When FE racers talk about 2-lap events - we usually mean 2-3 laps total, not running round and round until we have two good laps. John said 'less than two minutes', for 2 - 3 laps that's not very fast..... :blink:
Jay as per John's first post this is a 2 lap application as he clearly stated "What size prop do I use for a 1527 .5 y motor in a 32 inch mono for oval record trials?" And yes he knows it'll make a good 4S heat racer as well. You done stirring yet?
Makes sense!propshop 4217 2blade or 3blade
http://www.prop-shop...product_type=25
it all comes down to the density of your chosen packs . , if running lipo, then as the pack runs flat the ESC has to draw more amperage to make up for the loss in voltage ..
to balance the wattage equasion ...
a better question is what prop can my lipo battery handle ! lol
jase
That is a good plan. Electric motors will draw as much current as they need to satisfy the load placed n them. So the higher the prop load, the higher the current draw. All the power in an FE boat is in the packs, so better packs mean higher performance. Too, the higher the motor rpm (same packs) the lower the current draw. Accelerating on and off adds very large current draw and can heat things up a bunch. The weak link in FE boats is usually the ESC. These are not really limited by amp draw, but by the heat buildup caused by high current. Keeping everything below 160*F should be safe, just remember that the ESC can cool off a lot between the time you stop running, untape and get the IR gun on the equipment. Bottom line, the more free-running the boat is the higher the rpm (speed), the lower the current draw, and the lower the temps.
That makes a lot more sense than the 2-minute comment in the first post. From that I assumed you were going for a NAMBA oval heat record rather than a 2-lap. As you are tuning the boat don't run more than 60 seconds before bringing it in to check the temperatures. I have seen far too many racers run for 2+ minutes on an untested setup and either get stranded on the course with burned up equipment or make it to shore with a motor temp of 200F+ (ruined motor) and/or puffed cells. Once you get it dialed in you will know how long you can run without endangering your equipment.
That makes perfect sense, I've run that motor in SAW applications myself.
You need to stop by sometime today and pick the loaner Schulze 40.160 ESC, bring a few crisp Benji's for a security deposit though. :lol: :lol: :lol: :lol:
YEAH BABY!!!!! Whoo-Hoo!!! Excellent John!!!!
John, is that the "Fear this" boat from the Oct, 2000 Boat Modeler mag???? B) ....==={]
Yes. It is the original wild thing named after my wife. She makes my heart sing......wild thing! It has been hanging up in the garage rafters for a decade. I saw some guys running them on u-tube and said. OH YA. Time to bring the wild thing back to life only this time....... ELECTRIC!!!
