Apr 17, 2005, 03:16 AM
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Aurora Co.
Joined Aug 2004
50 Posts
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few questions about my power plant
Hi again. I've posted similiar questions in the past, but was long ago, and slightly different, so searching for that old thread wont answer my questions.
Gear i have:
mega 16/15/5
pheonix 25 esc.
kan 1050 nihm
My first question is, what prop should i use with this set-up? One problem with that question is i cant go to abything bigger than 7 inches, this setup is going in(and is already installed) a foam glider conversion i made into an rc pusher, the tail booms are made from some carbon fiber arrow shafts (i bought at a local archery range out of his "broken arrows" bucket for 1$ each), and are only 8 inches appart. the reason i placed them at 8 inches is because teh motocalc calculations i made long ago came up with an 8 inch prop pulling too many amps. well, now moto calc wants money for me to use it, and i just dont have the money to spend, so i used p-calc, i think its called, and its telling me 8 inches isnt too much for that motor/battery. Did i do something wrong calculating it last time? or this time? at any rate, what prop would be the best to use here? I currently have a 7x4 on there, don't expect it will pull too many amps, p-calc says around 18. I do understand i'm not getting the best out of this motor with only 8 cells, but 8-cell packs are what i have, and like i said, i just dont have money. I'm thinking the plane is a little heavier than the normal FF conversion, but still not too heavy i hope. one thing that adds to the weight of the aircraft is the four standard size, futaba s3004 servos, which leads to my next question...are 4 of those servos to much for the bec on the phx 25? the documentation says 8-cells, 3 high torque servos, or 4 micro servos, useing the 4 s3004s gonna be too much for it?
Hope i've given enough info to get my questions answered, looking forward to hearing what you more experianced people have to say.
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