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


Reply
 
Thread Tools Search this Thread Display Modes
  #1  
Old 05-08-2009, 08:04 PM
jgonza jgonza is offline
Junior Rocketeer
 
Join Date: May 2009
Location: missouri
Posts: 9
Default altitude predictor

I use mark sullivans altitude predictor to figure the flight characteristics for my rockets. The problem is the delay that is given is often a second or more too long. I build my rockets with aerodynamics in mind. no sloppy fillets and smooth paint why would the delay be so wrong. ex. 47mm body, 457.2 mm chute 353g liftoff weight with a f39-9 motor. the site i use gives 8.1 seconds from ignition to turnover, motor burns for 1.3 sec. so adelay of 6.8 should be appropriate, yet it falls for 1.1 seconds when i use a 7 sec delay, is the predictor innacurate or am i missing something?
Reply With Quote
Reply


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 02:10 PM.


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