R/C Tech Forums

Go Back   R/C Tech Forums > General Forums > Electric On-Road

Reply
 
Thread Tools Search this Thread
Old 08-04-2006, 06:12 AM   #46
Tech Regular
 
PeteB's Avatar
 
Join Date: Feb 2006
Posts: 477
Default

Quote:
Originally Posted by XrayFK
Have you measured the voltage output?
well I have a voltmeter so I can measure all sorts of stuff, but I thought that I would need to measure the output AMPs, not volts...
__________________
JRXS-R
GTB SS + 13.5 & 10.5
Trakpower 4900
Supernova
Nomadio
PeteB is offline   Reply With Quote
Old 08-04-2006, 06:27 AM   #47
Tech Master
 
XrayFK's Avatar
 
Join Date: Oct 2005
Location: San Diego, CA
Posts: 1,463
Trader Rating: 1 (100%+)
Default

Quote:
Originally Posted by PeteB
well I have a voltmeter so I can measure all sorts of stuff, but I thought that I would need to measure the output AMPs, not volts...
You said yourself that Power = Volts x Amps
Anyways, another method be a calculated flywheel method. Attach the motor to a flywheel of a given mass and you can derive the force needed to spin up the flywheel in respect to time. Then you can calculate power.
You can also use a cheap photo-tach sensor (20 bucks from Towerhobbies) to measure the RPM under load.
XrayFK is offline   Reply With Quote
Old 08-04-2006, 06:44 AM   #48
Tech Regular
 
PeteB's Avatar
 
Join Date: Feb 2006
Posts: 477
Default

Quote:
Originally Posted by XrayFK
Have you measured the voltage output?

Quote:
Originally Posted by XrayFK
You said yourself that Power = Volts x Amps
Anyways, another method be a calculated flywheel method. Attach the motor to a flywheel of a given mass and you can derive the force needed to spin up the flywheel in respect to time. Then you can calculate power.
You can also use a cheap photo-tach sensor (20 bucks from Towerhobbies) to measure the RPM under load.
Hang on a sec...

I did say that Power = Volts x Amps
I also said I am inputting 1volt, and measuring amps, to derive watts, why would i need to measure the output volts?? have I missed something?

I dont think I need to measure output volts...


Remember this thread is about building and making your own gadgets.

The flywheel method is great if you have a lab at home, or can access the equipment to machine all the parts you need... I, unfortuantly dont have access to these tools

I know some of the theory of a flywheel mass accelarator, have you actually built one that works? if so, please post some pics, and your schematics.
__________________
JRXS-R
GTB SS + 13.5 & 10.5
Trakpower 4900
Supernova
Nomadio
PeteB is offline   Reply With Quote
Old 08-04-2006, 07:01 AM   #49
Tech Master
 
XrayFK's Avatar
 
Join Date: Oct 2005
Location: San Diego, CA
Posts: 1,463
Trader Rating: 1 (100%+)
Default

Nope, I don't have my own dyno built, just going back to stuff I learned in Mechanical Physics and Engineering.
XrayFK is offline   Reply With Quote
Old 08-04-2006, 07:08 AM   #50
Tech Regular
 
PeteB's Avatar
 
Join Date: Feb 2006
Posts: 477
Default

so, why would i need to measure the output volts?

what useful info would that provide?
__________________
JRXS-R
GTB SS + 13.5 & 10.5
Trakpower 4900
Supernova
Nomadio
PeteB is offline   Reply With Quote
Old 08-04-2006, 07:48 AM   #51
Tech Addict
 
Join Date: Feb 2006
Posts: 734
Trader Rating: 4 (100%+)
Default

Where does everyone get the cool red and blue project boxes for the power supply distributors? I'm looking to make one myself but can only find plain black ones.
JoelV is offline   Reply With Quote
Old 08-04-2006, 10:23 AM   #52
Tech Apprentice
 
scottwk1's Avatar
 
Join Date: Mar 2006
Posts: 61
Default

I found them at http://www.hammondmfg.com/dwg2c.htm but then had to order them from one of their distributors.
scottwk1 is offline   Reply With Quote
Old 08-04-2006, 10:29 AM   #53
Tech Master
 
nordheim's Avatar
 
Join Date: Jun 2005
Location: Puyallup, WA
Posts: 1,725
Trader Rating: 6 (100%+)
Default

Quote:
Originally Posted by JoelV
Where does everyone get the cool red and blue project boxes for the power supply distributors? I'm looking to make one myself but can only find plain black ones.
I get mine from All Electronics http://www.allelectronics.com/cgi-bi...ch=&searchtype=

I sold over 100 of them before I slowed down my production due to time.
__________________
SEATTLEINDOORRACEWAY.COM - VALLEYVIEWRC.COM
nordheim is offline   Reply With Quote
Old 08-04-2006, 10:33 AM   #54
Tech Master
 
nordheim's Avatar
 
Join Date: Jun 2005
Location: Puyallup, WA
Posts: 1,725
Trader Rating: 6 (100%+)
Default

[QUOTE=Drewdc90]
Quote:
Originally Posted by nordheim
I have made both Power Supply Distribution Boxes and Motor Coolers.


Like the boxes, but Love the cooler even more. I have tried the same but cannot get the device lower than 16 degrees C let alone form ice. Can you post details of have you built it??

And love the tyre warmers Pete.
I use 2 40mm 75/92W peltiers attached with Arctic Silver Epoxy. The trick is to use a heatsink with a copper base as this helps draw the heat out of the hot side of the peltier and make the opposite side cooler. Mine goes sub-zero in just minutes.
__________________
SEATTLEINDOORRACEWAY.COM - VALLEYVIEWRC.COM
nordheim is offline   Reply With Quote
Old 08-04-2006, 10:34 AM   #55
Tech Master
 
nordheim's Avatar
 
Join Date: Jun 2005
Location: Puyallup, WA
Posts: 1,725
Trader Rating: 6 (100%+)
Default

Quote:
Originally Posted by Tpg racer
Hey there, I was thinkin about makin a motor cooler but the peltier device is just hard to find here in Malaysia.

So I was thinkin about makin motor cooler by using copper tube wrap around the motor and having icy cool water flowing inside the copper tube.

I know that this is not very high tech and wouldn't bring the motor down to a chilly tempereature but I think it would work.
You can find Peltier devices all over the world. Shouldn't be that hard.
__________________
SEATTLEINDOORRACEWAY.COM - VALLEYVIEWRC.COM
nordheim is offline   Reply With Quote
Old 08-04-2006, 11:03 AM   #56
Tech Addict
 
Jam-ehz's Avatar
 
Join Date: May 2005
Location: Toronto, Canada
Posts: 592
Trader Rating: 6 (100%+)
Send a message via ICQ to Jam-ehz
Default

Here's a dude to contact for peltier coolers..

[email protected]

Just ask for a list of available peltier units, namely 40mm, and you'll get tons to choose from..

I've bought 4 from them on separate occasions, never failed me (2 I dropped by accident.. silly me)

They take Paypal, and they ship REALLY quick..

They sell them on eBay as well, but I just get them this way..

Anyone know where I can find double-sided thermal transfer tape? It'd go a LONG way to keep the unit and heatsink on top of the plate...
__________________
-=≡ Tamiya TA05 TRF415MSX F103R M-03R M-04 M-05 ≡=-
-=≡ CRC Carpet Knife 3.2 OFNA LD3 Pro Fastcats Spektrum ׀ווlı ≡=-
Jam-ehz is offline   Reply With Quote
Old 08-04-2006, 11:27 AM   #57
Tech Master
 
nordheim's Avatar
 
Join Date: Jun 2005
Location: Puyallup, WA
Posts: 1,725
Trader Rating: 6 (100%+)
Default

Quote:
Originally Posted by Jam-ehz
Here's a dude to contact for peltier coolers..

[email protected]

Just ask for a list of available peltier units, namely 40mm, and you'll get tons to choose from..

I've bought 4 from them on separate occasions, never failed me (2 I dropped by accident.. silly me)

They take Paypal, and they ship REALLY quick..

They sell them on eBay as well, but I just get them this way..

Anyone know where I can find double-sided thermal transfer tape? It'd go a LONG way to keep the unit and heatsink on top of the plate...
That's where I get mine from. The item # is cp1-12708 on the unit I use. Mike is great to deal with!
__________________
SEATTLEINDOORRACEWAY.COM - VALLEYVIEWRC.COM
nordheim is offline   Reply With Quote
Old 08-04-2006, 12:32 PM   #58
Tech Addict
 
Jam-ehz's Avatar
 
Join Date: May 2005
Location: Toronto, Canada
Posts: 592
Trader Rating: 6 (100%+)
Send a message via ICQ to Jam-ehz
Default

Nordheim.. do you just put two coolers side by side with a massive heatsink on top?

I've just been using a single CP1-12710 (40mm/85-110W) on a modified motor heatsink to clamp it on.. I wonder if I go big and get a 50mm/180W unit.. heheh..
__________________
-=≡ Tamiya TA05 TRF415MSX F103R M-03R M-04 M-05 ≡=-
-=≡ CRC Carpet Knife 3.2 OFNA LD3 Pro Fastcats Spektrum ׀ווlı ≡=-
Jam-ehz is offline   Reply With Quote
Old 08-04-2006, 12:43 PM   #59
Tech Master
 
XrayFK's Avatar
 
Join Date: Oct 2005
Location: San Diego, CA
Posts: 1,463
Trader Rating: 1 (100%+)
Post

A peltier that big is just overkill, the small 40mm ones that only draw around 4-5A are more than capable of freezing, it's all about how efficient you can utilize it's power. The two main things are keeping the hot side as cool as possible, and transferring the heat/cold as much as possible to the motor. Copper is the best value for transferring heat, silver is even better but no one is going to buy a block of silver to make a clamp. Aluminum on the other hand...is pretty crappy but will still work.
Also, try googling this:
micronized steel polymer bonding agent
XrayFK is offline   Reply With Quote
Old 08-04-2006, 12:47 PM   #60
Tech Master
 
nordheim's Avatar
 
Join Date: Jun 2005
Location: Puyallup, WA
Posts: 1,725
Trader Rating: 6 (100%+)
Default

Quote:
Originally Posted by Jam-ehz
Nordheim.. do you just put two coolers side by side with a massive heatsink on top?

I've just been using a single CP1-12710 (40mm/85-110W) on a modified motor heatsink to clamp it on.. I wonder if I go big and get a 50mm/180W unit.. heheh..
50mm peltiers wont be more effective.
2 peltiers are glued together with Thermal Epoxy and wired in series. The heatsink I use is a 60mm heatsink/fan combo from Fry's electronics. This has the copper base and does a great job drawing the heat from the Peltiers.
http://shop2.outpost.com/product/364...H:MAIN_RSLT_PG
Make sure you use a fanguard on top to protect your pinkies
I use 1 1/4" copper tubing split down the middle for the clamp and a flat piece of copper between the clamp and the peltiers. These coolers are much more effective than the MuchMore units, especially in very warm summer temperatures.

__________________
SEATTLEINDOORRACEWAY.COM - VALLEYVIEWRC.COM
nordheim is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
various stuff...LST Stuff, Trinity Battery case, MINI-T Pro, Vendetta Stuff, cleaning mach51 R/C Items: For Sale/Trade 1 03-06-2008 10:14 AM
all my stuff for sale: xbox 360, halo3, pc stuff, games, illegal firearms O.O LKMAO tony 06 Other Items: For Sale/Trade or Wanted to Buy 41 01-19-2008 01:15 PM
Some Revo Stuff... Some Mini-T Stuff... Misc. Stuff... Mallanaga R/C Items: For Sale/Trade 39 08-28-2007 10:30 AM
Sell-Out, PRO stuff, New stuff, Old stuff - CHEAP FreqETag R/C Items: For Sale/Trade 32 03-17-2006 08:54 AM
wanted 12th scale stuff, xxxs stuff, ntc3 stuff primusblowsgoat R/C Items: Wanted to Buy 6 03-25-2005 11:18 AM



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off



All times are GMT -7. It is currently 08:26 AM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
Powered By: vBulletin v3.9.2.1
Privacy Policy | Terms of Use | Advertise Content © 2001-2011 RCTech.net