Finding CP

[Bowhunter]

What is the best way to find a rockets CP?

 

[GL-P]

FREE-VCP
$$$-RockSim
FREE-Paper Cutout (old school)
FREE-By hand (old school)
$$$-Spacecad (can't quite remember if this is the right name)

I prefer VCP. Cheap and simple, no problems yet. Got enough features like NC profiles, transition layouts, fin alignment guides, etc

 

[brianc]

I highly recommend doing the old school hand calcs at least a few times.
You may find yourself on the flight line without a computer (or a dead battery) some day...

Here's a link to the equations-

https://my.execpc.com/~culp/rockets/Barrowman.html

 

[DynaSoar]

Originally posted by GL-P
FREE-VCP
$$$-RockSim
FREE-Paper Cutout (old school)
FREE-By hand (old school)
$$$-Spacecad (can't quite remember if this is the right name)

I prefer VCP. Cheap and simple, no problems yet. Got enough features like NC profiles, transition layouts, fin alignment guides, etc

Also: AeroCP, $10

I like VCP too, but it's got some bugs and incomplete items. Being free, these get fixed slowly. Not a slam, just an observation.

 

[teflonrocketry1]

Use a Wind Tunnel with a CP caliper.

Visit: https://www.aerorocket.com/offer.html#anchor3

Bruce S. Levison, NAR #69055

 

[GL-P]

I like VCP too, but it's got some bugs and incomplete items. Being free, these get fixed slowly. Not a slam, just an observation.

Yeah, it is an observation. A few minor bugs an some incomplete parts, don't affect program much.

 

[shockwaveriderz]

I have a 300kb excel spreahsheet that I will email yoi if you pm or email me....I found it on the web somewhere..

 

[mike_bar]

Originally posted by brianc
I highly recommend doing the old school hand calcs at least a few times.
You may find yourself on the flight line without a computer (or a dead battery) some day...

Here's a link to the equations-

https://my.execpc.com/~culp/rockets/Barrowman.html

I like this Excel spreadsheet. I will tinker with it on my own. Thank you.

I use VCP. It is buggy but it is free and gets the job done for CP. VCP has great templates too.

 

[tinteffects]

Teflon,
You have entirely TOO much liquid capital!!! Just kidding. Thats the coolest thing I've seen in a long while. Nice!!!

 

[tinteffects]

I have been trying to get VCP, and VBRUN300. Where to get them?

 

[mike_bar]

Originally posted by tinteffects
I have been trying to get VCP, and VBRUN300. Where to get them?

Look here for a link to VCP home page:

https://www.rocketryforum.com/showthread.php?s=&postid=161468#post161468
or
https://www.rocketryforum.com/printpost.php?s=&threadid=14684&postid=161468

Edit: fixed link

 

[Dbarrm]

Im using the MiniMag XLS to find the CP of my L2 rocket im building and it asked for Rb What is Rb and how do I measure it?

Dan

 

[mike_bar]

Originally posted by Dbarrm
What is Rb and how do I measure it?

From Cp_MinieMagg.xls:

"Rb 2.77 radius of body rear end"

Measurement, Umm, one-half the diameter of the body tube at the rear end of the sustainer.

It looks like Mr. Culp changed the name of the variable on his Web page versus his spreadsheet. On the Webpage the variable would be:

R = radius of body at aft end

https://my.execpc.com/~culp/rockets/Barrowman.html

edit: typos... my bad...