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Old 03-05-2016, 01:29 PM   #31 (permalink)
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Cda test request for a 91 Dodge"brick" Ram

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

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1st gen cummins 91.5 dodge d250 ,HX35W/12/6 QSV
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best tank: distance 649gps mi 24.04 mpg 27.011usg
Best mpg : 31.32mpg 100mi 3.193 USG 5/2/20


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'79 Chevy K20 4X4 350ci 400hp msd custom th400 /np205. 7.5-new 14mpg modded befor modding was a thing
87' Hyundai Excel
83 ranger w/87 2.9 L FI2wd auto 18mpg on the floor
04 Mitsubishi Gallant 2.4L auto 26mpg
06 Subaru Forrester XT(WRX PACKAGE) MT AWD Turbocharged 18 plying dirty best of 26mpg@70mph
95Chevy Blazer 4x4 auto 14-18mpg
04 Chevy Blazer 4x4 auto 16-22mpg


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Old 03-08-2016, 04:52 PM   #32 (permalink)
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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.
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Old 03-09-2016, 06:19 AM   #33 (permalink)
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little jona - '91 Dodge D 250 first gen cummins LE
Team Streamliner
90 day: 23.4 mpg (US)

Little Jona airo modded - '91 Dodge RAM 3/4 TON D 250 2×4 AUTO
Pickups
Team Cummins
90 day: 18.5 mpg (US)

The Salted Hound Jenny. - '87 Dodge Ram 50/D-50 5sp 4X4
90 day: 20.24 mpg (US)

Jona Allison aero - '91 Dodge Ram D-250 Le
90 day: 20.91 mpg (US)
Thanks: 208
Thanked 419 Times in 272 Posts
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??
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1st gen cummins 91.5 dodge d250 ,HX35W/12/6 QSV
ehxsost manafulld wrap, Aero Tonto
best tank: distance 649gps mi 24.04 mpg 27.011usg
Best mpg : 31.32mpg 100mi 3.193 USG 5/2/20


Former
'83 GMC S-15 Jimmy 2door 2wd O/D auto 3.73R&P
'79 Chevy K20 4X4 350ci 400hp msd custom th400 /np205. 7.5-new 14mpg modded befor modding was a thing
87' Hyundai Excel
83 ranger w/87 2.9 L FI2wd auto 18mpg on the floor
04 Mitsubishi Gallant 2.4L auto 26mpg
06 Subaru Forrester XT(WRX PACKAGE) MT AWD Turbocharged 18 plying dirty best of 26mpg@70mph
95Chevy Blazer 4x4 auto 14-18mpg
04 Chevy Blazer 4x4 auto 16-22mpg


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Old 03-09-2016, 02:44 PM   #34 (permalink)
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Quote:
Sorhat I can so my % gain on Cd from down hill cost down testing mpgs...
This part makes my head hurt.
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Old 03-09-2016, 10:24 PM   #35 (permalink)
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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!
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Old 03-12-2016, 01:48 PM   #36 (permalink)
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viscosity

Quote:
Originally Posted by freebeard View Post
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.
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Old 03-12-2016, 01:54 PM   #37 (permalink)
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CdA

Quote:
Originally Posted by gumby79 View Post
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.
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Old 03-12-2016, 02:09 PM   #38 (permalink)
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27% fe

Quote:
Originally Posted by gumby79 View Post
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.
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Old 03-12-2016, 02:13 PM   #39 (permalink)
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reduction

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Originally Posted by rumdog View Post
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.
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Old 03-12-2016, 10:37 PM   #40 (permalink)
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little jona - '91 Dodge D 250 first gen cummins LE
Team Streamliner
90 day: 23.4 mpg (US)

Little Jona airo modded - '91 Dodge RAM 3/4 TON D 250 2×4 AUTO
Pickups
Team Cummins
90 day: 18.5 mpg (US)

The Salted Hound Jenny. - '87 Dodge Ram 50/D-50 5sp 4X4
90 day: 20.24 mpg (US)

Jona Allison aero - '91 Dodge Ram D-250 Le
90 day: 20.91 mpg (US)
Thanks: 208
Thanked 419 Times in 272 Posts
Questions

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

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