Adam Grendys

an amateur expert

[Adam Grendys @AdamGrendys]

@njanne19 Yeah all control authority comes from one, contra-rotating propeller stack. With the gimbal we get pitch and yaw, and by individually varying propeller speeds we get roll control.

[Adam Grendys @AdamGrendys]

First free flight!!! This team is just incredible

[Adam Grendys @AdamGrendys]

And they’re already doing diverts days after the first hop

[Adam Grendys @AdamGrendys]

@Exquisite265 It’s not our best work… Aerial Stabilization Through Regulated Actuation

[Adam Grendys @AdamGrendys]

I cannot give enough credit to our GNC, Avionics, an Structures teams who’ve built and rebuilt this vehicle into something that really works

[Astrobotic @astrobotic]

We fired a really cool rocket engine - and broke some records while we were at it. 🔥This Rotating Detonation Rocket Engine produced more than 4,000 pounds of thrust, and included a 300-second continuous burn, which is believed to have set the record for longest duration hot firing of an RDRE engine to date. Watch it fire:
https://t.co/dL1PgEplTQ

[Adam Grendys @AdamGrendys]

Finished off with a long duration burn

[Adam Grendys @AdamGrendys]

@pintleinjector Yep just the cheapest automotive guy you can find, so far it hasn’t needed to be replaced

[Adam Grendys @AdamGrendys]

The team has been testing our new IPA-GOx torch igniter and it’s beautiful

[Adam Grendys @AdamGrendys]

@Erdayastronaut 🥲

[Astrobotic @astrobotic]

The Astrobotic team recently completed a series of successful hot-fire tests using a flight-representative replica of Griffin-1’s full propulsion system. 🔥Throughout the test campaign, the main engines supplied by @FrontierAero fired 229 pulses. These tests validated engine performance and delivered essential data using firing profiles representative of actual flight conditions.

Griffin’s propulsion system uses a hypergolic bipropellant architecture with two fuel tanks and two oxidizer tanks, all pressure-fed by three helium pressurant tanks. During key mission phases, both the main engines and the attitude control system (ACS) thrusters will fire in pulsed modes to achieve maneuvers like the powered descent to the lunar surface. These critical tests were carried out at @exquadrum's FORGE testing facility, located at Southern California Logistics Airport.

Watching Griffin’s engines ignite is an exciting step forward in bringing this infrastructure-class lander online for the nation.

[Adam Grendys @AdamGrendys]

Always has been..

[Scott Manley @DJSnM]

It's all tubes.

[Adam Grendys @AdamGrendys]

I think the trip will always be too short

[Adam Grendys @AdamGrendys]

@USFinalFrontier University of Washington for the SpaceVision conference, and I don’t want to leave

[Adam Grendys @AdamGrendys]

How is this even a real campus

[Adam Grendys @AdamGrendys]

This past Saturday our GNC testbed ASTRA performed its first roll control tests

[Adam Grendys @AdamGrendys]

I should post on here more often

[Purdue Space Program: A SEDS Chapter @purdue_seds]

Last semester, Active Controls successfully demonstrated a throttled engine as part of the Collegiate Propulsive Lander Challenge. We are now carrying that momentum forward as we race toward future milestones, including the upcoming build of our lander vehicle, TOAD.

[Adam Grendys @AdamGrendys]

FAR too many

[Space 8K @uhd2020]

Too many stars

[Adam Grendys @AdamGrendys]

It was quite a day for my first time at FAR

[Project KegRocket @kegrocket]

Normal FAR day yesterday: Leave at 3am. Get to FAR. Sleep in car. Get woken up by BPS static fire. Jerry rig ground support equipment for the British Empire. Get the scoop from the zoomers. Big chungus crashes. Liquid flies to 20 cm. Totaly brass rocket engine appears. It flies.