. The size of the airship will depend on the amount of extra cargo containers have been delivered nearby.

 Orbiter-Forum

 Thread Tools

 Posting Rules BB code is On Smilies are On [IMG] code is On HTML code is Off You may not post new threads You may not post replies You may not post attachments You may not edit your posts
 Forum Jump User Control Panel Private Messages Subscriptions Who's Online Search Forums Forums Home Orbiter-Forum.com     Announcements     Meets & Greets Orbiter Space Flight Simulator     Orbiter Web Forum         OFMM         Orbiter Forum Space Station         Simpit Forum     General Questions & Help     MFD Questions & Help     Hardware & Software Help     Tutorials & Challenges     Orbiter SDK     Orbiter Visualization Project     Orbiter Beta » Orbiter Project Orbiter Addons     OrbitHangar Addons & Comments     Addons     Addon Development     Addon Requests     Addon Support & Bugs         Addon Developer Forums             Project Apollo - NASSP     Orbiter Lua Scripting Far Side of the Moon     Spaceflight News     Math & Physics     Astronomy & the Night Sky     Backyard Rocketry     Brighton Lounge     International Forum

All times are GMT. The time now is 09:45 PM.

 Quick Links Need Help?

 Contact Us - Orbiter-Forum - Top

About Us | Rules & Guidelines | TOS Policy | Privacy Policy

Orbiter-Forum is hosted at Orbithangar.com
Powered by vBulletin® Version 3.8.6
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
Copyright ©2007 - 2017, Orbiter-Forum.com. All rights reserved.