Just completed the assembly and setup of my new 3DR X4. I am using all 3DR parts including:
- Pix Hawk
- GPS/Compass
- 915 Mhz Tele,
- 3DR Power Module
- 3DR 850 Kv 28/30 Motors
- 3DR Simon. K ESC
- APC 10 X 4.7 Props
- FrSky Tx &Rx
- GCS
- Nexus 7 running DroidPlanner 2.0
I have completed my first flight using the default X4 Param. It was stable but I wanted it to have a more locked in feeling so I performed the Auto-Tune and all I can say is "WOW", really nice. I have made a mount for a digital camera to be mounted to the bottom for Ortho-mapping small areas. I use a Canon Elf 115 with CHDK for USB remote triggering by the PixHawk. Works great....
The DIY frame kit is excellent. It even included locktite. Great quality and it goes together nicely.
Thanks 3DR for such a great product....
Joe Millette
Comments
Back in 2011 and earlier i use to put the props on the bottom.
Here you can see on my old DW Hexa, front and back motor was on top and the others were all facing down.
https://www.flickr.com/photos/sidkites/6259277530/
I used this for a number of reasons, for orientation, wash/vibration when traveling forwards at speed.
The only negative effect that this setup had was efficiency.
Moving at speed, a + config is better than a X. Why?
( X + ) just look, going forwards at speed the rear motors / motors have to cope with dirty air from the front motors. If it's a + config then only 1 rear motor has to deal with dirty air.
The large X copter i used had obvious problems with the large props on the bottom because it was trying to pull air through the center of the frame as well as over the boom and mount.
@Joseph, Happy for you to have your props on whichever way you want :-)
Yes i agree the video i showed earlier was shot in a rush, from the last time i had this discussion.
Simon
@ Joseph, of course the props can hit either way. I'm talking about the motor itself. On the bottom, the prop shaft/nut will strike the ground first. For beginner, especially on pavement/cement, this could lead some motor damage. I tipped mine over all the time. But otherwise, I totally agree inverted is probably superior for an AP rig due to noise and vibration.
@ Will, you know I never thought of that in any of the rocket statements. Very good point.
If not put them back.....but this would put an end to a long standing debate that goes back very, very far
This was discussed at length in the past, and the person who was pitching it worked at nasa, and said that was why the rocket motors were below the motor. Or to put it in more useful terms for us, he said your put the CG ABOVE the propulsion.
I didnt bring it up at the time because I did not want to sidetrack things.....But when dealing with rockets if there not on top, well whatever the rocket is moving is going to get a might toasty. But since youve done....I would like to know if you had them on top first? and if not, Would you be willing to flip them to the top like everyone else and see how it goes? It may just change the setup for allot of us. Plus If your going to add 4 more, you dont have to flip them back!
With motors on the top or bottom, the props can hit. But even though, I'm glad im not a beginner. Been flying R/C for 23 years. Even with that. Sh*t happens right?
The only negative I can ever think of for inverted motors is one that beginners might want to keep in mind. One of the most common issues is tipping over on takeoff or landing. With the motors above, when you tip over, the arms hit the ground. With inverted motors, the motors hit the ground.
Yes, it's roughly the same reasons spoken here (less vibrations, more efficient flow) and also others, like possibility to remove motor bell (C-clip or screw removed) when stored.
Very cool. Do they say what their reason for the inverted motors?
FIY, look at this:
http://www.italdron.com/scrabble4.php
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