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Top speed HP calculator... (Read 255 times)
Serowbot
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OK.... so what's the
speed of dark?

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Tucson Az
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Top speed HP calculator...
07/24/14 at 18:14:38
 
Here's an interesting calculator to estimate hp needed for different speeds...
For a Savage,... I guesstimated,...  
.95 drag,
6 sqft frontal area,
480lbs for me and my bike,
= 34hp to go 94mph.... that's my top speed...
http://www.wallaceracing.com/Calculate%20HP%20For%20Speed.php

( I'm 5-8" 145lbs)... my bike is 340 and has narrow drag bars...
Input your own combined bike/body weight,... also add some drag and frontal area if you are big or have a big winshield... input 1.0 for drag... and 8 or 9 sqft for frontal area ...

Give it try, and see what you think...

Wink...
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« Last Edit: 07/31/14 at 17:41:53 by Serowbot »  

Ludicrous Speed !... ... Huh...
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arteacher
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Re: Top speed HP calculator...
Reply #1 - 07/25/14 at 04:48:53
 
Combined wt = 630
Drag c of 1
85 mph
33.5 hp
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Kris01
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Re: Top speed HP calculator...
Reply #2 - 07/25/14 at 20:19:51
 
I think 0.8 cd is a little low for a bike with no fairings. 1.0 would probably be more of an honest number.
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There's no problem that a full tank of gas and a sunny day can't fix!

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Serowbot
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OK.... so what's the
speed of dark?

Posts: 26322
Tucson Az
Gender: male
Re: Top speed HP calculator...
Reply #3 - 07/26/14 at 08:19:44
 
Per Kris' suggestion,.. I changed the drag c. to .95...
... and the Frontal area to 6 sqft...

I think Kris is correct,... these numbers are more realistic... Wink...
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« Last Edit: 07/31/14 at 17:52:15 by Serowbot »  

Ludicrous Speed !... ... Huh...
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GridMonkey
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Re: Top speed HP calculator...
Reply #4 - 08/21/14 at 00:08:53
 
Serow, I'm right there with you on numbers, +/- a few inches/lbs for bars/weight. As i've had mine up to 85+ ( had to stop checking down at the speedo  around 83, it got a little dodgy/shimmy in it) I still had some room left in the throttle, gave a quick twist, felt it grab for more but backed down due to the shakes, I'd say we could run to 95 for sure. I think it's all stock, except for the Jardine.

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Neilap
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Re: Top speed HP calculator...
Reply #5 - 04/17/15 at 20:06:45
 
Im not sure about this. Im 6'4 and 350 lbs. I dont add width to the bikes but i have had it to 85 without an issue. At that point it was creeping speed slowly. And i have a windsheild and small saddlebags
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old.indian
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Re: Top speed HP calculator...
Reply #6 - 05/01/15 at 18:19:30
 
The fly in the ointment of all of this is if you are clocked, or using the speedo on the bike to quote the MPH.   When I first got mine I clocked my time at various speedo readings, and the speedo was "optimistic" at every speed except "0".   I just put a set of Michelin Commander lls with a 14/90/15 on the rear. Doing the math, I gained 6% in rear circumference over a "stock" 14/80/15 and over 8%+ vs. the worn IRC I replaced.    6% additional rear tire circumference will equal a reduction of 240 RPM at 60 MPH. (Factory spec. = 3940RPM @ 60 mph.)  
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Neilap
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Re: Top speed HP calculator...
Reply #7 - 05/03/15 at 02:08:31
 
old.indian wrote on 05/01/15 at 18:19:30:
The fly in the ointment of all of this is if you are clocked, or using the speedo on the bike to quote the MPH.   When I first got mine I clocked my time at various speedo readings, and the speedo was "optimistic" at every speed except "0".   I just put a set of Michelin Commander lls with a 14/90/15 on the rear. Doing the math, I gained 6% in rear circumference over a "stock" 14/80/15 and over 8%+ vs. the worn IRC I replaced.    6% additional rear tire circumference will equal a reduction of 240 RPM at 60 MPH. (Factory spec. = 3940RPM @ 60 mph.)  


Iv been using construction zone speed things. Im 2mph slower than my speedo tells
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old_rider
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Re: Top speed HP calculator...
Reply #8 - 05/03/15 at 08:05:36
 
I just twist and go....   Grin Grin

Thanks for the inputs fella's.... pretty soon someone around my height and weight will post and I won't have to hurt my brain figuring it outSmiley

They have bike weeks here during the summer sponsored by Harley.... with a free dyno run (gotta get there early, the line is looonnnngggg).... i'm hoping they do it this year too.
Wonder what kinda laughs i'll get from the crowd?

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We are here to laugh at the odds and live our lives so well that Death will tremble to take us.
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