Low Speed Fan Resistor - we need solution
#1501
I went to 2M school in the Navy, 5 weeks from repairing holes in boards, laying traces and soldering the whole 9 yards. Had a B level certification...was funny my Dad was an A and an instructor when he was in the Navy (ETCS 20yrs) and when he was a civilian. He used to keep me certified RIP Dad.
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WhoHasGotTheBlueS (11-11-2023)
#1503
No kidding. Like the 737 Max.
Soldering workmanship spec. There ought to be a GA equivalent of this.
Soldering workmanship spec. There ought to be a GA equivalent of this.
#1504
It is not about if it works or not. It will work unless you buy a undersized resistor. The point is what implication is the hack that you are so in love with down the road, for yourself and worst the next owner. Exposed high current 12V wiring is a major hazard
WRT soldering and wiring workmanship specs, most derive or cite MIL-STD_2000 and most if not all technical training schools use and refer to it for their training and certification courses.
FAA has EWIS but it deals more in the design rather than technical workmanship that is carried out in repairs and manufacturing.
Even if you are not doing something in aviation there are many pertinent good workmanship practices from the said specs that you can benefit. For the low speed fan resistor, I would rather buy a $15 communist made replacement instead of doing my own hack.
WRT soldering and wiring workmanship specs, most derive or cite MIL-STD_2000 and most if not all technical training schools use and refer to it for their training and certification courses.
FAA has EWIS but it deals more in the design rather than technical workmanship that is carried out in repairs and manufacturing.
Even if you are not doing something in aviation there are many pertinent good workmanship practices from the said specs that you can benefit. For the low speed fan resistor, I would rather buy a $15 communist made replacement instead of doing my own hack.
Last edited by pnwR53S; 07-23-2019 at 07:55 AM.
#1505
I am supremely confident in my abilities as a Journeyman Aviation Electrician. I have expert soldering skills and currently solder components as small as 201 (SMT) under a high powered microscope. I used 14AWG wire and is rated to 32A (should be more than enough). Soldering is more secure than mechanical connections and I have high temp heat shrink over both ends of the resistor (which are also soldered). Been doing electrical/electronics for over 30 years have a little bit of talent and knowledge.
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Andrew Riley (06-22-2021)
#1506
#1508
So my 2005 R53 had the burnt out low speed fan resistor issue, so I ordered this:
Installed it using 16 Gauge wire. Everything seems to work fine, but the resistor gets very hot to the touch. After the fan running on low speed for about 2 minutes (resistor has not been mounted anywhere just yet, just testing for now) I can't touch the resistor for more than a second without getting burnt.
Does this sound normal? Should I just bolt it up to the transmission mount on the driver's side of the engine bay and not worry about it? Do I need to add the thermal paste under the resistor before I bolt it to the mount?
Thanks!
https://www.amazon.com/Amico-Aluminum-Chassis-Wirewound-Resistor/dp/B008MLKUCC/ref=sr_1_1?rps=1&ie=UTF8&qid=1455378622&sr=8-1&keywords=100W%20Watt%200.33%20Ohm&refinements=p_85:2470955011&tag=vglnkc6797-20
Installed it using 16 Gauge wire. Everything seems to work fine, but the resistor gets very hot to the touch. After the fan running on low speed for about 2 minutes (resistor has not been mounted anywhere just yet, just testing for now) I can't touch the resistor for more than a second without getting burnt.
Does this sound normal? Should I just bolt it up to the transmission mount on the driver's side of the engine bay and not worry about it? Do I need to add the thermal paste under the resistor before I bolt it to the mount?
Thanks!
#1509
Definitely use thermal paste, with the amount of current running through the resistor, it WILL heat up (that's a fact of electrical resistance), keeping it thermally shorted will increase the life of the resistor. I bolted mine to an aluminum plate and the plate to the front aluminum chassis just behind the grille, so I've got airflow across the heatsink fins as well as a large thermal sink.
#1510
Definitely use thermal paste, with the amount of current running through the resistor, it WILL heat up (that's a fact of electrical resistance), keeping it thermally shorted will increase the life of the resistor. I bolted mine to an aluminum plate and the plate to the front aluminum chassis just behind the grille, so I've got airflow across the heatsink fins as well as a large thermal sink.
From reading this thread it seems the green Amazon unit I purchased is not as good quality as the gold Arcol units from a few years ago. Does anyone know where I can still buy the gold Arcol units? I'd like to keep a spare resistor around in case my green one goes out.
I am also thinking about finding some heat sinks I can stick on the outside of my green resistor to help dissipate some of the heat. I'll keep the thread updated with the heat sinks I buy so maybe we can continue to reliably use the green Amazon resistors since they are easier to find.
Thanks again!
Last edited by tej98; 08-14-2019 at 09:02 PM.
#1512
#1521
Fortunately, Blue Print is readily available in the EU, which is good news for me
Last edited by nd-photo.nl; 07-21-2020 at 04:26 AM.
#1523
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mountainhorse (07-11-2021)