Looking for a altimeter that will fit into a 18 - 24mm tube (hopefully for Black Friday)!

[majordude]

The smallest I have seen is Blue Raven which fits into a 18mm tube.

 

[NTP2]

The smallest I have seen is Blue Raven which fits into a 24mm tube.

Would a egg timer work?

 

[majordude]

Would a egg timer work?

Does it fit into a 24mm tube?

 

[terryg]

Eggtimer quark is 1.8″ x .75″
Eggtimer apogee is 1.75” x .9”

 

[NTP2]

Why do you need it so small?

 

[majordude]

Why do you need it so small?

I want to get this back: https://www.mach1rocketry.com/product-page/alien-intercepter-bt20-minimum-diameter

 

[ecargmij]

I want to get this back: https://www.mach1rocketry.com/product-page/alien-intercepter-bt20-minimum-diameter

You would need a gps to get it back.. and eggtimer mini transmitter would work. It will fit in an 18mm tube. The one caveat is you have to solder the kit together

 

[Raythain]

Why do you need it so small?

Measuring LPR. Plenty of flying happens in small rockets.

The smallest I have seen is Blue Raven which fits into a 24mm tube.

Are you looking for deployment, or just data? There’s plenty of options for data logging, and even more for peak altitude only.

Jolly Logics will fit in BT50. Estes altimeter works too, not sure if that is narrow enough for BT20. Altus Metrum and PerfectFlite have small altimeters, and the WSMC uses the Adrel MicroPeak that North Coast carries. There are also some FlightSketch Minis out there, but they’re almost unobtainum.
As far as I know, none of those do deployment though. The challenge of small altimeters is often the ways you get data off is more complex, like the light pulse transfer that Altus Metrum does.


If the goal is recovery, might be worth looking into a keychain screamer on the shock cord. Not sure if any GPS stuff goes that small.

 

[Titan II]

error

 

[ecargmij]

You would need a gps to get it back.. ans eggtimer mini transmitter would work. It will fit in an 18mm tube.

You would need the mini gps transmitter and a receiver.. lcd is what I like so I can see the lat/long.. normally $130 all together.. $110 on sale until monday.. even cheaper if you don't want the lcd..

Check out the TRF post for the sale info and Eggtimers website for more info on them

 

[roytyson]

Your looking for a tracker, not an altimeter right? You said, to get it back, indicating a tracker? Not sure there is much smaller than eggtimer stuff

 

[cwbullet]

The smallest I have seen is Blue Raven which fits into a 18mm tube.

There are plenty of threads on this topic if you "search." There are. a lot of them that fit that mark. Perfectflight Statologger CF and Easy Mini come to mind. RRC3 is close.

 

[NTP2]

I want to get this back: https://www.mach1rocketry.com/product-page/alien-intercepter-bt20-minimum-diameter

I see I second the people saying egg timer GPS mini and you can send it to people to solder it if you aren’t comfortable with it.

 

[NTP2]

Measuring LPR. Plenty of flying happens in small rockets.

I have never seen the point on rockets that don’t go high enough to stop being able to see. But that’s my opinion which is worth 1cent.

 

[majordude]

You would need the mini gps transmitter and a receiver.. lcd is what I like so I can see the lat/long.. normally $130 all together.. $110 on sale until monday.. even cheaper if you don't want the lcd..

Check out the TRF post for the sale info and Eggtimers website for more info on them

I didn't think of that. This might work better than a dual-deploy for this rocket (and others I have).

 

[Titan II]

There are plenty of threads on this topic if you "search." There are. a lot of them that fit that mark. Perfectflight Statologger CF and Easy Mini come to mind. RRC3 is close.

None of those three fit an 18mm tube.

 

[majordude]

I see I second the people saying egg timer GPS mini and you can send it to people to solder it if you aren’t comfortable with it.

The GPS module looks interesting!

 

[ecargmij]

The GPS module looks interesting!

Check out their website for more detailed info.. one thing to note again is its a kit that you need to solder together... or pay someone else to solder..

 

[Titan II]

I have never seen the point on rockets that don’t go high enough to stop being able to see. But that’s my opinion which is worth 1cent.

Did you consider that he may want it to come down to a reasonable altitude before deploying the main so it doesn't float into the next county/state.

 

[majordude]

Did you consider that he may want it to come down to a reasonable altitude before deploying the main so it doesn't float into the next county/state.

LOL. I fly in Lucerne Valley and I've damn near had some rockets land in Phoenix.

 

[terryg]

For dual deploy it is going to have to fit in an 18mm coupler/ebay.

 

[terryg]

https://www.transolve.com

 

[tsmith1315]

LOL. I fly in Lucerne Valley and I've damn near had some rockets land in Phoenix.

The Eggtimer Quark fits a 24mm. For a $20 bill, it's worth a try if you have a soldering iron. The battery and switch take more space than the altimeter.

 

[jhill9693]

I'm very partial to the Eggtimer Quark. Also, they have a Black Friday Special right now.

 

[Spacedog49Krell]

LOL. I fly in Lucerne Valley and I've damn near had some rockets land in Phoenix.

I thought a friend held the record for Lucerne at 12 miles. His rocket landed on the north side of Bear Valley Rd just east of Central Rd.

 

[David_Stack]

https://www.rocketryforum.com/threads/estes-astron-elliptic-ii-dual-deploy-build.46539/
My recollection is that Leo 'rolled his own' altimeter...

 

[Titan II]

For dual deploy it is going to have to fit in an 18mm coupler/ebay.

Not really. The e-bay can be contained in a part of the full width body tube and the charges wired from there. That gives much more room. Here are some coupler dimensions.
Inner Diameter: 0.656" (1.67 cm)
Outer Diameter: 0.700" (1.78 cm)

 

[cerving]

I thought a friend held the record for Lucerne at 12 miles. His rocket landed on the north side of Bear Valley Rd just east of Central Rd.

And I thought my 6 1/2 miles at Jean Dry Lake was bad...

 

[Johnly]

Have you looked at the TeleMini?
https://altusmetrum.org/TeleMini/1.7 x 0.5 inch board designed to fit inside 18mm airframe coupler tube

 

[SolarYellow]

Cheapest dual deploy that fits in BT-20 is a Quark.

The smallest dual deploy I know of is the Adrel DeployMax. Not cheap, but for minimum size/mass, there's nothing else like it.

At Lucerne, you don't really need dual deploy, you just need tracking.

The EF Mini doesn't fit cleanly in BT-20, but fits in BT-20+ available from eRockets or in Quest 20mm tubing. It's straightforward to make an Honest John-style payload bay from either one, or just make the whole airframe out of them. AFAIK, there isn't really a way to get usefully smaller with the current cost-effective GPS receivers.

https://upload.wikimedia.org/wikipedia/commons/d/d8/IRVE-2_launch_on_Black_Brant_IX.jpg

Just FYI, based on the sim work I've done, I am confident I could build a cheap, cardboard rocket that would outperform that Alien Interceptor for apogee by a good bit with the available 18mm commercial motors. It basically comes down to AT D13/D24, which are about six of one/half a dozen of the other once you start adding the weight of the tracking electronics. There is EX and some OOP stuff, but for new production you can buy, that's it.

Once you go to 24mm, there are many, many more options.