Motor Swapout Data...very good info and very interesting...

[helloman1976]

I've been following this thread with interest as I may have to upgrade the motors on my 550.
It currently weighs 2330g with standard dji motors, esc's, aeroxcraft landing gear, gimbal etc but I would like to upgrade the gimbal, which would push the auw up to about 2600g.
I would like to keep the Graupner 10x5 props and my 5000mah 3S lipos so which motors should I consider - the 800kv or 1000kv? Are the Turnigys a good upgrade - they seem very cheap...?

Thanks

Phil

If I were you I'd go with either the 750Kv or the 800Kv. I've found it's better to go with lower numbers than to risk numbers too high. With the 750kv I can lift crazy weight and the motors are ice cold no matter how I fly and my flight times are 12-15 minutes with them and were 8-10 minutes with the 1350's. The 800Kv looks perfect according to the specs and will spin huge blades, maybe 14" or so depending on pitch.

The Turnigy NTM motors seem ok. They are cheap for sure and I have never had a single one fail on me for reasons other than I did something to it, like crash for example. I hear people say that they rewind them and put in fresh bearings but I've never done any of that and I'd not buy them if I had to do that anyway lol. I'm open to motor suggestions but these seem to work great for me. I have 12 hours of logged flight time on them to give you an example, see my YouTube channel.

 

[gtranquilla]

I am using the NTM 35-30 1100kv 380 watt motor with the 10 inch 5 pitch Graupner props with great success but don't forget to also purchase the prop adaptors. This modified F550 has a modified 468 landing gear and 2 axis gimbal for my GoPro3. And I power this system with parallel 3S 5000 maH batteries. You can also power this system with 4S batteries according to ecalc but some caution is advised. I think it is best to fly in this mode in hover mode for a few minutes before opening the throttle towards 100% or remain with the restricted 6 m/s climb rate limit as defined by attitude and GPS modes.

Another way you might want to go is to buy the RC Timer 800 airframe and add the following 22 pole motors... http://www.hobbyking.com/hobbyking/..._4822_690Kv_22Pole_Multi_Rotor_Outrunner.html
then swing some larger prop sizes. This brings it closer to the S800 category. But don't expect the S800 landing gear to directly mount to the RCT800 airframe arms.
I haven't tested this design yet as I am still awaiting for some of the parts to arrive etc.

Since this type of custom modification circumvents the typical RTF or ARTF multi-discipline engineering design approach..... due dilligence and the use of eCalc seem essential from my perspective.

I've been following this thread with interest as I may have to upgrade the motors on my 550.
It currently weighs 2330g with standard dji motors, esc's, aeroxcraft landing gear, gimbal etc but I would like to upgrade the gimbal, which would push the auw up to about 2600g.
I would like to keep the Graupner 10x5 props and my 5000mah 3S lipos so which motors should I consider - the 800kv or 1000kv? Are the Turnigys a good upgrade - they seem very cheap...?

Thanks

Phil

 

[gtranquilla]

Yes....I take Kloner's advice very seriously..... he is very good at this.

First of all, thanks for your help and I truly appreciate it. I won't use extenders because it will no longer fit in my travel case if I do and I'd have to remove them and that's a huge pain. I swapped back to the 750Kv motors and they are a dream to fly compared to the old ones. It's interesting that you say that the stock motors are 920kv and 120W as these are 750Kv and 250W. I can pull a maximum of about 90A through these motors with this prop setup and I can do that all day long with ZERO heat, the motor cans are like ice cubes from the air temp when I'm done flying versus the 1350's which were warm to the touch along with the ESCs. If I went above 3kg I'd go with a deeper pitch prop and I'd be willing to be it would be problem solved, 10"x5 to 10"x7 for example) so I really like this nice torquey motors now that I've flow on the faster versions. I was able to get eCalc to work just now, I looked at your screen and I think the issue was some of the numbers were already added and included in some of the other steps. I changed it to without total drive weight and it came up just about correct. Thanks!


EDIT : One more thing, Kloner was right...the 1350Kv's are way too fast, the 750Kv's are great and I am now also starting to think that the 1000's are too much. Kloner also recommended going up to the 800Kv if I wanted an upgrade and in the eCalc they look like a perfect fit so +1 to Kloner, I'm getting tired of admitting he's right though lol...call me hard headed but I'll learn...