The battery is for deploy. I don't think the parrot is rated to fire pyros. I don't have the spare change for a tracker, and sims "only" take it to 7000' on a CTI 6XL little-I. I thought about a second LiPo battery, which would have been a lot sleeker, but then I'd have to get another charger, etc.
The Parrot's on-board battery is for powering the altimeter only. It does require a second battery for pyro.
I still need to get a LiPo for use in mine -- I don't want the bulk or weight of a 9V, although you have given me some ideas for how to carry one, if I need to.
The Parrot's on-board battery is for powering the altimeter only.I still need to get a LiPo for use in mine --
Yes the LiPo battry helps a lot when trying to fit everything.
https://web.mac.com/tennisace1/Site/Rockets.html#29
Which battery are you using, and where did you get it from? Looks like you've got one without the protective circuit; how are you charging it?
-Kevin
I got it form Adrian, and he even removed the protective circuit for me. Just give him an email ([email protected])
This is an emial from Adrian
::Note that for this cell to work for ejection charges, you have to remove the little cell protection circuit from the battery terminals. The cell protection circuitry's current limit is too low, and unnecessary for safety during deployments, but it also protects for overcharge, which is an important consideration. I leave the protection circuit on the Parrots so that if the Parrot's battery charger fails and tries to overcharge the battery, nothing bad will happen. I haven't seen a battery charger fail yet, but there's always a first time. If you go this route, you can charge both cells together using the Parrot's on-board charger by putting a wire from the arm screw switch to the Parrot's power screw switch while the deployment cell is connected. Just remember to remove the wire before flight so that the deployment charge doesn't drag down the main voltage and cause a brownout.::
Also read this
https://myforum.featherweightaltimeters.com/user/Discussion.aspx?id=128238
Use with out the protection circuit at your own risk....
I have a tower launcher question ... How long dose a tower launcher need to be for a 41 inch long rocket ?
Nice work rockie. Where did you find the aluminum coupler ?
Its a motor casing i dont use anymore, a Rousetech/MM 29/120 casing to be exact.
Probably a bit heavy, but a good looking option!
The only thing i am still a bit confused about is what i should use for shearpins ? What do you guys use ?
Very nice looking rocket, Rockie! Love the paint job.
Thanks, how many do you think i should use on one section ? I guess it can be calculated somehow..
The only thing i am still a bit confused about is what i should use for shearpins ? What do you guys use ?
For 38mm and smaller, I don't use shear pins. I did some experimenting with 2-56 nylon shear pins on some 38mm birds and wasn't happy with how much powder was required to break them. There's just not that much area working for you in those sizes, so I use friction fit tuned with masking tape, and make sure my sections have small vents for pressure relief.
Adrian, I would be interested in your experience here as you have built more minimum diameter rockets than I have, but a 38mm x 12" payload and 40 lbs of force (or so) to shear a 2-56 pin requires only 0.25g of BP. To achieve margin in my larger rockets I will up the calculated number by a third and close to double it for 2.1" airframes or below, but still only 0.5g or so?
...The switch is a "Lever Microswitch" rated 3A 125v. I removed the lever and made some custom parts from a small brass tube and a thin plate from an old tobacco box I glued the tube to the (bent)plate and screwed it to the switch becouse gluing it onto the switch is risking the button getting glued aswell. Now i can unscrew and replace the switch if needed. Sprayed it with the tamaiya red for nice color.The pin is actually a old multimeter testprobe i cut in pieces and attached a "remove before flight" flag that can be bought at varius rocketshops...
Shear pins are great for 54mm and up, but for little birds like 29mm, I think it's a lot better to scale up Estes-style techniques up than to try to apply the techniques for a 4" bird down to these small sizes.
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