Hp needed for % of Speed Increase

[Stan Back]

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

[racer x]

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

170.025mph on 600hp need 715 hp to get 180mph

[sabat]

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

[Stan Back]

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

[Cajun Kid]

Stan,

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

Charles

[racer x]

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

[desotoman]

Stan,

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

Tom G.

[Milwaukee Midget]

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

[Stan Back]

Payback is hill.

Stan

[Geo]

Did you want that formula to work forwards or backwards? 

Geo

[Stan Back]

Yes

[desotoman]

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.

[jacksoni]

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

[bvillercr]

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

it's called a rolling brick

[64avanti]

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!