Baby Bertha Cluster (was Big Bertha Cluster)
 

What the title says. I'm considering building a Big Bertha as a dual 18mm cluster. I haven't built a cluster in 25 years, and I think I only flew the first one once. I'm thinking about putting a Sunward mount into an otherwise stock Big Bertha.

... or a Baby Bertha. I might never see it again, though ...

Nah, that should work fine. If you go with a three x18mm cluster you'll have a Ranger.
Sort of. ;)

Or you could go nuts and build the "Dolly" (don't ask... LOL) As shown here from an old Pearl River convention


Here's a picture of the tail end of Dolly Bertha

ahhh, to be young, foolish and still have hair... LOL

I'm thinking strongly about a two-engine cluster in a Baby Bertha. Sunward makes nice engine mounts, but buying just one and paying shipping and handling doesn't make much sense. Outside of Estes and Quest kits, I can't get much in the local area... certainly not parts. JonRocket carries the Sunward parts but does not carry Estes rockets... gah.

So I guess I need to figure out a few more things that I need from JonRocket. That will hold up my build for a while.

Or I could roll my own cluster engine mount...

FlisKits also sale’s Cluster Motor Engine-Mounts as will as Canted Cluster Motor Mounts, see EMK2-CL002 motor mount for a BT-60 body tube.


http://www.fliskits.com/products/01prod_fs.htm

Yeah, I see that.

If I could just find someone who would sell me a Baby Bertha and a BT-60 cluster engine mount in the same order...

I'll probably buy the kit at Hobby Lobby, actually. Love those 40% off coupons. Which probably means I'll roll my own cluster engine mount, since I can't buy them locally and I can't justify $6.00 in shipping/handling for a $4.00 part.

Cut your own. They don't have to be perfect. They just have to fit.

I suppose. Anybody have a pattern?

... yes, I'm lazy.

How about an engine mount program?

Click below and look for "Engine Mount/Bulkhead Template Generator". It's free.

http://www.rocketreviews.com/tools.shtml

Excellent, thanks!