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Author Topic: Hp needed for % of Speed Increase  (Read 16896 times)
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Stan Back
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« on: April 06, 2010, 05:56:28 PM »

What's the formula(s) for when you can go 160 on 500 HP, how fast you can go with 600 and/or if you need to go 180, how much increased HP you need.

You know -- the square of the increase(?) is half the angle of the dangle or whatever?

Help!!!

Simple Stan
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racer x
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« Reply #1 on: April 06, 2010, 06:19:04 PM »

I found this one
http://robrobinette.com/top_speed.htm

170.025mph on 600hp need 715 hp to get 180mph
« Last Edit: April 06, 2010, 06:21:59 PM by racer x » Logged

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sabat
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« Reply #2 on: April 06, 2010, 06:33:05 PM »

Here's Sumner's calculation Excel sheets, including the one you're looking for. 

http://purplesagetradingpost.com/sumner/bvillecar/bville-spreadsheet-index.html#Horse%20Power%20Needed
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« Reply #3 on: April 06, 2010, 06:41:31 PM »

The Robinette one gave some unbelievable figures -- and as usual I couldn't access Sumner's spreadsheets.  I guess I'll have to depend on the Shearers for the best answer.

Stan
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Cajun Kid
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« Reply #4 on: April 06, 2010, 06:43:47 PM »

Stan,

Just mash the gas pedal and hang on.....I am sure you have all the power you need.

Charles
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« Reply #5 on: April 06, 2010, 07:08:04 PM »

I think it goes... all the power you can afford dose not go as fast as you want.
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« Reply #6 on: April 06, 2010, 09:31:43 PM »

Stan,

Send me the numbers and I will crunch them for you.

Tom G.
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« Reply #7 on: April 06, 2010, 10:58:18 PM »

I think it goes... all the power you can afford dose not go as fast as you want.

Here's the formula - it's corollary is based on boat ownership -

($ x APR) + 5W = S x .99, where

$=$
APR = variable
5W = lodging
S = speed
.99 = "I'll be back next year" coefficient

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« Reply #8 on: April 07, 2010, 10:35:09 AM »

Payback is hill.

Stan
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« Reply #9 on: April 07, 2010, 10:49:10 AM »

Did you want that formula to work forwards or backwards?  evil

Geo
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Stan Back
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« Reply #10 on: April 07, 2010, 10:50:29 AM »

Yes
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« Reply #11 on: April 07, 2010, 12:36:22 PM »

Stan,

Send me the numbers and I will crunch them for you.

Tom G.

Stan,

Are you sure those are the right numbers you sent me? I come up with a minus 7. Sorry.

Tom G.
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« Reply #12 on: April 07, 2010, 12:48:30 PM »

If you are only going 160 on 500 hp you need a different car- 'less you are driving a freightliner or something!  cheers
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« Reply #13 on: April 07, 2010, 02:28:10 PM »

If you are only going 160 on 500 hp you need a different car- 'less you are driving a freightliner or something!  cheers

it's called a rolling brick grin
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« Reply #14 on: April 07, 2010, 11:38:33 PM »

The power is proportional to the speed.  To find the power take the ratio of the two speeds and cube that number.  180/160 = 1.125,  1.125 cubed =1.438  so 500 hp x 1.438 = 712 hp, rounded up

So how big is this car?  It has one heck of a CdA!
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