Archive rec.autos.simulators

Get LEADFOOT NOW!!!

Alex Camero

Get LEADFOOT NOW!!!

by Alex Camero » Tue, 29 May 2001 02:37:09

It's the rotating mass of the wheels and it 100% definatly does happen like
that (with 1/10th scale off road r/c cars, and GPL ;))


> Really? Not challenging, but I just don't get the physics of why
> accelerating or braking has ANY effect on a car not in contact with
> the ground. I could see engine torque playing a part in causing the
> car to rotate obliquely on its axis a bit while airborne, but nothing
> else. I raced dirt years ago (anyone remember Bultaco?) and can tell
> you that unless somethings changed, the only thing you could do when
> airborne was shift your weight to keep the bike right for landing.

> More curious than anything else..

> G Patricks



> >It is a fun game but it's no GPL in dirt, one BIG bad point is the cars
jump
> >wrong that type of racing a bit like super/motorX is as much about
driving
> >the cars in the air as much as on the ground. In Leadfoot this is just
> >missing if you press the throttle while in the air the front end should
come
> >up if you brake it should go down but in Leadfoot nothing happens, I
don't
> >want to sound picky but this is a big miss. Apart from that it is good
fun
> >but imo games like Rally Masters have far better physics.

Thom j

Get LEADFOOT NOW!!!

by Thom j » Tue, 29 May 2001 06:16:20

Ok Davie H now its ur turn!! How old are you cuz my first real
un-professional race bike was a Bull & then a Husky. You cant
be this old? aka 60s. Btw: you are "spot-on" about the spinning
wheels in the air.. I'm impressed!! Not that I make a diff.. :o)

|   Watch any modern MotoX or Supercross racing.  Those guys alternate
between
| stopping the front wheel in the air or the rear depending on how and where
| they want to land.  Using the brakes should have a very big impact on the
| inflight attitude of the car.  After all, you have 4 very large rotating
| masses on a car, the gyroscopic effects of these spinning wheels is pretty
| tremendous.  soo stopping that rotation via the brakes should make a
| profound difference.
|   Oh yes...I remember Bultaco's  and Maico's and Husky's.  I got to ride
| another Spanish marque..I think it was a Montessa...whoooo!
| dave henrie

Jonny Hodgso

Get LEADFOOT NOW!!!

by Jonny Hodgso » Tue, 29 May 2001 06:30:45


You beat me to it ;-)

In 1/10th off road, learning to 'fly' the car over jumps and tabletops
is definitely part of the art.  Much like Flugplatz, indeed!

Jonny



> > Really? Not challenging, but I just don't get the physics of why
> > accelerating or braking has ANY effect on a car not in contact
with
> > the ground. I could see engine torque playing a part in causing
the
> > car to rotate obliquely on its axis a bit while airborne, but
nothing
> > else. I raced dirt years ago (anyone remember Bultaco?) and can
tell
> > you that unless somethings changed, the only thing you could do
when
> > airborne was shift your weight to keep the bike right for landing.

> > More curious than anything else..

> > G Patricks

Dave Henri

Get LEADFOOT NOW!!!

by Dave Henri » Tue, 29 May 2001 13:05:08

  My first bike was the very first Honda two stroke...the MT 250 and it's
racing equivilant the CR 250 Elsinore.
I'm in my mid 40's last I checked...
(ps...ever try and get warranty work from a Honda Mechanic when all he's
ever seen is 4 strokes???)
dave(not as old as Tom but more ma....nawwwww)henrie

> Ok Davie H now its ur turn!! How old are you cuz my first real
> un-professional race bike was a Bull & then a Husky. You cant
> be this old? aka 60s. Btw: you are "spot-on" about the spinning
> wheels in the air.. I'm impressed!! Not that I make a diff.. :o)


> |   Watch any modern MotoX or Supercross racing.  Those guys alternate
> between
> | stopping the front wheel in the air or the rear depending on how and
where
> | they want to land.  Using the brakes should have a very big impact on
the
> | inflight attitude of the car.  After all, you have 4 very large rotating
> | masses on a car, the gyroscopic effects of these spinning wheels is
pretty
> | tremendous.  soo stopping that rotation via the brakes should make a
> | profound difference.
> |   Oh yes...I remember Bultaco's  and Maico's and Husky's.  I got to ride
> | another Spanish marque..I think it was a Montessa...whoooo!
> | dave henrie

Asbj?rn Bj?rnst

Get LEADFOOT NOW!!!

by Asbj?rn Bj?rnst » Tue, 29 May 2001 13:27:18


>   Watch any modern MotoX or Supercross racing.  Those guys alternate between
> stopping the front wheel in the air or the rear depending on how and where
> they want to land.  Using the brakes should have a very big impact on the
> inflight attitude of the car.  After all, you have 4 very large rotating
> masses on a car, the gyroscopic effects of these spinning wheels is pretty
> tremendous.  soo stopping that rotation via the brakes should make a
> profound difference.

I think you mean inertia, not gyroscopic effect. The gyroscopic effect
helps keep the *** side down, but it is the inertia of the wheels
that gets transferred to the whole car when you use the brake and make
it tip it's nose down.
--
  -asbjxrn
Dave Henri

Get LEADFOOT NOW!!!

by Dave Henri » Tue, 29 May 2001 13:30:39

  but isn't a gyroscope just a spinning wheel??
Don't worry if I'm wrong...it won't be the last time..:)
(i guess the gyroscope effect would be like TURNING the front wheel in mid
air..and like you said the Inertia comes from stopping or not stopping a
wheel's spin.-- is that closer to the truth?)
dave henrie


> >   Watch any modern MotoX or Supercross racing.  Those guys alternate
between
> > stopping the front wheel in the air or the rear depending on how and
where
> > they want to land.  Using the brakes should have a very big impact on
the
> > inflight attitude of the car.  After all, you have 4 very large rotating
> > masses on a car, the gyroscopic effects of these spinning wheels is
pretty
> > tremendous.  soo stopping that rotation via the brakes should make a
> > profound difference.

> I think you mean inertia, not gyroscopic effect. The gyroscopic effect
> helps keep the *** side down, but it is the inertia of the wheels
> that gets transferred to the whole car when you use the brake and make
> it tip it's nose down.
> --
>   -asbjxrn

Thom j

Get LEADFOOT NOW!!!

by Thom j » Tue, 29 May 2001 14:01:25

Hey nut ball!! OMG I am laughing to hard to type.. phew..
Anyway what in the hell is: "ma....nawwwww" anyway?
Damn ur funny!!

|   My first bike was the very first Honda two stroke...the MT 250 and it's
| racing equivilant the CR 250 Elsinore.
| I'm in my mid 40's last I checked...
| (ps...ever try and get warranty work from a Honda Mechanic when all he's
| ever seen is 4 strokes???)
| dave(not as old as Tom but more ma....nawwwww)henrie

Dave Henri

Get LEADFOOT NOW!!!

by Dave Henri » Tue, 29 May 2001 14:25:03


<engage George Bush Sr mode>
  "Won't go there...wouldn't be prudent."
<disengage BFs mode>
dh

Asbj?rn Bj?rnst

Get LEADFOOT NOW!!!

by Asbj?rn Bj?rnst » Tue, 29 May 2001 16:12:55


>   but isn't a gyroscope just a spinning wheel??
> Don't worry if I'm wrong...it won't be the last time..:)
> (i guess the gyroscope effect would be like TURNING the front wheel in mid
> air..and like you said the Inertia comes from stopping or not stopping a
> wheel's spin.-- is that closer to the truth?)

Yes.
If you can handle the math:
http://www.racesimcentral.net/

Basically, if you try to tilt a gyro, you will experience a force 90
degrees to the direction of the tilt. This is gyroscopic forces.
But if you spin up/brake a wheel, you will experience a force in the
opposite direction of the way you accelerate/brake the wheel due to
inertia. (This is why you have a tail rotor on helicopters, to stop
the***pit from spinning the opposite way of the rotor.(Oversimplify?
Me?  Nahh.)
--
  -asbjxrn