Tom Dahl

Professional software engineer and aerospace enthusiast

[Tom Dahl @TFDahl]

@FutureJurvetson My grandfather was a scientist aboard the Maud, sister ship of the Fram a century ago or so.

[Tom Dahl @TFDahl]

@CollectingTrek I have hundreds of similar film clips bought from Lincoln Enterprises, they are some of my favorite possessions.

[Tom Dahl @TFDahl]

@SketchUp @MarsVikingTeam @airandspace @NASA_Langley @museumofflight @casciencecenter @VaAirandSpace @matthewshindell @FutureJurvetson Here are a few more views of the meteorology instruments and related components.

[Tom Dahl @TFDahl]

I completed modeling the meteorology science instruments for my W-I-P Viking '75 Mars lander #3D @SketchUp model. Special thanks to @MarsVikingTeam for reference docs!
@airandspace
@NASA_Langley
@museumofflight
@casciencecenter
@VaAirandSpace
@matthewshindell
@FutureJurvetson

[Tom Dahl @TFDahl]

@sanzdzld The lander's Guidance Control and Sequencing Computer (GCSC) used plated wire memory. The lander's tape recorder used a metal tape to tolerate the heat sterilization procedure (about 240 F).

[Tom Dahl @TFDahl]

Just completed a video about the Radioisotope Thermoelectric Generators (RTGs) on the Viking '75 Mars lander
@SketchUp
@MarsVikingTeam
@airandspace
@NASA_Langley
@museumofflight
@casciencecenter
@VaAirandSpace
@matthewshindell
@FutureJurvetson
https://t.co/EEahvJCFHR

[Tom Dahl @TFDahl]

@sanzdzld Fully fueled, the orbiter and lander-capsule pair mass was about 3,527 kg. After landing (when most lander propellant had been expended) the lander mass was about 600 kg. When in Mars orbit after the lander capsule had been released the orbiter mass was about 900 kg.

[Tom Dahl @TFDahl]

@sanzdzld Here are websites with good information:
NASA: https://t.co/e438PdEnyo
Wikipedia: https://t.co/sGxY3ZNfOD

[Tom Dahl @TFDahl]

@sanzdzld Hello Star. You may use short portions of my videos and a few of my still images in your video, so long as: 1) you credit the work to me, Tom Dahl, and 2) your video is respectful of the Viking project (not a parody, not presenting false facts or sensationalism).

[Tom Dahl @TFDahl]

@pierantonio_20 @SketchUp @MarsVikingTeam @airandspace @NASA_Langley @museumofflight @casciencecenter @VaAirandSpace @matthewshindell @FutureJurvetson Hi @pierantonio_20 Very sorry that I did not see your question until just now. If it is not too late, yes you have my permission to use my RTG model renderings in your thesis work.

[Tom Dahl @TFDahl]

@casciencecenter Thanks for being so fantastic @casciencecenter and for featuring the Viking missions. Here is an album of photos of your test lander unit that I was delighted to capture during research visits a few years ago https://t.co/CbsJhUXvSS

[Tom Dahl @TFDahl]

@Apollo17gallery Apollo used the SNAP-27 type RTG. I recently created a detailed video about the slightly smaller SNAP-19 RTGs used by the @NASA Viking landers on Mars in the 1970s and 80s
https://t.co/EEahvJCFHR

[Tom Dahl @TFDahl]

@Nick_Stevens_Gr Looks good, Nick! Thank you for featuring my work-in-progress model on your feed. I have created a few detailed videos about Viking and posted them on my YouTube page:
https://t.co/quIjUkeGio

[Tom Dahl @TFDahl]

@LMSpace @NASA Congratulations to the team at what was then known as Martin Marietta, and to all Vikings everywhere! Here are renders of my long-term project to create a high-fidelity digital model of the Viking lander and preserve the Viking legacy. @MarsVikingTeam

[Tom Dahl @TFDahl]

@Nick_Stevens_Gr The Planetary Society's @exploreplanets Casey Drier @CaseyDreier did a study some time ago about the total Apollo program costs. I don't know if he (or anyone) has a breakdown to testing vs. other line items.

[Tom Dahl @TFDahl]

Overall views of the installed RTGs and wind covers for my W-I-P Viking '75 Mars lander #3D @SketchUp model. @MarsVikingTeam @airandspace @NASA_Langley @museumofflight @casciencecenter @VaAirandSpace @matthewshindell @FutureJurvetson

[Tom Dahl @TFDahl]

Wind covers for the Radioisotope Thermoelectric Generators (RTGs) for my W-I-P Viking '75 Mars lander #3D @SketchUp model.
@MarsVikingTeam @airandspace @NASA_Langley @museumofflight @casciencecenter @VaAirandSpace @matthewshindell @FutureJurvetson

[Tom Dahl @TFDahl]

SNAP-19 Viking Radioisotope Thermoelectric Generator (RTG) for my W-I-P Viking '75 Mars lander #3D
@SketchUp
model.
@MarsVikingTeam
@airandspace
@NASA_Langley
@museumofflight
@casciencecenter
@VaAirandSpace
@matthewshindell
@FutureJurvetson

[Tom Dahl @TFDahl]

@tedstryk The canister is actually the Collector head Shroud Unit which encapsulated the Viking surface sampler collector head to keep it free of Earthly contamination until after landing. Here are photos and measurements of a unit I examined at @NASA_Langley https://t.co/5luOnRGNJE

[Tom Dahl @TFDahl]

@casciencecenter That is an incredible aircraft! Here is an album of photographs that I captured in 2013:
https://t.co/O3IgrI47rq