Jolly Logic 3 vs 2 stage rocket

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NewtonsLaws
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Jolly Logic 3 vs 2 stage rocket

Postby NewtonsLaws » Tue Mar 14, 2017 4:48 pm

Launched a two stage rocket the other day.
Jolly Logic Altimeter 3 did not show the second stage launch.
Any thoughts on why this is?

See below image.
First stage end as 2.32 sec , second stage shows as delay time not thrust time.


Blue fire Maiden
Max altitude 1317 ft
Date 12/03/2017 8:47 AM
Mode Rocket
Duration 1 min 48 secs
Notes
Thrust time 2.35 secs
Max speed 112 mph
Peak accel 10.83 Gs
Avg accel 2.16 Gs
Ejection delay 1.85 secs
Coast-Apogee 7.25 secs
Apogee-Eject -5.40 secs
Ejection altitude 928 ft
Initial descent 15 fps
Landing speed 10 fps


Blue Fire Flight data 12 March 2017.jpg
QRS #184
AMRS #134 L2 RSO / LCO

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SpaceManMat
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Re: Jolly Logic 3 vs 2 stage rocket

Postby SpaceManMat » Tue Mar 14, 2017 5:11 pm

Welcome to the forms NL.

I could not see a mention of staging in the manual.

Two likely reasons are:
1. It does not support it so when it sees the break in acceleration from the booster it simply marks that as burn out.
2. It does support it however the thrust from the sustainer was below the threshold to detect ignition of your second motor.

I would email him and find out the address is: support@jollylogic.com

You may even convince him to provide an upgrade. At the least like you expect it should report burnout of last motor.
QRS: 124
AMRS: 32 L2 RSO
Highest Altitude: 10,849 feet
Largest Motor: CTI 1115J530 IM
Current Project: X Wing

martymonsta
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Re: Jolly Logic 3 vs 2 stage rocket

Postby martymonsta » Tue Mar 14, 2017 9:20 pm

Hi NL and welcome to the forum.

The Jolly Logic Altimeters are more basic then some of the other Altimeters on the market, they are still great little units. Yes, they have both accelerometer and barometer, but there is limited logic (there might be some but not that I've seen) between the two sensors.

So how they work. The accelerometer senses the first acceleration and records this as lift off. It then uses high school physics, time and acceleration, to calculate speed, however, the accelerometer is limited to 25G so on a high G flight, expect both the Max G's and speed to be reduced. When the accelerometer senses the first de-acceleration that is recorded as motor burnout. The second de-acceleration is recorded as separation/ejection charge, however, if the rocket experiences enough drag during the coast phase this can falsely record separation. Apogee is recorded by the baro sensor only.

So they work great for single stage low G flights and are fine for measuring apogee on flights like yours, however, if you want more data on complex flights that you will need an altimeter with more complex logic.
Many years ago the great British explorer George Mallory, who was to die on Mount Everest, was asked why did he want to climb it. He said, "Because it is there."
Well, space is there, and we're going to climb it

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AMRS #41 L2/LCO/RSO/CO

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John Beans
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Re: Jolly Logic 3 vs 2 stage rocket

Postby John Beans » Wed Mar 15, 2017 3:12 am

Yep, AltimeterThree does not (yet) do 2 stage flight analysis. There's no reason it can't, there just hasn't been high demand. It's certainly got the smarts for it, I'd just have to add the logic...
CEO, Jolly Logic

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NewtonsLaws
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Re: Jolly Logic 3 vs 2 stage rocket

Postby NewtonsLaws » Wed Mar 15, 2017 5:02 am

Thank you for all your replies!

And thank you John for your reply!

Great to hear it could get it.
Love the product.
I know that LPR two stages are not a high frequency flight.
But if you could add it to the improvement list please and we could do a firm ware update for the device.
By Easter.... ;-)

Looking forward to the future.
QRS #184
AMRS #134 L2 RSO / LCO

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CATO
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Re: Jolly Logic 3 vs 2 stage rocket

Postby CATO » Wed Mar 15, 2017 5:50 am

John Beans wrote:Yep, AltimeterThree does not (yet) do 2 stage flight analysis. There's no reason it can't, there just hasn't been high demand. It's certainly got the smarts for it, I'd just have to add the logic...



Hi John, welcome to the forum!
"In thrust we trust"

AMRS 21 L3

Impulse:
2017: 5,973 Ns (13.14% M)
Ns 16: 34,558; 15: 35,955; 14: 6,016; 13: 10,208
PB - Gorilla N2717WC, H: 10,260', S: 1.14M

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SpaceManMat
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Re: Jolly Logic 3 vs 2 stage rocket

Postby SpaceManMat » Wed Mar 15, 2017 9:06 am

John Beans wrote:I'd just have to add the logic...


Not just any logic, it must be Jolly Logic of course...
QRS: 124
AMRS: 32 L2 RSO
Highest Altitude: 10,849 feet
Largest Motor: CTI 1115J530 IM
Current Project: X Wing


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