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  #11  
Old 05-18-2018, 01:39 PM
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<thread drift>

Quote:
Originally Posted by DavidQ
D'oh! I always thought they were like other motors, but with no delay and no clay cap on the top. I'm glad to get the real story.


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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  #12  
Old 05-29-2018, 07:56 AM
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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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  #13  
Old 05-29-2018, 07:18 PM
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Quote:
Originally Posted by tbzep
This is a photo of member Don Magness' (barone) A-20 Demon

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?
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  #14  
Old 05-29-2018, 07:31 PM
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Quote:
Originally Posted by DavidQ
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?

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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  #15  
Old 05-30-2018, 08:47 AM
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Quote:
Originally Posted by tbzep
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.

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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  #16  
Old 05-30-2018, 10:30 AM
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Quote:
Originally Posted by Rich Holmes
A cheaper, "cheatier" approach is burst mode.

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:
Or it's an E motor and I get a great picture of flaming rocket bits flying in all directions.

Those are always great pictures!



.
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  #17  
Old 05-30-2018, 11:28 AM
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Quote:
Originally Posted by tbzep
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.


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:
Those are always great pictures!



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F'rinstance:
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  #18  
Old 05-30-2018, 11:37 AM
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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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  #19  
Old 05-30-2018, 07:28 PM
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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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  #20  
Old 05-30-2018, 08:21 PM
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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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Last edited by tbzep : 05-30-2018 at 08:44 PM.
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