Quantcast

Cluster rocket

The Rocketry Forum

Help Support The Rocketry Forum:

apburner

APBurner
Joined
Jun 20, 2013
Messages
270
Reaction score
1
Built this one a couple of years ago. I've only flown it on a central CTI G65. Flew great. But looking forward to burning a full load of BP in it in dayton this weekend. With a D12-7 and 7 C6-0's it will be 1.5 newton seconds shy of a G and an average thrust of 78. Should be a fantastic flight with lots of smoke and fire. 8 motor cluster.png
 

Attachments

soopirV

Well-Known Member
Joined
Sep 1, 2010
Messages
1,157
Reaction score
6
Built this one a couple of years ago. I've only flown it on a central CTI G65. Flew great. But looking forward to burning a full load of BP in it in dayton this weekend. With a D12-7 and 7 C6-0's it will be 1.5 newton seconds shy of a G and an average thrust of 78. Should be a fantastic flight with lots of smoke and fire. View attachment 319627
As one who has not attempted many clusters (I've got 2 or 3 LPR birds that are built for it, but sadly remain unflown), how do you ignite that many motors? Are you successful with a clip whip or do you plan to try the more-flashy "flash in the pan" (pun intended)?
 

AfterBurners

Well-Known Member
Joined
May 8, 2012
Messages
7,748
Reaction score
425
Location
Somewhere on the planet
As one who has not attempted many clusters (I've got 2 or 3 LPR birds that are built for it, but sadly remain unflown), how do you ignite that many motors? Are you successful with a clip whip or do you plan to try the more-flashy "flash in the pan" (pun intended)?
what you need to say if you have 3 engine cluster you just divide the wires and tie them together. You take one wire from each motor and you twist the wires together. You do the same for the remaining wires. So now you have two groups of wires to attach the alligator clips. Make sure you have a good connection with the clips or else they won't ignite.
 

rstaff3

Oddroc-eteer
Joined
Jan 18, 2009
Messages
11,759
Reaction score
14
I know of a guy who lit 7 motors using Estes (now the old style) by taking scrap wire and extending each lead. It was all twisted together and the joints were taped. I personally have never done over three motors without the old Q2G2s or quickmatch. The launch system makes a difference. A relay launcher with the battery at the pad makes a big difference.

Here is a good reference https://www.narhams.org/library/tech/006-Clustering.pdf
 

Trident

Retired, plenty of kits
Joined
Jan 18, 2009
Messages
861
Reaction score
9
Back in the 90s there was a rocket at a HPR launch that flew on a cluster of 60+ D12 motors. I don't recall the exact number,, but it was a spectacular display of fire. I'm pretty sure all motors had Thermalite fuse, which was great for clusters and airstarts. I'm trying to find video.
 

rstaff3

Oddroc-eteer
Joined
Jan 18, 2009
Messages
11,759
Reaction score
14
I have seen several large clusters like that. Would have to research them now. Boris is our current cluster guru.
 

TRFfan

Well-Known Member
Joined
Aug 5, 2015
Messages
1,211
Reaction score
2
What about 1 G150 and 6 D21's? Can you say shred? :lol:
 

RocketflierVB

Well-Known Member
Joined
Jan 19, 2009
Messages
122
Reaction score
18
At LDRS in 2003 he flew the Maxi-D. Came out to be an M motor. 1330 or a 3330, can't remember...

LDRS 22 303 D motor cluster.jpg
 
Last edited:

apburner

APBurner
Joined
Jun 20, 2013
Messages
270
Reaction score
1
I am going to go old school and flash pan. I have clustered a central 18 and 7 13's several; time without a single misfire of any-kind
 

RocketflierVB

Well-Known Member
Joined
Jan 19, 2009
Messages
122
Reaction score
18
Medusa Painted.jpgView attachment 319800

Here is another interesting design...pulled from the internet...Andrew from Voodoo Rocketry

[video=youtube;S6acoiFkFG8]https://www.youtube.com/watch?v=S6acoiFkFG8[/video]
 
Last edited:

rharshberger

Well-Known Member
Joined
Oct 13, 2014
Messages
9,794
Reaction score
1,765
Location
Pasco, WA
Top