XelderX 157 Posted May 21, 2020 Report Share Posted May 21, 2020 This is way more interesting than anything going on in Champcar right now. 1 Quote Link to post Share on other sites
TiredBirds 1,061 Posted May 21, 2020 Report Share Posted May 21, 2020 59 minutes ago, XelderX said: This is way more interesting than anything going on in Champcar right now. ok join the challenge. rules are you have to use the standard pinewood derby kit to start, wheels block. Estes A8 motor, that's it. anything else is open Quote Link to post Share on other sites
TiredBirds 1,061 Posted May 21, 2020 Report Share Posted May 21, 2020 3 hours ago, Racer28173 said: Technically, that would be considered a motor swap. What did you use as the starting weight and HP in the calculator? you tell me the car weighs 5oz Quote Link to post Share on other sites
XelderX 157 Posted May 21, 2020 Report Share Posted May 21, 2020 1 minute ago, TiredBirds said: ok join the challenge. rules are you have to use the standard pinewood derby kit to start, wheels block. Estes A8 motor, that's it. anything else is open What's the competition format? I have a little bit of brain capacity left from all the other projects going on. 1 Quote Link to post Share on other sites
enginerd 6,733 Posted May 21, 2020 Report Share Posted May 21, 2020 9 minutes ago, TiredBirds said: ok join the challenge. rules are you have to use the standard pinewood derby kit to start, wheels block. Estes A8 motor, that's it. anything else is open Length of race? Surface? Surface prep / VHT? How wide are the lanes? Guardrails? 1 Quote Link to post Share on other sites
TiredBirds 1,061 Posted May 21, 2020 Report Share Posted May 21, 2020 2 hours ago, XelderX said: What's the competition format? I have a little bit of brain capacity left from all the other projects going on. we are trying to find the smoothest surface available. Most likely a parking lot. You take a pinewood derby kit. You have to use the standard block and wheels. The engine is an A8-3 Estes. all else is fair game. Longest run wins. NO wire guides all Free rocket over ground. Quote Link to post Share on other sites
TiredBirds 1,061 Posted May 21, 2020 Report Share Posted May 21, 2020 2 hours ago, enginerd said: Length of race? Surface? Surface prep / VHT? How wide are the lanes? Guardrails? no guardrails and no wire guides. You can use VHT but that would hurt the cause. Quote Link to post Share on other sites
Christian2001 0 Posted June 10, 2020 Report Share Posted June 10, 2020 What would happen if I made the entire bottom of my car flat with sheet metal. While marking scoops to allow air to flow through it to allow it to cool down the trans and diff? Quote Link to post Share on other sites
wvumtnbkr 7,475 Posted June 11, 2020 Report Share Posted June 11, 2020 On 5/21/2020 at 5:47 PM, TiredBirds said: we are trying to find the smoothest surface available. Most likely a parking lot. You take a pinewood derby kit. You have to use the standard block and wheels. The engine is an A8-3 Estes. all else is fair game. Longest run wins. NO wire guides all Free rocket over ground. I think you are gonna be firing rockets around a parking lot. I seriously doubt any of them are gonna go any kind of straight if my days of racing co2 cars and doing rocketry are any indication. Quote Link to post Share on other sites
mender 8,293 Posted June 11, 2020 Report Share Posted June 11, 2020 Hmmm... Quote Link to post Share on other sites
TiredBirds 1,061 Posted June 11, 2020 Report Share Posted June 11, 2020 10 hours ago, wvumtnbkr said: I think you are gonna be firing rockets around a parking lot. I seriously doubt any of them are gonna go any kind of straight if my days of racing co2 cars and doing rocketry are any indication. we shall see. round 2 coming up. I have a new design and it looks fast just sitting on the table. Quote Link to post Share on other sites
wvumtnbkr 7,475 Posted June 11, 2020 Report Share Posted June 11, 2020 Whoa, wait! You crazies did this once already? Awesome! Quote Link to post Share on other sites
TiredBirds 1,061 Posted June 11, 2020 Report Share Posted June 11, 2020 5 hours ago, wvumtnbkr said: Whoa, wait! You crazies did this once already? Awesome! yes... new build. Quote Link to post Share on other sites
@NineLivesJohnny 96 Posted October 7, 2020 Author Report Share Posted October 7, 2020 (edited) On 6/11/2020 at 2:23 PM, TiredBirds said: yes... new build. A sister company we are starting is for people to upload their soap box cars into CFD and get the actual performance numbers. Edited October 7, 2020 by @NineLivesJohnny Quote Link to post Share on other sites
TiredBirds 1,061 Posted October 7, 2020 Report Share Posted October 7, 2020 3 hours ago, @NineLivesJohnny said: A sister company we are starting is for people to upload their soap box cars into CFD and get the actual performance numbers. I'll send you some video when we run them.... I'm sure this would not be derby legal.....lol 1 Quote Link to post Share on other sites
@NineLivesJohnny 96 Posted October 7, 2020 Author Report Share Posted October 7, 2020 1 hour ago, TiredBirds said: I'll send you some video when we run them.... I'm sure this would not be derby legal.....lol is it like kickboxing where you'll get a warning first? lol 1 Quote Link to post Share on other sites
Old Guy Steve 29 Posted October 30, 2020 Report Share Posted October 30, 2020 Imagine if you will, that someone is crazy enough to actually decide to race a FWD hatchback. My goal was the eliminate the understeer with the splitter and balance the car with the rear sway bar, and not have drag of the rear wing at all. Worked very well at Nelson Ledges and Pittrace in our Coved shortened season. Questions: 1. If we add the rear wing, how much more front downforce can we expect to get in the front to get the car back to neutral? I do not think we need the wing. 2. With our protruding bumper, and low water temps, we can block off some of the air into the radiator. Is it better to tape the grill above the bumper, or add deflector plates under the bumper (as shown). The holes in the bumper are right in front of the intercooler and I would like to keep them open. So which is best for drag and downforce? Blocking off the grill, the bumper, or below the bumper. 3. I have the "required" NACA duct in the passenger wing window to cut down the open area. Should we make new ones with the 1" lip? What angle on the lip is best? 30 degrees? 4. On the 1/2" splitter leading edge, is a rounded radius that is equal top and bottom best? Or all to the bottom with a square top edge? Or the reverse? 5 The hood is getting replaced to eliminate the plastic exit ducts, remove the turbo cooling scoop, and leave the NACA duct to the oil cooler unfortunately. Suggestions? 1 Quote Link to post Share on other sites
@NineLivesJohnny 96 Posted November 24, 2020 Author Report Share Posted November 24, 2020 i love your ramps. What's the cross weight? ideally we want to have the aero load = to the chassis cross weight. The splitter looks effective like it could be making a real amount of downforce. without anything in the back the rear is going to make lift. meaning as you go faster the front will be pressed down and the rear being pulled up. on slow tracks it might not an issue. but on the faster ones the car could become dangerous to drive. one of those things that's not a real problem, until it is. that being said with a heavy front weight bias you won't need much downforce in the rear to bring a balance. We where seeing 55" wangs working well at a low aoa on FWD car. we even won the highly competitive Honda challenge class with that exact set up on an integra. and about adding drag our 70" wing @ 0*aoa only requires 2.2hp to move 100mph. a 55" wang would be <2hp Quote Link to post Share on other sites
333 Kinkle 75 Posted November 24, 2020 Report Share Posted November 24, 2020 Sent a PM some time ago. Thanks Quote Link to post Share on other sites
Timothy G. Elliott 103 Posted November 24, 2020 Report Share Posted November 24, 2020 Looks like mine plans for the Rabbit are right on line. Moved the air dam forward to front of bumper and adding an actual splitter, the air flow to the radiator will be from the center openings and thinking of taping off the grille with a strip or two to remove if needed for cooling, Jay had me declare the air dam as a splitter also as we have the points to work with so I am making it as well. Quote Link to post Share on other sites
mender 8,293 Posted November 25, 2020 Report Share Posted November 25, 2020 (edited) How much hp am I using with this wing? It's at 6 degrees AOA, which is what the drivers liked. I was going to reduce the AOA but they said no. Next year it'll get a bigger splitter, reduced grille and brake duct openings, covered headlight openings, wheel spats, and a hood vent. Any other suggestions? Edited November 25, 2020 by mender Quote Link to post Share on other sites
333 Kinkle 75 Posted November 25, 2020 Report Share Posted November 25, 2020 I do have a questions for an 86 mustang hatch back. Which is better a spoiler or wing? I see $100 wings with brackets. I am sure not all wings are equal. How big of side plates can you go? Double wing over single wing? I have factory spoiler only. Is there a dramatic change in the car when adding a wing. Will aero help my car turn or is this all straight high speed benefits. Splitter only? The car is only about 3 to 4" from the ground in the front. Your help will be appreciated. Quote Link to post Share on other sites
WTFover 9 Posted November 27, 2020 Report Share Posted November 27, 2020 So I've got an aero question regarding front splitters. How low is too low? We run your splitter and mounts on the Miata, and we haven't really seen any indication of dragging/scraping or other contact with the ground, even after Sebring. I know you want some air going underneath the nose of the car so that it can be accelerated and cause a pressure drop. I also know the Nascar guys try to run the nose as low as possible. Our car is about as low as it can get without negatively affecting suspension geometry. Quote Link to post Share on other sites
Throoster 1 Posted November 27, 2020 Report Share Posted November 27, 2020 Hard to compare NASCAR to what we do. Their oval tracks, for the most part, are much smother than most road courses. Might be because the ovals do not have big curbs. If I am still up to date on NASCAR tech, they also run a lot of coil bind suspensions, with the tire becoming the biggest spring once up to speed. That allows them to run a pretty low splitter with out worrying about fluctuations in height and the resultant changes in downforce as spring rates on those tires are in the 600-900 lb range. Find some pictures that compare a NASCAR teams short track, restrictor plate and road course cars. They are significatntly different from one another. I am pretty sure the road course cars have a higher ride height and do not run any where near the same springs as the oval cars. Quote Link to post Share on other sites
@NineLivesJohnny 96 Posted November 28, 2020 Author Report Share Posted November 28, 2020 On 11/24/2020 at 11:40 PM, mender said: How much hp am I using with this wing? It's at 6 degrees AOA, which is what the drivers liked. I was going to reduce the AOA but they said no. Next year it'll get a bigger splitter, reduced grille and brake duct openings, covered headlight openings, wheel spats, and a hood vent. Any other suggestions? is that our wing? Quote Link to post Share on other sites
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