#11
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<thread drift>
Quote:
David, That's almost right....they also don't have an ejection charge as tbzep noted. So just propellant (black powder) and nothing else. When the propellant's upper wall burns through there is often quite a bit of gas released....and in some cases it's enough to eject a recovery system. This, however, is NOT recommended practice. </thread drift>
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Bernard Cawley NAR 89040 L1 - Life Member SAM 0061 AMA 42160 KG7AIE |
#12
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Testing a link to see if Photobucket is still playing nice.
This is a photo of member Don Magness' (barone) A-20 Demon, just to make sure I'm not tooting my own horn.
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I love sanding. |
#13
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Quote:
I've tried taking launch photos, but I've not had success like this. I even tried building a camera controller that was linked to the launch controller. Is there some trick to get this quality of shot? |
#14
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I use a digital SLR. That particular shot was with a Nikon D80 at 1/2000 sec. I turn off autofocus and do it manually so there will be no delay when I hit the shutter release. I launch with 12v and have a good feel for when it will lift off.
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I love sanding. |
#15
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Quote:
A cheaper, "cheatier" approach is burst mode. I have a low end camera that'll do about nine frames a second while the shutter release is held down. Usually one of them is a good picture of the rocket under initial thrust. Either that or the igniter fails and I get about 30 pictures of the **** thing just sitting there. Or it's an E motor and I get a great picture of flaming rocket bits flying in all directions.
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Rich Holmes Camillus, NY Secretary / newsletter editor Syracuse Rocket Club http://richsrockets.wordpress.com |
#16
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Quote:
That will help in place of timing a liftoff, but for a good quality image, there is no substitute for good glass (lens) and high shutter speeds. You can slap a 20 mp sensor in a cheap camera and it won't look near as good as a 10 mp sensor with good glass in front of it. The Nikon D80 that I shot those photos with has a 10 mp sensor, less than some smart phones, but much better for rocketry because of the lens. That said, these images are almost 10 years old and my D80 is a dinosaur compared to the 20-25 mp cameras of today, but with good glass, it will hold it's on. http://forums.rocketshoppe.com/showthread.php?t=5508 http://forums.rocketshoppe.com/showthread.php?t=5511 http://forums.rocketshoppe.com/showthread.php?t=6101 Quote:
Those are always great pictures! .
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I love sanding. |
#17
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Oh, no question. But then, I'm in it for the flying, not the photography. The pictures I get are not the best but are good enough for my purposes. Here's one for comparison. Quote:
F'rinstance:
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Rich Holmes Camillus, NY Secretary / newsletter editor Syracuse Rocket Club http://richsrockets.wordpress.com |
#18
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Love your cato shot, but I feel bad all that sanding went to waste.
I've had several over the years, most looked like yours. I had one that was a little different. It was a cluster with a D12 and two A10-3T's. One of the A10's blew and spit itself out mid flight.
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I love sanding. |
#19
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Horn tooter.
Great pictures, both. And that's an awesome A-20 Demon. Lost mine at da club a while back, but have Sandman decals and wrap to clone it again.
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Just completed: Estes Cherokee-E, Estes Multi-Roc. Current project: Painting the roll pattern on my new Ventris build, gifted me by the estimable Dr. Houchin. |
#20
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That belonged to one of our earliest YORF members, Don (barone). He hasn't logged on here since late 2012. He was living around Memphis when I took that picture but I don't know what's become of him.
Edit: remove incorrect name.
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I love sanding. Last edited by tbzep : 05-30-2018 at 08:44 PM. |
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