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Altitude Predictions for TI-83
This program is used on a TI-83 Graphing Calculator, it may also work on lower models (e.g. TI-82). The only thing you need to do is change the ROOTs to the actual root symbol. Mass is in kilograms, diameter is in meters. Altitude is in Meters, speed in M/S. This is the VERY basic version, it will be improved to include graphs and a much more user friendly interface, but this is it for now. ALTSIM v1.0

:INPUT "BODY DIAMETER",D
:INPUT "ROCKET MASS",R
:INPUT "THRUST (N)",T
:INPUT "IMPULSE (N-S)",I
:INPUT "ENGINE MASS",E
:INPUT "PROPELLANT MASS",P
:R+E-P->
:R+E-(.5*P)->M
(.5*1.22*.75*(Pi*((.5*D)^2)))->K
:(ROOT((T-(M*9.81))/K)->Q
:((2*K*Q)/m)->X
:(I/T)->B
:(Q*(1-e^(-X*B))/(1+e^(-X*b)))->V
:((-M/(2*K))*ln((T-(M*9.81)-(K*V^2))/(T-(M*9.81)))->Y
:(((Z)/(2K))*ln(((Z*9.81)+(Z*V^2))/(Z*9.81)))->C
:ROOT((Z*9.81)/K)->U
:ROOT((Z*9.81)/Z)->U
:((tan^-1((V)/(A)))/U)->W
:Lbl 1
:Menu("ALTSIM","REVIEW INPUTS",2,"GO TO OUTPUTS",3,"QUIT",4)
:Lbl 2
:Output(1,1,"BDIAMETER:")
:Output(1,11,D)
:Output(2,1,"M ROCKET:")
:Output(3,1,"THRUST:")
:Output(3,7,T)
:Output(4,1,"IMPULSE:")
:Output(4,8,I)
:Output(5,1,"M ENGINE")
:Output(5,8,E)
:Output(6,1,"M PROPELLANT")
:Output(7,1,P)
:Pause
:Goto 1
:Lbl 3
:Disp "ALTITUDE:"
:Disp Y+C
:Disp "BURN TIME"
:Disp (I/T)
:Disp "TOP VELOCITY"
:Disp V
:Disp "[ENTER]"
:Disp "TO CONTINUE"
:Pause
:Disp "COASTING TIME:"
:Disp A
:Disp "BURNOUT ALTITUDE:"
:Disp Y
:Disp "COAST DISTANCE"
:Disp C
:Disp "[ENTER]"
:Disp "TO RETURN TO MENU"
:Pause
:Goto 1
:Lbl 4
:Menu("ARE YOU SURE?","NO",5,"YES",6)
:Lbl 5
:Goto 1
:Lbl 6
:END

-Ben Emerson
questions? E-mail: wildmanben@homestead.com

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