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Pros and Cons of Giant Scale electrics... (Read 31,337 times)
whitey
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Reply #20 - Feb 7th, 2013 at 11:15am
 


BTW, the nice thing about Hobby Partz is the $10 flat fee shipping!!


Not sure that is true today. The shipping charges have gone out of whack recently with the restrictions on shipping lipos. I've had orders come right through and others be subject to big additional charges. Recently had a n order from Hobby King go from $29 shipping to $75 and I couldn't figure out why. Turned out I had four Ni-Mi batteries in the order and that made it fall into the hazardous category. needless to say, I removed them .
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Reply #21 - Feb 7th, 2013 at 12:04pm
 
Annnnddddd with all that hazerdous cargo crud, Boeing has built lipos into their Dreamliner... Shocked
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Reply #22 - Feb 7th, 2013 at 8:34pm
 
Fingers wrote on Feb 7th, 2013 at 12:04pm:
Annnnddddd with all that hazerdous cargo crud, Boeing has built lipos into their Dreamliner... Shocked

with hobby king charging equipment.
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Reply #23 - Feb 7th, 2013 at 9:42pm
 
Now I'm starting to wonder if i have the right motor in the Yak. Undecided

When i do the math,  the flying weight should be around 18 pounds and depending on where i look, the Hacker A60-16l produces somewhere between 2600 and 3500 watts.  This gives 150-190 watts per pound....

Significantly less than you guys....i'm left feeling inadequate Shocked

lol...

what do you think?

Brian
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Ben Lann
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Reply #24 - Feb 8th, 2013 at 10:29am
 
I think the A80 is slightly overkill for my airframe Grin  I have seen youtube videos of 50cc conversions using the A60 and the A80.  Both seemed to fly well.

Couple videos

First one is a 92" Edge 540 on a Hacker Q80 (essentially the same as the A80 but lighter).
http://www.youtube.com/watch?v=9aUZnYkwv8U

Second is a 87" Extra SHP on a Hacker A60-18L
http://www.youtube.com/watch?v=K0FemdT5CxM

These are all Joe Smith and they are 3D hobbyshop frames which are generally lighter and much stronger than standard gasser airframes.  He has competed at XFC the last two years.  He also has an electricfied 104" running on a Q80.

Great night flight of the 104" Slick here.
http://www.youtube.com/watch?v=Mbv7lZxo44g
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« Last Edit: Feb 8th, 2013 at 10:47am by Ben Lann »  
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Reply #25 - Feb 8th, 2013 at 10:31am
 
While looking for the Joe Smith videos I did find one reason to not fly electric.

Check this out.
http://www.youtube.com/watch?v=k9mcNvOGKtI
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Reply #26 - Feb 8th, 2013 at 12:54pm
 
We can all fly like that Ben,  Shocked

lets see him fly a straight line! Roll Eyes

Love the last video!....wonder why it literally exploded into flame..  Huh
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Reply #27 - Feb 8th, 2013 at 4:21pm
 
Pretty good for an 18 year old  Shocked

According to the description the guy was charging the lipo inside the plane and heard a noise like a "fart"  Grin so they took the plane outside to investigate and that's when the fire started.

He could have easily chose the wrong setting on the charger.  I think my dad accidentally charged a 3S on a 5S charge setting once and had one go off.  Although he never did admit to it  Grin

Moral of the story is if you hear a fart at the field remove your lipo from your plane and discard it Grin Just to be safe lol

oh and don't charge your batts in your plane or heli.
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« Last Edit: Feb 8th, 2013 at 5:29pm by Ben Lann »  
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Reply #28 - Feb 8th, 2013 at 5:49pm
 
So, you're saying that every time Sandy farts, we all have to take the batteries out of our planes???? Grin

We won't do much flying!
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Reply #29 - Feb 8th, 2013 at 11:29pm
 
Brian wrote on Feb 7th, 2013 at 9:42pm:
Now I'm starting to wonder if i have the right motor in the Yak. Undecided

When i do the math,  the flying weight should be around 18 pounds and depending on where i look, the Hacker A60-16l produces somewhere between 2600 and 3500 watts.  This gives 150-190 watts per pound....

Significantly less than you guys....i'm left feeling inadequate Shocked

lol...

what do you think?

Brian


A DL or a DA will at best put out around 3700 watts so the Hacker A60 at 3500 watts would do fine.  My setup at 6000 watts is extremely overkill and not needed even for the most extreme aerobatics.  You don't need 300 watts per lb but it sure is fun to punch it for a few seconds.
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Reply #30 - Feb 9th, 2013 at 8:11am
 
Good Morning Guys, thanks for your input...so i guess i'm ok with the Hacker A60...

Just won't be able to accelerate vertically like a rocket ship!

I'm ok with that.

Mark, i just ordered one of the hobbyking 800 watt dual chargers, but i'm assuming i will need an 80 amp power supply to run this from my generator....do you find this or can you get away with less?

I was also thinking of phoning a computer repair place to see if they have old power supplies but i'm not sure they will be big enough.  Have you tried this route?

Thanks,

Brian
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Reply #31 - Feb 9th, 2013 at 10:55am
 
Brian
As far as the computer route, I've seen a couple of server power supplies that run 50-60 amps, I would expect that that's the average.
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Reply #32 - Feb 9th, 2013 at 1:15pm
 
I think the one I have is a 47 amp and I got it of rccanada.  I only paid $50
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Reply #33 - Feb 9th, 2013 at 7:51pm
 
Brian wrote on Feb 9th, 2013 at 8:11am:
Good Morning Guys, thanks for your input...so i guess i'm ok with the Hacker A60...

Just won't be able to accelerate vertically like a rocket ship!

I'm ok with that.

Mark, i just ordered one of the hobbyking 800 watt dual chargers, but i'm assuming i will need an 80 amp power supply to run this from my generator....do you find this or can you get away with less?

I was also thinking of phoning a computer repair place to see if they have old power supplies but i'm not sure they will be big enough.  Have you tried this route?

Thanks,

Brian


Both of my power supplies are server power supplies.  The majority of the PC power supplies are too small and won't let you take full advantage of the charger. 

In order to get the full 800 watts out of your charger, you would need a 12V supply capable of sustaining about 65 amps.  I have the same 47 amp HP power supply as Ben and I have a 60 amp HP supply aswell.  Both work very well. I got the 60 amp for about 40$ on Ebay and modified it.  Very easy to do with a decent soldering iron and a bit of wire.  I don't know how big of a battery you eventually plan on charging but with the 47 amp supply, you should be able to charge two 6S lipos at about 11 or 12 amps (or a 6000 mah lipo at 2C) at the same time.
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Reply #34 - Feb 10th, 2013 at 12:14pm
 
I use a power supply out of an old computer, have no idea what the output is in any kind of useful numbers but it runs my HK charger and my old Triton just great (label says 12V at 8 amp) if that means anything.......

have 1 or 2 more down there for the taking....

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Reply #35 - Feb 10th, 2013 at 12:25pm
 
Brian wrote on Feb 8th, 2013 at 5:49pm:
So, you're saying that every time Sandy farts, we all have to take the batteries out of our planes???? Grin

We won't do much flying!


we do have another
d
contender, in the club, who, far better
a
than I, qualifies for an
v
award for the generation of bench clearing, battery destroying, gut wrenching oderiferous
e
discharges which will "pin" the needle on any instrument used to detect
y
toxic industrial waste output...I can only fervently hope that none of you is flying down wind from one of his "events". It WILL bring you to your knees and likely cause the distruction of the aircraft you are flying at the time...his effluent has been known to melt indoor foamies.... Embarrassed
Now it is not in my nature to publicly reveal the name of this gent... but an effort to use subliminal advertising might save some member's plane...
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Reply #36 - Feb 10th, 2013 at 12:40pm
 
Quote:
we do have another
d
contender, in the club, who, far better
a
than I, qualifies for an
v
award for the generation of bench clearing, battery destroying, gut wrenching oderiferous
e
discharges which will "pin" the needle on any instrument used to detect
y
toxic industrial waste output...I can only fervently hope that none of you is flying down wind from one of his "events". It WILL bring you to your knees and likely cause the distruction of the aircraft you are flying at the time...his effluent has been known to melt indoor foamies.... Embarrassed
Now it is not in my nature to publicly reveal the name of this gent... but an effort to use subliminal advertising might save some member's plane...


Hmmmmm!!!! Read the fine Print.  Smiley
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Reply #37 - Feb 11th, 2013 at 4:23pm
 

http://www.memoryexpress.com/Products/MX32587?utm_source=eFlyer&utm_medium=email...

Glen wrote on Feb 9th, 2013 at 10:55am:
Brian
As far as the computer route, I've seen a couple of server power supplies that run 50-60 amps, I would expect that that's the average.

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Reply #38 - Feb 11th, 2013 at 9:02pm
 
FYI their is a guy on RCCanada selling 75 amps supplies for 150$.  Pretty good deal seeing as it is a quality supply and it is already modified and ready to go.
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Reply #39 - Feb 12th, 2013 at 8:07am
 
Thanks Mark,

I'll take a look...

Brian
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