Quantcast

Q-Jet Picture

The Rocketry Forum

Help Support The Rocketry Forum:

Scott_650

Well-Known Member
Joined
Sep 16, 2015
Messages
830
Reaction score
333
Over at Chris Michielssen Model Rocket Building blog there's an update on Aerotech/Quest Q-Jet 18mm composite engines! No release date for the A/B engines and the C/D engines are mentioned as well....can't wait for these to start shipping!

https://modelrocketbuilding.blogspot.com
 

rstaff3

Oddroc-eteer
Joined
Jan 18, 2009
Messages
11,759
Reaction score
14
As and Bs are ready to be sent for NAR testing...Cs and Ds will follow. I want those Ds!
 

Nytrunner

Pop lugs, not drugs
TRF Supporter
Joined
Oct 15, 2016
Messages
7,751
Reaction score
3,377
Location
Huntsville AL
As and Bs are ready to be sent for NAR testing...Cs and Ds will follow. I want those Ds!
Saw the news on BuyRocketMotors' facebook page too.
I wonder what kind of D's they'll be.

Rstaff, have you not used the D10 or D21?
 

Scott_650

Well-Known Member
Joined
Sep 16, 2015
Messages
830
Reaction score
333
I have rockets in the fleet I can't wait to try the D's with and rockets in the build pile that should fly very nicely on a composite D.
 

rstaff3

Oddroc-eteer
Joined
Jan 18, 2009
Messages
11,759
Reaction score
14
Saw the news on BuyRocketMotors' facebook page too.
I wonder what kind of D's they'll be.

Rstaff, have you not used the D10 or D21?
I have used the d21 and the d13/24 in the rms case. I am hoping these are a tad cheaper than the old su and easier to deal with than the rms. I would like a d12 or so.

Sent from my SAMSUNG-SGH-I337 using Rocketry Forum mobile app
 

shreadvector

Well-Known Member
Joined
Jan 19, 2009
Messages
9,061
Reaction score
236
When comparing the Estes motors, PLEASE look at the actual average thrust level as tested by NAR and listed on the S&T website. The average thrust is actually lower than the number in the motor name, as that number is a holdover from the original versions in the 1960's/1970's. For instance, the Estes A8 is *NOT* an "8".

The new Aerotech motors will need to meet the new requirements which do not allow gross differences between certified/tested average thrust and the number on the motor. Therefore the AT A3 and B4 sound very interesting and I would love to see the thrust time curve.


I have used the d21 and the d13/24 in the rms case. I am hoping these are a tad cheaper than the old su and easier to deal with than the rms. I would like a d12 or so.

Sent from my SAMSUNG-SGH-I337 using Rocketry Forum mobile app
 

gdjsky01

Whoosh, pop: life is good
TRF Supporter
Joined
Jan 20, 2011
Messages
4,849
Reaction score
18
Shread I am missing something
Why would anyone want 18mm A-C composites? What is the advantage? They are STILL 18mm.
I would 'get it' if they were 13mm. But why would I care about A-C 18mm?
Its not taking advantage of greater composite specific impulse.
So is this just 'ooooh shiny new?'
 

shreadvector

Well-Known Member
Joined
Jan 19, 2009
Messages
9,061
Reaction score
236
We will know how much we care once we have real data:

Price
Thrust/time curve
Black smoke?

Quest sold a lot of kits and bulk packs of motors to schools and youth groups.

If the price is right and they are easy to use and provide "Wow" factor, then they will sell a lot.

Shread I am missing something
Why would anyone want 18mm A-C composites? What is the advantage? They are STILL 18mm.
I would 'get it' if they were 13mm. But why would I care about A-C 18mm?
Its not taking advantage of greater composite specific impulse.
So is this just 'ooooh shiny new?'
 

Initiator001

Well-Known Member
Joined
Jan 19, 2009
Messages
2,902
Reaction score
167
Shread I am missing something
Why would anyone want 18mm A-C composites? What is the advantage? They are STILL 18mm.
I would 'get it' if they were 13mm. But why would I care about A-C 18mm?
Its not taking advantage of greater composite specific impulse.
So is this just 'ooooh shiny new?'
The Quest product line needs motors.

It is now too expensive/difficult to import BP motors from China or Germany.

AeroTech knows how to make composite propellant motors.
They have to be 18mm diameter to work in Quest kits.
These motors will also work in brand 'E' and other companies' 18mm motor mount rockets.

Performance is not the issue. Compatibility is.
 

RIB

Well-Known Member
Joined
May 3, 2017
Messages
63
Reaction score
0
Shread I am missing something
Why would anyone want 18mm A-C composites? What is the advantage? They are STILL 18mm.
I would 'get it' if they were 13mm. But why would I care about A-C 18mm?
Its not taking advantage of greater composite specific impulse.
So is this just 'ooooh shiny new?'

I guess you never heard about competition rocketry
 

dhbarr

Amateur Professional
Joined
Jan 30, 2016
Messages
6,959
Reaction score
1,422
I guess you never heard about competition rocketry
Perhaps it's non obvious to people who don't compete why a composite C in 18mm with a higher burnout mass is more useful than a BP C in 18mm.
 

dhbarr

Amateur Professional
Joined
Jan 30, 2016
Messages
6,959
Reaction score
1,422
Ever hear about specific impulse?
Everybody who asks questions has never heard of contest flying or ISP. Got it.

Excited to put these right next to my composite 18mm D's, even though I clearly don't understand where the fire comes from.
 
Top