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Good basic assessment of rear wing considerations

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Good basic assessment of rear wing considerations

Postby grant » Mon Apr 24, 2017 8:08 pm

I love youtube for this kind of stuff. And he has a Cayman as an example. Hadn't considered interaction between wing and rear diffuser. Had always thought of the two working independently. Trick is getting enough down force in front to offset rear. I may need to go with canards in addition to my new splitter. Have to check XP to see if I can run canards.

https://www.youtube.com/watch?v=H8EX_ZcrdxA
2010 Cayman S - Elsa
2015 Boxster S - Pearl
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Re: Good basic assessment of rear wing considerations

Postby Bill C » Mon Apr 24, 2017 10:51 pm

Seem like the biggest worry you would have is having the low pressure from the bottom of the wing applied to the rear deck under it. There must be some rule of thumb as to how far that low pressure area extends below the wing. Are you going to have a wing for the tour?
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Re: Good basic assessment of rear wing considerations

Postby grant » Mon Apr 24, 2017 11:35 pm

Bill C wrote:Seem like the biggest worry you would have is having the low pressure from the bottom of the wing applied to the rear deck under it. There must be some rule of thumb as to how far that low pressure area extends below the wing. Are you going to have a wing for the tour?


Ive been swamped. Ill be lucky to get new tires mounted and new lightweight exhaust on the car. Wing arrives later this week and then I need to make mounts so doubtful
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Re: Good basic assessment of rear wing considerations

Postby Mark G » Wed Apr 26, 2017 11:41 pm

That same fellow talks about canards / dive planes, and they seem to be a wash

https://www.youtube.com/watch?v=aCXTVpj1Ci4

but canards are legal in XP

http://cdn.growassets.net/user_files/sc ... 1491322179

PREPARED CATEGORY
X Prepared (XP)
180 — 2017 SCCA® National Solo® Rules
Prepared (XP) - Appendix A

Canards are allowed and may extend a maximum of 6” (15.24 cm) forward
of front bodywork/fascia as viewed from above. No portion of the
canard may extend past the widest part of the front bodywork/fascia
as viewed from above. Canard area will be measured in the same manner
as wings using Section 12.10. Canard area may not exceed 1.2 sq.
ft. (1114.8 cm²).
Front splitters are allowed and shall be installed parallel to the ground
(within ±3° fore and aft) and may extend a maximum of 6” (15.24 cm)
forward of the frond bodywork/fascia as viewed from above. Splitters
may not extend rearward past the centerline of the front wheels. No
portion of the splitter may extend beyond the widest part of the front
bumper as viewed from above.
The splitter and canards may have endplates. The endplates may connect
the splitter and the canard. The splitter and canard endplate total surface
area is limited to 100 sq. in. (645.2 cm2) for each side
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Re: Good basic assessment of rear wing considerations

Postby grant » Thu Apr 27, 2017 4:38 am

Yes canards planned. I went with cheap Bolt on splitter. Remove stock chin spoilers and this bolts in. Not overly aggressive but should help a little.

Image

Found this wing with end plates and tall aluminum mounts for $400 with free shipping ...gotta love Amazon. Decent quality and looks efficient. Need to fab some pieces that mout to chassis.

Image
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Re: Good basic assessment of rear wing considerations

Postby Bill C » Thu Apr 27, 2017 5:00 pm

Grreat buy on the wing!!!!!! It can't be C/F for that price. How much does it weigh? Hurry up and mount that thing! We're in the last run group this weekend, so there is plenty of time! :D
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Re: Good basic assessment of rear wing considerations

Postby grant » Thu Apr 27, 2017 8:56 pm

Bill C wrote:Grreat buy on the wing!!!!!! It can't be C/F for that price. How much does it weigh? Hurry up and mount that thing! We're in the last run group this weekend, so there is plenty of time! :D

Well its lightweight fiberglass with CF top weave but its very well made and entire setup is under 10 lbs. My bigger concerns with cheap wings is ability to hold up when at higher speeds and overall aerodynamic efficiency. This is a very stout wing that is very high quality. Quality is up there with Getty. I want to do mounting right and likely means welding some tabs to chassis.
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