Spoiler or Wing?

  • I was doing a search for DIY spoiler/wing and came across this article that does a good job of explaining the differences between a spoiler and a wing -


    This is brilliant! I've never seen an article that shows these ideas so clearly. Frankly, I didn't know the difference between the two, either, but it all makes sense.

    Could we get an effective spoiler for the slingshot? I'm not sure now. The sling has nothing like the cabin shape of a sedan. I'd be interested to see some laminar flow diagrams or wind tunnel smoke tests.

    The smarter you get, the funnier I am.

  • Here's another link I found that includes a video on using string attached to the body to measure air flow over different body panels, although it can be a complex and sometimes difficult to measure process - https://professionalawesome.com/diy-downforce/. Check out their Blog for info on some other interesting articles such as improving engine cooling, etc.

    The article also suggested to me that hoop-mounted wings may have less impact on exhaust fumes coming up over the back of the Slingshot and then being drawn into the cockpit than the products from UAS or Metricks (see here for samples - https://www.slingmods.com/pola…shot-wings-spoilers)since the latter products are at the rear edge of the Slingshot and therefore more likely to affect the air flow at the rear of the Slingshot compared to hoop-mounted wings that would be in what should already be a smoother airflow area. This assumes I correctly understood the article and properly applied what the article addressed to the Slingshot.

  • If airflow has to travel longer distances it increases speed. Causing lift on airfoil surfaces. An airfoil is curved, as in an aircraft wing the airflow over the top travels a longer distance in an effort to meet the airflow beneath. As velocity above increases (travels a longer distance) pressure decreases (creating a low pressure area). High pressure will always rush to low pressure. Thus creating lift. It is what gives lift to aircraft. Changed by alerions, slats & flaps.

    The variances (uplift or down) would be in the curvature (concave/convex) or lack of curvature. If you were to invert an aircraft wing it would stick to the ground.

    I believe the issue with exhaust fumes in the cockpit is an issue involving the placement of the exhaust coupled with a variance of aftermarket accessories AS A TOTAL PACKAGE that can change airflow and vary depending on a multiple of aftermarket accessories, to include headwind, tailwind, and stops. I have a bullet speed top, stock exhaust with a stock low ripper windscreen and have noticed no fumes after many rides and conditions. Awaiting a NASCAR style tallboy windscreen. I really don't anticipate issues. I'll keep posted.

  • Yep. Generally, on a vehicle, the wing will be upside down to generate down force, but may also increase drag while generating that down force, whereas a spoiler will be used to disrupt airflow and hopefully reduce drag. It can also be said that Wings will typically be in the airflow above or below the vehicle while a spoiler will closer to the vehicle body to reduce unwanted drag.