Marmod --- Lownoise Mod for the Marmotte DJI / Karearea 2207 Bi-Turbine
By MamaJOE on Apr 25, 2022
The story behind the build
This bulid evolved from my BITON build (https://rotorbuilds.com/build/28643).
This build was great, but I still had problems with uncommanded movments.
And as an engineer I just had to make it work...that's it.
Choice of components
The components are the same as in the Biton build, I just added some reinforcements to get rid of the vibrations and a GPS.
My idea was to strengten the arms to reduce the flex an therefore the shaking on the roll axis.
So I watched out for some suitable components and found the replacement arms for the Badger.
These should fit more or less to the arms of the Marmotte. I just took the 6" version to have a bit more length to fix them.
To fix the arms the centerplate of the Rooster seemed to be worth a try.
Building
This build was really great fun, because it was a lot work to customize all the carbon parts and make them fit together.
I did a lot of testing and modifications untill I was satisfied with the result.
Flight quality
I tried to remove as much as possible noise from this build.
So I reinforced the frame, supported the Immortal-T antenna with spring steel wires, used a Mamba interference shielding, added 2000 µF of low ESR capacitance, moved the battery under the quad to fix it to the fat Rooster centerplate, tuned the bearing play of the motors...and at the end it worked!
Ok, the downside is that it's more a tank than a flying machine - but it's incredible lownoise now and flies really great.
I'm able to turn off the dynamic notch filter and still push the PIDs. The bigger mass gives the quad some kind of "solid" flightfeel and I love it.
The only real downside is the reduced flighttime, because this battleship is at battery drainer.
Data
Weight with props: 525 g
AUW with 6S 1050 mAh: 705 g
AUW with 6S 1400 mAh: 751 g
Flight time (1400 mAh): approx. 3:00 to 6:00
v_max: 185 km/h (straight flight, with constant altitude)
Photos
Part List
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Do you know Chris Rosser's analysis of the Marmotte frame? If not see my BITON build. Perhaps it will help to fix the battery under the quad?
Reinforcing the arms should work. But you should fix the reinforcement somehow in the middle of the frame.