Ultra light 5" build - Page 2 - RC Groups
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Mar 06, 2017, 01:03 AM
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Quote:
Originally Posted by DMCfirestar500
Getting further, just ordered 1 x tattu 450mah 75c 4s and 3x tattu 650mah 75c 4s packs. at 55g and 74g respectively this racing build is getting closer and closer...
Wish you like it.
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Mar 06, 2017, 05:24 AM
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Quote:
Originally Posted by acepowling
Wish you like it.
Thanks, I'll be sure to provide plenty of feedback. Really hoping those packs live up to their C rating and I don't see much/any voltage sag.
Mar 06, 2017, 08:53 AM
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Do you have links to the other 20x20 stacks? i am having an aweful time finding other 20x20 stacks.

thanks
Mar 07, 2017, 05:57 AM
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Quote:
Originally Posted by transam2k4
Do you have links to the other 20x20 stacks? i am having an aweful time finding other 20x20 stacks.

thanks
The only other one I found sold on its own is the busybee2 but its only 10a and not rated for 4s. You could pull the stacks from another quad like the youbi 130mm I think it runs a 20x20 stack.

But I just got an email that the XJB stack is now only $40 for VIP members, so I might pull the trigger on it and test it out. Worst case scenario I don't like it and could probably resell it for the same price to someone doing a micro build.
Mar 07, 2017, 08:25 AM
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Let me know how it goes. I am looking for the same build expect i will probably go with the Hyperlite 2205 (2522 kv) motors at only 25 g each with lots of power.
Mar 07, 2017, 09:09 AM
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Before you buy look into this... I haven't looked into it yet but saw it show up in their homepage
http://www.banggood.com/search/minic...ry-top-bbanner
Mar 07, 2017, 09:10 AM
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Nevermind thats 10A as you mentioned earlier...
Mar 07, 2017, 09:30 AM
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I think thats a copy of the busybee. But yeah too low amp draw rating and only rated to 3s. Im not confident that the xjb could actually handle constant 25a on each motor but hoping it will hold up since a build that light should be fine with 12-15a escs.
Mar 07, 2017, 10:02 AM
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I think it comes down to heat handling which usually is achieved through mass to absorb heat and surface area to release the heat... It looks a bit bigger than the Busybee so maybe it can handle a bit more but not sure how much. Do you know anyway to test Esc amp rating?
Mar 07, 2017, 11:11 AM
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Quote:
Originally Posted by transam2k4
I think it comes down to heat handling which usually is achieved through mass to absorb heat and surface area to release the heat... It looks a bit bigger than the Busybee so maybe it can handle a bit more but not sure how much. Do you know anyway to test Esc amp rating?
The best way would be a pdb/osd with a current meter however I don't plan on installing a pdb on this build at all. I'll just rely on monitoring temps and performance. Hopefully these escs (most do) have some sort of thermal protection built in so that if they over load they don't just let out their magic smoke Either way I'll be happy to be the guinea pig for using this stack on a 5" build. Already ordered it came out to $36 shipped with another code I had so we will see how it performs.

I also have a 20ax4 all in one 30mm esc coming. Since I ordered 2 frames I may end building it both ways (with the 20mm stack vs the 30mm stack) to see the differences and which config I like better for racing. I only have 6 of the skitzo motors though so will have to swap motors when doing performance comparisons but I will continue to update this thread with progress.
Mar 10, 2017, 12:03 PM
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Well let us know when you have any updates!!!
Mar 10, 2017, 08:16 PM
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I definitely will. Now I wish I had paid for faster shipping because the weather here is terrible so would be perfect for a new build...
Mar 11, 2017, 02:07 PM
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I think I may order that 20x20 stack as well. Not blheli_s but for the weight and price it really can't be beat. Hope it takes a constant 20A
Mar 11, 2017, 02:54 PM
humayraykinaon's Avatar
In case that 10A 2-3s not enough for you, check this new one coming soon. I bet it won't be that long a 20a will be in 20x20

http://www.banggood.com/20x20mm-Race...ds=newArrivals

My 4" weight @ 156g so a 5" can be built below 200g
Last edited by humayraykinaon; Jul 25, 2017 at 07:18 PM.
Mar 11, 2017, 06:44 PM
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Quote:
Originally Posted by humayraykinaon
In case that 10A 2-3s not enough for you, check this new one coming soon. I bet it won't be that long a 20a will be in 20x20

http://www.banggood.com/20x20mm-Race...ds=newArrivals

My 4" weight @ 156g so a 5" can be built below 200g

That build looks promising. The esc i'm going with is actually a 25x4 although that 12a would probably be enough for an ultra light.

I got my motors and batteries today so the build is getting closer, hopefully I get the frames and esc/fc stack this week. I was suprised how small these batts are. I took a pic of them next to a 1500mah 4S 80C pack for reference.


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