Cookie the Dog's Owner
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I was rooting around at ninfinger.org and came upon the scans of the one and only rocketry products catalog issued by the Bo-Mar Development Company of East Syracuse, New York, a purveyor of varied models of 3FNC rockets based on Centuri ST-7 tubes.
I was particularly taken with this one, the Spartan:
The "parts" page of the catalog lists ST-7 tubes (they don't call them that, but the inner and outer diameters are identical) in 9" and 18" lengths, a hardwood nose cone 3.25" long, and a plastic nose cone 3.5" long. Based on the "family portrait" on the back cover of the catalog...
...it appears that every kit in the lineup was based on the 9" tube except the big fella in the center, the Phoenix. The catalog describes the Phoenix as being 21" long--18" tube plus 3.25" nose cone actually makes it 21.25, but what's a quarter inch among friends? That makes the Spartan 12.25" in length (9 + 3.25). Taking measurements off of the back cover photo, I worked out dimensions for the fins, and came up with a design for a Spartan clone using a BT-20 tube and an off-the-shelf Estes plastic nose cone.
View attachment Bo-Mar Spartan v2 (scaled from illustration).ork
I'd appreciate your comments and critiques.
I was particularly taken with this one, the Spartan:
The "parts" page of the catalog lists ST-7 tubes (they don't call them that, but the inner and outer diameters are identical) in 9" and 18" lengths, a hardwood nose cone 3.25" long, and a plastic nose cone 3.5" long. Based on the "family portrait" on the back cover of the catalog...
...it appears that every kit in the lineup was based on the 9" tube except the big fella in the center, the Phoenix. The catalog describes the Phoenix as being 21" long--18" tube plus 3.25" nose cone actually makes it 21.25, but what's a quarter inch among friends? That makes the Spartan 12.25" in length (9 + 3.25). Taking measurements off of the back cover photo, I worked out dimensions for the fins, and came up with a design for a Spartan clone using a BT-20 tube and an off-the-shelf Estes plastic nose cone.
View attachment Bo-Mar Spartan v2 (scaled from illustration).ork
I'd appreciate your comments and critiques.