mgcg

I'm using a Tacon Bigfoot 160 with a Turnigy Sentilon V4 100A 5-12s HV Bulletproof Speed Controller w/RPM Sensor

and 8 Cell battery on a 15 pound model whats the largest prop i can use

blvdbuzzard

I used this calc program.

http://ecalc.ch/motorcalc.php

I used an 8s battery 8000mah, 20x12 APC E prop and it calcs 76 amps, 344 ounces of thrust.

I figure about a 10% plus or minus to real world numbers. You would need a watt meter to keep from letting the magic smoke out.


Buzz.

Rodney

You can do some simple checks to answer your own question. What is the minimum ground clearance you need; this will determine the maximum diameter. Now you need to pick the pitch that will keep you within the maximum current ratings of your ESC and/or motor. That is where you need the watt meter so you can test with different amounts of pitch.

chuckk2

"whats the largest prop i can use"
One that loads the motor to no more than 2700W.