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HomeAircraftHelicopterAerial Photography and Video › Front mount Vario Acrobatic
04-09-2010 10:10 PM  8 years agoPost 1
Disciple4123rrKey Veteran - USA - My Posts: All  Forum  Topic

Well Ahmet (Helicek) with his recent Vario Acrobatic front mount inspired me to complete a project I had been pondering for a while. In times past I had made dozens of underslung mounts and front mount out of PVC and wood. this is the next generation of front mount for me, aluminum tube and ABS plastic, directly attached to the upper frame area. It flies very crisply, I was in 25 mph winds today and the DJI was holding position admirably, something that the underslung mounts could not accomplish in wind. It doesn't vibrate either. The ring mounts are a bit soft, so I support them with rubber bands to prevent shearing in months to come. The weight went from 24lbs, to 22lbs which helps too.

The booms are 7/8" aluminum (22mm), the white and black pieces are ABS plastic 1/4" (6mm) thick. The process included something that has worked for a while for me: design parts on CAD on Emachineshop, print to paper, and use the templates to mill. There is a deliberate 8 degree downward angle to the booms to prevent flybar strikes.

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04-10-2010 06:06 PM  8 years agoPost 2
Helicek

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istanbul - turkey

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Eric,
the heli looks good. I like the way you manufactured those clamps. It is also very clever to dial in some downward angle to the main tubes. I like it very much when people share their ideas on this forum. Thats the way to go
I would also like to fly autonomous. I have read quite a lot about the DJI and the HC Profi. Please let us know how you feel about the DJI. Personal experience please. Pros and cons.
I am sure you are on the right track.
Good luck.
Ahmet

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04-11-2010 12:26 PM  8 years agoPost 3
Disciple4123

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USA

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...

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04-11-2010 03:44 PM  8 years agoPost 4
Makiedog

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Minneapolis

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What's the purpose of the rubberbands?

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04-11-2010 09:36 PM  8 years agoPost 5
Disciple4123

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USA

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The rubber dampeners selected are a little light duty for the application, they also are made of non fibrous rubber. To prevent fatigue shearing and dropping the cam I put the bands on. Eventually Ill get the next higher rated dampeners for it. The black plate does not touch the tubes, although the pic makes it look that way.

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04-30-2010 09:14 PM  8 years agoPost 6
GyroFreak

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Orlando Florida ...28N 81W

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I have played with several underslung mounts and just can't get all the vibration dialed out. For still shots it works fine but I was contemplating build a front fixed mount like yous for my 720mm electric. Do you find you can dampout the minor vibration better with a front mount like yours.
I'm strickly a hacker and don't want to do any serious paid photo work, it's the challange of refining without buying expensive stuff.

I think about the hereafter. I go somewhere to get something, then wonder what I'm here after ?

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05-01-2010 03:41 PM  8 years agoPost 7
KarbonBird

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Australia

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Great looking heli ..

Yes, things do seem to have quietened down around here a bit. I wonder what the reason is for that - maybe everyone is out there flying and making money??

What sort of heli is that BTW? Is that a 4-stroke motor??

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05-01-2010 04:13 PM  8 years agoPost 8
Disciple4123

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USA

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Gyro: Regarding vibrations and front mount vs underslung. There are factors that play into what sort of suspension your underslung mount had, etc. But in principle front mounts amplify vibes as they are out on a boom far from the mainmast and the CG. Anyhow it isn't an issue with a low vibbe heli to start with. With your electric you will find that the weight reduction and crisper handling of the front mount may increase your flight times (greater cyclic efforts seem to be needed to manage an underslung than a front, and my heli lost 2lbs when I went front mount). By the way, I got rid of the rubber bands and just run the dampeners now. If I bring the dampeners in on the lateral dimension, it will have some auto leveling going on, maybe I'll try that soon.

Karbonbird, thanks. I think the Americans are hiding and the rest of the world is waking up to AP nicely. That is the pattern I have seen since joining 6-7 years ago. Maybe our FAA played a part, maybe the economic downturn kicked out a lot of the posters, either way this industry benefits from discussion.

The heli is a Vario Acrobatic, 2 stroke G270RC (Hanson) engine.

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