Comment by OlivierD. on February 2, 2013 at 10:00am

Great setup Tim, seems like a good way to get some practice. What does the copter do when it reaches the end of the string, does it jerk and self-right immediately? I am worried it might freak out and crash no? Perhaps a piece of rubber band at the end of the string to dampen the shock when you hit the end of the rope? 

Very impressed with the 20 min. flight time, that is amazing. Question: What do you use the BEC output for? 

Regards,

Comment by Tim Green on February 2, 2013 at 10:25am

OliverD, copter stays level when it reaches the end of the string. Motors rev up a bit, as it pulls on the string - nothing more than that. I've done 5 full flights this way to date. I'd be very hesitant about adding elastic energy to this setup.

I use the BEC to power the output rails of the APM. As DJI ESCs are opto, and have no BEC on them to use for that.

Comment by Neil Ohnemus on February 2, 2013 at 10:36am

Nice Tim, you have inspired me.

I have some work to do getting my hex setup in the basement today!

Developer Comment by jasonshort on February 2, 2013 at 11:22am

4.5 is a good setting for this quad.

I would suggest tuning it on the string if you can. Most likely the rate_D is a little low and Rate P might not be exactly right. 

I usually do a quick roll and level it to look for wobble, then adjust rate_P and raise rate_D until I tune it out.

Jason

Comment by Michael on February 2, 2013 at 11:30am

Thanks for the idea! Probably eliminated a crash or fly away for me outside while tuning!

Comment by Tim Green on February 2, 2013 at 11:37am

Be sure that your tether is strong enough for your machine, also short enough not to allow props to strike anything in basement other than the floor, and finally, and heavy enough that slack string lays on floor rather than getting blown up into props.

Comment by Tim Green on February 2, 2013 at 11:38am

And start with a short tether if you've never fired up your props before.

Comment by C. Escudero on February 2, 2013 at 12:26pm

what motors and props are you using? I am buying the same frame. thank you

Comment by Tim Green on February 2, 2013 at 1:13pm

Stock DJI 920kv motors, 30A ESCs and 10" props.

Comment by OlivierD. on February 3, 2013 at 2:04pm

Cool! Great idea. I am building two separate quads and was wondering how I would tune them without breaking 20 props, scratching the furniture and risking all sorts of damage, this is a great way to check that the settings are good enough prior to heading out for good. Excellent work Tim!

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