Cheat Notes

I decided to make a new page to store the factoids that I just can't seem to remember....

Thrust-to-Weight Charts via ROL Info-Central.

Motor Impulse Classes (via the r.m.r. FAQ)

Low       High        Low         High      200 ISP Propellant
            Limit      Limit      Limit        Limit            Weight
           (NtSec)    (NtSec)    (lbsSec)     (lbsSec)    (grams)   (lbs)
      =    =======    ========   =========   =========   ========   =======
      A        1.26        2.5       0.28         0.56        1.3    0.0028
      B        2.51        5.0       0.56         1.12        2.5    0.0056
      C        5.01       10.0       1.13         2.25        5      0.0112
      D       10.01       20.0       2.25         4.5        10      0.02
      E       20.01       40.0       4.5          9          20      0.04
      F       40.01       80.0       9           18          41      0.09
      G       80.01      160.0      18           36          82      0.18
      H      160.01      320.0      36           72         163      0.36
      I      320.01      640.0      72          144         326      0.72
      J      640.01    1,280.0     144          288         652      1.44
      K     1280.01    2,560.0     288          575       1,305      2.88
      L     2560.01    5,120.0     575        1,151       2,609      5.75
      M     5120.01   10,240.0   1,151        2,301       5,219     11.5
      N    10240.01   20,480.0   2,301        4,602      10,438     23.0
      O    20480.01   40,960.0   4,602        9,204      20,875     46.0
      P    40960.01   81,920.0   9,204       18,409      41,751     92.0
Q81,920.01-163,840 N·s18,416.35-36,832.70 lbf·s
R163,840.01-327,680 N·s36,832.70-73,665.39 lbf·s
S327,680.01-655,360 N·s73,665.40-147,330.79 lbf·s
T655,360.01-1,310,720 N·s147,330.79-294,661.58 lbf·s
U1,310,720.01-2,621,440 N·s294,661.58-589,323.16 lbf·sApollo launch escape rocket
V2,621,440.01-5,242,880 N·s589,323.16-1,178,646.31 lbf·s
W5,242,880.01-10,485,760 N·s1,178,646.31-2,357,292.62 lbf·s
X10,485,760.01-20,971,520 N·s2,357,292.63-4,714,585.25 lbf·s
Y20,971,520.01-41,943,040 N·s4,714,585.25-9,429,170.49 lbf·sDelta II
GEM-40 SRB
Z41,943,040.01-83,886,080 N·s9,429,170.50-18,858,340.99 lbf·s
2Z83,886,080.01-167,772,160 N·s18,858,340.99-37,716,681.97 lbf·s
3Z167,772,160.01-335,544,320 N·s37,716,681.97-75,433,363.94 lbf·s
4Z335,544,320.01-671,088,640 N·s75,433,363.94-150,866,727.88 lbf·s
5Z671,088,640.01-1,342,177,280 N·s150,866,727.89-301,733,455.77 lbf·sSpace Shuttle SRB
6Z1,342,177,280.01-2,684,354,560 N·s301,733,455.77-603,466,911.54 lbf·s

1 newton = 0.224808943 pounds force
1 pound force = 4.44822162 newtons


Speed of Sound (via Wikipedia)

AltitudeTemperaturem·s−1km·h−1mphknots
Sea level15 °C (59 °F)3401225761661
11 000 m−20 000 m
(Cruising altitude of commercial jets,
and first supersonic flight)
−57 °C (−70 °F)2951062660573

AeroTech Delay Chart
Hobbyline delay cheat sheet

Aerotech 24mm RMS nozzle dimensions, via Sailor Bill on the TRF Archive
Motor / Nozzle P/N / OD X Throat X Exit
D9 / 1250 / 0.865 X 0.086 X 0.190
E11 / 1250 / " X 0.086 X 0.190
E18 / 1300 / " X 0.104 X 0.250
E28 / 1350 / " X 0.141 X 0.313
F12 / 1250 / " X 0.086 X 0.190
F24 / 1300-1 / " X 0.125 X 0.250 DRILLED to new throat dimension
F39 / 1350-2 / " X 0.166 X 0.250 DRILLED to new throat dimension
From the AeroTech resorces page of assembly Drwgs. and the RCS Order form
Refresher on grain geometries via the Apogee Peak of Flight Newsletter #341.

P29-3G 
164
1.82
35
12,9,7,5,3
Classic™
168
1.94
31
12,9,7,5,3
Imax™
138
1.31
29
14,11,9,7,5
Skidmark™
159
1.35
35
15,12,10,8,6
Blue Streak™
163
1.23
43
14,11,9,7,5
Blue Streak™
159
1.27
39
14,11,9,7,5
Red Lightning™
125
0.96
41
14,11,9,7,5
Smoky Sam™
166
1.02
49
14,11,9,7,5
White Thunder™
168
3.12
24
10,7,5,3
White Longburn™
159
2.97
27
12,9,7,5,3
Red Lightning™
168
0.41
118
14,11,9,7,5

John Coker's summary of rocket flight physics.

Black powder in Estes motors:
    13mm motors - 0.4g
    18mm motors - 0.6g
    24mm motors - 1.0g