Smallest DD Altimeter: BT55 Coupler

gary7 · Aug 9, 2014

Recommendations please for the smallest DD altimeter that will fit inside a BT 55 coupler. Don't need anything fancy, just something reliable to get dual deploy in a very small rocket. I am aware a battery could be a problem so an altimeter with other than the standard 9 volt power source is fine.

Thanks

blackbrandt · Aug 9, 2014

RRC3 is the width of a quarter. Adept 22 can fit in a BT50.

markjos · Aug 10, 2014

Gary,

The simple Missileworks RRC2+ or Altus Metrum EasyMini might be interesting choices. I've got an RRC2+ that you can try - very inexpensive, and simple deployment option.

I think that small LiPo or LiFe batteries would be options for both.

https://www.missileworks.com/rrc2
https://altusmetrum.org/EasyMini/

[You missed our "rocketry electronics" themed meeting last week. I had lots of goodies there.]

Mark

keithp · Aug 12, 2014

From what I can tell, BT-55 tubing is about 1.225 inches inside? That big enough for EasyMini (0.8" wide) or even TeleMetrum (1.0" wide), if you want GPS tracking and telemetry

For small airframes like this, we have little 160mAh LiPo cells.

ksaves2 · Aug 12, 2014

Smallest I know but a little difficult to setup is the Pico AD4. I don't know if Robert DeHate is still making them. It fits in a BT5 so it might be overkill for
some purposes. https://www.picoalt.com/

It's small enough to do a DD in a modroc. Kurt

cerving · Aug 12, 2014

Just about any DD controller will fit into a BT55. I have a MD 29mm made out of BT55 with a coupler running all the way through it for strength; a 29mm motor mount fits perfectly inside a BT55 coupler. It's a lot of fun on a G80. I used an Eggtimer, of course, with a 150 mAh LiPo.

Smallest DD Altimeter: BT55 Coupler

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Smallest DD Altimeter: BT55 Coupler

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