Why no airstart? - Northern Colorado Rocketry

This topic has 3 replies, 3 voices, and was last updated 17 years, 5 months ago by MikeS.

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May 5, 2008 at 3:27 pm #40249
new2hpr
Participant
Well, the PF timer in Excess in Moderation failed, though it was my own fault to some degree. When I turned it on at the pad, I only got a single low tone, then nothing. Not recognizing that as a valid state, I should have pulled it off the pad and rechecked everything, but I slacked and let it go.

After the flight, as I was pulling it apart, I unhooked the first (of 3) ematches and powered up the timer and got the correct tones. As I was already late for my pad manager shift, I left the debug for later.

Any ideas? The matches were in parallel in separate screw terminals (breakout board). I haven’t checked continuity on the removed matches yet.

The bummer was dumping the guts of 6 F24s into a baggie, so I could return all the cases I borrowed, then looking at the landing damage knowing that I might not get to fly it again. 🙁

Must learn more patience and thorough checking.

Ken
May 5, 2008 at 4:12 pm #47789
Dreasher
Ken,

Your welcome to use my case again anytime if you try to fly Excess in Moderation again or any other project. Why their was no airstart I don’t know. I had the same PF Mini 3 timer in the 2.5X Big Daddy and both motors light. The second took a second to come up to pressure but they light.

Patience is definitely you have to have as the projects get more complex.

Ron Dreasher
June 5, 2008 at 9:41 pm #47790
MikeS
Moderator
What ignitors were You using? In Big Daddy

And What motors were being air started?

I forget.

I see in the instructions, If you are drawing more than 2 amps
the battery drops off to 0. Using a regular 9V.

I think that may have been the slight time seperation of the
motors firing. ?????

The N6PT can put out up to 20A. Recomended by Perfectflite.

I found one at batteryprice.com for $24.44 including shipping.

I always try to buy with the future in mind.

If anyone can fill Me in. HELP. I know very little of
electrical stuff.
June 6, 2008 at 12:41 pm #47791
MikeS
Moderator
I have also ordered two (6 packs)

Perfectflite suggested using six 2/3 A NiCad cells.
Will light anything out there.

Suggested http://www.batterystore.com
They will make a custom pack soldered with
leads.

There is a minium order of $30.00. Two packs
came to $36.00. + freight

It is a little weight but for Myself it is worth it for
the peace of mind.

I will always have these in my box at a launch.
I will only use them a couple times a year. Any
time anyone need to use, just ask.
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