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.

Casing size:
Type
Total impulse (Ns)
Burn duration (s)
Peak thrust (lb)
Delay times (s)
Propellant type
P29-1G New!
56
1.8
15
12,9,7,5,3
Classic™
55
1.90
8
12,9,7,5,3
Imax™
51
1.42
10
14,11,9,7,5
Blue Streak™
41
1.07
16
11,8,6,4,2
Smoky Sam™
57
0.96
16
12,9,7,5,3
White Thunder™
 New!
53
1.7
11
12,9,7,5,3
White™
56
0.45
32
14,11,9,7,5
Vmax™
P29-2G 
108
1.89
19
12,9,7,5,3
Classic™
107
1.29
22
14,11,9,7,5
Blue Streak™
84
0.96
19
11,8,6,4,2
Smoky Sam™
116
0.93
38
13,10,8,6,4
White Thunder™
108
1.61
21
13,10,8,6,4
White™
93
1.15
25
14,11,9,7,5
Skidmark™
110
0.45
65
14,11,9,7,5
Vmax™
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
Vmax™
 New!
143
4.4
15
9,6,4,2
Mellow™







John Coker's summary of rocket flight physics.

Ejection charge data (not verified, cobbled together from several TRF threads):

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

    Black powder for reloads:
      AT
         29/40-120 ejection charge - 0.7 grams (unofficial, measured by user)
       24/40 ejection charge - 0.2 grams (unofficial, measured by user)
       24-29mm single use - 0.7 grams (official)
       29-38mm reloads - 1.4 grams (official)
       54mm reloads - 2.1 grams (official)

     CTI
        
Pro24 ejection charge - 0.6 gram of FFFFg (official)
      Pro29 ejection charge - 1.2 grams of FFFFg (official)
      Pro38 ejection charge - 1.3 grams of FFFFg (official)
      Pro54 ejection charge - 2.0 grams FFFFg (official)

Estes PS-II components via BEC on TRF:

    Based on the four kits I have (two built, two in the bag):

    2.00 inch OD tubing, 0.040 wall thickness (lower Ventris, upper Argent)
    2.50 inch OD tubing, 0.040 wall thickness (upper Ventris, lower Argent)
    3.00 inch OD tubing, 0.040 wall thickness (Leviathan)
    4.00 inch OD tubing, 0.050 wall thickness (Mega Red Max)

    Nose cones:

    2 inch (Argent) 2 inch shoulder, 9 3/4 inches exposed length
    2.5 inch (Ventris) about 2 1/2 inch shoulder, 9 3/4 inches exposed length
    3 inch (Leviathan) about 3 inch shoulder, 9 inch exposed length
    4 inch (Mega Red Max) 4 inch shoulder, 16 1/2 inch exposed length

    2 to 2.5 inch transition (Ventris, Argent) 2 inch shoulder: 2 inches, exposed transition: 2 1/4       inches, 2.5 inch shoulder: 2 1/2 inches

Depron pointers from Frank/burkefj:
I get mine from rcfoam.com In boxes of 10 or 20 it is around $8 or $9 a sheet. for 6mm and about $5 or $6 for 2mm.