Accu-Fire Staging Timer

Public Missiles Ltd. Accu-Fire staging timer. This was made for PML by G-Wiz Partners and is no longer available.

I need one for the PML “Terrier” booster kit as my investigation of other types and brands of staging timers leads me to believe they won’t fit in the electronics bay of the “Terrier” once a battery and holder is included.

Any one know why these are no longer made?

I find it hard to believe that a Perfectflite miniTimer 4 wouldn't fit. https://www.perfectflite.com/timers.html
I couldn't find a good drawing of the interstage on the PML website, though.

It might fit, but the problem is the AV bay is made to pit a specific size circuit board.

cwbullet said:

It might fit, but the problem is the AV bay is made to pit a specific size circuit board.

Click to expand...

I think we're talking about slight tweaks to the mounting holes, which seems easier than trying to source an OOP board.
From the PML docs,

The Fore and Aft Timer Mounts used in the Inter-Stage-3000 system are designed around
the Transolve ST-2b or compatible timer. Other units may work as well with slight
modifications to the mounts. Modifications may require relocating the mounting holes and
grinding away material for clearances. Be careful not to weaken the mounts.

Click to expand...

That said, I've never built the Terrier so I don't know how hard this would be.

From my reading of the “Terrier” instructions available online, trying to fit a different timer wouldn’t be as easy as it first appears. Part of the problem is the Accu-Fire board had its own onboard battery connection. None of the other staging timers, I have investigated, have such so now you have to kludge something together that can mount the non-compatible staging timer as well as the battery and its holder/connector.

boomtube said:

Part of the problem is the Accu-Fire board had its own onboard battery connection. None of the other staging timers, I have investigated, have such so now you have to kludge something together...

Click to expand...

Almost no electronics on the market today have integral battery connections, so this is a pretty common problem and not all that hard to deal with (9V battery and a commercial battery holder or clip and some wire and a battery tiedown of some sort.) That said, if you can find an Accu-fire that's probably the easiest solution.

I have been looking through my stuff and found one I'll prolly never use. You still need it? Don't know what fair market value is but I'm sure we can figure something out.

Yes I want it; sent you a PM.

Does anyone here have a copy of the ACCU-FIRE they can post?

cwbullet said:

Any one know why these are no longer made?

Click to expand...

Because G-whiz is bankrupt...out of biz....finite!

I use the Missile Works RRC3 in my Terrier booster. Handles the ignition as well as the deployment charge. Simply cut a piece of G10 to the correct size and you can fit anything (within reason) you want in there.



I just noticed this thread is 5 years old, never mind.

If you use a Pefectflite Minitimer You can fire them with 6 - 357 silver oxide batteries. The fit in a "N' battery holder, very compact. You slide the batteries in a piece of shrink tubing and pops in like a single unit. I wrap electrical tape around the holder to keep the battery unit in place.
See the battery holder below.

Thanks. I will use the RRC3. My post was 4 years old.