Ye Olde Rocket Forum

Go Back   Ye Olde Rocket Forum > The Doctor is In! > Ask the Doctor
User Name
Password
Auctions Register FAQ Members List Calendar Today's Posts Search Mark Forums Read


 
 
Thread Tools Search this Thread Display Modes
Prev Previous Post   Next Post Next
  #1  
Old 07-07-2017, 09:42 PM
Bituminous Bituminous is offline
Junior Rocketeer
 
Join Date: Jul 2017
Posts: 5
Exclamation Here is why I might try my Estes Saturn V on a D12-0 ... help

Hi Folks. This is my first time posting.

The big question is will a D12-0 booster have enough "oompph" to eject the 'chutes??

I will lay out the scenario with data and supporting video. All of these shots in the vidoes were with D12-3 motors

(#1) Beautiful first flight before paint and decal. 448 g (15-3/4 oz) with engine
https://youtu.be/ZQ4WOqvZe5Y

(#2) Not so great flight after paint and decal. 456 g (16-1/8 oz) with engine
https://youtu.be/sS_xpEk-9HU

(#3) Even worse. Shaved off 4g down to 452 g (16 oz) with engine
https://youtu.be/bPoxUuf8MMk

(#4) Made some measurements, estimations and calculations and determined the Cg was too close to the Cp. So I added a weight into the nose. 490 g (17-1/4 oz) with engine. Cg around 17 inches from base. Cp estimated to be 13.4 inches from base. Slightly better flight.
https://youtu.be/AZapV6Vs1qw

Based on #4, it looks like apogee is right when burn is done so I was thinking a D12-0 would minimize the amount of drift back down before ejection.....the catch though is the D12-0 would have to have enough force to eject the 'chute and nose stage.

Thoughts?

I am debating about holding the rocket in my hand and firing to see if it will eject in a low-er risk environment, but that would probably violate some sort of NAR code. How can I fix it in place such as on my sawhorse without messing up the finish?
Reply With Quote
 


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump



All times are GMT -5. The time now is 03:05 AM.


Powered by: vBulletin Version 3.0.7
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Ye Olde Rocket Shoppe © 1998-2024