1100mm hex build. Hexacrafter, T-Motor, A2. Oh my.

Pumpkinguy

Pumpkinguy

Member
12.5 kg load test was absolutely perfect. 14.5kg I did a 5 minute hover and I was not happy with the results. Motors ran too hot. Well within proper operating temps but to hot for my liking and only after 5 minutes. Kde claims 3kg thrust out if these motors. I feel that's a stretch. I will be switching to u7's which are proven in the field to do 3kg all day long.
 






Bartman

Bartman

Welcome to MultiRotorForums.com!!
Pumpkinguy said:
12.5 kg load test was absolutely perfect. 14.5kg I did a 5 minute hover and I was not happy with the results. Motors ran too hot. Well within proper operating temps but to hot for my liking and only after 5 minutes. Kde claims 3kg thrust out if these motors. I feel that's a stretch. I will be switching to u7's which are proven in the field to do 3kg all day long.
Click to expand...

pumpkinguy, you're saying 3KG per motor for an all up weight of 18kg or just under 40 pounds?
 

econfly

econfly

Member
I'm in the early thinking stages of a build to haul an M5 so this is very relevant to me.

The KDE 4215XF-465 motors look great on paper, but reading your build results here I wonder if I would be better off with T-Motor U7s. Thinking of an X8 build, eventually. Or I may just punt it and buy an ALTA...

Anyway, from the specs, the 4215XF motors have amazing efficiency. I'm thinking the build I want would be around 12kg all up. So, a little over 1.5 kg/motor. With X8 efficiency losses and real world flying it looks like these 4215 motors with 15 x 5 folders would only be pulling 10-15A at 6s and never be even close to full throttle.

So what was your real world view on these? Looks like you were hauling the same weight I'm thinking of, give or take, but on a hex. Were you running 16 inch props? KDE's specs claim you could haul your weight with these motors and not even pull 20A per motor.

Seems like you found the specs to be optimistic (or just wrong). If you don't mind I would love to know the details of current demand, etc.
 



Pumpkinguy

Pumpkinguy

Member
econfly said:
I'm in the early thinking stages of a build to haul an M5 so this is very relevant to me.

The KDE 4215XF-465 motors look great on paper, but reading your build results here I wonder if I would be better off with T-Motor U7s. Thinking of an X8 build, eventually. Or I may just punt it and buy an ALTA...

Anyway, from the specs, the 4215XF motors have amazing efficiency. I'm thinking the build I want would be around 12kg all up. So, a little over 1.5 kg/motor. With X8 efficiency losses and real world flying it looks like these 4215 motors with 15 x 5 folders would only be pulling 10-15A at 6s and never be even close to full throttle.

So what was your real world view on these? Looks like you were hauling the same weight I'm thinking of, give or take, but on a hex. Were you running 16 inch props? KDE's specs claim you could haul your weight with these motors and not even pull 20A per motor.

Seems like you found the specs to be optimistic (or just wrong). If you don't mind I would love to know the details of current demand, etc.
Click to expand...

If you are doing a 12kg rig in either hex or x8, these are the perfect motor for you with a 16" prop. If you don't have a frame yet id really like to steer you towards Hexacrafter. Great value and I can assure you the after sales service will be unbeatable.

My rig was designed to carry a dslr with the option of carrying a heavier camera if the need was there. I want to be able to say "yes, we can fly a red".

These motors are known for running hot but being a "Bearing Specialist" for 20 years I am concerned about them running warmer than I like. Others say they can easily run 200-220f no problem. Mine never got above 140 but it still stresses me even know I'm running them way below the suggested capacity.
I think the U7's or the 5215's would have been a better choice.
The u7's have their own issues with esc's running crazy hot but I have a plan to deal with that.
 

Pumpkinguy

Pumpkinguy

Member
I'm on holidays for 2 weeks but what I will do when I get home is try 17" props. I didn't have any at the time of load testing.
 

Pumpkinguy

Pumpkinguy

Member
On another note related to this build, I still haven't picked a gimbal. So many choices and nab just made the decision harder. This will be my main camera. Gh4 with veydra prime. This is the 16mm version. I am considering the 12 as well. A beautiful piece of glass. Cheers. View attachment 24410
 

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Pumpkinguy

Pumpkinguy

Member
I haven't updated this build in a while. After load testing the KDE 4215-465's I decided to switch my power train over to tmotor. The 4215's are a great motor for a 12-13kg AUW Hex IMO but pushing them to the limits as per their engineering data of 18kg was not giving me that warm and fuzzy feeling.
So I had to order new motor mounts, tmotor U7-490's and T80A esc's. This is a tried and true setup. There are hundreds of pro rigs out there using these very successfully. This is the setup I should have used from the start but I stubborn. I do hear the esc's run a little hot so I added some heat sinks that greatly increases the surface area.

I cut away shrink wrap around the heat sink portion of the esc then pried up the aluminum plate with my finger nail.
I rolled back the stock puddy then roughed up the underside for adhesive to adhere. I then applied some thermally conductive epoxy to the 3 brass colored plates and replaced the stock heat sink and clamped overnight.

The aftermarket 1" x 2" x 3/8" heat sinks had their own psa adhesive.


New mounts and motors

Just waiting on bullets to do a throttle calibration and then will do her maiden.

View attachment 24883 View attachment 24884 View attachment 24885 View attachment 24886 View attachment 24887 View attachment 24888
 

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Pumpkinguy

Pumpkinguy

Member
I should add that I was "wowed" by the quality of the machining on the U7's. I know we are talking about cosmetics here but I honestly never expected them to look so good. I expected kde to be heads and tails above them in fit and finish. I couldn't have been more wrong.
 

jfro

jfro

Aerial Fun
You have more guts than I. Sounds like you are talking upwards of 39 lbs on a hex. Are you still pondering your on what gimbal to go with?
 

Pumpkinguy

Pumpkinguy

Member
In reality it will be 12 kg most of the time. But I wanted to be able to fly 15-16kg max if necessary.

I think the h16.
 




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