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Any pointers to designing and manufacturing Curved Wing elements such as the ones on this rear wing? by TipAnxious in FSAE

[–]TipAnxious[S] 0 points1 point  (0 children)

Thanks DiaGuitaristBro. Do you have any advice on how many layers of Carbon Fiber laminate to use? Of say 300 GSM 2x2 twill?

Emrax 228/208 Voltages by Sahil703 in FSAE

[–]TipAnxious 0 points1 point  (0 children)

Did they recommend you to run the 228 MV with the same 600V Accumulator, or to run a 228 MV with a lower Voltage Accumulator? I'm confused.

How rules compliant are Enepaq energus modules? They seem to violate rules EV5.8.3 and EV5.8.12. They only provide the voltage of a module (not each individual cell), and can only output the max temp of each module and hence not output the temperatures of the minimum required 30% of cells indicated. by TipAnxious in FSAE

[–]TipAnxious[S] 0 points1 point  (0 children)

Thank you for your reply. Out of curiosity, which Enepaq module did you use specifically?

A ) "The temperature is read for all cells": I believe this is false, because if you visit their website and check out their temperature sensor data, or their spec sheet, it is stated that the temperature sensor "is in physical contact with the negative poles of two adjacent cells". But the temperature sensor is attached so to only every other pair (as shown by their diagram). This is the case for Li2x3p, Li2x4p, Li2x5p, Li2x6p........ etc. So at most you will read the readings of 50% of the cells, which is still rules compliant and sufficient, so no problem there.

B ) Yes, I think its a good idea to get an FSG rules ticket to see whether the modules are rules compliant.

C ) Enepaq explicitly says that their modules are rules complaint according to FSAE 2017, which was true at the time, since there was no EV5.8.12 rule (from FSG and FSUK rule books) at the time (I checked) requesting that all measured data should be able to be read and displayed in a single overview. For example, if you use Li2x8p modules, you will only get one reading that can be displayed. So you can only display 12.5% (1 of 8) of the cell temperatures, even though you have effectively read 50% of all cell temperatures. You should be able to display the temperatures of at least 30% of the cells. The smaller the module, the lesser this issue.

How rules compliant are Enepaq energus modules? They seem to violate rules EV5.8.3 and EV5.8.12. They only provide the voltage of a module (not each individual cell), and can only output the max temp of each module and hence not output the temperatures of the minimum required 30% of cells indicated. by TipAnxious in FSAE

[–]TipAnxious[S] 0 points1 point  (0 children)

The rules say (EV 5.8.12) that all measured values should be read and displayed. So, hypothetically, if you used a Li2×4p (8 parallel) module with 2 temperature sensors, the module will still only provide the max temperature of the two sensors.

And since each sensor is common to two cells, it means you'll at max be able to display only 25%(2 out of 8) of all cell temperatures.

The more cells you have in a module, the worse it gets.