# Altimeters: Comparison guide

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#### cerving

##### Owner, Eggtimer Rocketry
TRF Supporter
FYI, I updated altimeter comparison guide (added several new altimeters, removed altimeters that are no longer available, updated prices, etc).

Am I missing new altimeters? Let me know!

-Alex
Alex: The current models of the Eggtimer Quark and Eggtimer TRS are now good to 60,000'. The 30,000' spec was the older Bosch-based models, which haven't been shipped for over two years. Thanks!

#### Andrew_ASC

##### UTC SEDS 2017 3rd/ SEDS 2018 1st
Am I missing new altimeters? Let me know!

-Alex
Telemini V3. It has a RDF radio beacon capability, dual deploy Apogee/main, live telemetry, and programmable channels.

The big change from V1 to V3 is the radio beacon is 40mW instead of 10mW.

##### Well-Known Member
2014 was a great year for electronics in rocketry - we've seen many new devices which are getting smarter, smaller and cheaper. With all the changes, it gets harder to keep track of all available options (don't get me wrong - it's a good problem to have!).

My attempt to simplify it resulted in an extensive list of all currently available model rocket altimeters and their parameters, such as dimensions, weight, sensors being used, interfaces, pyro options, battery and voltage requirements, etc. All data was compiled from vendor datasheets and manuals. If it's something TRF community finds useful, I'd keep maintaining it.

Link: Model rocket altimeters: Comparison guide.

Now here's how you could help: I'm missing some data for few altimeters (look for question marks), mostly related to dimensions and recording functions. If you have one, measure it / post a file with a recorded flight, and I'll update the guide accordingly.

All comments (except negative ones) are welcome!

--Alex
https://RocketsEtc.com/
Useful. I can't fit my Jolly Logic in an 18mm rocket. Nice to know which ones will fit.

#### shockie

##### High Plains Drifter
Does anybody make an altimeter that
1. fits in a bt-20
2. uses some method like perhaps an accelerometer such that I can fire an igniter at 1st stage burnout?
3. or en electronic staging timer ?

#### alexzogh

Does anybody make an altimeter that
1. fits in a bt-20
2. uses some method like perhaps an accelerometer such that I can fire an igniter at 1st stage burnout?
3. or en electronic staging timer ?
The Perfectflite microtimer2 will fit in a bt-20 and provide a single timer for an airstart, or deployment event. https://www.perfectflite.com/ut2a.html

plenty of altimeters that fit in a bt-20 (estes,jollylogic, etc...) although the only one I know that can handle events is the telemini. If you go up to 24mm, there are several like the stratologger, Raven4, RCC3, etc...

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#### shockie

##### High Plains Drifter
I found one flightsketch that I like ....

#### Nateairman

##### Member
I found one flightsketch that I like ....
I have emailed flightsketch a few times hoping to get a dual deploy computer to try out. Which model are you using?

#### Ez2cDave

##### Well-Known Member
How about an update for all currently available altimeters ? This thread started 7 years ago.

Dave F.

#### k3td

##### Well-Known Member
TRF Supporter
Great idea Dave! I'm getting back to flying after a 15 year absence and would appreciate feedback on avionics I should consider for use with dual deployment and a TenderDescender L2 in a 4" rocket - kit still TBD. I want something that has GPS functionality as well. Thank you!

#### Mike Haberer

##### DaHabes
TRF Supporter
Great idea Dave! I'm getting back to flying after a 15 year absence and would appreciate feedback on avionics I should consider for use with dual deployment and a TenderDescender L2 in a 4" rocket - kit still TBD. I want something that has GPS functionality as well. Thank you!
Give me a few days. I have most of the data, just need to validate it....

#### k3td

##### Well-Known Member
TRF Supporter
I'm getting back to flying after a 15 year absence and would appreciate feedback on avionics I should consider for use with dual deployment and a TenderDescender L2 in a 4" rocket - kit still TBD but will build it to work with a range of 38 and 54 mm motors. I want something that has GPS functionality as well. Thank you!

#### rharshberger

##### Well-Known Member
I'm getting back to flying after a 15 year absence and would appreciate feedback on avionics I should consider for use with dual deployment and a TenderDescender L2 in a 4" rocket - kit still TBD but will build it to work with a range of 38 and 54 mm motors. I want something that has GPS functionality as well. Thank you!
If you can solder small components Eggtimer Rocketry offers the Eggtimer TRS, a GPS and dual deploy altimeter all in one, the receiver is also a kit, most cost effective GPS and altimeter I know of.

#### Mike Haberer

##### DaHabes
TRF Supporter
If you can solder small components Eggtimer Rocketry offers the Eggtimer TRS, a GPS and dual deploy altimeter all in one, the receiver is also a kit, most cost effective GPS and altimeter I know of.
The only other combo I know of is a TeleMega (altusmetrum.org). The altimeter/tracker is $400 and the ground station another$100.

#### Mike Haberer

##### DaHabes
TRF Supporter
Updated altimeter spreadsheet. Non-bolded, italic are altimeters that are OOP, as far as I can tell. It's likely not perfect, corrections welcome....

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#### k3td

##### Well-Known Member
TRF Supporter
Awesome - THANK YOU Mike!

#### Jim Hinton

##### Well-Known Member
TRF Supporter
Updated altimeter spreadsheet. Non-bolded, italic are altimeters that are OOP, as far as I can tell. It's likely not perfect, corrections welcome....
Just a comment from outside of the thread. The spreadsheet is really well done. Thank you, Mike!

Jim

#### BEC

##### Well-Known Member
Mike,

Just off the top of my head:

Where are the FlightSketch devices?

Altus Metrum MicroSplash is just a MicroPeak with different firmware (primarily if not entirely a lower altitude launch detect threshold)....so all the info about it should match MicroPeak save that triggering altitude (and the price).

Adrel Max-Alt is just the current version of the ALT-BMP as sold by North Coast Rocketry rather than direct from Adrel in Poland, so again, numbers and capabilities and such should pretty much match. What NCR brought to the table was a Win10 (vs. XP or 7) interface app as well as the USB interface hardware that uses the much-better-supported FTDI USB to serial chip. Also, the weight shown does not include the required lithium polymer cell to power it (which also impacts the dimensions as the cell NCR sells is wider than the device itself).

Eggtimer Apogee is like all the other Eggtimer devices in that it is a kit, so it should also be flagged "DIY"

Someone else will have to take a look at the deployment devices.....which reminds me there is now an Adrel MaxDeploy which is a MaxAlt with a single deployment channel.

Do you have the data that were under the cells where the entry is "Click!" or do you want to put the details that were in there in more columns in the updated spreadsheet? (Since I opened it with Numbers rather than Excel, apologies if that is a data translation issue on my end).

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