Boosted Stretched Super Big Bertha

I have a Super Big Bertha kit and some BT80 tubes with couplers. I'm trying to decide if I want to stretch the SBB, add a booster or both. I like the look of a stretched SBB but I also want to stage it using LOC interchangable MMTs (4x18mm, 1x24mm, 3x24mm and 1x29mm)

Thoughts?

Black power or electronic staging?

Interchangeable motor mounts for sustainer AND booster or just sustainer only?

3x24 in both booster and sustainer I think puts you into high power over 125 grams

https://www.rocketryforum.com/threads/engine-type-size-chart.39072/

Post 3

1x29mm for sustainer which is the standard with the kit. The interchangable mounts in the booster only. I'm HPR L2 so I could do 3x24mm to 3x24mm but that gets too expansive.

I was thinking direct staging and keeping it without electronics.

My experience is cluster staging is really tough. If one or two don't light, the odds for a pile driver go way up. I would go with 1x29.

Thinking about it... 3x24 in the booster might work, but go with gap staging. Will you be using dual deployment?

I know I am dredging up an old thread but wondering if this project ever happened... I was contemplating doing more or less the same thing... Either a simple Boosted Super Big Bertha or extending the body as well...

I am planning to 3D print a swappable cluster setup for the booster but would probably launch with 2x D12-0 in booster and 1x D12-5 in sustainer. Seems to simulate well enough.



Here it is with an extra BT-80 tube (and an internal tube to try to help with parachute ejection.

It did. I built the sustainer and booster. Built both as 1x29mm direct staging. The sustainer had the mmt recessed to allow for the booster coupler. Rather than stagger the booster fins I trimmed them so they're in line with the sustainer. Flew F16-0 to E18-6. Flew great but booster landed hard and messed up the coupler.

Gonna build another booster with 3x24mm and do 3xE12-0 to E18.

heada said:

It did. I built the sustainer and booster. Built both as 1x29mm direct staging. The sustainer had the mmt recessed to allow for the booster coupler. Rather than stagger the booster fins I trimmed them so they're in line with the sustainer. Flew F16-0 to E18-6. Flew great but booster landed hard and messed up the coupler.

Gonna build another booster with 3x24mm and do 3xE12-0 to E18.

Click to expand...

Very cool -- I do not have big enough fields... 200m is already a bit high for me (I think - I just bought an altimeter so I can see how high my rockets are flying).

Did you consider doing the extended body?

Yeah, I did extend the body of the sustainer by 8 inches. I added the extension and a baffle.

Add an ejection baffle, and you're golden!