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Old 01-26-2023, 11:47 AM   #141 (permalink)
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Center top: Vortex Strakes



Downforce burns fuel. Lift also burns fuel.

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Old 01-26-2023, 04:58 PM   #142 (permalink)
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Actually the Tropfewagen's "fenders" are closer to what I had in mind.
https://ecomodder.com/forum/member-f...ture4984-a.jpg
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Old 01-26-2023, 06:53 PM   #143 (permalink)
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Variable pitch, disabled by the brakes?
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Old 01-26-2023, 07:15 PM   #144 (permalink)
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Quote:
Originally Posted by freebeard View Post
Variable pitch, disabled by the brakes?
adjustable(angle of attack).
I hadn't thought of changes demanded by brakes or acceleration...
more watching the MPG /HP demand from an Ultragauge to see if a change in the angle of attack made a change.

If the aerodynamic drag of this "lifting surface(s)" is greater than the benefit to RR, ... Jim Hall (Chaparral Racecars) I am not.

More curious though
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Old 02-02-2023, 04:16 PM   #145 (permalink)
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Quote:
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Welcome to Ecomodder.

Time is either speeding up or stretching out I don't remember the post at #10 at all.

I watched the video again and what stood out this time was the inflating mechanism standing proud of the sidewall. I proposed a design that has a rigid floor, but was to use a passive inflation system. Those scalloped openings are apparently overkill. More recently I considered retractable fiberglass rods.

Freebeard,
This "retractable/inflatable" boattail, what do you envision the rigid floor be made of?
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Old 02-02-2023, 05:44 PM   #146 (permalink)
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Terse: Polymetal/Dibond.

Verbose: Whatever they make difussers from, depending on whether it's a flat plate or complex as they tend to be,

You'll notice the pivot point is raised, such that as the floorplate deploys it swings down and forward to mate up to a rigid difusser.

Ignore the scalloped edge. That's depricated. I lean more toward fiberglass rods for bows, rather than inflatable.
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Old 02-03-2023, 06:34 PM   #147 (permalink)
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I lean more toward fiberglass rods for bows, rather than inflatable.
Fiberglass rods like for those "curved" in camping tents?...use like hoops on an articulated bus /conestoga wagon, straight sided & top with radius-ed corners....folds up accordion like.

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Old 03-25-2023, 04:11 PM   #148 (permalink)
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Something I’ve noticed on the commercial truck trailtail is a need of flexible cables to keep the folded panel in place(inward), not rods “pushing” the panel out.
Are the aerodynamic forces on a panel shaped like the “template”greater inward or outward? Or neutral?

Last edited by sregord; 03-25-2023 at 04:51 PM..
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Old 03-25-2023, 05:30 PM   #149 (permalink)
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The exterior of Thee Holy Template strives for neutrality.

A flat truncation is like a guppy mouth sucking on the wake.
Quote:
the folded panel in place(inward)
This is ambiguous (for me). Deployed versus non-deployed?
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Old 03-25-2023, 07:16 PM   #150 (permalink)
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Quote:
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The exterior of Thee Holy Template strives for neutrality.
Deployed versus non-deployed?
Does a "hybrid", starting with orbywan's fixed 3-5 foot, that I may add to, make sense? Having found proximity sensors that will warn of near collisions WAY BACK THERE. I'm becoming braver with the design. As you remember I'm starting with 32 foot, with a wag of 9 foot from the rear wheels.

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