Do you think it broke mach?

The Rocketry Forum

Help Support The Rocketry Forum:

rockets

Well-Known Member
Joined
Nov 18, 2014
Messages
1,252
Reaction score
31
[video=youtube;dbjV2kEfYyw]https://www.youtube.com/watch?v=dbjV2kEfYyw[/video]
This is my first MD flight from over a year ago. It was 20 inches tall, 24mm diameter, and flew on a Eliis G37-10. Lost the nose cone with altimeter. :(
SKIP TO 3:52 FOR LAUNCH I'm not sure if it went mach, and I know it's tough to tell by video, but I just want some guesses & thoughts.

Thanks,
 

dhbarr

Amateur Professional
Joined
Jan 30, 2016
Messages
7,513
Reaction score
1,947
What was the total weight?
 

rockets

Well-Known Member
Joined
Nov 18, 2014
Messages
1,252
Reaction score
31
About 4 OZ WITHOUT the motor.
Thanks,
 

Flyfalcons

Well-Known Member
Joined
Apr 14, 2015
Messages
2,547
Reaction score
774
A quickie on Thrustcurve shows 1,137 feet per second, which is right at Mach 1. So tough to tell for sure without altimeter data. Based on the spin on the way up though, I don't think that speed was realized.
 

rockets

Well-Known Member
Joined
Nov 18, 2014
Messages
1,252
Reaction score
31
What do your simulations show, based on actual launch mass?
Don't have a simulater. YES, I know that OP is free, but I couldn't download it: (It's a long story.)

Thanks,
 

timbucktoo

Well-Known Member
Staff member
TRF Supporter
Global Mod
Joined
Jun 13, 2014
Messages
8,798
Reaction score
1,570
Location
Cocoa Beach
Try downloading RocSim. They have a 30 day free trial. Also have you used ThrustCurve? That will give you a better ballpark than watching video.
https://www.thrustcurve.org


Sent from my iPhone using Rocketry Forum
 

rockets

Well-Known Member
Joined
Nov 18, 2014
Messages
1,252
Reaction score
31
A quickie on Thrustcurve shows 1,137 feet per second, which is right at Mach 1. So tough to tell for sure without altimeter data. Based on the spin on the way up though, I don't think that speed was realized.
Thanks,
 

timbucktoo

Well-Known Member
Staff member
TRF Supporter
Global Mod
Joined
Jun 13, 2014
Messages
8,798
Reaction score
1,570
Location
Cocoa Beach
So more than likely you did not bust Mach.


Sent from my iPhone using Rocketry Forum
 

rockets

Well-Known Member
Joined
Nov 18, 2014
Messages
1,252
Reaction score
31
So more than likely you did not bust Mach.


Sent from my iPhone using Rocketry Forum
Just did the sim again, and it came to about 795 MPH, but that does include the canted fins.
But, hey, that old Ellis G37 was still sweet to fly, even though I lost the rocket.
Thanks,
 

timbucktoo

Well-Known Member
Staff member
TRF Supporter
Global Mod
Joined
Jun 13, 2014
Messages
8,798
Reaction score
1,570
Location
Cocoa Beach
Just did the sim again, and it came to about 795 MPH, but that does include the canted fins.
But, hey, that old Ellis G37 was still sweet to fly, even though I lost the rocket.
Thanks,
What are you using to sim it?
 
Top