R/C Tech Forums

Go Back   R/C Tech Forums > General Forums > Nitro Off-Road

Reply
 
Thread Tools Search this Thread
Old 06-10-2008, 02:21 PM   #1
Tech Elite
 
DOMIT's Avatar
 
Join Date: Oct 2007
Location: Fort Worth, Texas, USA, North America, Earth, Solar System, Milky Way Galaxy, Universe
Posts: 4,034
Trader Rating: 1 (100%+)
Send a message via MSN to DOMIT Send a message via Yahoo to DOMIT
Default RC Dyno ideas revisited...

Folks, I was poking around with my other hobby (experimental aircraft) and found an interesting homebuilt dyno for measuring torque at various RPM on an aircraft engine. I think a scaled down and slightly modified version of this would work pretty well.

All it needs are:

1) Something to apply load to the engine. Although they used a ground adjustable prop to "hold" rpm, the same thing could be done with a "squirrel cage" fan like used in air conditioners (to take most of the load) and brakes (to allow adjustment.) Use a regular buggy/truggy clutch and spur gear, and additional gears to get the fan RPM into the range where it is actually applying most of the load without being TOO much load.

2) An accurate scale, like a postal scale.

3) An engine mount that allows the engine to rotate around the crankshaft axis.

4) A tach to read the RPM of the fan, or another part of the gear train.

Torque is measured by an arm attached to the rotating engine mount, applying force to the scale. This will give you a torque reading at a given RPM (which the load is varied to control the RPM) Then it is simple math. No heavy, dangerous flywheels... no computers to mess with...

Thoughts?
__________________
Brad "DOMIT" Smith - I'm not fast, but at least I wreck a lot.
Unsponsored, but I use/recommend: XRay XB9, Alpha A852, Dynamite 053, Airtronics M11, Hitec 5955TG & 7955TG, ABEC 35 clutch and chassis bearings, PTRCRacing shock and diff fluids, Ready Rollers ceramic engine bearings. ** Team Terribles Region 9 coordinator. ** JOIN TEAM TERRIBLES! All racers welcome! PM me for details.
DOMIT is offline   Reply With Quote
Old 06-10-2008, 02:46 PM   #2
Tech Elite
 
Rick Hohwart's Avatar
 
Join Date: Sep 2003
Posts: 3,926
Default

This is a very good engine dyno...

http://www.nitrodynesystems.com/
Rick Hohwart is offline   Reply With Quote
Old 06-10-2008, 02:55 PM   #3
Tech Elite
 
DOMIT's Avatar
 
Join Date: Oct 2007
Location: Fort Worth, Texas, USA, North America, Earth, Solar System, Milky Way Galaxy, Universe
Posts: 4,034
Trader Rating: 1 (100%+)
Send a message via MSN to DOMIT Send a message via Yahoo to DOMIT
Default

Quote:
Originally Posted by Rick Hohwart View Post
This is a very good engine dyno...

http://www.nitrodynesystems.com/
Yup... it should be... "Current X-Dyno retail price: $5495



I am pretty sure one built the way I am describing could be built for about 5% of that cost... and give equally accurate test results. But... It's bling, yo!
__________________
Brad "DOMIT" Smith - I'm not fast, but at least I wreck a lot.
Unsponsored, but I use/recommend: XRay XB9, Alpha A852, Dynamite 053, Airtronics M11, Hitec 5955TG & 7955TG, ABEC 35 clutch and chassis bearings, PTRCRacing shock and diff fluids, Ready Rollers ceramic engine bearings. ** Team Terribles Region 9 coordinator. ** JOIN TEAM TERRIBLES! All racers welcome! PM me for details.
DOMIT is offline   Reply With Quote
Old 06-10-2008, 02:55 PM   #4
Tech Master
 
mugenb46's Avatar
 
Join Date: Jun 2006
Location: springfield tn
Posts: 1,385
Trader Rating: 4 (100%+)
Default

Quote:
Originally Posted by Rick Hohwart View Post
This is a very good engine dyno...

http://www.nitrodynesystems.com/
and $6,000
__________________
Brian Carey
Pro Twister Mods
brian@protwistermods.com
615-838-5373
mugenb46 is offline   Reply With Quote
Old 06-10-2008, 02:58 PM   #5
Tech Master
 
mugenb46's Avatar
 
Join Date: Jun 2006
Location: springfield tn
Posts: 1,385
Trader Rating: 4 (100%+)
Default

all i need is the soft wear, sensors and dyna mite box, i can build the rest, just finding the box thats programed for this application is tuff.
__________________
Brian Carey
Pro Twister Mods
brian@protwistermods.com
615-838-5373
mugenb46 is offline   Reply With Quote
Old 06-10-2008, 03:51 PM   #6
Tech Champion
 
Maximo's Avatar
R/C Tech Elite Subscriber
 
Join Date: Jan 2005
Posts: 7,900
Trader Rating: 11 (100%+)
Default

I beleive the datamite box is already setup with the needed programming... I have talked with them and it seems pretty straight forward to do... They have alot of advice on sizing of the flywheel and gearing requirements....... I would love to have a dyno to play with but spending 6K is more then I can stomach for my hobby.... Datamite has some new blackbox options that are priced very good, which would make a simple dyno really affordable to build.....
Maximo is offline   Reply With Quote
Old 06-10-2008, 03:53 PM   #7
Tech Champion
 
Maximo's Avatar
R/C Tech Elite Subscriber
 
Join Date: Jan 2005
Posts: 7,900
Trader Rating: 11 (100%+)
Default

Here is a link to the datamite packages

http://www.performancetrends.com/DataMitePricesOnly.htm
Maximo is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
trinity dyno,integy spring dyno,new g11 speed contorls,and more Warren Weaver R/C Items: For Sale/Trade 64 05-01-2008 09:30 AM
Novak Smart Tray revisited Still Bill Electric On-Road 14 08-01-2004 09:49 PM
Parmas faschange paint revisited Foger Rox Chat Lounge 24 10-03-2001 12:51 PM



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 11:55 PM.


Powered By: vBulletin v3.9.2.1
Privacy Policy | Terms of Use | Advertise Content © 2001-2011 RCTech.net