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Old 12-16-2012, 11:51 AM   #1
Goldenhour
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Default My latest copter modification

I was advised to move my packs into a "saddlebag" position like Bergen does on some of his copters.
Idea is to get the battery mass as close to CG as possible.
Has latex foam separating the aluminum from the carbon fiber. Felt backing so the bolt heads are relieved from the batteries. And a zip tie on each that wraps around the frame and aluminum to bear some of the load the bolt heads also bear.
I made it with tear downs in mind ie, easy to get off and put back on. Designed the holder so it can be moved about 1 1/2" aft with the extra holes in the holder (minus the zip tie).

Prototype A
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Last edited by Goldenhour; 12-25-2012 at 02:46 PM..
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Old 12-16-2012, 12:33 PM   #2
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Nice job
Interested on how it performs.
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Old 12-16-2012, 09:36 PM   #3
tott
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Looks good.

Have you had a chance to check the CG of the heli with this setup In all axis's ???

The next time you remove the "holders" it would be very helpful to know the total weight including the bolts and zip ties, etc.. if you don't mind.

Also, keep an eye on the packs where the "holders" make contact after the first few flights to insure there is no damage from vibrations or movement. Though I do not forsee either of those being a problem, it never hurts to be over cautious with lipos.

If you dont mind me asking again, What is the all up weight of your heli including camera and gear at this point of the build ??

Thanks,
Jason
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Old 12-16-2012, 10:40 PM   #4
Goldenhour
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Quote:
Originally Posted by tott View Post
Looks good.

Have you had a chance to check the CG of the heli with this setup In all axis's ???

The next time you remove the "holders" it would be very helpful to know the total weight including the bolts and zip ties, etc.. if you don't mind.

Also, keep an eye on the packs where the "holders" make contact after the first few flights to insure there is no damage from vibrations or movement. Though I do not forsee either of those being a problem, it never hurts to be over cautious with lipos.

If you dont mind me asking again, What is the all up weight of your heli including camera and gear at this point of the build ??

Thanks,
Jason
The CG I'll have to wait until its ready to fly with the gimbal in place with camera. I would expect there will be fine tuning ahead.
Next time I take the holders off I'll let you know the weight.
The all up weight ready for pictures I believe was around 10 lbs. I could be off some on that.
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Old 12-17-2012, 07:57 AM   #5
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I thought that you needed the batteries back on the tail boom for balance?
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Old 12-17-2012, 08:40 AM   #6
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Cg will depend on his setup. My 600 size ap ship with 2xpt and t2i runnig 6cell 5300 the battery tucks directly under boom block for cg. If i was to up it to 10 or 12 cell the the batteries would have to be attached as he did for cg. My boom is aluminum 700 mm tail belt driven. But with the low weight of the t2i and 2xpt i have no need to run a higher voltage.
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Old 12-17-2012, 09:37 AM   #7
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Ok, thanks. Just seemed like everybody was running batts on the boom, but I guess not.
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Old 12-18-2012, 08:35 AM   #8
Goldenhour
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Quote:
Originally Posted by R_Lefebvre View Post
I thought that you needed the batteries back on the tail boom for balance?
Before I had the batteries on either side of the rear skid support, parallel to. I had balance then. And the batteries can be moved further back an inch and a half by repositioning the holders aft. I'll be close.
And I'm using a little Leica Dlux 5.
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Old 12-25-2012, 01:32 PM   #9
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Last night I was putting the finishing touches on my new copter mod. I had made a power extension to reach the Eagletree up front. What I didn't see and missed was when I made the extension I built it for polarity reversal.
I was plugging it in to check out the tail and vibration with the batteries in saddlebag position and the 10ohm spark arrester resistor started to smoke and sputter. Took about 3 seconds from plug in to unplug.
In that time I fried the resistor and gave my brand new Helijive 120hv that has never been in the air 7 blinks.
I am learning some very expensive lessons here lately. All with Kontronik esc's.
Three months ago my Jive 80hv with 30 flights and a popped cap was stolen on its way to or in Germany. No insurance or tracking. Now this.
1. Never send anything of value into the dark forest without an armed guard.Or tracking and insurance.
2.I am going to start continuity testing my circuits before putting the power to them.

Thanks Santa though for a long and healthy happy life and a sexy wife. Who I told I was going to Seattle to see my Brother while she went to her Daughters, so I could work on my copter. And checking for the little + and - on the EC5 connectors.
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