It is currently Wed Feb 21, 2018 7:06 pm



Reply to topic  [ 3 posts ] 
 Horsepower Run Curve from ET Analyst 
Author Message

Joined: Wed Mar 03, 2010 10:52 am
Posts: 236
Ok, here is the challenge. Larry's ET Analyst gives the printout of the run from launch to finish with distance every 10 feet, g forces, time lapse, mph and rpm value at each 10 ft. s. How do I calculate HP Run Curve for the run? What formula? (tom c)


Wed Dec 01, 2010 11:44 pm
Profile

Joined: Wed Mar 03, 2010 10:52 am
Posts: 236
Found these formulas and thought they would work but can't come up with a formula that uses the g forces from a run to equate to a force value. The article is a good read. I thought his formula of 1 hp = 375 ft-lbs X mph would work but ????

Newton says: force = mass X acceleration. What are the units in acceleration? Mass would be vehicle weight in lbs. I think.

http://craig.backfire.ca/pages/autos/horsepower


Sun Dec 05, 2010 12:14 am
Profile

Joined: Wed Mar 03, 2010 10:52 am
Posts: 236
Came up with the following which calculate on my time slips from 0 movement to any position on the run distance.

Work = Force X Distance = Mass times Final Velocity squared divided by 2.

Once you get the work value in newton-meters you can convert to Power.

Power = Work divided by Time.

Once you get the Power in watts you can convert by 1 HP = 745.7 watts.

Above assumes no friction or aero drag, so strictly required force to move "X "mass from 0 to a Final Velocity. I quess it could be considered rear wheel hp or ???. (tom c)


Sun Dec 12, 2010 11:21 am
Profile
Display posts from previous:  Sort by  
Reply to topic   [ 3 posts ] 

Who is online

Users browsing this forum: No registered users and 1 guest


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Jump to:  
Powered by phpBB® Forum Software © phpBB Group
Designed by ST Software for PTF