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 ...

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NAR # 115523
Once upon a better day... SAM #0076
My site: http://rocketry.gonnerman.org

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

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Bill Eichelberger
NAR 79563

http://wallyum.blogspot.com/

I miss being SAM 0058

Build floor: Centuri Mini Dactyl Estes - Low Boom SST Semroc - Marauder, Shrike, SST Shuttle

In paint: Canaroc Starfighter Scorpion Estes F-22 Air Superiority Fighter, Multi-Roc, Solar Sailer II, Xarconian Cruiser Semroc Cyber III

Ready to fly: Estes - Solar Sailer II Semroc - Earmark, Groonie Der V 1/2

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

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FlisKits, Inc.
http://fliskits.com/
Model rocket kits and MORE!

Toad's Tavern - http://toadstavern.com/
Personal site - http://jflis.com/

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...

__________________
NAR # 115523
Once upon a better day... SAM #0076
My site: http://rocketry.gonnerman.org

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.

__________________
NAR # 115523
Once upon a better day... SAM #0076
My site: http://rocketry.gonnerman.org

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

__________________
Bill Eichelberger
NAR 79563

http://wallyum.blogspot.com/

I miss being SAM 0058

Build floor: Centuri Mini Dactyl Estes - Low Boom SST Semroc - Marauder, Shrike, SST Shuttle

In paint: Canaroc Starfighter Scorpion Estes F-22 Air Superiority Fighter, Multi-Roc, Solar Sailer II, Xarconian Cruiser Semroc Cyber III

Ready to fly: Estes - Solar Sailer II Semroc - Earmark, Groonie Der V 1/2

I suppose. Anybody have a pattern?

... yes, I'm lazy.

__________________
NAR # 115523
Once upon a better day... SAM #0076
My site: http://rocketry.gonnerman.org

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!

__________________
NAR # 115523
Once upon a better day... SAM #0076
My site: http://rocketry.gonnerman.org