Why NASA has to buy Russian rocket engines:

vuki · 24th October 2009, 05:48 PM

POCKOCMOC (Roscosmos) thinks the green one is 10W resistor.
NASA thinks the gold one is 50W resistor.

Seriously, does anyone has some more info on those russian power resistors? I can say that leads are magnetic, but resistor body is not.

Michi124 · 24th October 2009, 06:04 PM

The size relations of those two resistors will look a bit different
when you add a 12" x 12" x 0.059" thick aluminum panel to
the Dale resistor, which is needed to make it survive its 50W
power rating. It's all in the datasheets...

vuki · 25th October 2009, 09:11 PM

Obviously it was a joke...
But since you seem to be good with datasheets, you wouldn't have the data for the green one, would you?

defect9 · 25th October 2009, 10:06 PM

are you sure it's not made out of candy?

vuki · 25th October 2009, 10:12 PM

Quite sure... tried to cut one in half but couldn't do it with "dremel".

alexberg · 29th October 2009, 02:54 PM

Quote:

Originally Posted by vuki

POCKOCMOC (Roscosmos) thinks the green one is 10W resistor.
NASA thinks the gold one is 50W resistor.

Seriously, does anyone has some more info on those russian power resistors? I can say that leads are magnetic, but resistor body is not.

Ceramic encapsulated carbon comp. TBO [t-v-o] Near extinction type.
http://www.reom.ru
Can be 60 W rated.
Low inductance, huge overload tolerance.
One shall recall Little Devils, which are epoxy encapsulated.
Google picture of the first American satellite insights.

Dale resistors are the wirewound ones - inductive - no good for anything but DC.
As it was correctly noticed, they do require external heatsink...
Counterpart С5-47
BTW It has nothing to do with space exploration and low price on Energia rocket engines, namely RD-180,

janneman · 29th October 2009, 04:00 PM

Quote:

Originally Posted by vuki

POCKOCMOC (Roscosmos) thinks the green one is 10W resistor.
NASA thinks the gold one is 50W resistor.

Seriously, does anyone has some more info on those russian power resistors? I can say that leads are magnetic, but resistor body is not.

So that gold one can operate on higher temp than the green one? Probably the gold one is build from better materials.

jd

russo · 29th October 2009, 05:28 PM

Quote:

Originally Posted by janneman

So that gold one can operate on higher temp than the green one? Probably the gold one is build from better materials.

jd

Dont think so, it is smaller, but without heatsink you wont get any 50w rating out of then, maybe not even 10w

kevinkr · 29th October 2009, 05:45 PM

Quote:

Originally Posted by russo

Dont think so, it is smaller, but without heatsink you wont get any 50w rating out of then, maybe not even 10w

RH-50: Actually about 12W without heatsink.. Derating further is a good idea however.

See here for full details on latest Vishay product: http://www.vishay.com/docs/50013/rh.pdf

These are actually pretty rugged and stable resistors. I use them a lot in my designs. There is also a non-inductive type available.

vuki · 29th October 2009, 10:55 PM

Thanks alexberg!

24th October 2009, 06:04 PM	#2
Michi124 diyAudio Member Join Date: Dec 2003 Location: Berlin, Germany	The size relations of those two resistors will look a bit different when you add a 12" x 12" x 0.059" thick aluminum panel to the Dale resistor, which is needed to make it survive its 50W power rating. It's all in the datasheets... __________________ Brutalized by bass and terrorized by treble...

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25th October 2009, 09:11 PM	#3
vuki diyAudio Member Join Date: Jun 2002 Location: zagreb, croatia	Obviously it was a joke... But since you seem to be good with datasheets, you wouldn't have the data for the green one, would you?

25th October 2009, 10:06 PM	#4
defect9 diyAudio Member Join Date: Sep 2007 Location: Carson City, NV	are you sure it's not made out of candy?

25th October 2009, 10:12 PM	#5
vuki diyAudio Member Join Date: Jun 2002 Location: zagreb, croatia	Quite sure... tried to cut one in half but couldn't do it with "dremel".

29th October 2009, 10:55 PM	#10
vuki diyAudio Member Join Date: Jun 2002 Location: zagreb, croatia	Thanks alexberg!

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