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Multi-Rotor Discussions
Other › Help with picking Multi Rotor for AP
06-04-2012 06:42 PM  5 years agoPost 21
sjgusmc21

rrApprentice

San Antonio, Texas

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So, here she is thus far.....thank you all for you help. Yeah, no worries, knew they didn't do 6s.

OK, so why is it so hard to attach a pic? WTH?

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06-04-2012 08:20 PM  5 years agoPost 22
HansAuf

rrApprentice

Gainesville, Florida, USA

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Looking great. How long did you cut your booms? Just be careful of your weight if you leave them full length. When you do a big ship with long arms, you will need to take into account the total weight of the frame, battery, etc, everything you are going to carry into account. Especially since you mentioned 10,000mah worth of batt. You can't consider it spread across all the booms evenly since the upward force will change on all the booms as the ship flies. Also those motors are capable of fairly strong thrust so that adds to the force. Just some food for thought.

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06-04-2012 10:36 PM  5 years agoPost 23
sjgusmc21

rrApprentice

San Antonio, Texas

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Hans, I haven't cut them yet. Actually I was going to ask you what length you had cut yours to. Not going to go that large on the batteries. Will follow your lead, sounds like you have it figured out. What do you think of this camera mount with legs? I like it but look heavy. Again, thank you for your help!

http://www.fpvcameramount.com/product.php?id_product=1

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06-04-2012 11:38 PM  5 years agoPost 24
gtxkid

rrVeteran

Gulf Breeze Florida

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Leave yourself some room between the tip of the props for changes you might make up or down in the future.

Futaba 14Mz / 1300mm Multi rotor / Logo 10

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06-05-2012 01:06 AM  5 years agoPost 25
HansAuf

rrApprentice

Gainesville, Florida, USA

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Hans, I haven't cut them yet. Actually I was going to ask you what length you had cut yours to. Not going to go that large on the batteries. Will follow your lead, sounds like you have it figured out. What do you think of this camera mount with legs? I like it but look heavy. Again, thank you for your help!
Mine are cut to 300mm. I cut them shorter than I have seen some other folks do because I was worried about payload weight versus strength. However, hindsight 20/20, it would be interesting to see how it flies with 400mm arms. The rig is plenty stable as it is now, but I doubt the additional length on the arms would really be affected since they are so rigid. I would not go a fill 500mm on the aluminum arms though. Anything over 400mm for me would have to be PLT CF. So if you want to be 100% sure of the strength, cut them between 300 and 350mm. If you want to go to 400mm I really think it's fine.
Leave yourself some room between the tip of the props for changes you might make up or down in the future.
Exactly! I like to leave over 1x the equivalent of my prop size between prop tips. At 300mm, I am 1.2 times the total prop distance.

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06-05-2012 05:46 AM  5 years agoPost 26
sjgusmc21

rrApprentice

San Antonio, Texas

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Thank you for your help. Will measure out the arms in the morning. So, what do you think of this camera mount?

http://www.fpvcameramount.com/product.php?id_product=1

Seems reasonable, as most are outrageously over priced. Thanks.

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06-05-2012 12:39 PM  5 years agoPost 27
HansAuf

rrApprentice

Gainesville, Florida, USA

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It does but it looks really heavy and with the flat face, it seems like it would create a lot of wind resistance. My only concern with that one is that if you're trying to stay stationary and grab video/pictures, it's likely going to make more susceptible to the wind. I don't know first hand though, so I am not claiming to be an expert on it. See the gimble for me is my hold up on putting an SLR or NX5 on my hexa. I cant find a gimble I like that does not cost 600 bucks. I have been looking since October.

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06-05-2012 01:03 PM  5 years agoPost 28
sjgusmc21

rrApprentice

San Antonio, Texas

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Hans I will tell you that these gimbals are way over priced. I wanted one for my Trex 800, but just couldn't find myself spending the $1500 or so as the going price. So, I spent months researching all of the parts, costs, etc, and finally made my own. Minus the Picloc 3x, I guess I have about $370 in it. All I used was my dremel tool (I absolutely love my dremel), A LOT OF FINGERNAIL FILES FOR SALLEYS, and lots of time. Works like a charm. A little heavy, but all I need to do is cut some holes in it and done. So why don't I make my own? Well, considering I have a 1 month old baby girl, I don't have the time right now. But still might. It would be the smart thing to do.

This multi rotor thing is new to me. But the cost of image/video stabilization is very low compared to a 800 sized heli. The weight issue I have to get used to again.

As for the length of the arms, when you state 350mm (or whatever length), are you talking the total length of the arm, or measured from the outside of the frame to the end of the arm? Thanks again Hans.

BTW...really diggin' your ground station! Great job!

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06-05-2012 03:30 PM  5 years agoPost 29
HansAuf

rrApprentice

Gainesville, Florida, USA

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Ah, I know what you mean as far as the time goes. I work for probably one of the largest companies in the world. They literally bleed us dry as far as workload goes. As for the length of the arms, I am measuring one single arm tube. So actual length from motor to opposing motor would be arm length + center disk length + arm length. Thanks on the ground station. It works great as long as I don't do something stupid like I did this weekend and forget to hit the diversity on.

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06-05-2012 03:52 PM  5 years agoPost 30
GyroFreak

rrProfessor

Orlando Florida ...28N 81W

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For a low cost easy way to take stills I use a camera with a built in intervolometer ( timed sequential picture taking) at 10 second intervals during the flight, then on the computer I edit and delete most. This way I concentrate on flying and pointing the quad. No servos, no extra person to frame it.
Just a suggestion for low cost beginner start-up AP.

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

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06-05-2012 04:43 PM  5 years agoPost 31
HansAuf

rrApprentice

Gainesville, Florida, USA

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That's a cool idea. Ok, so what I'll do is grab an ardiuno core, work up some code for an intervalometer, integrate that into... Sorry my mind starts whizzing like that when I hear cool suggestions.

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06-05-2012 05:02 PM  5 years agoPost 32
sjgusmc21

rrApprentice

San Antonio, Texas

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Hans, you must be one smart dude. As for me, KISS applies...born and raised in Texas and a retired Marine Infantryman....Keep It Simple Stupid...

Anyway, GyroFreak that is exactly what I do with my helis...I have a 2Ti and a 3Ti (really good deal on the 2Ti) with CDHK installed on them. Freak'n awesome. Anyway, set it for about 5 - 10 second intervals and let her go.

I don't think the Nex-5n has intervolometer on it. But 1080P @ 60fps it does...so now I need to find a happy medium.

I also have a blip setup that works great, but that is for two person operation. I will have FPV on all of my fleet...just not for flying FPV unless it is a EXTREME emergency. Hope it never gets there. Still brainstorming my Ground Stations.

Can't wait to move back to Texas.....Been a long time. Austin is looking so much better day by day.....

Hans, don't work to hard. Life is too short. I will be 49 in a couple of days so I have learned this the hard way. Just my opinion.

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06-05-2012 05:42 PM  5 years agoPost 33
madgadget

rrApprentice

St Louis MO

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Sorry my mind starts whizzing like that when I hear cool suggestions
Hans your company might be bleeding your time but that keeps the muscle in your head sharp,,,apparently.

The brain is a muscle and must be flexed.
Hey hans if you do indeed code for the ardiuno let know would ya?
I'm in the middle of converting my tri to y4 and multiwii fc. But I must admit I had better than expected results with the kk board after some tweaking.. fwiw. stills and 720 land survey video @ 30fps.

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06-05-2012 06:33 PM  5 years agoPost 34
HansAuf

rrApprentice

Gainesville, Florida, USA

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born and raised in Texas and a retired Marine Infantryman....
Texas! My favorite state. I have spent tons of time there. TLOCA <--- OMG the steaks there. Also Best Steak in the United States is in Texas. In Victoria. And The Salt Lick in Austin is probably my 2nd Favorite BBQ in the US. Rendezvous in Memphis being #1 (sorry, hehe). Just lost a good buddy that lived there a few weeks ago. And as a side note, thanks for serving this great country! I have serious respect for the US Military and it's soldiers.
Hans, don't work to hard. Life is too short. I will be 49 in a couple of days so I have learned this the hard way. Just my opinion.
I'll be 43 this year and I think I am starting to feel it. I am putting non-refrigerated items in the fridge and bitching about not being able to find them. Cel, Keys, etc.
Hey hans if you do indeed code for the ardiuno let know would ya?
I'm in the middle of converting my tri to y4 and multiwii fc. But I must admit I had better than expected results with the kk board after some tweaking.. fwiw. stills and 720 land survey video @ 30fps.
Create another thread for it so we don't jack this one from sjgusmc21, and I'll see if I can help out. Put your specs and what you're trying to do with it.

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06-05-2012 07:21 PM  5 years agoPost 35
madgadget

rrApprentice

St Louis MO

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Ooops
good catch on the hijack, a little excitement and I got distracted.

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06-05-2012 07:38 PM  5 years agoPost 36
sjgusmc21

rrApprentice

San Antonio, Texas

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I'll be 43 this year and I think I am starting to feel it. I am putting non-refrigerated items in the fridge and bitching about not being able to find them. Cel, Keys, etc.

That's funny....wait until you are nearly 50....then again, you won't remember being 43.... Seriously though, thanks for all of your help Hans....sure I will be begging for some more help soon.

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06-05-2012 09:05 PM  5 years agoPost 37
HansAuf

rrApprentice

Gainesville, Florida, USA

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good catch on the hijack, a little excitement and I got distracted.
Np. Just want to make sure your problem gets attention too.
Seriously though, thanks for all of your help Hans....sure I will be begging for some more help soon
Yepper. NP. Glad to help if I can.

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06-06-2012 04:10 PM  5 years agoPost 38
sjgusmc21

rrApprentice

San Antonio, Texas

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Hans, is there any special settings for Turnigy Plush ESC's? I purchased the 40 amp sets. I don't know if setting these up is any different then setting up for heli's. Did a search and only found that there are some possible arming issues when using with a naza. I have the programing box on its way as well. Thanks.

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06-06-2012 06:26 PM  5 years agoPost 39
HansAuf

rrApprentice

Gainesville, Florida, USA

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Set Brake to OFF.
Disable Governor.
Set timing to your motors specification.
Note: If no spec provided, set to your preference. I never fly with high timing though. Try it at medium and if the motors get hot, drop to low. The lower you set it, the longer the flight time. The Higher you set it the better performance. But if the motor can't handle the higher timing it will possibly get hot and fail.
Set Cutoff to low.
Set Battery type to NIMH (Not LIPO).
Note: If you set to LIPO, the ESC will use it's cutoff. If you set to NIMH, the ESC will let the battery run as low as it can until there is a loss in power. Why would you want to ruin a pack some say? Well, with no LIPO cutoff you MIGHT ruin a lipo. With LIPO cutoff DISABLED, you will have a slow descent when the power starts to go out if you over-drain your battery. Anywhere between $15 to $40 bucks depending on the battery. With higher end 4S like 5000mah, etc running more toward $100 total cost. With LIPO cutoff ENABLED, you will have a few seconds and some minor power bursts before your ship falls to the earth and introduces itself to the Terra Firma with reckless abandon. Thus destroying your ship and the aforementioned battery. The reason I typed all this out was because some people still insist on using LIPO cutoff on their multirotors ESC's so they can "save the battery".

Last and definitely not least... Calibrate your throttle range.
Note: If you skip this, your ship will fly like crap. I do this on all 4/6/8 ESC's at once using a cable I made connected straight from the throttle channel of the receiver, bypassing the flight controller, and then plugging all the ESC's into it. So Connections are RECEIVER > MULTI CONNECTOR ADAPTER (Plugged into throttle channel on REC) > All ESC's plugged into the multiconnector adapter. Only one red wire on one of the ESC's is needed for receiver power. The rest of the ESC's should be connected to power via the battery plug that is normally supplied by the flight battery. Most ESCs, the throttle calibration is as follows. Turn on transmitter > Move throttle to highest position > Power up ESCs > wait for double tone > drop throttle to lowest setting > wait for additional acknowledgment tone > disconnect power to ESCs > Turn off transmitter.

If you want to buy an adapter like I mentioned, Witespy sells them. They're reasonably priced, and he's a good guy personally. If you want to make it instead, it's pretty easy.

Speed Controller Calibration Cable quad+ (1 to 8)
http://witespyquad.gostorego.com/ac...les-futaba.html
Speed Controller Calibration Cable for Quad
http://witespyquad.gostorego.com/ac...tion-cable.html

Phew! Sorry if that was too long-winded.

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06-06-2012 07:26 PM  5 years agoPost 40
sjgusmc21

rrApprentice

San Antonio, Texas

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Wow...that is A LOT of information and I do appreciate it. Have set many ESC's, for airplanes and helis, but never for these. Thanks for the advice on the lipo cutoff. I always time mine and/or use a monitor. Lots to digest....I did order the cable. Will post when I get to this stage...still waiting on the motors and programer.

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