Timer Staging Discussion

[boatgeek]

1.16 deaths per 100 million vehicle miles traveled. Don't know to convert exposures.

Perhaps think of a flight like a trip in a car? Average car trip is ~9.4 miles, so that's around 1.1 deaths per 10 million trips.

 

[BLH]

A wise man once told me, "Convince a person against their will, and they will fight you still."

 

[gldknght]

They must have used a simple timer on this project. I bet a timer with tilt inhibits would have prevented this.

 

[Cameron Anderson]

That is correct. However, lockouts can prevent an ignition due to a non-optimal condition, while a straight timer can not.

Fully concur.

I'm somewhat familiar with your line but not as much as I'd like (I solder like a caveman), do any egg products have tilt inhibits, altitude lock outs, or spin/yaw detection? Im always looking for new ways to stage.

 

[cerving]

Fully concur.

I'm somewhat familiar with your line but not as much as I'd like (I solder like a caveman), do any egg products have tilt inhibits, altitude lock outs, or spin/yaw detection? Im always looking for new ways to stage.

In the spirit of this thread I'm keeping it vendor-agnostic... please email me at [email protected] if you have specific questions about our product line.

 

[rfjustin]

You sir are a leming.

How did you know that Chuck was a lemming!? Damn it, the game is up!

Good work on this thread, said no one ever.

 

[pondman]

How did you know that Chuck was a lemming!? Damn it, the game is up!

I always suspected that Chuck was a lemming; just did not want to let the cat (err lemming...) out of the bag.

 

[a3isdell]

after reading all 337 post, I have one question what would be the recommended electronics for staging?

 

[tim cubbedge]

after reading all 337 post, I have one question what would be the recommended electronics for staging?

Marsa33, Raven 4 probably most trusted.

 

[boatgeek]

after reading all 337 post, I have one question what would be the recommended electronics for staging?

Eggtime Proton has a tilt function but is new so there aren't too many people using them yet. That's what will be in my 2-stage that flies in May.

 

[mikec]

after reading all 337 post, I have one question what would be the recommended electronics for staging?

The least expensive option I know of that can do altitude lockout for staging is the Missileworks RRC3.

Raven and MARSA (without the tilt gadget) can do various types of altitude and velocity lockout. As can Eggtimer Proton.

MARSA with tilt gadget and Altus Metrum Telemega can do full tilt-based lockout. The MARSA is pretty new, I don't have any flight experience with mine yet.

The Proton is an interesting case, it can do some kind of barometric/accel based lockout which is somewhere between actual tilt sensing and simpler lockout schemes.

 

[boatgeek]

Also, Eggtimer Quantum can do altitude/velocity lockouts.

 

[AndrewW]

I use Eggtimer Quantums in my two stage rockets for sustainer ignition primarily because of the ability to arm them remotely. I have two sleds set up, one for 54mm with 2 Quantums and another for 38mm with a single Quantum and a Raven 3.

Although it takes a little work to figure out the altitude and velocity set points I can say that they do work. I have had two off nominal flights, both booster motor CATOs, that if the sustainer would have lit would have been quite scary. In both cases the lockouts prevented sustainer ignition. A tilt sensor would be a nice feature to have but with an accurate sim I find the alt/vel lockouts can be just as secure and I would never personally fly a two stage without using them.

 

[AndrewW]

Still frame from a camera on the sustainer, I definitely did not want the sustainer to light at this point.

 

[boatgeek]

View attachment 374520

Still frame from a camera on the sustainer, I definitely did not want the sustainer to light at this point.

Yikes! Do you know if the curve in the body tube is real or an artifact of a fisheye lens?

 

[AndrewW]

Yikes! Do you know if the curve in the body tube is real or an artifact of a fisheye lens?

It is just an artifact of the wide angle lens.

 

[AndrewW]

Here are a few more shots just for fun.

 

[Nytrunner]

Yikes! Do you know if the curve in the body tube is real or an artifact of a fisheye lens?

What? Your rockets don't banana in flight? Time to start flying on the edge Boat!

 

[boatgeek]

What? Your rockets don't banana in flight? Time to start flying on the edge Boat!

You'll note I allowed for the possibility of a banana, as if I had seen one before.

 

[Dudeman247.]

Just finished this thread and it was off the hook! Had some good laughs and learned a few things.

 

[blackjack2564]

yes , it's one of the great ones worthy of a read.

 

[Ez2cDave]

Maybe we could just add one of those magic RED buttons to multi-stage flights that totally explodes the rocket if things get wonky!! That's how NASA gets around the 14 hard testing steps outlined above. And it would be cool!

But I like the self destruct button! [emoji3]

Now, the only obstacle is getting the "government" to allow the use of C4 in HPR rockets, as a "Safety Feature" . . .

Dave F.

 

[BABAR]

Now, the only obstacle is getting the "government" to allow the use of C4 in HPR rockets, as a "Safety Feature" . . .

Dave F.

But kind of makes ground testing in the backyard inconvenient if not inadvisable.