I think the very best battery setup could be the Multistar 4000mah LIPO and overpacked to 4.35V. The LIPO is much lighter than the the LiHV, saving more than 40grams between the 2 batteries. With the overpacking, you'll get the extra push on the top end of the battery and still have that extra on the bottom end. That would be the perfect setup for you as you fly the batteries so low. @dirtybum has had good results overpacking his Multistar lipos (I think he has Multistar).
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I think the very best battery setup could be the Multistar 4000mah LIPO and overpacked to 4.35V. The LIPO is much lighter than the the LiHV, saving more than 40grams between the 2 batteries. With the overpacking, you'll get the extra push on the top end of the battery and still have that extra on the bottom end. That would be the perfect setup for you as you fly the batteries so low. @dirtybum has had good results overpacking his Multistar lipos (I think he has Multistar).
digdat0
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**** Nate! That's a huge run man, congrats .. pr, world record and just an amazing flight. Your signal looks like it held up well, without those winds ya got 50k easily. Nice!!
Thank you Dig! Yes, I had excellent signal today. I think one of my amps might be stronger than the other. I swapped them. I'll keep them in this configuration. No issues with signal. Could have gone several miles more battery permitting.
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dirtybum
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Nice flight Nate,congrats!
it's going to be hard to beat a record that used 8000 extra MAH.
usually when you run a deficit , a.k.a. you was at 49,000 and turned around at 48%, it takes 34 1/2+ mph to make up the deficit(usually)on the phantom series at least)
did you use any sports mode on this run to increase the speed a little?
it's going to be hard to beat a record that used 8000 extra MAH.
usually when you run a deficit , a.k.a. you was at 49,000 and turned around at 48%, it takes 34 1/2+ mph to make up the deficit(usually)on the phantom series at least)
did you use any sports mode on this run to increase the speed a little?
Yes, I run sport mode all the way home and modulate the throttle to keep between 60 and 80% thrust per tachometer. I usually have a tail wind coming back. I ran 40mph most of the way except for a couple spots where I slowed to 32 and 37. Last mile was in landing mode and my bird goes close to 29 in landing mode unlike Unknown Caller who only gets 22.
dirtybum
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@CyberNate,
@unknowncaller, or any others that have hit critical landing trying to make it home, have you noticed or had any problems using yaw while fighting the stick to keep elevation. two times in a row I've hit critical where I would've landed with 4% battery on some record stock runs, and when I barely touch the stick to yaw while holding up for elevation, it overreacts, and then if you try to correct it, it overreacts the other way and it's just uncontrollable at that point. it's really made me lose confidence in cruising a mile on critical landing, or hitting critical landing at all, this is a skill I usually have no problem with at all and have landed in critical mode 2-300 times
@unknowncaller, or any others that have hit critical landing trying to make it home, have you noticed or had any problems using yaw while fighting the stick to keep elevation. two times in a row I've hit critical where I would've landed with 4% battery on some record stock runs, and when I barely touch the stick to yaw while holding up for elevation, it overreacts, and then if you try to correct it, it overreacts the other way and it's just uncontrollable at that point. it's really made me lose confidence in cruising a mile on critical landing, or hitting critical landing at all, this is a skill I usually have no problem with at all and have landed in critical mode 2-300 times
@CyberNate,
@unknowncaller, or any others that have hit critical landing trying to make it home, have you noticed or had any problems using yaw while fighting the stick to keep elevation. two times in a row I've hit critical where I would've landed with 4% battery on some record stock runs, and when I barely touch the stick to yaw while holding up for elevation, it overreacts, and then if you try to correct it, it overreacts the other way and it's just uncontrollable at that point. it's really made me lose confidence in cruising a mile on critical landing, or hitting critical landing at all, this is a skill I usually have no problem with at all and have landed in critical mode 2-300 times
Are you running sport mode? Switch to P-mode which has reduced rates. You don't gain anything in sport mode once landing mode starts. Additionally, I think you have compass issues. You mentioned previously about losing GPS lock. This can happen if compass is off. Get that compass calibrated in a good location, like over some grass.
If you're going to come out this way, be sure and get in touch first. There are some spectacular spots along the beach/cliffs in Santa Cruz that are a treasure to film. I'll try and post a small clip up later today -- working on a Litchi project at the moment.
@CyberNate,
@unknowncaller, or any others that have hit critical landing trying to make it home, have you noticed or had any problems using yaw while fighting the stick to keep elevation. two times in a row I've hit critical where I would've landed with 4% battery on some record stock runs, and when I barely touch the stick to yaw while holding up for elevation, it overreacts, and then if you try to correct it, it overreacts the other way and it's just uncontrollable at that point. it's really made me lose confidence in cruising a mile on critical landing, or hitting critical landing at all, this is a skill I usually have no problem with at all and have landed in critical mode 2-300 times
I should add, my bird is rock solid stable in landing mode. I've had 3 different mavics. On a previous one I did have some issues with yaw. I did an IMU calibration and it was much better.
Will do! I don't get out too much these days on the weekend. I have 3 kids and the significant other gives me dirty looks when I come up with these ideas of heading out to the coast for dad time.
dirtybum
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I may not of posted here but I talk to many pilots in private, so you may not of known, I solved the Compass/flying issues. have flown a half a dozen 20+ thousand flights with no issue in regards to that!
while I will agree that the yaw is very sensitive when you're in sport mode, all of that is out the window once it hits landing mode, complete different parameters complete different mode now. The first image you see where it really overreacted, and some of that was pilot error because it over corrected when I try to straighten it out, it seems like it's very sensitive to yaw, while holding the stick up for altitude in critical land. Can you confirm that you have tried to yaw under 9% while holding the stick up for altitude in landing mode and you was able to do it smoothly with no problems? keep in mind this is a new issue to me, but flying for over a mile on zero battery is not, I'm used to playing it cool under pressure.
there's only a handful of pilots that have tried to make it home on critical land with this AC, can any of you confirm that you tried to yaw while holding the stick up for altitude and had no problems
@CyberNate et al: What is the most efficient nominal speed to fly? I know people often measure speed vs. flight time, but what we want in terms of efficiency is speed vs. total distance, which may not be the same.
By nominal I mean under windless conditions.
I saw something posted (don't remember where) showing the speed vs. current draw curves, and they were pretty flat from about 25-30mph to 40. This implies the run time at 30mph is about the same as 40mph, which means the most efficient speed/distance speed is full throttle.
However, I really don't know. Just putting disparate pieces of information together to try and get an idea.
By nominal I mean under windless conditions.
I saw something posted (don't remember where) showing the speed vs. current draw curves, and they were pretty flat from about 25-30mph to 40. This implies the run time at 30mph is about the same as 40mph, which means the most efficient speed/distance speed is full throttle.
However, I really don't know. Just putting disparate pieces of information together to try and get an idea.
Maybe we need to organize a meet in Santa Cruz and then you have an excuse, official event and all, you know?
I've never had any issues with my new bird regarding yaw and landing mode. Flies perfectly. I often come in with forced landing mode.
There are many variables in play. It depends on wind speed and direction as well as how much weight you are carrying. Running P-mode with obstacle avoidance off gives you around 32mph which is a good speed for slight headwind. In general your air speed should be close to 32. If you have a 7 mph tail wind, then 39-40mph is optimal which is 32-33 mph air speed. I fly in sport mode when there is a tail wind and I keep the tachometer under 80%. Keep in mind that this is with 600 grams of extra batteries and battery mod. Without the extra weight, you should keep thrust down below 60%.
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Sounds like a job for fixed-wing mode, to avoid stick-fatigue. Have you ever tried that?
Perhaps you are not as comfortable with the Mavic controller. I know the Mavic controller gimbals are junk compared to the phantom controllers. There is a lot less sensitivity. You basically need to barely move them to adjust yaw. If you move it as you would on Phantom controller you'll get way too much response. The response curve is poor on Mavic.
By the way, if you guys want to go through my data at all, just let me know. I can upload the flight log and DAT file. I don't mind sharing if you can get some good ideas from them. There are some nice DAT parsing tools available as many of you know that give very detailed information, like individual motor speeds, battery details to the .1 second interval, signal errors, my input adjustments and thrust levels, etc.
junyong
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Sorry if this has already been discussed but has anyone thought about adding some small airfoils? I'm envisioning something mounted to the top or wide at the sides at the appropriate attack angle at speed to help with lift. Would that be cheating? At 30 mph a properly designed and placed "fixed wing" would have quite an effect if it doesn't disturb the airflow to the props too much.
At any rate, I think what you guys are doing, finding ways to push this thing to its absolute limits, is awesome. The discussion sometimes sounds a lot like sending an aircraft into space
At any rate, I think what you guys are doing, finding ways to push this thing to its absolute limits, is awesome. The discussion sometimes sounds a lot like sending an aircraft into space
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