zxrlocost
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| posted on 11/11/05 at 09:52 AM |
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so thats why the becs are so quick up to the 60 mark then aftre that aero dynamics kick in( never thought about that)
chris
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tks
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| posted on 11/11/05 at 01:13 PM |
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Room / Time
Its just about grip...
because the et speed is measured at the finals..an heavy car will because of its grip acelerate better once on speed....
we will move faster from standing..
also we need to took @ bhp figures because with more bhp your top speed will always be higher.....
Sow an cosworth with 240Bhp will have an high terminal speed, but will spent very much time on getting on speed, for us its in reverse..(fast On speed
but low top speed)
i think that in the first 4-6seconds of the launch weight/grip rate is very important..
after that its just BHP against resistance(air)...
also i think that the BEC is more time on 80+mph than the cosworth wy? because its faster on the 80mph..(resulting in an low ET time)
but then it grows slower..and the cosworth will still be pulling...(resulting in an highet ET speed)
the et time goes allong with the average?
The shorter the distance the more advantage will have the BEC/Locost....
its like the F1 against the Jet Fighter....
its about weight / grip ratio...
The jet fighter tops out the F1 on lets say 1400Km/h difference.. but because of its weight and bad tracion....it just needs time to put the energie
in his mass....
don't unther estimate the force of an Turbine! they have an very very high torque level and then when they turn on afterburner its even 170%!
sow its just is weight...
Tks
The above comments are always meant to be from the above persons perspective.
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kb58
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| posted on 11/11/05 at 02:19 PM |
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quote:
Originally posted by tks
Its just about grip...
Sorry, but when I read this I heard the guys in Mony Python's The Holy Grail.
"It's not a question of how he grips its..."
Sorry...
Mid-engine Locost - http://www.midlana.com
And the book - http://www.lulu.com/shop/kurt-bilinski/midlana/paperback/product-21330662.html
Kimini - a tube-frame, carbon shell, Honda Prelude VTEC mid-engine Mini: http://www.kimini.com
And its book -
http://www.lulu.com/shop/kurt-bilinski/kimini-how-to-design-and-build-a-mid-engine-sports-car-from-scratch/paperback/product-4858803.html
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G.Man
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| posted on 11/11/05 at 04:23 PM |
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quote:
Originally posted by tks
Its just about grip...
because the et speed is measured at the finals..an heavy car will because of its grip acelerate better once on speed....
we will move faster from standing..
also we need to took @ bhp figures because with more bhp your top speed will always be higher.....
Sow an cosworth with 240Bhp will have an high terminal speed, but will spent very much time on getting on speed, for us its in reverse..(fast On speed
but low top speed)
i think that in the first 4-6seconds of the launch weight/grip rate is very important..
after that its just BHP against resistance(air)...
also i think that the BEC is more time on 80+mph than the cosworth wy? because its faster on the 80mph..(resulting in an low ET time)
but then it grows slower..and the cosworth will still be pulling...(resulting in an highet ET speed)
the et time goes allong with the average?
The shorter the distance the more advantage will have the BEC/Locost....
its like the F1 against the Jet Fighter....
its about weight / grip ratio...
The jet fighter tops out the F1 on lets say 1400Km/h difference.. but because of its weight and bad tracion....it just needs time to put the energie
in his mass....
don't unther estimate the force of an Turbine! they have an very very high torque level and then when they turn on afterburner its even 170%!
sow its just is weight...
Tks
Ahem, Toque and BHP are an influential factor on acceleration, but the efficiency of the transmission and grip comes into play...
A jet engine doesn't produce torque (useable torque) it produces thrust, which is linear and relies on the friction with the air to convert that
into forward motion (the air produces and equal and opposite reaction) if you add a secondary turbine to convert that thrust into rotational force,
you get torque, which is commonly used on helicopters and turbo prop aircraft...
Torque will affect acceleration and top speed 100 ft/lbs of torque will move a car faster than 50 ft/lbs but also, the torque is the force that
overcomes gravity, aerodynamics etc etc... so once the initial movement has begun, the torque will dicatate whether a car slows or accelerates in
relation to the forces acting upon it...
Some state that if you redline a car through the gears you will get a slower ET than if you change gear early, ie when the torque starts to fall
off... but this really depends on the torque curve of the engine you are driving... and at what point on the curve you are in when you hit the next
gear... a prime reason why Bike engines use close ratio boxes...
BHP is merely a theoretical figure based on Torque and RPM... ie a rate of work... Torque specifies how much force is actually applied to the
backwheels (via the crank, transmission etc)...
Watt calculated that a horse could lift 550lbs of weight 1 foot in 1 second ie 550ft/lbs per second, its the "persecond" element that
gives the definition of power as opposed to torque...
Its an age old arguement, which I doubt will be settled here...
Merely stating a heavier car will accelerate faster due to its grip is really a bit wooly as other forces acting on the car have a big impact such as
aerodynamics, and a heavy car is not the only way of increasing grip...
The big difference between a 200bhp cosworth and a 200bhp BEC is the torque vs the weight...
You try sticking a cosworth YB thru a quaiffe reverse box and see how long it would last... same thing with a bike engine...
However the 200bhp BEC will be faster accelerating than the 200bhp cosworth engined car due to the weight... even with its much lower torque
figure...
Then of course you have the gearing... lower gears = torque multiplication = more chance of wheelspin...
Sigh, this could go on forever...
[Edited on 11/11/05 by G.Man]
Opinions are like backsides..
Everyone has one, nobody wants to hear it and only other peoples stink!
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