evecopter not working | Kerbal Space Center | Page 1

steel ledge Jun 11, 2023, 9:35 PM

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my eve lander is not seeming to want to fly in a straight line, whenever i reach a certain altitude or attempt to maneuver at all the vehicle spins out of control in all axes and cannot be recovered

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this is the vehicle, it has a few reaction wheels and in previous designs this led to at least some flyability, now this is no longer the ase and it cannot be flown

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also the props are contrarotating and sas is enabled, the KAL is set so that they generate the same amount of thrust and they are within 3mm of being perfectly aligned with one another along the global-z axis

brittle yew Jun 12, 2023, 5:28 PM

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For a helicopter, you need stabilizers, and bring the rotors a little back. A rotor acts as a circular wing during translation flight, having the overall CoL ahead, at 25% of the chord of the circle, this is, ahead of your CoM, and it becomes unstable, trying to pitch up. Don't move the rotors too far back, or hovering will be tricky/not possible. During translation flight, the horizontal stabilizers need to provide lift on the tail, to compensate for the lift of the rotors moving forward, try different angles. Use a vertical stabilizer for directional stability, and make sure you yaw only with reaction wheels, not the rotors (your blades are not articulated).

steel ledge Jun 12, 2023, 10:54 PM

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i have enabled pitch yaw and roll control for the blades, and their collective is bound to a kal controller in the same fashion of this video, i did everything according to it
https://www.youtube.com/watch?v=smtQ_lBJhTA

i will rebalance the center of mass

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one of my main issues is that the rotors are just flopping around and autostrut doesnt work

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also when i turn on SAS it shakes so violently that it explodes, the rotors flying off despite having autostrut turned on with any setting

brittle yew Jun 13, 2023, 10:23 AM

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If you have control (specially yaw) with the rotor blades, make sure the rotors have enough clearance. When yawing left, your lower rotor blades will want to rise more than the upper roror blades will (and I'd recommend you to let them all go).

Why don't you make a small, light craft and fly it around to see how it goes, where the weakpoints are, and how it handles with and without reaction wheels, and SAS?

burnt wyvern Jun 13, 2023, 4:59 PM

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steel ledge also when i turn on SAS it shakes so violently that it explodes, the rotors flyi...

Turn off cyclic control on the prop blades

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Just use collective

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ksp doesn't like cyclic control

steel ledge Jun 13, 2023, 9:43 PM

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thank you two for advice i will try when ksp

brittle yew Jun 14, 2023, 6:47 AM

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🙂

steel ledge Jun 14, 2023, 5:57 PM

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the evecopter is based on this wonderful design by jamie logan
https://youtu.be/4vuZ9gnJ9sQ?t=265

brittle yew Jun 14, 2023, 9:04 PM

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Watching the video, I'd say that helicopter never leaved hover mode. Translation mode is tricky.

steel ledge Jun 16, 2023, 5:16 AM

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i can easily put detachable stabilizers and whatnot onto it, those are not an issue and i have enough delta-v to put on one reaction wheel of the largest size but no more

steel ledge Jun 23, 2023, 7:34 PM

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i dont get it why is this mostly stable yet the evecopter completely dysfunctional

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it is also extraordinarily fast at 51m/s vertical speed

steel ledge Jun 23, 2023, 8:09 PM

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also i rebalanced the centre of mass of the evecopter so that it is slightly in front of the centre of lift but now it rocks violently along the pitch axis but refuses to yaw at all

#evecopter not working