An FSI F100 was really a 42F48 so an AT E50 is darn close to the performance.

The F100-0 used in the Mach 1 Dart kit was drilled a bit to get closer to actual zero staging delay. The stock F100-0 motors typically had a 2-4 sec delay since it is the bulkhead.

I believe it is physically impossible for an FSI F100 to D20 to break Mach. However it was faster than any other kit and came close enough that the casual user would believe it did.

Thank goodness we didn't have good electronics yet. It makes the magic feel more real.

In re-reading those instructions it specifically says not to check continuity of the system. The M100 (electric match or Atlas match) was a low voltage igniter that a typical incandescent light continuity circuit would trigger. Interesting they presumed folks would remember that key safety tip. No lawyers in that loop!

Jerry

Speaking of phunnie . . . . .

Sonic Boom point calculation 
program copyright 1983 Jerry Irvine 
Where to stand to hear the sonic boom! 
The answer is a donut shaped around the launch site. *Can't hear the boom 
in the hole or outside the donut. The actual reality is the donut is a 
different diameter and thickness vs time.
Boomap.bas 
Copyright 1983 Jerry Irvine
5 PRINT "Program name BOOMAP.BAS * * " 
7 PRINT " * * " 
8 DIM E(20),F(20),G(20) 
10 PRINT "PROGRAM TO DETERMINE OPTIMUM" 
20 PRINT "SONIC BOOM LISTENING POSITIONS" 
30 PRINT "BY MEANS OF A SONIC BOOM" 
32 PRINT "FOOTPRINT MAP" 
33 PRINT " * * " 
34 PRINT " * * " 
35 PRINT "" 
40 PRINT "" 
50 PRINT " * * " 
60 PRINT " * * " 
65 I=1 
70 INPUT "ENTER NUMBER OF ROCKET POSTIONS: ",N 
75 PRINT " * * " 
80 INPUT "ENTER ROCKET HEIGHT (FT): ",H 
90 INPUT "ENTER ROCKET VELOCITY (FT/SEC): ",V 
100 INPUT "ENTER SPEED OF SOUND AT LAUNCH SITE (FT/SEC): ",C 
102 A=0.0 
107 A=A+0.00025 
110 S=SIN(A) 
120 D=1/(V/C) 
130 IF S>=D THEN 150 
135 GO TO 107 
150 E(I)=H 
160 F(I)=V/C 
165 Y=TAN(A) 
166 Y=Y*H 
170 G(I)=Y 
180 I=I+1 
190 IF I>N THEN 198 
195 PRINT " * * " 
196 GO TO 80 
198 PRINT " * * " 
200 PRINT "HEIGHT(FT) * MACH N0 * DISTANCE FROM LAUNCHER" 
210 PRINT "---------------------------------------------" 
220 FOR I=1 TO N 
230 PRINT E(I),F(I),G(I) 
240 NEXT I 
250 END

Install your own line feeds and find a BASIC interpreter.