Variante: my F1 car

[variante]

the KVRC car is 95% different. It will be a quite conventional car. My old car wouldn't perform well in the CFD since it needs fine aero tuning, with all those innovations.

[astracrazy]

so i run a quick test on his nose for him.

velocity: 75 m/s
Lift: 196N
Drag: 94N

here is a few pics


- the blue bits must just be impurities

[wesley123]

Would be col if you could compare this to a regular high nose, and a nose like that without the bend in the underside, because I believe that nose is just draggy

[astracrazy]

i think the bend under the nose is the problem, if it was a lot flatter (like brawn style) you should get downforce not lift

[wesley123]

I dont really know, because such shape on the underside of the nose was applied in the LMP's for multiple years. They all had a diffuser on each side of the tub and a flat plane in the center as it didnt have the raised footbox, and they all carried the same shape.

but would be lovely to see how it works compared to a regular low nose, high nose and maybe some other varieties

[CottrellGP]

[quote="astracrazy"]so i run a quick test on his nose for him.

velocity: 75 m/s
Lift: 196N
Drag: 94N

Can i ask hat programs are used here?

[astracrazy]

so i run a quick test on his nose for him.

velocity: 75 m/s
Lift: 196N
Drag: 94N

Can i ask hat programs are used here?

solidworks. a novice on it but can do the basic stuff

i think a more diagonal approach under the nose would work better and removing the channels

[variante]

ok, you are going to laugh to what i'm going to say...
I have just tried to build a an actual model of that nose, similar to those built by PaulB (not as good, of course). I used a scale of 1/10, a velocity of less than 5m/s, and it came out that it was producing something like 0,08N of downforce.
The method i used is not that much "scientific", but it just does not seem like the model would ever create lift.

However, thanks to astracrazy, i now understand how that nose behaves at high speed...very inefficiently. If anyone has a bit of experience with this kind of design, or any idea... opinion are welcomed

[N12ck]

ok, you are going to laugh to what i'm going to say...
I have just tried to build a an actual model of that nose, similar to those built by PaulB (not as good, of course). I used a scale of 1/10, a velocity of less than 5m/s, and it came out that it was producing something like 0,08N of downforce.
The method i used is not that much "scientific", but it just does not seem like the model would ever create lift.

However, thanks to astracrazy, i now understand how that nose behaves at high speed...very inefficiently. If anyone has a bit of experience with this kind of design, or any idea... opinion are welcomed

to be honest the CFD data makes sense, if you look at your 'wing shaped nose' and look at it closely, the upper side has a larger surface area than the under side, the reason wings make low pressure on the under side is that the air has more surface area to cover than the upper side so if the upper side has more surface area than the under side then it is more likely it will create lift rather than downforce

Yours has a splitter so a big chunk of that surface area has been removed,

[variante]

i'm not saying that the analysis is wrong, infact it helped me a lot to understand air behaviour at high velocity.

the upper side has a larger surface area than the under side, the reason wings make low pressure on the under side is that the air has more surface area to cover than the upper side so if the upper side has more surface area than the under side then it is more likely it will create lift rather than downforce

The problem is not the exposed surface (a wing can produce DF even with one of the sides completely neutral). The problems of that nose are mainly 2:
1°: that splitter creates too much high pressure, making it impossible for the air to go upward and thus it does not create a "diffuser" effect
2°: that splitter acts as wall, deviating part of the mass of the upwashed flow, creating lift.

What astonishes me is this: since the lift described in the 2°point is generated purely by the inertia of the particles, how on earth is possible that this force is way stronger than the down-forces generated by the rest of the wing???

[hollus]

The only part of that nose that would create downforce, the bend in the lower part near the front, has a fake floor under it so the low pressure is wasted. The rest of it, as Nick said, is an inverted F1 style wing profile.

[variante]

hey guys,
i just wanted to see how the old livery looks like on the KVRC car... not bad, i think
BTW interesting updates on this car coming for the new Khamsin season

[variante]

Finally unveiling the latest model, specifically designed for KVRC 2013.




Let me know what you think. Suggestions are always welcomed.

Meanwhile i'll tell you that the car is not in its final configuration...mostly because i'm unsure about what components are the most effective (i haven't been able to run a single CFD analysis... ). For example, i might decide to use a high DF nosecone, modified Fwing, modified bargeboard and turning vanes... At least i can surely tell you that the rear wing is going to be way different (the current one is just aesthetics), and the diffuser will be pretty much the same used in the test race, which performed very well.
To be honest, i'm not fully convinced by this car (i relied a lot on CFD...). Let's see what happens...

[CottrellGP]

Love it!

[wesley123]

Looks good! Clean and simple, that is the right way to go.