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Old 24th October 2009, 05:48 PM   #1
vuki is offline vuki  Croatia
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Default Why NASA has to buy Russian rocket engines:

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.
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Old 24th October 2009, 06:04 PM   #2
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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...
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Old 25th October 2009, 09:11 PM   #3
vuki is offline vuki  Croatia
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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?
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Old 25th October 2009, 10:06 PM   #4
defect9 is offline defect9  Ireland
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are you sure it's not made out of candy?
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Old 25th October 2009, 10:12 PM   #5
vuki is offline vuki  Croatia
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Quite sure... tried to cut one in half but couldn't do it with "dremel".
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Old 29th October 2009, 02:54 PM   #6
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Default Resistors

Quote:
Originally Posted by vuki View Post
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,
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Old 29th October 2009, 04:00 PM   #7
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Quote:
Originally Posted by vuki View Post
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
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Old 29th October 2009, 05:28 PM   #8
russo is offline russo  Portugal
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Quote:
Originally Posted by janneman View Post
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
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Old 29th October 2009, 05:45 PM   #9
kevinkr is offline kevinkr  United States
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Quote:
Originally Posted by russo View Post
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.
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Old 29th October 2009, 10:55 PM   #10
vuki is offline vuki  Croatia
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Thanks alexberg!
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