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Search took 0.01 seconds. Search: Posts Made By: tomi_k
Forum: EcoModding Central 06-28-2022, 10:52 AM
Replies: 92
Views: 9,662
Posted By tomi_k
Newbie on this area but modern ICE has all sort...

Newbie on this area but modern ICE has all sort of "circulating" loops (PCV, EVAP etc.) to burn fumes / vapors again so basic system is already available...

Reading topic......
Forum: Aerodynamics 06-14-2022, 02:12 PM
Replies: 1,307
Views: 163,556
Posted By tomi_k
Bio-mimetic Flow Control ...

Bio-mimetic Flow Control

https://higherlogicdownload.s3.amazonaws.com/APS/22d184d0-d6d2-4493-97da-847d341d3d82/UploadedImages/Documents/dfd09-choi.pdf
Forum: Aerodynamics 06-13-2022, 10:39 AM
Replies: 1,307
Views: 163,556
Posted By tomi_k
Thriving artificial underwater drag-reduction ...

Thriving artificial underwater drag-reduction
materials inspired from aquatic animals: progresses
and challenges :
https://pubs.rsc.org/en/content/articlepdf/2021/ra/d0ra08672j


Shark...
Forum: Aerodynamics 06-07-2022, 08:46 PM
Replies: 51
Views: 3,863
Posted By tomi_k
The Cd 0.158 shape start to look more or less...

The Cd 0.158 shape start to look more or less like Onorato's shape on page #4 on below publication....
...
Forum: Aerodynamics 11-03-2021, 10:37 AM
Replies: 80
Views: 25,244
Posted By tomi_k
Aerohead : Possible to get it, please?

Aerohead : Possible to get it, please?
Forum: Aerodynamics 11-01-2021, 08:59 AM
Replies: 42
Views: 6,726
Posted By tomi_k
Free to download: ...

Free to download:

https://www.researchgate.net/publication/226210472_Drag_and_lift_reduction_of_a_3D_bluff_body_using_flaps/link/0c960529736a2848ce000000/download
Forum: Aerodynamics 10-29-2021, 09:11 PM
Replies: 80
Views: 25,244
Posted By tomi_k
Anyone have following article: "Reduction of...

Anyone have following article:

"Reduction of base drag by boat-tailed afterbodies in low speed flow" by WA Mair, 1969 ?
Forum: Aerodynamics 10-29-2021, 06:16 PM
Replies: 636
Views: 442,766
Posted By tomi_k
BicycleBoB : The fins were a quick trial to...

BicycleBoB : The fins were a quick trial to reduce airflow wrapping around the box corner (towards the tail light "cavity / recess") based on tuft tests I did. I haven't found a good article what...
Forum: Aerodynamics 10-28-2021, 10:19 PM
Replies: 636
Views: 442,766
Posted By tomi_k
The idea of blending side surfaces with the top...

The idea of blending side surfaces with the top surface and meet at the of of the bed was to create that "smooth" transition over longer length to reduce vortex happening between the side and top...
Forum: Aerodynamics 10-28-2021, 10:04 PM
Replies: 636
Views: 442,766
Posted By tomi_k
Freebeard : I think I got it... most likely that...

Freebeard : I think I got it... most likely that is just a discontinuation of the duct tape which I placed from the very end of the cap (from pink foam) over the fin edge, in diagonal, which most...
Forum: Aerodynamics 10-27-2021, 09:11 PM
Replies: 636
Views: 442,766
Posted By tomi_k
Latest box with vertical fins... and changed top...

Latest box with vertical fins... and changed top surface... this is the one which I used on my latest record (11.20 liters / 100km)...

Fins will be moved few inches "out" (closer to the tail...
Forum: Aerodynamics 10-27-2021, 05:48 PM
Replies: 636
Views: 442,766
Posted By tomi_k
Aerohead : For the tailgate section.... something...

Aerohead : For the tailgate section.... something like that was under planning... simpliest way to start was to open the tailgate and build a box on top of it... After that is done to certain...
Forum: Aerodynamics 10-27-2021, 05:43 PM
Replies: 636
Views: 442,766
Posted By tomi_k
Thanks to all for compliments and encouraging...

Thanks to all for compliments and encouraging words... Head is full of ideas and there are more ideas than time to complete them, at the moment, but I tackle all big topics first... one by one.... ...
Forum: Aerodynamics 10-25-2021, 06:54 PM
Replies: 636
Views: 442,766
Posted By tomi_k
Freebeard : Plan was to use that as a fiber glass...

Freebeard : Plan was to use that as a fiber glass plug but we will see how it goes... reason for not "sealing" the surface yet is purely to see if other mods needs to be made.... and first want to...
Forum: Aerodynamics 10-25-2021, 06:48 PM
Replies: 636
Views: 442,766
Posted By tomi_k
11.20liters / 100km record was achieved with fins...

11.20liters / 100km record was achieved with fins on both sides of the tail box (not above picture)... it was a "quick" hack but basic idea was to reduce "vortices" around the tail lights as seen on...
Forum: Aerodynamics 10-24-2021, 06:36 PM
Replies: 636
Views: 442,766
Posted By tomi_k
Toyota Tundra 2011, 5.7litre (4x4): EPA (hwy) -...

Toyota Tundra 2011, 5.7litre (4x4): EPA (hwy) - 13.84liters / 100km (16.99mpg)

-Standard setup (no caps, no tonneau cover or any other mods): 13.8-14.2 liters / 100km, target speed of 110km/h.
...
Forum: Aerodynamics 10-23-2021, 05:25 PM
Replies: 636
Views: 442,766
Posted By tomi_k
This is first tuft test... ...

This is first tuft test...

https://ecomodder.com/forum/member-tomi_k-albums-toyota+tundra+2011-picture9039-20210905-183334-01.jpg
Forum: Aerodynamics 10-20-2021, 08:26 PM
Replies: 42
Views: 6,726
Posted By tomi_k
Aerohead : I guess you figured out that I posted...

Aerohead : I guess you figured out that I posted those pictures with the arrows which also had a mistake regarding the arrows not pointing perpendicular to the roof line, apologies for that.
I just...
Forum: Aerodynamics 10-16-2021, 11:10 AM
Replies: 6
Views: 1,097
Posted By tomi_k
https://autodesignmagazine.com/en/2020/01/gac-eno-...

https://autodesignmagazine.com/en/2020/01/gac-eno-146-designed-by-the-wind/

https://www.youtube.com/watch?v=fPvkK70t0f8

https://www.gac.com.cn/en/tech/concept
Forum: Aerodynamics 09-25-2021, 02:40 PM
Replies: 42
Views: 6,726
Posted By tomi_k
An attempt to questimate what happens DeltaCd...

An attempt to questimate what happens DeltaCd (min.) vs. slope angle (at min DeltaCd). with aft-body -ratio beyond of 0.45....
Forum: Aerodynamics 09-25-2021, 01:22 PM
Replies: 42
Views: 6,726
Posted By tomi_k
Thanks, Aerohead! I didn't see indication of a...

Thanks, Aerohead! I didn't see indication of a roof camber to be included into aft-body ration in the SAE 810185 but now when you mentioned, it makes sense.

Without roof camber :
* L0 / L -ratio...
Forum: Aerodynamics 09-24-2021, 05:34 PM
Replies: 42
Views: 6,726
Posted By tomi_k
Aerohead, thanks ! I think you are referring into...

Aerohead, thanks ! I think you are referring into Figure 14, on page 10 in the SAE 810185 (Fig, 14 - Influence of rear end slope inclination angle on drag coefficient).

My vehicle (pickup truck)...
Forum: Aerodynamics 09-24-2021, 04:40 PM
Replies: 42
Views: 6,726
Posted By tomi_k
Aerohead : What figure in the 810185 you are...

Aerohead : What figure in the 810185 you are referring into?
Forum: Aerodynamics 09-18-2021, 01:29 PM
Replies: 42
Views: 6,726
Posted By tomi_k
Thanks, Aerohead & Freebeard ! Just trying to get...

Thanks, Aerohead & Freebeard ! Just trying to get my head around the topic what matters the most... and learning. And thanks for being patient to respond (probably basic and silly questions) but...
Forum: Aerodynamics 09-17-2021, 05:48 PM
Replies: 42
Views: 6,726
Posted By tomi_k
Thanks for the respond, Aerohead. The...

Thanks for the respond, Aerohead.

The 18degree was a reference which I gathered from some of the Hucho's article and seems that the rear angle (whole rear end portion) somewhere between...
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