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Jul 29, 2012, 12:21 AM
LOAD "FLIP-FPV",8,1
vic20owner's Avatar
Quote:
Originally Posted by Muddie
Tom,

I'd have to say they're hot based on your guidelines. These are the blue Keda motors you/Paul used to use on the 450 quads.

The motors that get hot are opposing and coincide with the arms that have the warp see-saw effect.

I'm currently in the process of upgrading the ESC's and motors, so we'll see if that makes any difference.
Ok, you are not the first to say that with those motors. Strange thing is I have flown those motors with 8x4.5 and 9x4.7 and they did not get hot, only warm? I am flying 2200, are you flying a bigger pack?

I will try again tomorrow to be sure.
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Jul 29, 2012, 12:49 AM
Registered User
imagebuff's Avatar
My new HT-FPV frame also has a see saw effect when laying flat on the table. I've disassembled the entire frame, carefully examined all the arm joints for irregularities and simply could find none. All the stand-off's are the exact same length, etc.. Put it back together and the see saw is back. I am just starting my build and this is a bit disconcerting. I'm hoping it doesn't cause any real flight issues.

Does anyone's frame sit level without the see saw? Curious.
Jul 29, 2012, 01:22 AM
Registered User
Laddy McMurry's Avatar
Quote:
Originally Posted by vic20owner
Ok, you are not the first to say that with those motors. Strange thing is I have flown those motors with 8x4.5 and 9x4.7 and they did not get hot, only warm? I am flying 2200, are you flying a bigger pack?

I will try again tomorrow to be sure.
I had this problem and it is the CG. Move the batter way back and try it.
Jul 29, 2012, 02:06 AM
Registered User
Quote:
Originally Posted by imagebuff
My new HT-FPV frame also has a see saw effect when laying flat on the table. I've disassembled the entire frame, carefully examined all the arm joints for irregularities and simply could find none. All the stand-off's are the exact same length, etc.. Put it back together and the see saw is back. I am just starting my build and this is a bit disconcerting. I'm hoping it doesn't cause any real flight issues.

Does anyone's frame sit level without the see saw? Curious.
I am aware of the see saw effect as it happened to me confused me until I realized that the tightening of the screws were out of wack, meaning I had some screws tighter than others, disassemble it again and place the screws in about 10 % once they are all in @10% try to screw them all evenly. It does go way, just keep at it..good luck
Jul 29, 2012, 02:10 AM
Registered User
jpsabo's Avatar
Could you post some pictures? Mine assembled without issue and there is no warping.

Quote:
Originally Posted by imagebuff
My new HT-FPV frame also has a see saw effect when laying flat on the table. I've disassembled the entire frame, carefully examined all the arm joints for irregularities and simply could find none. All the stand-off's are the exact same length, etc.. Put it back together and the see saw is back. I am just starting my build and this is a bit disconcerting. I'm hoping it doesn't cause any real flight issues.

Does anyone's frame sit level without the see saw? Curious.
Jul 29, 2012, 05:00 AM
Registered User
Casey_S's Avatar
Success. I haven't glue insulated anything yet but I soldered the battery lead to a new positive pad and the ohm meter showed the same amount of resistance as the other connections when I used it on the XT60 connector. Then I crossed my fingers and plugged in a 4S lipo, and that familiar ESC chime rang.

It's not the prettiest soldering I've ever done, but considering the thickness of the wire I couldn't have done much better without pouring on the solder and running the risk of it bridging on to an adjacent pad. It works, and it's soldered on there securely (I was able to start lifting the entire frame when I tested how strong the solder was), so I figure after it's all insulated it'll be fine.



Jul 29, 2012, 09:56 AM
Registered User
AlanFlorida's Avatar
Great to see that you are making progress!
Jul 29, 2012, 12:04 PM
'FPV'er...not a "LOS'er
Vantasstic's Avatar
Quote:
Originally Posted by imagebuff
My new HT-FPV frame also has a see saw effect when laying flat on the table. I've disassembled the entire frame, carefully examined all the arm joints for irregularities and simply could find none. All the stand-off's are the exact same length, etc.. Put it back together and the see saw is back. I am just starting my build and this is a bit disconcerting. I'm hoping it doesn't cause any real flight issues.

Does anyone's frame sit level without the see saw? Curious.
Torquing sequence can make a BIG difference in how whatever you're tightening comes out. If you tighten each screw as you put it in then you run a much larger risk of warping...whatever it is....jet engine parts, car engine heads, multi-rotor frames.

When I assemble my stuff I lightly snug the screws down, then you can check for any twisting, apply corrective counter twists, check again, and tighten (cross pattern is better) the screws...even if just a little at a time until they're all good.

A little twisting probably isn't going to cause any serious issues, other than cosmetics. Tom posted a picture of a motor purposely mounted way out of plane with the others and the frame flew fine.
Jul 29, 2012, 12:06 PM
Registered User
Quote:
Originally Posted by Estuardon
I am aware of the see saw effect as it happened to me confused me until I realized that the tightening of the screws were out of wack, meaning I had some screws tighter than others, disassemble it again and place the screws in about 10 % once they are all in @10% try to screw them all evenly. It does go way, just keep at it..good luck
Tried this all morning and it did sound like a very possible fix. Unfortunately it isn't the fix in my case.

With just the arms fitted and the middle plate in place I am able to start all for screws (1 for each arm) and everything is fine. The instant that one screw gets any sort of torque to it from tightening the problem begins.

I'm assuming that something needs to be filed. I'm okay with that but at the same time I do not want to introduce more problems. My guess would be the area adjacent to the upper tabs on the offending arm?

Any thoughts?
Last edited by robstach; Jul 29, 2012 at 12:14 PM.
Jul 29, 2012, 12:11 PM
Quadcopter Addict
Not exactly what I had hoped for...

GoPro Camera Crash (0 min 12 sec)
Jul 29, 2012, 12:36 PM
Registered User
Quote:
Originally Posted by oddcopter
Not exactly what I had hoped for...

http://youtu.be/Ra9LQpm3oG4
Thats actually pretty cool. What are the odds?
Jul 29, 2012, 12:48 PM
Registered User

Seesaw Fixed


Okay - don't ask me how or why this worked but it did.

After a few hours of drinking around with this I tried a new approach. If your frame is doing what mine was, you will have a diagonal seesaw from rear to front.

Had mine apart a few times and the more I worked with it the more I got lost. Was it the front arm? The rear arm? Another arm? Not as Simon,e as it looked.

So.. I put the frame back together with three arms in place and the front seesaw arm on its side. The only screws through the middle plate were the three for the properly installed arms.

At this point everything sat properly.

Next, I rotated the loose arm up and into place. Lift the front of the middle plate to give some clearance. Got the last arm into place, tightened it down and my seesaw was gone.

Followed up with cross pattern of remaining screws and life was good again.

I did notice that the escs in the front arms are a way more snug now and I'm wondering if since they were flexing the inner-most portion of the arm in some way. I used to be able to slide them around a bit but now they're clamped down solid which I'm hoping is not a problem. We shall see.

Anyway - worth a shot if you are having the same issue.
Jul 29, 2012, 12:50 PM
Registered User
Quote:
Originally Posted by oddcopter
Not exactly what I had hoped for...

http://youtu.be/Ra9LQpm3oG4
Wow! Rubber bands popped off?
Jul 29, 2012, 01:01 PM
Quadcopter Addict
Quote:
Originally Posted by epyonxero
Thats actually pretty cool. What are the odds?
Quote:
Wow! Rubber bands popped off?
No, I had it attached with some sorbothane and that stuff is so sticky that I decided to try it with the rubber bands off. Unfortunately, I don't have it tuned properly (might be an ESC issue - kinda stumped) and it vibrated off. When I saw it, I instinctively cut the throttle and this was the result. I thought it looked kinda cool too. Also, this is a non stock GoPro lens that doesn't handle vibrations well.
Jul 29, 2012, 01:02 PM
'FPV'er...not a "LOS'er
Vantasstic's Avatar
Quote:
Originally Posted by oddcopter
Not exactly what I had hoped for...

http://youtu.be/Ra9LQpm3oG4
ROTFLMAO!!!! The vibrations were horrible. The camera falling off wasn't spectacular, but watching the quad landing on top of the camera...PRICELESS~!!!!


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