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David -

That's a sweet thrust chamber.
It's been great following your diverse blogs

Gordon R. Vaughan

So the descent engine was designed by TRW?? Who actually manufactured it?

Simon Mall

I am sort of a NASA missions enthusiast and I dont get it. When the Aquarius LM (Apollo 13) was abandonded in "earth orbit" this engine would have been left on the LM to be burned up on reentry. Did it survive reentry and was later recovered or is this a replica.

I am not try to start a war I just am confused.


Something seems amiss....
Here is a link to an image of the complete TRW TR-201 Bipropellant Rocket Engine, which was used as the descent engine on ALL Lunar Modules: "http://www.rocketrelics.com/tr201.jpg".
Valid documentation can be found HERE: "http://www.rocketrelics.com/spacecraft_componets.htm".
As you can see, the TRW TR-201 thrust chamber is completely different from the lower thrust chamber that you exhibit.
I do not wish to generate confusion, only confirm fact.

David Meerman Scott

Simon - Of course you are correct. I was not trying to say that this was the exact engine that flew on Apollo 13, just that this model engine saved the crew. I have re-written the first paragraph of the post to eliminate confusion.

RonRay - I don't understand. The thrust chamber is exactly the same as the photos in the images you include above. Of course, the item in my collection is just the thrust chamber - it does not have the valve package on top or the lower skirt on the bottom.

Scott Schneeweis

RonRay...the TRW manufactured TR-201 is derived from the heritage Lunar Module Descent Engine (LMDE) thrust chamber. Difference in appearance is due to 1) a different throttle valve actuator and propellant feed arrangement both in design and placement (on the LMDE they were mounted Parallel with to the engine centerline on the side of the TCA); the TR-201 has a simple dual Throttle Actuator mounted to the top of the engine manifold and 2) the LMDE had a Gimbal cradle mounted just below the throttle package around the throat of the TCA; the TR-201 instead uses Gimbal interfaces directly connected to bosses on the top of the engine (they are attached to the manifold head itself).

The engines do share identical thrust chambers and pintle injectors. I hold a complete TR-201 within my collection.



Sorry, I guess it is the perspective of the different images that cause them to appear different. My apologies and congratulations on owning such a RARE item!

Roger Mattson

My father was a technical writer for the LMDE project. If anyone has any pictures of the assembly of the engine in San juan Capistrano, Ca., I would appreciate an email.. Someone took all of our pictures.
I have a few very rare First Day Covers I would be willing to trade.
Thanks David for the quick reply.
Roger Mattson
[email protected]



i want to know which kind of material(metal)
usually is used in injctor plate of an liquid-propellent engine.and an sampel technical drawing of injector plate.
please help me

thancks alot

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