Auto take off settings for catapult- please help

hi guysI'm launching a x8 off a strong catapult and am having trouble with the throttle delay and MINACC parameters. I have done about 10 launches in auto mode without the prop on and have been monitoring when the motor spools up. It is usually way too late and the x8 has already glided down to the ground. Do I need to change MINACC down to 2/3 and the. Play around with throttle delay or keep MINACC at 5 and disable the throttle delay (Tkf_thrt_delay)completely. I do not have the depth on the catapult trolley to start the motor prior to launch, I want the throttle to kick in just as it is clear of the catapult. Can anyone help me with some ideas or a good starting point as it just seems to be getting worse and worseThanks in advance.X8 5kg mtow710kv scorpion20000mah14x8 folding prop

You need to be a member of diydrones to add comments!

Join diydrones

Email me when people reply –

Replies

            • This could be dangerous if you ever fly in wind, you could easily see a 4m/s or greater headwind while the aircraft is stationary.

            • Thanks Jacko 

              I am not using a buggy launch but a catapult - the settings are completely different and takes some playing around with . Bungee launch is nice if you have the space and time to setup

  • Moderator

    Hi Patrick

    We make powerful catapults for the X8 and other aircraft, The problem you have is time. 

    The motor takes at least 1.5-2 seconds to reach full speed and power from the application of full throttle, our catapults make the trip from start to finish in about 0-9 seconds and so your motor will only kick in after the X8 has left the launcher ? by the time the motor is producing useful power you have landed. 

    We make this work by building the cradle so the propeller can run during the launch, we launch in stabilise and run the motor to about 60% throttle so the aircraft does not move then hit the catapult trigger and full throttle at the same time. it takes a little practice but gives great launches. When you are at a safe height switch to auto.

    www.air-vision-air.com 

     

    Home
    UAV\'s for photos and mapping
    • HI DWG

      Thanks for that, I do not want to have to use any power before the launch (And have seen it on a number of systems) - the catapult launch without power is pushing the X8 to about 11m or 4-5 seconds so I am hopeful that with the right timing, we can get the motor to kick in right at the end of the rail and there will be sufficient time to get to full power. 

      I have seen your catapults and they look great but on this occasion we already have a catapult so I am trying to see what we can do to get this one working without having to use any power during the launch - appreciate any help you can offer in terms of params and settings 

This reply was deleted.

Activity

DIY Robocars via Twitter
How to use the new @donkey_car graphical UI to edit driving data for better training https://www.youtube.com/watch?v=J5-zHNeNebQ
Monday
DIY Robocars via Twitter
RT @SmallpixelCar: Wrote a program to find the light positions at @circuitlaunch. Here is the hypothesis of the light locations updating ba…
Saturday
DIY Robocars via Twitter
RT @SmallpixelCar: Broke my @HokuyoUsa Lidar today. Luckily the non-cone localization, based on @a1k0n LightSLAM idea, works. It will help…
Thursday
DIY Robocars via Twitter
@gclue_akira CC @NVIDIAEmbedded
Nov 23
DIY Robocars via Twitter
RT @luxonis: OAK-D PoE Autonomous Vehicle (Courtesy of zonyl in our Discord: https://discord.gg/EPsZHkg9Nx) https://t.co/PNDewvJdrb
Nov 23
DIY Robocars via Twitter
RT @f1tenth: It is getting dark and rainy on the F1TENTH racetrack in the @LGSVLSimulator. Testing out the new flood lights for the racetra…
Nov 23
DIY Robocars via Twitter
RT @JoeSpeeds: Live Now! Alex of @IndyAChallenge winning @TU_Muenchen team talking about their racing strategy and open source @OpenRobotic…
Nov 20
DIY Robocars via Twitter
RT @DAVGtech: Live NOW! Alexander Wischnewski of Indy Autonomous Challenge winning TUM team talking racing @diyrobocars @Heavy02011 @Ottawa…
Nov 20
DIY Robocars via Twitter
Incredible training performance with Donkeycar https://www.youtube.com/watch?v=9yy7ASttw04
Nov 9
DIY Robocars via Twitter
RT @JoeSpeeds: Sat Nov 6 Virtual DonkeyCar (and other cars, too) Race. So bring any car? @diyrobocars @IndyAChallenge https://t.co/nZQTff5…
Oct 31
DIY Robocars via Twitter
RT @JoeSpeeds: @chr1sa awesomely scary to see in person as our $1M robot almost clipped the walls as it spun at 140mph. But it was also awe…
Oct 29
DIY Robocars via Twitter
RT @chr1sa: Hey, @a1k0n's amazing "localize by the ceiling lights" @diyrobocars made @hackaday! It's consistently been the fastest in our…
Oct 25
DIY Robocars via Twitter
RT @IMS: It’s only fitting that @BostonDynamics Spot is waving the green flag for today’s @IndyAChallenge! Watch LIVE 👉 https://t.co/NtKnO…
Oct 23
DIY Robocars via Twitter
RT @IndyAChallenge: Congratulations to @TU_Muenchen the winners of the historic @IndyAChallenge and $1M. The first autonomous racecar comp…
Oct 23
DIY Robocars via Twitter
RT @JoeSpeeds: 🏎@TU_Muenchen #ROS 2 @EclipseCyclone #DDS #Zenoh 137mph. Saturday 10am EDT @IndyAChallenge @Twitch http://indyautonomouschallenge.com/stream
Oct 23
DIY Robocars via Twitter
RT @DAVGtech: Another incident: https://t.co/G1pTxQug6B
Oct 23
More…