5 x 29mm Cluster

[AndrewW]

I am interested in scratch building something that would allow me to experiment with clustering and air starts. I was originally looking at building something with a 5.5" BT and a 54mm core with four 29mms but was wondering if anyone has done a 5 x 29mm configuration in a 4" Air frame. It looks like it works in OR but appears to be very tight and I wanted to see if anyone has actually pulled it off.

 

[viciouspeanut]

The LOC Ultimate is a 7x29mm in a 4" air frame so x5 shouldn't be a problem.

 

[AndrewW]

I have never seen the Ultimate before is it still in production?

 

[Bat-mite]

Retention is the key. Make sure there is room for however you are going to hold the motors in.

 

[AndrewW]

I was thinking about some studs between the motors with a nut and washer for retention

 

[tomsteve]

the THOY nighthawk was 7-29mm in a 4" airframe. an awesome flier on everything from a single G125 on up to..................................

US rockets has the pillar of fire thats 7-29mm in a 4" airframe,too.
https://v-serv.com/usr/kits/pillaroffire29.htm

 

[AndrewW]

So it looks like I should have no problem with a 5 x29mm pattern. My real goal is play with air starting. I would like to leave the pad with a CTI 29-6XL in the center and then air start the outer motors in two stages a few second apart.

 

[tomsteve]

the good thing with most odd numbered clusters is they can be configured to be able to launch on any amountnof motors. the nighthwak i had, i could launch with anything from 1-7 motors at once.
never did get around to airstarting, but working on a scratch built nighthawk and setting it up to try it

 

[Tonimus]

I approve of this endeavor.

 

[MClark]

LOC used to, and still may, put together an out of production kit.
If you scratch build use plenty of fin area, clusters can get really tail heavy.

M

 

[pyrobob]

the good thing with most odd numbered clusters is they can be configured to be able to launch on any amountnof motors. the nighthwak i had, i could launch with anything from 1-7 motors at once.
never did get around to airstarting, but working on a scratch built nighthawk and setting it up to try it

Good point. Any configuration that allows for any number of motors - limited only by the number of motor mounts - is a plus. The Nighthawk is a great example and really cool looking one at that.

 

[pyrobob]

I approve of this endeavor.

:horse:

 

[dhbarr]

Have we seen 1x 29 + 7x 24 in a 3in? Should be just barely possible using the CTI tapered closure to retain 7x g65, say.

 

[Tonimus]

One of my most difficult decisions was picking between a 75mm mount with twelve 29mm mounts or a 98mm mount and six 29mm. I had to remind myself how expensive 1x75mm and 6x29mm can be...

 

[Rocketjunkie]

98 & 8 54mm...

 

[Tonimus]

Mmmm... More=Better

 

[pyrobob]

View attachment 327183
98 & 8 54mm...

Totally awesome!