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Old Aug 01, 2012, 09:31 PM
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Sooooo I weighed my plane and its LOL 6.56 lbs. how much do your guys plane weigh?
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Old Aug 01, 2012, 09:45 PM
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LOL. Mine is 3.9 lbs with Gopro, all FPV equipment, and will fly for over 45 minutes on a single 3s 5000mAh pack. Im still trying to figure out why people load these planes down with batteries. The law of diminishing returns is a b!tch; you load em down with excessive mAh, and it requires more amps to climb and cruise than the same plane with a single pack. A 3s 5000 20c is the way to go with the Skywalker. Lighter is better.

On a 3s 5000 and a rimfire 35-36 1200 (9x6 apc prop) I regularly climb over 6500 feet and just hang out up there in cruise. Loose the extra pack, Im begging you!
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Old Aug 01, 2012, 09:46 PM
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Gonna have to experiment with the one 5000 vs the 5000+ the 4000 then.
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Old Aug 01, 2012, 09:47 PM
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Originally Posted by snelan View Post
So I am about to build my 1900mm "improved lift" SW from BEV And was just curious as to what kind of flight times I might get. I know it's kind of a crap shoot, but I'll be flying with a 5000mah + 4000mah together, so a 9000mah 3 cell, with a SK3 3536 1200kv motor spinning a 10x4.7 prop. Any estimates?
see the above post...
Ive been flying mine for over a year and they really shine if you keep the weight down.

Heres the SW doing some light aerobatics
Skywalker FPV Aerobatics (4 min 10 sec)
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Old Aug 01, 2012, 10:03 PM
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and if you keep it light, you can slow it down too
Blue FPV Christmas (1 min 26 sec)
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Old Aug 01, 2012, 10:45 PM
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Quote:
Originally Posted by webdr View Post
LOL. Mine is 3.9 lbs with Gopro, all FPV equipment, and will fly for over 45 minutes on a single 3s 5000mAh pack. Im still trying to figure out why people load these planes down with batteries. The law of diminishing returns is a b!tch; you load em down with excessive mAh, and it requires more amps to climb and cruise than the same plane with a single pack. A 3s 5000 20c is the way to go with the Skywalker. Lighter is better.

On a 3s 5000 and a rimfire 35-36 1200 (9x6 apc prop) I regularly climb over 6500 feet and just hang out up there in cruise. Loose the extra pack, Im begging you!
I've followed the same principle with my other planes too. I get 90 minutes of flight time with a 2200mah on my EZ Star. That includes thermalling, of course.

Do you use a separate battery for video or is that powered off the 5000?

Thanks

Cliff
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Old Aug 01, 2012, 11:19 PM
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Quote:
Originally Posted by cliffkot View Post

Do you use a separate battery for video or is that powered off the 5000?

Thanks

Cliff
I'm going to be using a separate 850 3s for the video equipment.

EDIT: I found that on previous planes, the video is effected by current draw from the motor revving if I have it on the same battery. Getting maybe a 40c or so may help this, but it's cheaper just to pay for a separate video tx/rx battery. I think I got a few 850 3 cells for like $8 a piece off HK.
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Old Aug 02, 2012, 04:55 AM
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Finally got my skywalker

Still waiting on my hitec servos and 4s 5000mah lipos....does anyone want me to keep posting pics etc for my build or not?
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Old Aug 02, 2012, 05:07 AM
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Originally Posted by GazaChinee View Post
Still waiting on my hitec servos and 4s 5000mah lipos....does anyone want me to keep posting pics etc for my build or not?
Yes please, that would be cool!!

BTW, what do you guys think it is better, 4S or 3S type batteries for this 1900 Wing plane?

I ask this because I am hesitating about what scorpion motor to buy, something like 1200kV for a 3S battery or a 900-1000kv version for a 4S.

thanks!
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Old Aug 02, 2012, 05:10 AM
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yes please , definately
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Old Aug 02, 2012, 06:16 AM
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Quote:
Originally Posted by snelan View Post
I'm going to be using a separate 850 3s for the video equipment.

EDIT: I found that on previous planes, the video is effected by current draw from the motor revving if I have it on the same battery. Getting maybe a 40c or so may help this, but it's cheaper just to pay for a separate video tx/rx battery. I think I got a few 850 3 cells for like $8 a piece off HK.
Im using the same battery for flight and FPV. if you put a torroid ring on the esc wire going to the receiver, it will usually mitigate any video distortion.
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Old Aug 02, 2012, 06:20 AM
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Quote:
Originally Posted by asaak View Post
Yes please, that would be cool!!

BTW, what do you guys think it is better, 4S or 3S type batteries for this 1900 Wing plane?

I ask this because I am hesitating about what scorpion motor to buy, something like 1200kV for a 3S battery or a 900-1000kv version for a 4S.

thanks!
I agree with the pictures, it is always more informative with pictures.

Concerning the motor, I use a Cobra motor, 2820-12. It is rated for 970 KV, 9X6 prop and I run 4S battery's. I am happy with the performance. Max amps on take off approx. 32 amps. The Skywalker will climb great with the 1680 wing and I plan to upgrade to the 1900 wing within the next few weeks.

I am happy with the performance. Of course, once I am airborne, I wish I had more flight time which a smaller motor provide.

Hector
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Old Aug 02, 2012, 07:02 AM
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Originally Posted by webdr View Post
Im using the same battery for flight and FPV. if you put a torroid ring on the esc wire going to the receiver, it will usually mitigate any video distortion.
Hmm, will experiment with that.

It seems it's from the motor causing a voltage drop in the battery though. Similar to how a car battery's voltage drops to around 10 volts when the starter motor is engaged.
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Old Aug 02, 2012, 07:13 AM
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Thats standard with any battery really. But it should not affect video signal unless it dips below the minimum voltage required to power the vTx. And if you get to that point in the air, you have bigger problems!

Torroid filters installed close to the equipment are the key to getting good signals with no bleed.
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Old Aug 02, 2012, 08:01 AM
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Quote:
Originally Posted by webdr View Post
Thats standard with any battery really. But it should not affect video signal unless it dips below the minimum voltage required to power the vTx. And if you get to that point in the air, you have bigger problems!

Torroid filters installed close to the equipment are the key to getting good signals with no bleed.
Will definitely experiment with that then. The only reason I have my other theory is because the video only got really choppy when I throttled up. But that was probably because of the increased noise.

Also, isn't it still beneficial to use a separate battery? Say I run my 5000 and 4000 down to ~9.6v at the end of my flight, this wouldn't be enough voltage for the video equipment which requires 11.1v, correct?
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