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Search: Posts Made By: Jane-DoH
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Forum: Tech Log
4th Apr 2011, 07:49
Replies: 51
Views: 14,849
Posted By Jane-DoH

Machinbird In terms of exhaust...

Machinbird



In terms of exhaust velocity, you're right. Regardless, rockets aren't air breathing, and this engine is.



High chamber pressures would be consistent with a rocket right?
Forum: Tech Log
4th Apr 2011, 02:25
Replies: 51
Views: 14,849
Posted By Jane-DoH

Machinbird As I understand the Scimitar...

Machinbird

As I understand the Scimitar doesn't have a rocket-cycle...
Forum: Tech Log
3rd Apr 2011, 19:12
Replies: 51
Views: 14,849
Posted By Jane-DoH

Machinbird Scimitar

Machinbird



Scimitar
Forum: Tech Log
3rd Apr 2011, 05:19
Replies: 51
Views: 14,849
Posted By Jane-DoH

Looking at the design, it clearly uses...

Looking at the design, it clearly uses exhaust-gasses to drive the aft-fan turbine; does it use exhaust-gasses to drive the core turbine, or does it use hydrogen expansion to drive the turbine? ...
Forum: Tech Log
25th Mar 2011, 18:46
Replies: 51
Views: 14,849
Posted By Jane-DoH

Any idea how resistant this thing would be to...

Any idea how resistant this thing would be to FOD? With that intercooler in the front, it looks like it would do pretty poorly...
Forum: Tech Log
22nd Mar 2011, 18:06
Replies: 51
Views: 14,849
Posted By Jane-DoH

MG23, While it may not be economical, most...

MG23,

While it may not be economical, most cool ideas aren't exactly economical either. The American SST program was an awesome design, and had there not been all those tree-hugging hippies...
Forum: Tech Log
20th Mar 2011, 03:39
Replies: 51
Views: 14,849
Posted By Jane-DoH

Why does the LAPCAT A2 fly at such a low...

Why does the LAPCAT A2 fly at such a low altitude? While 85,000 feet is high up, for Mach 5 it seems relatively low...
Forum: Tech Log
18th Mar 2011, 00:46
Replies: 51
Views: 14,849
Posted By Jane-DoH

mike-wsm How exactly does that work,...

mike-wsm



How exactly does that work, increase density, then increase the RPM due to the density change, or to allow it to pull in more air, or something else?
Forum: Tech Log
17th Mar 2011, 01:37
Replies: 51
Views: 14,849
Posted By Jane-DoH

I don't know exactly how this relates to this but...

I don't know exactly how this relates to this but I remember reading something Paul Czysz mentioned about a pre-cooling system which entailed cooling the airflow into the engine above Mach 1.8 to...
Forum: Tech Log
16th Mar 2011, 02:12
Replies: 51
Views: 14,849
Posted By Jane-DoH

mike-wsm Well, the methanol injection...

mike-wsm



Well, the methanol injection was ATREX, not SABRE or Scimitar. Regardless, yes, it is a very complicated engine.



So, the air goes one way, and the coolant goes the opposite...
Forum: Tech Log
14th Mar 2011, 04:04
Replies: 51
Views: 14,849
Posted By Jane-DoH

mike-wsm Yeah, it's hot enough... ...

mike-wsm



Yeah, it's hot enough...

BTW: Dunno about the SABRE or Scimitar, but the ATREX, as I understand it to combat frost were using some kind of methanol injection system
Forum: Tech Log
13th Mar 2011, 21:44
Replies: 51
Views: 14,849
Posted By Jane-DoH

Machinbird Glad to be of help. ...

Machinbird



Glad to be of help.



Okay the equation would go like this
1.) T0 = 220 (1 + 0.2(M)^2)
Forum: Tech Log
13th Mar 2011, 01:08
Replies: 51
Views: 14,849
Posted By Jane-DoH

mike-wsm Fascinating design, though puzzling...

mike-wsm

Fascinating design, though puzzling if you ask me. Firstly the inlet that it has seems to have a tiny throat with what must be enormous duct pressures, I don't know why you'd have so...
Forum: Tech Log
12th Mar 2011, 15:20
Replies: 51
Views: 14,849
Posted By Jane-DoH

mike-wsm Yesterday, I stumbled upon another...

mike-wsm

Yesterday, I stumbled upon another link which better illustrates both the SABRE and Scimitar Engines as well as the aircraft designs involved :ok:

Voila!...
Forum: Tech Log
11th Mar 2011, 23:46
Replies: 51
Views: 14,849
Posted By Jane-DoH

mike-wsm I've been looking for this...

mike-wsm



I've been looking for this for a long time! Thanks

Out of curiosity, do you remember anything about the Japanese ATREX engine, which had a pre-cooler and worked on a...
Forum: Tech Log
11th Mar 2011, 23:17
Replies: 51
Views: 14,849
Posted By Jane-DoH

mike-wsm Heat Exchanger, Scimitar Engine...

mike-wsm

Heat Exchanger, Scimitar Engine (Not-Classified) (http://www.reactionengines.co.uk/downloads/Heat%20exchanger%20development%20at%20REL%20IAC%2008%20C4.5.2.pdf)

Page 2 discusses the...
Forum: Tech Log
11th Mar 2011, 07:47
Replies: 51
Views: 14,849
Posted By Jane-DoH

balsa model Well, it isn't. Still, I...

balsa model



Well, it isn't. Still, I wouldn't want to be junking too many spacecraft. There are only so many resources available on earth.



I wasn't comparing the loss of an expendable...
Forum: Tech Log
11th Mar 2011, 01:40
Replies: 51
Views: 14,849
Posted By Jane-DoH

mike-wsm The Scimitar doesn't have a...

mike-wsm



The Scimitar doesn't have a rocket-cycle. I don't really understand what the function of a pre-burner would be without a rocket cycle.



Yeah me neither. Especially with the...
Forum: Tech Log
10th Mar 2011, 01:29
Replies: 51
Views: 14,849
Posted By Jane-DoH

mike-wsm I'm not sure exactly what measures...

mike-wsm

I'm not sure exactly what measures they have put in place to deal with icing, but they have talked about dealing with that issue.

BTW: The pre-burner is only used with the...
Forum: Tech Log
9th Mar 2011, 01:09
Replies: 51
Views: 14,849
Posted By Jane-DoH

MG23 Yes, I am aware of this. I was...

MG23



Yes, I am aware of this. I was pointing out that this kind of technology wasn't relegated only to SSTO's, but hypersonic air-breathing aircraft as well.


balsa model
Forum: Tech Log
8th Mar 2011, 03:19
Replies: 51
Views: 14,849
Posted By Jane-DoH

The Scimitar isn't intended as an SSTO engine;...

The Scimitar isn't intended as an SSTO engine; it's a pre-cooled variable cycle engine (turbojet/turbofan) to power a hypersonic airliner as part of the E.U.'s LAPCAT program.
Forum: Tech Log
7th Mar 2011, 03:31
Replies: 51
Views: 14,849
Posted By Jane-DoH

Why would the air be uncompressible?

Why would the air be uncompressible?
Forum: Tech Log
6th Mar 2011, 04:26
Replies: 51
Views: 14,849
Posted By Jane-DoH

Reaction Engines Sabre/Scimitar

These are pre-cooled turbojet engines; they use a pre-cooler that uses liquid helium to cool down the airflow going into it, the heat is transferred to liquid hydrogen which acts as a heat sink --...
Showing results 1 to 23 of 23


 
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