Quantcast

Has anyone tried these

The Rocketry Forum

Help Support The Rocketry Forum:

jd2cylman

Still not Carl... ;-)
TRF Supporter
Joined
Jun 17, 2011
Messages
4,692
Reaction score
583

dhbarr

Amateur Professional
Joined
Jan 30, 2016
Messages
6,695
Reaction score
1,208
The bell retainers shouldn't krushnic or hibachi, but you will get some added drag on the tail.
 

mpitfield

Moderator
Staff member
TRF Lifetime Supporter
Global Mod
Joined
Jul 7, 2013
Messages
4,900
Reaction score
430
Location
Toronto, Ontario
If you look close enough at the rocket in my Avatar you can see the 38mm silver GLR bell retainer. I love it and love the look. I also have a black 54mm one but have hesitated on using it until I can get a clearer picture on what if any effect it has on motor performance.

What started this for me was the RockSim I used for that rocket ended up being way off, about 60% off from the actual flight, and that is an anomaly based on the rest of my simulations. My simulations are usually within 15-20% for the first sim then I adjust the sim post flight based on actual numbers and continue to adjust with each flight to where they are reliably within 5-10% depending on the velocity and alt.

Based on this, the obvious difference between this rocket and the rest of the fleet is the bell retainer. However in all fairness I have only launched this rocket once so it is premature to call it. The rocket had an experimental deployment system that I rebuilt last winter to a traditional recovery system, but I have not launched it since, and may not until next spring in order to get some comparable numbers.
 
Last edited:

Onebadhawk

Sponsor
TRF Sponsor
Joined
Jan 11, 2013
Messages
6,057
Reaction score
360
Michael how does that one from the UK work ???
You have to put wood screws into the aft centering ring each time ???

Teddy
 

mpitfield

Moderator
Staff member
TRF Lifetime Supporter
Global Mod
Joined
Jul 7, 2013
Messages
4,900
Reaction score
430
Location
Toronto, Ontario
Michael how does that one from the UK work ???
You have to put wood screws into the aft centering ring each time ???

Teddy
Hey Teddy,

I was wondering the same thing and had the same thought as you. Not as slick as the GLR one, however if it is a removable one then at least it's not permanent if you have issues with it. So it may be a good one to test.
 

Onebadhawk

Sponsor
TRF Sponsor
Joined
Jan 11, 2013
Messages
6,057
Reaction score
360
EEhhhhh,,
Looks like the bell gets in the way of the screwdriver shank....

Teddy
 

JJSR

Well-Known Member
Joined
Dec 12, 2012
Messages
776
Reaction score
65
I have a GLR 38mm one on my up-scale QCC explorer, love the look, as for performance I don't know
Picture or Video 415.jpg
 
Last edited:

RocketFeller

Well-Known Member
Joined
Sep 15, 2009
Messages
1,187
Reaction score
72
I want one!

I have two rocket with the Binder Design bell (one is the Galaxy that they are made for, the other a scratch build) and I like the look lot. I am an anti-performance kind of flyer usually, so I don't mind the extra drag one bit.
 

MikeyDSlagle

Well-Known Member
Joined
Dec 17, 2013
Messages
2,298
Reaction score
276
With the way that cone is made, it would be a PITA using screws all the time. It looks like maybe the base is attached via screws and the cone threads on and off, like the bigger aeropacs. The 24mm is made that way for sure, so I would think surely the larger ones are too.
 

Banzai88

Lvl 1,Wallet....Destroyed
TRF Supporter
Joined
Jul 15, 2015
Messages
2,375
Reaction score
559
Michael how does that one from the UK work ???
You have to put wood screws into the aft centering ring each time ???

Teddy
Hey Teddy,

I was wondering the same thing and had the same thought as you. Not as slick as the GLR one, however if it is a removable one then at least it's not permanent if you have issues with it. So it may be a good one to test.
EEhhhhh,,
Looks like the bell gets in the way of the screwdriver shank....

Teddy
I'm trying to find the pics that I've seen of them, but IIRC, you put threaded inserts into the aft centering ring, and use an L shaped allen wrench on the short side to turn in allen headed screws to hold it on. Not the most user friendly, and why I decided to use the GLR unit.

 
Last edited:

Banzai88

Lvl 1,Wallet....Destroyed
TRF Supporter
Joined
Jul 15, 2015
Messages
2,375
Reaction score
559
What is the white rocket in the second picture?
From the Rowes site: Gary Blinko with his scale Pegasus. The cone will be painted white to match the rest of the model
 

Onebadhawk

Sponsor
TRF Sponsor
Joined
Jan 11, 2013
Messages
6,057
Reaction score
360
I'm trying to find the pics that I've seen of them, but IIRC, you put threaded inserts into the aft centering ring, and use an L shaped allen wrench on the short side to turn in allen headed screws to hold it on. Not the most user friendly, and why I decided to use the GLR unit.

Yeah Tom,, that's what I was seeing,, your pic's are better though,,
but threaded insert or not I still think Giant Leaps is easier by far to get on and off....

Teddy
 

Banzai88

Lvl 1,Wallet....Destroyed
TRF Supporter
Joined
Jul 15, 2015
Messages
2,375
Reaction score
559
.......but threaded insert or not I still think Giant Leaps is easier by far to get on and off....

Teddy
I agree 100%. I like my GLR bell, works well, and I would buy it again.

I briefly considered the Rowes, and solving the pain in the butt fastener alignment with a ball allen driver. After going through some serious Olympic grade anal gymnastics to figure out how to get one over here on the US side of the pond, and for the price point, it was a non-starter. I'm at a point in life where my tolerance for 'work arounds' instead of 'works right' is about nil.
 
Last edited:

Onebadhawk

Sponsor
TRF Sponsor
Joined
Jan 11, 2013
Messages
6,057
Reaction score
360
I agree 100%. I like my GLR bell, works well, and I would buy it again.

I briefly considered the Rowes, and solving the pain in the butt fastener alignment with a ball allen driver. After going through some serious Olympic grade anal gymnastics to figure out how to get one over here on the US side of the pond, and for the price point, it was a non-starter. I'm at a point in life where my tolerance for 'work arounds' instead of 'works right' is about nil.
hahahaha,,
Man I'm with ya there...
No reason most often right..
Just easier to do it right the first time...lol...

Teddy
 

manixFan

Not a rocket scientist
Joined
Feb 15, 2009
Messages
1,908
Reaction score
879
Location
TX
Other than looking nice, I am not seeing any benefit.
The look is the benefit. For some designs the bell would really make the rocket.

Why do folks put decals on their rockets? I don't see the benefit in that so I almost never do. But lots of folks like the looks in spite of the trouble and expense.

To each their own.


Tony
 

Bat-mite

Rocketeer in MD
Joined
Dec 5, 2013
Messages
10,881
Reaction score
1,623
Location
Maryland
The look is the benefit. For some designs the bell would really make the rocket.

Why do folks put decals on their rockets? I don't see the benefit in that so I almost never do. But lots of folks like the looks in spite of the trouble and expense.

To each their own.


Tony
Can't argue with that!
 

Latest posts

Top