Sam Christensen

Mech eng. Hybrid rocketry research lead
Vice President BYU Rocketry
Former P&G Intern. Dabble in 3d printing, photography, welding, collecting radionuclides.

[Sam Christensen @SamChri51359074]

@ship_29 I mean I think they’re hoping to have a similar experience and impact on kids that KSP had. They are hoping to inspire the future generations. It’s not unreasonable to project the first mars landing for 15 to 20 years from now which would track with a 14 year old now

[Sam Christensen @SamChri51359074]

@pineapple_clock @macintogdev Bro that’s so clever

[Sam Christensen @SamChri51359074]

@charlescushmn Also looks like you’re running very fuel rich. Yellow flames towards the end is due to unburned fuel. You can solve this by decreasing the regression rate of your paraffin. (Eva is a good first step) If I had to guess, you’re limited by the regulator on your commercial GOX tank.

[Sam Christensen @SamChri51359074]

@charlescushmn Glad it didn’t explode! Very lucky. You’re correct, this is a common overlooked issue called chugging. You need a noticeable deltaP across the injector so that as combustion chamber pressure rises you don’t get backflow. Have you read Rocket Propulsion Elements by Sutton?

[Sam Christensen @SamChri51359074]

@megagoose11 Thought this was intentional… thought it might add passive stability to have the center of drag behind the center of gravity, like a reentry capsule

[Sam Christensen @SamChri51359074]

@DJSnM If you’re going through Utah, the Hill AFB museum has a blackbird, f-22, a dragon lady, f-117, a-10 and others. You’ve seen many before, but got to see them all (in my opinion)

[Sam Christensen @SamChri51359074]

@robertgraham @mightbejell0 I think it’s not correct to assume yield based on equivalent stored energy, the rest of these numbers come from Estimated actual yield. We will see if it beats out N1 but I doubt it holds a candle to Beirut.

[Sam Christensen @SamChri51359074]

@kegrocket Extra context: the flexible hose had gotten way overbent in shipping, when we straightened it out, the ptfe liner stayed distorted. Hydrostatic tested it and the liner expanded as normal. Worked to rated pressure. I think you’ll be fine as long as the weave isn’t very kinked

[Sam Christensen @SamChri51359074]

@kegrocket Not ideal as you’re over recommended bend radius, but probably won’t fail. The steel mesh provides the strength, the inner liner balloons under any moderate amount of pressure until it’s held in check by the weave.
Source: tested a similarly bent line for a hybrid to 1000psi.

[Sam Christensen @SamChri51359074]

@11K25_Energia Did you know the reason why the tiles switch to this disordered patter right at the leading edge next to the fuselage?

[Sam Christensen @SamChri51359074]

@milspecshitpost It’s going to be about the spur gear isn’t it

[Sam Christensen @SamChri51359074]

@milspecshitpost @OSHCutInc Spent a day at their facilities and their tube bending is excellent and fun to watch. The online tool for it is great too. Nice visualizer

[Sam Christensen @SamChri51359074]

@Xaraphim lol this has been my life the past week it’s so true.

[Sam Christensen @SamChri51359074]

@_pointyendup That filament wind is gorgeous

[Sam Christensen @SamChri51359074]

@ConanToole That is incredible. Going to build this brb

[Sam Christensen @SamChri51359074]

@CombatPigeon96 Is there a way to distribute it as a true mod pack? Looks fun

[Sam Christensen @SamChri51359074]

@CombatPigeon96 It’s painted bedliner! Much more durable than regular paint but also has that bumpy finish. It’s somewhat popular with off-roaders

[Sam Christensen @SamChri51359074]

Just finished The Legend of Zelda Tears of the Kingdom. The final boss fight is incredible! Such a fantastic game. I’m lucky to have seen no spoilers other than the reveal trailer! So much to discover. #Totk #BlindPlaythrough

[Sam Christensen @SamChri51359074]

My jaw actually dropped. Incredible

[Riccardo Rossi - IU4APB - @AstronautiCAST co-host @RikyUnreal]

Auroras, Lightning & Starlink from 10.000 km 🌍🛰️ (Apr 3)

Camera setup by #ArtemisII Crew
Raw photos courtesy of the ESRS @NASAEarth @NASA_Johnson
ID ART002-E-25501 to 25518
Edit by Riccardo Rossi (ISAA)

Enjoy!
@astro_reid @Astro_Christina @AstroVicGlover @Astro_Jeremy @NASAAdmin

[Sam Christensen @SamChri51359074]

@briansessa Nice, seems like a good design. I’m with BYU Propulsion Research and BYU rocketry, if you’re down, we’d love to chat sometime and compare notes!