Align 700mx rewind for 10s and 12s boats
- Site owner
- Oct 25, 2017
- 1 min read
Updated: Jun 9, 2023
Hi Just wanted to share my Align 700 mx rewind and some of it projected numbers from FE CALC.
Using spuds fast electric cal for a performance hydro The Sl 1.9mm 7 turn parallel wye 700mx align kicked back these numbers based on it's taken motor constants. Rm .oo5 ohms Kv 824 Io 3.27 amps @22.5 volts including radial fan load. Weight 448.8 grams In a performance hydro with 10s lipo @ 9800 mah and a castle 240. Prop wizard selected an ABC 1918 as the most efficient prop for the setup. Resultant: 28,221 rpm 141 amps 4,955.78 watts Pin 4,728.58 watts Pout run time 4.15 minutes est speed 79.20 mph or 127.46 Km/h Eff. 95.42%
ABC 1818 calculated as most efficient prop for performance hydro @ 12s lipo 9800 mah 33,940 rpm 153 amps Pin 6.394 kilowatts Pout 6.125 kilowatts Run time 3.85 minutes Est speed 90.12 mph or 145.03408 km/h Eff. 95.80 %
Christians 4125 /18
Total losses 148.38 watts
Copper .16 watts
Iron 148.22 watts
Battery .1 watts
Kt = 17.27 mNm/a
Km = ,1515 N/sqrt watts
Power density 47.82 Km²/g
So you all can see why he doesnt want to post this data beside mine.
What stands out first is the lehners iron loss is double mine at 148.22 watts. That comes from his 3.53 Io and the 42 volts it was recorded at. Mine is only 74 watts and it sounds that much cleaner too. Despite the lower resistance he stil lost more copper at .16 watts to my .1. watts. The Kt is higher of course as his KV is nearly half mine but his power density is 25% lower at 47.82 when mine is 59.88. His motor weighs 480 grams which is over 50 grams heavier than mine. his motor is also 3% less efiicient which equates to nearly 60% less throughput power.
What does it lead as its not much better…
We can see here where my custom wind max eta of 96.1 lies in this "reality" of theirs!!!.
First of all we see here that 93.5% eta is its max at 42 volts in his own calculations.
Now lets examine The 41 series lehner battery consumption and power density numbers based of Christian Lucas's own measured constants.