asdf
- Thread starter f91ddr
- Start date
I think I would go with the 1000mAh myself, 1300 seems huge for a 3". How is your flight time on 3S?
PsyBorg
Wake up! Time to fly!
I would go with an 800 - 1000 mah max size battery and would probably drop down to 3x3x3 props to start. I think if you drop down to 800 mah 3s with higher c rating you will notice a nice enough difference to not need to jump to 4s and retuning and changing props and all that.
Also going to tri blades will help a lot as well. 4 blades is a lot of weight to turn on high kv motors.
Also going to tri blades will help a lot as well. 4 blades is a lot of weight to turn on high kv motors.
PsyBorg
Wake up! Time to fly!
Sorry that was a typo. That should have been 3x4x3 on the smaller battery. I will bet you see a better result going back to the 3x3.5x3 now that you have the quad tuned so the motors are getting into their power band more. Should be similar or slight drop in power with longer flight times as the motors wont be sucking up as much amps to turn the weight.
I just had a look at the spec sheet for them motors. The 3x4x3 props on 4s give the most bang for the buck according to their spec sheet. That gives 340 g thrust with an efficiency of 2 g per watt.
The 3x3x4 props you are using on 4s give only 315 g thrust with 1.77 g per watt. Using the same props on 3s brings the efficiency up to 2.34 g per watt. So you are actually already on the best set up for the quad for power to weight. You have a thrust total of 242 g x 4 for 968 g IF all conditions are perfect.
So if you stick with motor / prop combo you use now and drop the battery weight you will get a nice improvement as the actual current draw will go down. This will bring the flight time per mah up as well. If you go smaller prop bigger pitch you will also get an improvement as the 3x4x3 props put out at 2.35 g per watts. Your power to weight drops but you get better real usable g per watt. At 182 g x 4 is only 728 total that is still more then enough to move the quad nicely and give good flight times. You will stay higher up in the rpm band but it will be producing more usable thrust. Thus dropping battery weight will bring the flight time per mah up as well.
Sluggish in FPV confuses me.. do you mean over all speed in the goggles looks slow or the reaction of the quad seems slow? If its reaction that seems slow then its your tune. Which could also be the lack of flight time you think you should have. If it is perceived speed in FPV that could be because you are used to sims with wide angle FOV and are now flying in 4:3 with smaller FOV.
Kids flying sims are flying 25 degree camera tilt and 35-50 speed settings with 100 degree FOV and look like they are cruising fast in videos. I fly 55 degree tilt and 85 speed settings with 50 degree fov and I look like I am going slow in a sim but in reality I am doing way faster.
I just had a look at the spec sheet for them motors. The 3x4x3 props on 4s give the most bang for the buck according to their spec sheet. That gives 340 g thrust with an efficiency of 2 g per watt.
The 3x3x4 props you are using on 4s give only 315 g thrust with 1.77 g per watt. Using the same props on 3s brings the efficiency up to 2.34 g per watt. So you are actually already on the best set up for the quad for power to weight. You have a thrust total of 242 g x 4 for 968 g IF all conditions are perfect.
So if you stick with motor / prop combo you use now and drop the battery weight you will get a nice improvement as the actual current draw will go down. This will bring the flight time per mah up as well. If you go smaller prop bigger pitch you will also get an improvement as the 3x4x3 props put out at 2.35 g per watts. Your power to weight drops but you get better real usable g per watt. At 182 g x 4 is only 728 total that is still more then enough to move the quad nicely and give good flight times. You will stay higher up in the rpm band but it will be producing more usable thrust. Thus dropping battery weight will bring the flight time per mah up as well.
Sluggish in FPV confuses me.. do you mean over all speed in the goggles looks slow or the reaction of the quad seems slow? If its reaction that seems slow then its your tune. Which could also be the lack of flight time you think you should have. If it is perceived speed in FPV that could be because you are used to sims with wide angle FOV and are now flying in 4:3 with smaller FOV.
Kids flying sims are flying 25 degree camera tilt and 35-50 speed settings with 100 degree FOV and look like they are cruising fast in videos. I fly 55 degree tilt and 85 speed settings with 50 degree fov and I look like I am going slow in a sim but in reality I am doing way faster.
PsyBorg
Wake up! Time to fly!
Recovering from a loop and having to hit the throttle harder is the same thing I deal with on my Gremlin. Too much weight. You either have to drop weight most likely at the battery as thats the largest contributor. Or change the throttle center like I have to compensate for the muscle memory I have built flying more powerful quads so I physically place the stick in the same way I do on the big ones but the power out put in the quad is a bit higher.
Changing prop size and pitch will change power and efficiency but not where the "power band" is for the quad when weight and inertia are being factored in. All those numbers are from static testing under specific conditions.
Changing prop size and pitch will change power and efficiency but not where the "power band" is for the quad when weight and inertia are being factored in. All those numbers are from static testing under specific conditions.
ItMightFly
Active member
Completely understandable! I couldn't stop laughing though. Glad you have figured most of it out. Hope to see final results!
