BigAl's FD 20B racecar project
07-05-12, 06:15 PM
#603
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07-06-12, 09:30 AM
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Thanks guys for the kind words, sorry no numbers yet, remember I used the dyno for breakin purposes. I'll have numbers once I go to the chassis dyno. Plus the surrounding neighbors called the cops twice on us, so time was cut short. You can only imagine how loud this thing was
BigAl...
07-06-12, 09:55 AM
#606
Thanks guys for the kind words, sorry no numbers yet, remember I used the dyno for breakin purposes. I'll have numbers once I go to the chassis dyno. Plus the surrounding neighbors called the cops twice on us, so time was cut short. You can only imagine how loud this thing was
BigAl...
BigAl...
Just tell the police that you were watching NASCAR is HD and felt the need to TURN 'ER UP!!
07-06-12, 09:59 AM
#607
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you're actually pretty close to what actually happened. Cop "what the hell are you guys doing here?" BigAl "we're running an engine on a dyno" Cop "what kinda engine?" BigAl... "a rotary" Cop "a what?" BigAl... "one of those new engines, you know" Cop "oh yeah". then the next cop went similar but we felt bad for the neighbors and stopped.
BigAl...
07-06-12, 10:03 AM
#608
Team SR
you're actually pretty close to what actually happened. Cop "what the hell are you guys doing here?" BigAl "we're running an engine on a dyno" Cop "what kinda engine?" BigAl... "a rotary" Cop "a what?" BigAl... "one of those new engines, you know" Cop "oh yeah". then the next cop went similar but we felt bad for the neighbors and stopped.
BigAl...
BigAl...
Love it man!
09-23-12, 11:24 AM
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Well it's been a while since my last post, rest assured I've been working really hard on the race car, below is a few shots of some of the latest stuff I've done.
Here you can see I've added a flange to the header heat shield where I'll be bringing in air from a NACA duct that will be installed on the front bumper.
Before
After
So I decided to redo my wing mounts. In case you don't remember my wing mounts, this is what they used to look like which would have worked fine but I really like the new mounts!
heres the latest version (gotta keep up to date)
Other side
here's what I did for all of the air bleeds from the coolant system, I decided to put all of them in a central location.
more to come...
Here you can see I've added a flange to the header heat shield where I'll be bringing in air from a NACA duct that will be installed on the front bumper.
Before
After
So I decided to redo my wing mounts. In case you don't remember my wing mounts, this is what they used to look like which would have worked fine but I really like the new mounts!
heres the latest version (gotta keep up to date)
Other side
here's what I did for all of the air bleeds from the coolant system, I decided to put all of them in a central location.
more to come...
09-23-12, 02:17 PM
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you got it, they are at least 3-4 inches above the highest vent.
BigAl...
09-24-12, 06:43 PM
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09-28-12, 08:03 PM
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Here you can see the tiny Naca Duct that feeds the header heat shield
here is the battery tray, hold down and cover I made. The top is black Starboard, it's a pretty tuff plastic that's not as brittle as plexi.
the bottom tray and uprights are made of steel. The battery is a braille 3121, they make smaller batteries but I felt this model was a perfect mix of weight and reserve power.
more to come
BigAl...
here is the battery tray, hold down and cover I made. The top is black Starboard, it's a pretty tuff plastic that's not as brittle as plexi.
the bottom tray and uprights are made of steel. The battery is a braille 3121, they make smaller batteries but I felt this model was a perfect mix of weight and reserve power.
more to come
BigAl...
11-20-12, 09:41 AM
#623
>>Question: why did you hang/suspend the rear wing into Tension, rather than support into Compression?
I will toss in my answer based on very limited knowledge of this and this may not be exaclty right but close :-)
the smooth airflow over the bottom is more impotant that the airflow over the top in producing the downforce, thus if you move the mounting obstructions to the top of the wing, you keep the bottom surface smooth, improving its downforce function.
its is less 'bad' if the air going over the top of the wing gets 'spoiled' versus the bottom of the wing
remember this is really an inverse wing, so if we were talking about an airplane, we switch what we are calling top and bottom here.
I would bet this is one of the reasons you things like missle and fuel mounts on the bottom of airplane wings, disrupt the air on the top of the wing = very bad for lift, disrupt the air in the bottom of the wing, not as bad for lift
Ok, no we need a smart guy to correct that mess I just made above :-)
I will toss in my answer based on very limited knowledge of this and this may not be exaclty right but close :-)
the smooth airflow over the bottom is more impotant that the airflow over the top in producing the downforce, thus if you move the mounting obstructions to the top of the wing, you keep the bottom surface smooth, improving its downforce function.
its is less 'bad' if the air going over the top of the wing gets 'spoiled' versus the bottom of the wing
remember this is really an inverse wing, so if we were talking about an airplane, we switch what we are calling top and bottom here.
I would bet this is one of the reasons you things like missle and fuel mounts on the bottom of airplane wings, disrupt the air on the top of the wing = very bad for lift, disrupt the air in the bottom of the wing, not as bad for lift
Ok, no we need a smart guy to correct that mess I just made above :-)
11-20-12, 10:08 AM
#624
Yep, Bernoulli was proven wrong quite some time ago with regards to lift. On an aircraft the lift comes from the air flowing over the top of the wing and the Coanda effect. (the pricinple by wich air flowing over a surface will want to 'stick to' that surface. Once the air reaches the trailing edge it basically creates lift by shooting downward.
So on racecar downforce aero most of the work is done by the bottom side of the wing. While you are not gaining all that much by this mounting method, you do get some.
So on racecar downforce aero most of the work is done by the bottom side of the wing. While you are not gaining all that much by this mounting method, you do get some.
11-20-12, 10:54 AM
#625
hey chad,
'Yep, Bernoulli was proven wrong quite some time ago with regards to lift'
its funny yo mentioned that as I just read an article on this:
How Airplanes Fly
was very interesting to learn the actual deatails in how the wing produces lift, and how the Bernoulli effect is not the full picture.
may bad for thread hijacking!!! ok back to BigAl's cool car build stuff....did you see that sexy battery tray!! :-)
'Yep, Bernoulli was proven wrong quite some time ago with regards to lift'
its funny yo mentioned that as I just read an article on this:
How Airplanes Fly
was very interesting to learn the actual deatails in how the wing produces lift, and how the Bernoulli effect is not the full picture.
may bad for thread hijacking!!! ok back to BigAl's cool car build stuff....did you see that sexy battery tray!! :-)