First off. Thank you all. This is the advice I needed... now how much I take is my foolish impatient self failing to heed the solid advice here. Where I fail I learn. in a lesson that sticks (usually)
Is each pair of pads rated for 50A independently or is that the rating for the whole board?
Yes the board is rated for 200A and each pad is 50A. Also, I thought about cooling... I was thinking of making a under-wing scoop to pass air over an ESC/electronics pod.
Just a few point here:
1. If you draw max amperage from a single battery from all 8 motors, you are drawing a staggering 96a through an XT60, which is rated for 60a, 90 burst. I would probably switch out to either dual batteries or an xt-90 connector, which can do that constantly
2. I don't think 12a is a situation where i would trust a JST servo connection. Even on alternating, you can do some damage with 150w in 8 places. But that's just me. At a minimum, i would probably loop a ziptie over both sides of the connector between a pair of the wires on each side, just to make sure they stay together.
3. why not use a pair of these
4 in 1 ESCs? My thoughts would be that it is low weight, is easy to waterproof and keep in a centralized location that is less likely to see water. you also are not feeding 90a+through 1 pcb
4. i second
@DamoRC 's question on the PDB. If it says 4x50a, i'd say go for it. If it says 50a total, add a second PDB. The nice thing is this could theoretically give you two electrical systems, which wouldnt be bad if you had a short from water.
Overall, this is a very cool build!
@Horseman3381 you seeing this?
1. haven't thought about the total draw regarding connectors. On 3S each motor pulls less than 12A. somewhere near 10.5A I suppose. and on 2S around 8A. (3S-8*10.5=84A, 2S-8*8A=64A) so with a 2.2Ah 35C battery, max pull is 77A? This tells me if I want to keep 1 battery, then I need to have a xt90 plug, or two batteries either to 1 or 2 pdbs.
I believe I will dig out my second PBD and use two batteries. This should leave me with 2.2Ah-3S (2m full throttle), or 5Ah-2S (9m full Throttle).
2. I very much understand. I have succeeded in using this on
my tiny flying wing and this did not have heat issues at the connectors. even on 3s, and I went full bust on it for over a minute.
3. I don't have them and the purchase of one cost as much as all 8 escs. (again, good $deal)
4. see above. I like the idea of redundant systems in the event of failure.
Dang it
@FoamyDM I need you to stop starting all these cool projects!
How in the world do you expect me to get anything done when you keep adding projects to my build list?!
Not sure how I missed this project, just found it tonight...
Seriously, I have learned SO much from your project already, thank you!
I have 8 1104s AND an equal number of the 12a ESCs just waiting for a project...
Might be Ben's B-52, a multi engine $10 foam glider or this... have to wait till the end of February to see...
I cannot wait to see this in the air, if the thrust to weight ratio plays out, it ought to be a riot!
Thank you
@kilroy07 for the compliment. I feel the same way about
my project list too. Whenever
@rockyboy starts a new challenge. I still have the flying pancake and the Kalinin K-12 on my list from last year! And thank you. If I could finish them. I'd be stupid prolific. As the community grows, the new posts/cool projects add quicker. Miss a week and good luck finding the
gems. Also you could build a micro-gimbled octo-copter.
@
I noticed on most of the multi-engine planes, Each motor is setup as it's own plane with Battery, ESC, motor and prop. sometimes the batteries are centralized. It just seemed wasteful. like there is a smarter way is all.
I plan on doing a "micro" version of the
Hydra-Valkyrie-Amerika-Bomber. with twin 30mm or 55mm. or maybe a ducted 1806 sporting a 2.5-3" prop. (anyway it's a project for the summer.)
Revised Power Layout:
