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Ace Hobby . Esprit Model . Thunder Power RC

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Aerial Photography and Video > Help with Waves (video included)
 
 
daytonabeach
Elite Veteran
Location: Oslo, Norway

My Posts This: Topic  Forum

So you say HS equals vibration freq, and not what the camera are attached to and how?

Never argue with an idiot, he'll drag you down to his level and beat you with experience...
11-07-2009 09:38 PM
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SeismicCWave
Veteran
Location: Hilo, Hawaii

My Posts This: Topic  Forum		>>So you say HS equals vibration freq, and not what the camera are attached to and how<<

I don't buy the head speed theory completely. It is something that sounds like it makes sense on paper but in practice is very hard to do.

1) A helicopter vibration is not always at one frequency.
2) You cannot always make a helicopter head speed to spin at 1800 RPM.
3) Helicopter comes in all sizes and head speed varies.
4) Blades come in all sizes and head speed varies.
5) Even when the head speed is exactly 1800 rpm the vibration frequency to the camera depends on the dampeners.
6) Shutter speed is not the same as frame per second. A video camera can be recording at 30 frames per second but the shutter speed is not necessarily 1/30th of a second.
11-07-2009 10:12 PM
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daytonabeach
Elite Veteran
Location: Oslo, Norway

My Posts This: Topic  Forum		Thanks, you got to my point, but i didnt wanna be rude

Never argue with an idiot, he'll drag you down to his level and beat you with experience...
11-07-2009 10:20 PM
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Water Viper
New Heliman
Location: Jackson, MS

My Posts This: Topic  Forum		Ok, so if my head speed at 100% is 2866 rpm I would have to set my throttle curve to 63% to get 1800 rpm. That seems really low for a 500 and 425mm blades. I wouldn’t think I would have much power if I needed to bailout. I currently have it dialed down to 73% to manage my erratic flying.

I guess in a couple of days I will give it a try and report back. I’ll make sure I do it on a calm day, with plenty of room.
11-08-2009 12:51 AM
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SeismicCWave
Veteran
Location: Hilo, Hawaii

My Posts This: Topic  Forum		>>so if my head speed at 100% is 2866 rpm I would have to set my throttle curve to 63% to get 1800 rpm. <<

Your 500 may not like to fly at such a low RPM. That's why I said each helicopter is different. I believe it is achievable if some one is flying a 600 machine with 600 to 700 mm blades. But anything smaller will need more than 1800 rpm and anything larger will have less rotor RPM.

Edit:
OTOH 2866 seems a little high for the 500. You may want to dial it down to 2400 rpm which is still within the 30 frames or 60 frames per second multiples.
11-08-2009 12:56 AM
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Water Viper
New Heliman
Location: Jackson, MS

My Posts This: Topic  Forum		I pulled those figures off of the internet. I have no clue what my actual head speed is. I figured 1800 rpm on a 500 would be low.

Although I don’t know my head speed, I can say that 73%-75% throttle curve made a difference, but my tail started to wag. I will play with the gain and see if that helps.
11-08-2009 02:40 AM
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SeismicCWave
Veteran
Location: Hilo, Hawaii

My Posts This: Topic  Forum		For the 500 you need over 2000 rpm for sure.
11-08-2009 03:30 AM
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Water Viper
New Heliman
Location: Jackson, MS

My Posts This: Topic  Forum		Ok, I lowered my throttle curve and ran some test. I set it to 68%, 65%, and 63%. First things first. I have a 401/S9257 on the tail and I don’t think it liked the low head speed. When the wind kicked up, the tail started wagging.

63% throttle was too low to handle in the wind (at least for me and my setup). 68% throttle had a little more waves in the video than 65%. At 65% throttle, the heli was sluggish but I could manage it and the video was the best that I have gotten with the Sony Webbie.

I took Seismic’s advice and I’m focusing on flying smoother. I have a CG problem with my battery that I’m sorting out. I will also get some flybar weights.

I’m working on uploading vids.
11-09-2009 10:29 PM
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Water Viper
New Heliman
Location: Jackson, MS

My Posts This: Topic  Forum		This video was shot with my throttle at 65% on a windy day. This is probably the best I will get with this camera mounted on the battery tray.

What do you think? Any advice?
11-12-2009 12:09 AM
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Mikado Modellhubschrauber . Futaba-RC . Boca Bearings

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Aerial Photography and Video > Help with Waves (video included)
 
 
SeismicCWave
Veteran
Location: Hilo, Hawaii

My Posts This: Topic  Forum		Looks pretty good to me. You have definitely smoothed things out a lot. You realize you have a right lean on your helicopter. I would tilt the camera a little to the left or make something that let the camera swing free on the roll axis to level the footage.
11-12-2009 02:46 AM
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Ace Hobby . Esprit Model . Thunder Power RC

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Aerial Photography and Video > Help with Waves (video included)
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