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Aerial Videography and Photography Aerial Video/Photo from R/C Helicopters |
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12-29-2012, 05:01 AM | #1 (permalink) |
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Join Date: May 2012
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Balancing/CG on AP heli
How do you go about balancing the cg of an AP heli that has two 6s lipos on the boom and a gimbal hanging off of the front? Is it just normal procedure? It sits pretty level holding the blade grip perpendicular to the boom, but that doesn't fully account for an overall balance, does it?
thanks |
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01-01-2013, 11:30 PM | #2 (permalink) |
Join Date: Aug 2012
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please please please show us a photo
first off that would be funny as hell to see and second it could give us some kind of insight on what we are dealing with i dont think the lipos on the boom would be too reliable |
01-02-2013, 04:00 PM | #3 (permalink) |
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It's an aerial photography setup, PS1 gimbal on the front with a battery mount on the boom. This is a pretty common setup.
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01-02-2013, 05:22 PM | #5 (permalink) |
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Join Date: Dec 2008
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Just simply hold the helicopter by the rotor brake disc between thumb and middle finger and see how it hangs. If you have no brake disc on top then you can turn the blades perpendicular to the copter and suspend it by the blade gips. You want to see it sit level but a couple degrees either way generally makes little difference.
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DJ Vegh PhotoShip One |
01-02-2013, 05:29 PM | #6 (permalink) |
Join Date: Aug 2012
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My heli isn't correctly balanced (goes forward)
But I just trim it out... Other than that this setup is way out of my league Sorry |
01-02-2013, 06:39 PM | #7 (permalink) |
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As always, thank you DJ. That's what I was thinking. I'm using a small level on the tail and on the front and holding it from the blade grips. And as you said, it seems anything within +/- 5 degrees will "work".
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01-03-2013, 10:22 AM | #8 (permalink) |
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I've been doing a lot of research into helicopter flight dynamics recently (full scale), and one of the things I've read is that it's better to heli slightly nose heavy. This is because the rotor downwash hitting the boom tends to try to push the tail down, and a bit of extra weight on the nose helps counter this.
Anybody seen anything like that on RC?
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-Rob Former Managing Director of Maxxum Robotics Inc. |
01-03-2013, 10:47 AM | #9 (permalink) |
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What are you going on about? Do you know anything about AP Helis?
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-Rob Former Managing Director of Maxxum Robotics Inc. |
01-03-2013, 02:08 PM | #11 (permalink) | |
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Quote:
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01-05-2013, 07:49 AM | #12 (permalink) |
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Ok, then please sit back and read a little more here before making snide comments about other people's setups. Putting batteries on the tail boom for balance on an AP heli is extremely common.
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-Rob Former Managing Director of Maxxum Robotics Inc. |
01-05-2013, 07:52 AM | #13 (permalink) | |
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Quote:
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-Rob Former Managing Director of Maxxum Robotics Inc. |
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01-05-2013, 07:18 PM | #14 (permalink) | |
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Quote:
I use a boom mount for two 6cell lipos that can be moved forward and aft to adjust for CG. I usually have someone help me lift the heli, I hold the rotorhead, partner hold heli horizontal with the ground. When released, If heli falls to one side or the other, I adjust the batteries accordingly. Heli if all up weight. Everything I use while shooting is on the heli. DJ I think I might have repeated you post, sorry about that.
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01-05-2013, 07:25 PM | #15 (permalink) |
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We teater ours on a dowl. Putting the dowl under the landing gear. Getting cg so that dowl is just under main shaft with a hair bit of weight forward. Seems to be most precise method for us.
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01-08-2013, 06:13 PM | #16 (permalink) | |
Join Date: Dec 2010
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Quote:
http://aerialskycam.com/Contact_Us.php |
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01-09-2013, 12:20 AM | #17 (permalink) |
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I've been trying many setups to find a quick efficient way to measure the cog, I've found my 6-8" level works great. I hang the heli with the blades both parallel and perpendicular to measure all axis's. (no longer doing left right balance/ Just on initial setup) and place the level on various places that should measure true. This is probably a much bigger issue for me or anyone using autopilot systems.
Quick question for the pro's in this thread, is there any difference between say the ps1 battery mounts and the infinity hobby mounts? The infinity creates a tray for the batt on each side. They are very similar. Thanks for the help |
01-09-2013, 11:33 AM | #18 (permalink) | |
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Quote:
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-Rob Former Managing Director of Maxxum Robotics Inc. |
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01-09-2013, 07:25 PM | #19 (permalink) | |
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Join Date: Jun 2009
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Quote:
I made an eye bolt(bolt, washer, solder) for the brake disk bolt hole. I then hung it from my garage ceiling by some wire. I'll tell you, ever messed with a triple beam? |
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