Quantcast

AeroTech Open Thread

The Rocketry Forum

Help Support The Rocketry Forum:

Rob702Martinez

Zip-Tie Oversight Committee
TRF Supporter
Joined
Dec 30, 2015
Messages
1,305
Reaction score
301
Location
Las Vegas
When using burnsim which numbers from the whitesheets do we use to get the correct representation? I notice when inputting certain numbers change when saving. I can't remember which one is the one to use. Any help?
 

Ethan

Well-Known Member
Joined
Jan 28, 2009
Messages
304
Reaction score
5
When using burnsim which numbers from the whitesheets do we use to get the correct representation? I notice when inputting certain numbers change when saving. I can't remember which one is the one to use. Any help?
1604039155141.png
 

AeroTech

Lifetime Supporter
TRF Lifetime Supporter
Joined
Dec 17, 2009
Messages
311
Reaction score
517

Tractionengines

Active Member
Joined
Aug 29, 2020
Messages
33
Reaction score
12
Aerotech, I have read thru a lot of posts, and see various bits of information... Can you please officially confirm the size of the BP ejection charges in the Quest motors. In another thread you posted the following quotes, but did not give what the size is. (I am not going to post values I have found in other posts, so not to give incorrect values; But will be watching for your response.)

"The -6 and -8 second delays have a smaller ejection charge to avoid damaging body tubes in the smaller rockets they are usually used in. The -4 second delays have a larger ejection charge because they are normally used in larger, heavier rockets. "

"Yes, it applies to the Black Max Cs and Ds and also the new upcoming WL versions."

Thank you.
Mike
 

AeroTech

Lifetime Supporter
TRF Lifetime Supporter
Joined
Dec 17, 2009
Messages
311
Reaction score
517
They all have 0.25 gram ejection charges except the C & D motors with 4 second delays, which have 0.50 gram ejection charges.

Aerotech, I have read thru a lot of posts, and see various bits of information... Can you please officially confirm the size of the BP ejection charges in the Quest motors. In another thread you posted the following quotes, but did not give what the size is. (I am not going to post values I have found in other posts, so not to give incorrect values; But will be watching for your response.)

"The -6 and -8 second delays have a smaller ejection charge to avoid damaging body tubes in the smaller rockets they are usually used in. The -4 second delays have a larger ejection charge because they are normally used in larger, heavier rockets. "

"Yes, it applies to the Black Max Cs and Ds and also the new upcoming WL versions."

Thank you.
Mike
 

Tractionengines

Active Member
Joined
Aug 29, 2020
Messages
33
Reaction score
12
One more set of questions for a different rocket. For the 24mm & 29mm Standard Singe Use motors. I see a lot of references that they have 0.7grams in the ejection charge. Please confirm ?
Can the soft plastic plug be removed, and the PB charge "adjusted" on the Single Use type, or is that a "modification" and therefor against the NAR Rules?

The PB calculators are showing I only need 0.3 gram.

For ref. The rocket is a 1.6" Loc IRIS, (So 1.5" dia. ID, and 10" long parachute section with (1) 2-56 nylon shear pin.)
 
Last edited:

AeroTech

Lifetime Supporter
TRF Lifetime Supporter
Joined
Dec 17, 2009
Messages
311
Reaction score
517
Yes, the larger mid-power motors include 0.7 grams of ejection charge. We have traditionally allowed experienced customers to adjust the ejection charge as needed for their particular rocket.

One more set of questions for a different rocket. For the 24mm & 29mm Standard Singe Use motors. I see a lot of references that they have 0.7grams in the ejection charge. Please confirm ?
Can the soft plastic plug be removed, and the PB charge "adjusted" on the Single Use type, or is that a "modification" and therefor against the NAR Rules?

The PB calculators are showing I only need 0.3 gram.

For ref. The rocket is a 1.6" Loc IRIS, (So 1.5" dia. ID, and 10" long parachute section with (1) 2-56 nylon shear pin.)
 

John Kemker

Well-Known Member
TRF Supporter
Joined
Aug 25, 2019
Messages
1,619
Reaction score
686
Are there any RASP or equivalent thrust-curve files for the H13? I'd like to sim a few rockets in OpenRocket with that sweet motor!
 

Neutron95

Well-Known Member
TRF Supporter
Joined
Jan 17, 2010
Messages
236
Reaction score
64
What are the theoretical limits of Warp 9 endburners? Some of my friends online have been making some silly 98mm endburners in Openmotor that then give absolutely absurd altitudes when simulated, on the order of apogees in excess of 500,000 feet.
 

Ulexis

Well-Known Member
TRF Supporter
Joined
Sep 26, 2019
Messages
134
Reaction score
239
Location
West Central MN
I have launched 3 Q-Jet motors in my Estes MAV. The last two flights have resulted in a bulge in the case. Is this because the rocket has no motor mount tube? And, should I not be using these with this rocket because of this?
20200915_081734.jpg
 

Initiator001

Well-Known Member
Joined
Jan 19, 2009
Messages
2,881
Reaction score
134
I have launched 3 Q-Jet motors in my Estes MAV. The last two flights have resulted in a bulge in the case. Is this because the rocket has no motor mount tube? And, should I not be using these with this rocket because of this?View attachment 437343
I have flown my Estes MAV with C12 and D16 Q-Jets with no casing issues.
 

BEC

Well-Known Member
Joined
Feb 19, 2009
Messages
3,303
Reaction score
345
Location
Auburn, WA
I have launched 3 Q-Jet motors in my Estes MAV. The last two flights have resulted in a bulge in the case. Is this because the rocket has no motor mount tube? And, should I not be using these with this rocket because of this?
View attachment 437343
I have flown well over 100 Q-Jets and I have had this happen to me twice. There is a batch of motor cases where this sort of thing happened from time to time. It's not because of the MAV's motor mount arrangement.

Get in touch with Aerotech directly and also please report these on motorcato.org.
 

AeroTech

Lifetime Supporter
TRF Lifetime Supporter
Joined
Dec 17, 2009
Messages
311
Reaction score
517
These are not CATOs, but it could happen with the original casing material from the v.1 Q-Jets. It is also more likely to happen in a rocket with no tube around the motor.

I have flown well over 100 Q-Jets and I have had this happen to me twice. There is a batch of motor cases where this sort of thing happened from time to time. It's not because of the MAV's motor mount arrangement.

Get in touch with Aerotech directly and also please report these on motorcato.org.
 

AeroTech

Lifetime Supporter
TRF Lifetime Supporter
Joined
Dec 17, 2009
Messages
311
Reaction score
517
The only limits to the motor are the nozzle and case insulation system. The rocket requirements include ensuring that the motor has enough thrust to lift it off the pad, and some ability to keep itself pointed in the desired direction.

What are the theoretical limits of Warp 9 endburners? Some of my friends online have been making some silly 98mm endburners in Openmotor that then give absolutely absurd altitudes when simulated, on the order of apogees in excess of 500,000 feet.
 

BEC

Well-Known Member
Joined
Feb 19, 2009
Messages
3,303
Reaction score
345
Location
Auburn, WA
These are not CATOs, but it could happen with the original casing material from the v.1 Q-Jets. It is also more likely to happen in a rocket with no tube around the motor.
Well....the case didn't completely fail....so I suppose technically they aren't CATOs though clearly the case isn't supposed to do that. I have had one bubble like this (in my Astrocam on August 7th - another model that does not have a full motor tube) and one blow a hole in its side and the side of my model. That one was in a full motor tube and certainly qualified as a CATO.
 

5x7

Well-Known Member
Joined
Jan 20, 2009
Messages
845
Reaction score
56
I have had so many Aerotech single use motor cases have small raised area or soft spots over the years in several different styles of casings, I can’t count. I was never worried about it, it’s likely caused by the delay burning after the propellant has burned out and exposed the liner, but the casing isn’t holding pressure, so won’t burst.
 
Last edited:

crossfire

Lifetime Supporter
TRF Lifetime Supporter
Joined
Jan 16, 2011
Messages
4,343
Reaction score
453
It kind of reminds me of the thin spots one sees on a CTI liner.
 
Top