Automotive Aerodynamics (video series)

[gumby79]

Helow
[QUOTE=graysgarage;474540]Hey everyone,

Thank you for the feedback. I'm new to making videos and am still learning how to best shoot, edit, and present the information.

If anyone has models they would like to send me, anything in the 1:18-1:10 scale please send me an email.

I just purchased the only model for a 73-93 Dodge PU 1:43 scale. You said larger 1:18 to 1:10 is preferred, However, in the old stack of bricks design Dodge 1;43 is all i could find. The new trucks are every where in the proper scale


http://rover.ebay.com/rover/0/e11070...xe=exe,ext=ext
Also, if anyone has questions or specific requests, please email me have you added the link for this.?. You can find all my info on my website graysgarage.ca good info hear thank you

I don't check forums very often, so this is the best way to reach me.
you tube didn't get a response Eather
Thank you for the support!

My hope is that i can buld an accurate 1;43 removable canipè. To sind with the truck. For TESTING will pm you for an address to sind to

[freebeard]

1/24th is headed the wrong way. 1/3rd to 1/5th is best-er.

OP most recent post is still the solicitation at Permalink #29. Perhaps aerohead could suggest whether a fluid with less viscosity like rubbing alcohol or more viscosity like melted coconut oil would be better at 1/43rd scale.

[gumby79]

Was hopeful that my body type and year range could have its Cd info populated the newer dodge is available in 1:10 '73-'93 body I have only ben able to find in 1:43.
In one ofvhis videos he was able to 3D print a model that was not available.
Can anyone find the stock. Cd. CdA ect. Ect. For a '91 dodge D250. Sorhat I can so my % gain on Cd from down hill cost down testing mpgs show 27% FE improvement =54% improvement in drag reduction
What do you guys/gals think??

[freebeard]

Sorhat I can so my % gain on Cd from down hill cost down testing mpgs...

This part makes my head hurt.

[rumdog]

Ha me too freebeard i was making a funny face trying to decifer it.
54% geez thats a big drop in drag. My cap is a similar shape, i was guessing 1/4 to 1/3 reduction in drag, but would be happy to be wrong!

[aerohead]

Originally Posted by freebeard

1/24th is headed the wrong way. 1/3rd to 1/5th is best-er.

OP most recent post is still the solicitation at Permalink #29. Perhaps aerohead could suggest whether a fluid with less viscosity like rubbing alcohol or more viscosity like melted coconut oil would be better at 1/43rd scale.

We'd need a kinematic viscosity in order to calculate the Reynolds number,and from that determine the flow velocity to generate the critical Reynolds number based upon the scale of the model.
Texas Tech used as small as 1/24-scale in their water tunnel.
At very small scale we risk cavitation as low local pressures force a phase change in the working fluid.

[aerohead]

Originally Posted by gumby79

Was hopeful that my body type and year range could have its Cd info populated the newer dodge is available in 1:10 '73-'93 body I have only ben able to find in 1:43.
In one ofvhis videos he was able to 3D print a model that was not available.
Can anyone find the stock. Cd. CdA ect. Ect. For a '91 dodge D250. Sorhat I can so my % gain on Cd from down hill cost down testing mpgs show 27% FE improvement =54% improvement in drag reduction
What do you guys/gals think??

I don't know if the data has been offered.
The D-100 1/2-tons were around 31.5 sq-ft frontal area.
I'd estimate the Cd at around 0.525.

[aerohead]

Originally Posted by gumby79

Was hopeful that my body type and year range could have its Cd info populated the newer dodge is available in 1:10 '73-'93 body I have only ben able to find in 1:43.
In one ofvhis videos he was able to 3D print a model that was not available.
Can anyone find the stock. Cd. CdA ect. Ect. For a '91 dodge D250. Sorhat I can so my % gain on Cd from down hill cost down testing mpgs show 27% FE improvement =54% improvement in drag reduction
What do you guys/gals think??

Hucho shows a different CdA/MPG relationship for Diesels compared to gasoline vehicles.I don't have his book with me.Perhaps a member can help us out on this one.
These relationships are predicated upon steady-state highway cruise mpg,not coasting or coastdowns.
Also,we have no idea what the engines BSFC is doing with the modifications,and all the relationships presume a constant BSFC,or gear-matching to achieve a constant BSFC which may not reflect reality.

[aerohead]

Originally Posted by rumdog

Ha me too freebeard i was making a funny face trying to decifer it.
54% geez thats a big drop in drag. My cap is a similar shape, i was guessing 1/4 to 1/3 reduction in drag, but would be happy to be wrong!

So far,I think that 20-21% drag reduction maximums have been reported for caps.

[gumby79]

Sorhat (so that)I can so my(find my) % gain on Cd from down hill cost down testing(turmnal velocity testing instead of) mpgs... (improvement for drag improvement value)
This part makes my head hurt.
Sorry temporary tourettes