1st f motor

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Well-Known Member
Dec 30, 2003
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just made my 1st F motor rocket
can someone do a roc sim on it for me

its made for
BT - 70
68 inch long

and running on a 24 mm econojet F21-8w motor

how much nose wight do i need ?

all input welcome

Considering it's length, I doubt you will need any extra weight in the nose. But, that's just a guess on my part.
Same here, with that length I would be very surprised if any noseweight is needed, In fact I would be willing to bet it is already over stable,
Ill rocksim it for you tomorow morning and give you projected altitudes ect, but you will have to PM me a few details. From what I figure , it wont need any nc weight.

In the words of the late Alan Shepard, "Light this candle!"


Attached is a RockSim 5 file that should be close, since I dont have the details. You should expect an altitude around 1200 ft. AGL and you don't need any added nose weight.

I you want a better simulation file you need to post the details such as fin and nose cone measurements, launch lug location, and motor mount, parachute and other internal details.

Do you have a thrust curve file for the econojet F21-8w? I had to use a F24-7 which is similar..

Bruce S. Levison, NAR #69055
I forgot to mention that the above is a RockSim version 5 file that can be opened with the demo version of the software.

Bruce S. Levison, NAR #69055
thanks for the info.
only about 1200 feet. thats to low
maybe i'll stick that F in may Executioner
how high will that thing go ?
I ran a few RockSim simulations; the Estes Executioner should reach about 1000 ft AGL on an F motor.

Bruce S. Levison, NAR #69055
When one considers opening a video by two guys named....CORPSE and VICIOUS....:eek: :eek: maybe one should CLEAR the room first....or wait till LATE AT NIGHT!!!!;) GOOD VIDEOS GUYS!!!! Your rockets ROCK and the camera work is EXCELLENT!!! :D How much damage do the rockets sustain coming in from those heights on streamers?
very little damage

its fixed allready

i forgot the parachute.

if you think those ROCKED what tell the next vidoes

VICIOUS is going with a 3 F21-w4 cluster

thats going to ROCK!

will keep you posted