Jolly Logic's AltimeterTwo (A2)

Jolly Logic's web site

Bought from Apogee Components on 3/1/2012

User's Guide

Updated 11/27/2012 - Launches!

Description:

A rechargeable digital altimeter (for model rockets only) that analyzes flight altitude, acceleration, top speed, flight duration and 6 other important flight statistics. The AltimeterTwo retains the rugged design, easily-readable LCD, small size, and rechargeability of the AltimeterOne. With the addition of a 3-axis accelerometer and a 4X speed increase in processing speed, it can provide a full suite of important flight statistics that can help you analyze and improve your rocket’s performance.

Features:

3-axis, 24g accelerometer can detect launch, acceleration, speed, ejection, and landing
Accurate 19-bit barometric pressure sensor sensitive to altitude changes of less than one foot
Daylight-readable LCD display clearly displays all flight statistics-no computer needed
Rechargeable Lithium Polymer battery lasts for hundreds of launches, no batteries to buy
Recharges in less than 2 hours from any standard USB port, no cable necessary!
Samples pressure over 30 times/second, and acceleration over 244 times/second
Power button turns device ON/OFF and RESETs the display between flights
Automatically powers down to conserve power
Handy tether point allows secure attachment, or independent streamer recovery
Rugged fiberglass and ABS construction to survive crashes

Specs:

Size (inches): 0.47 x 0.64 x 1.93
Weight: 0.24 ounces

AltimeterTwo Flight Stages:

Added Interlocking Brass Swivel:

Prepped For Flight:

Launches:

Notes:

"Weight" is build weight of rocket alone. Add to this: 1.0 oz for B engine, .1 oz for 18" nylon chute, .24 oz for AltimeterTwo

1 G = 32.174 Feet / Second²

Big Bertha and BT-50 payload section have 3 - 1/16 inch holes ~ 2 inches from the top of each

All 'Time's are in seconds

Rocket/ Video-Link	Weight (Oz)	Engine	Peak Altitude (Ft)	Top Speed (MPH)	Burn Time	Peak Accel. (Gs)	Avg Accel. (Gs)	Coast to Apogee Time	Apogee to Ejection Time	Ejection Altitude (Ft)	Descent Speed (MPH)	Flight Duration	Notes
3/4/2012 West Haven Park --- Sunny: 55* F --- Winds: 10 - 20 MPH!
Big Bertha	3.5	B6-4	96	45	.7	7.0	3.1	1.9	1.9	57	12	7.0	The chute barely opened!
Big Bertha	3.5	C6-5	310	75	2.1	6.9	1.6	2.1	2.5	257	"- - - -"	.0	Weathercocked quite a bit. Very late ejection. Found A2 powered off?
Big Bertha	3.5	C6-3	264	73	1.8	7.7	1.9	2.2	-0.1	229	9	20.9	Aimed and weather-cocked into wind quite a bit. 45*?
5/13/2012 West Haven Park --- Sunny: 55 - 60* F --- Winds: 0 - 5 MPH!
JX-1	72 g w engine	C6-5	713	147	2.1	13.2	3.2	4.3	-0.2	698	8	60.2	BT-50 payload section w A2
Big Bertha	131 g w engine	C6-5	255	66	2.1	5.9	1.4	2.6	1.7	220	10	21.6	Angled too far into wind. Bent rod
Red Star	80 g w engine	C6-5	540	111	2.2	9.5	2.3	5.2	---	516	7	55.8	No holes in tube
Estes Starlab		B6-4											No altimeter
11/23/2012 West Haven Park --- Sunny: 45 - 50* F --- Winds: 0 - 5 MPH! --- Altimeter acidentally got set to metric?!
Big Bertha	3.5	D12-5	928 (283 M)	168 (271 KPH)	1.8	11.4	4.4	5.9	-0.2	905 (276 M)	14	73.8	Early ejection allowed rocket to "pivot" up, and over the chute, gently - pretty cool looking!
4/4/2014 Bus Park in Farmington --- Partly cloudy: 50* F --- Winds: 10 MPH!
QCC Explorer	5.0 no engine	D12-3	542	109	1.8	9.5	2.8	3.6	-0.2	515	11	35.0	Launched straight up. 18" chute.
QCC Explorer	5.0 no engine	E9-4	1140	171	2.9	7.8	2.7	4.8	-0.1	1096	11	71.4	Launched straight up. Right after the previous D12-3 launch.
Rocket/ Video-Link	Weight (Oz)	Engine	Peak Altitude (Ft)	Top Speed (MPH)	Burn Time	Peak Accel. (Gs)	Avg Accel. (Gs)	Coast to Apogee Time	Apogee to Ejection Time	Ejection Altitude (Ft)	Descent Speed (MPH)	Flight Duration	Notes

Updated April 4, 2014

Huxley@xmission.com