I am working on a multi-stage Nike Ajax (Build thread in the mid-power section. It originally started as a TLP upgrade, but since has turned into a complete scratch project.
I am to the point in the project where I have to start integrating the electronics. I am planning on using a staging timer in a nose electronics bay, using a headphone jack as the release, as noted in this thread
I have the wired headphone jacks - so I'm all set on that front, however, I'm starting to question my original idea on the timer.
Based again on the article that I linked above, I had planned to use the Perfectflight Mini Timer 3G - the size is perfect for my electronics bay. Which, BTW, is a ST-11 - so I have a 1.1" diameter space in which I can fit this. It's over 10" long, so I have plenty of space lengthwise, but need to constrain this to the 1.1" diameter.
I was on the verge or purchasing the MT3G, but in reading the manual, I wasn't crazy about the programming method - as it sounds like it programs based on how long you hold down the switch. Since I'm looking to time this pretty close to the burn length of the motors that I'll be using in the booster, I need to be able to precisely program the timer.
While I can stop watch the programming time, I'm not sure my reactions are good enough to be able to let up at a precise 1/10th of a second moment. For example, if the burn time of the booster motor is 2.8 seconds, I want the timer to fire at 2.9 seconds - and I'm afraid that holding down the button is gonig to get me 2.7 seconds 3.3 seconds, etc. No way to fine tune the program.
So I guess I'm looking for suggestions and comments as to how to use the MT3G, or if there's a better one out there on the market that still fits in my 1.1" e-bay.
Thanks for your suggestions!
Paul
I am to the point in the project where I have to start integrating the electronics. I am planning on using a staging timer in a nose electronics bay, using a headphone jack as the release, as noted in this thread
I have the wired headphone jacks - so I'm all set on that front, however, I'm starting to question my original idea on the timer.
Based again on the article that I linked above, I had planned to use the Perfectflight Mini Timer 3G - the size is perfect for my electronics bay. Which, BTW, is a ST-11 - so I have a 1.1" diameter space in which I can fit this. It's over 10" long, so I have plenty of space lengthwise, but need to constrain this to the 1.1" diameter.
I was on the verge or purchasing the MT3G, but in reading the manual, I wasn't crazy about the programming method - as it sounds like it programs based on how long you hold down the switch. Since I'm looking to time this pretty close to the burn length of the motors that I'll be using in the booster, I need to be able to precisely program the timer.
While I can stop watch the programming time, I'm not sure my reactions are good enough to be able to let up at a precise 1/10th of a second moment. For example, if the burn time of the booster motor is 2.8 seconds, I want the timer to fire at 2.9 seconds - and I'm afraid that holding down the button is gonig to get me 2.7 seconds 3.3 seconds, etc. No way to fine tune the program.
So I guess I'm looking for suggestions and comments as to how to use the MT3G, or if there's a better one out there on the market that still fits in my 1.1" e-bay.
Thanks for your suggestions!
Paul