Binder Design 3.9" Avionics Bay

Binder Design - Dual Deploy Kit for 3.9" Diameter Rockets {Component}

Contributed by Wayne Miller

Manufacturer: Binder Design

Altimeter bay kit for 3.9inch rockets.


  • 2 coupler tubes
  • 4 bulkheads
  • 2 all-threads
  • 4 wing-nuts
  • 4 washers
  • 4 nuts
  • 1 key switch

Construction PRO's: Instructions were complete and easy to follow, backed up with great illustrations. Construction was easy. Only gotcha is the cutting out of airframe hole for switch to go in. No special tools are needed.

PRO's: This altimeter bay is made different from any other that I've seen on the market. In my opinion, the main pro of this kit is the fact that the key switch allows you to arm your electronics when the rocket is on the pad without having to disassemble anything.

Other Reviews
  • Binder Design 3.9" Avionics Bay By Jon Hatch

    (by Jon Hatch - 06/01/03) Construction: The Parts list is as follows: 4" long section of 3.9" body tube 6" couplers Outer bulkheads to cap the ends of the couplers and slide inside the BT of your rocket Inner bulkheads that just fit inside the tube couplers to help provide a seal 12" lengths of "all-thread" Key switch Eye bolts ...


W.A. (July 12, 2004)
Be careful with the switch. I didn't find them to be very durable. The first one broke, the second melted. The rest of the bay was very good though.

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