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Semi-Procedural Engines
Within an engine Class, fix point designs rather like tooling a proctank.
Variables: size (affects mass, thrust, cost), nIgnitions (affects cost), others?
Once you've fixed a design, you can upgrade it as you unlock techs.
Classes:
A: Alcohol/LOx atmospheric engine (US style). Primitive, but less so than Russian-style. Examples include A4, A6, XLR11 (Bell X-1).
a: Alcohol/LOx atmospheric engine (Russian style). Cheap'n'easy for the low TLs. Examples include RD-100 series.
B: Small hypergolic sustainer engine. Examples include Aerobee and very early AJ-10s.
C: Small methalox vacuum engine. E.g. RL10-CH₄.
D: Pressure-fed hypergolic vacuum engine. Examples include AJ10 family (Able, Delta, Apollo SPS...).
E: Large hypergolic vacuum engine. E.g. LR91 (Titan II onwards).
F: Huge kerolox atmospheric engine. Examples include E-1, F-1.
G: Pump-fed hypergolic vacuum engine. Examples include Agena (Bell XLR81).
H: Staged-combustion hydrolox sustainer engine. E.g. RS25.
J: Large hydrolox vacuum engine. E.g. J-2.
K: Kerolox atmospheric engine (not huge). Examples include X405, LR79/89/H-1, LR87 (Titan I), Merlin1.
L: Kerolox sustainer engine. Examples include LR105, RD-108.
M: Huge hydrolox vacuum engine. E.g. M-1.
N: Large staged-combustion kerolox engine. E.g. NK series.
n: Medium staged-combustion kerolox engine. E.g. NK-9.
O: Staged-combustion hypergolic vacuum engine. E.g. RD-0210 (Proton upper stage).
P: Staged-combustion hypergolic engine. E.g. Proton (RD-253 etc.).
Q: Throttleable small hydrolox vacuum engine. Based on RL10 deep-throttling projects (e.g. for Lunex).
R: Small hydrolox vacuum engine. E.g. RL10.
S: Small staged-combustion kerolox engine. E.g. RD-58.
T: Large hypergolic atmospheric engine. E.g. LR87 (Titan II onwards).
U: Staged-combustion methalox sustainer engine. E.g. Raptor, BE-4.
V: Kerolox vacuum engine. E.g. LR91 (Titan I), Merlin1Vac.
W: Kerosene/peroxide pump-fed vacuum engine. Examples include British Gamma 2.
X: Kerosene/peroxide pump-fed atmospheric engine. Examples include British Gamma 8 and Stentor.
Y: Large staged-combustion kerolox vacuum engine. E.g. NK-V series.
y: Medium staged-combustion kerolox vacuum engine. E.g. NK-9V.
Z: Throttleable hypergolic vacuum engine. E.g. LMDE.
Still to configure: CU
Letters not used: Ibcdefghijklmopqrstuvwxz
Tech Tables:
Orbital Rocketry
ST AaB
PW AaB
ER aB
BR Aa
56 Aa D KL WX
58 D KL WX
59 D GK V X
60 D KL W
61 D GK V X
62 E G LT
63 V
64 DE T
65 E GKLTV
66 WX
67 FG L
70 E TVWX
72 D K T
76 F
81 E WX
86 D GKL
92 WX
98 V
04 K VW
09 K V
14 K V
NF F
Staged Combustion
SC S
64 nO S y
66 OPS
67 OPS
69 Nn Yy
70 P
72 Nn SYy
81 PS
86
92 P
98
04 P
09 Nn
14
NF
Hydrolox
PH R
EH R
IH J QR
LH J
68
72 JMQR
76 HJM
81 HJ
86 H M
92 H QR
98 H R
09 J QR
NF J
+1 J
+2 J
+3 J