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Old 05-27-2013, 11:08 PM   #151 (permalink)
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garbage bag skin looks... garbage baggy

Tail update - yes, I'm still working on this!

I gave it 2 coats of oil-based paint. Then I started wrapping it in 3mil plastic on the weekend. To be honest, it looks like what it is: something wrapped in garbage bags! I had been hoping for better aesthetics, but the spray adhesive reacted with the plastic or oil paint, and it turned out wrinkly. Not sure if this plastic will shrink if heated, but I may try that.

Mostly, I've just adjusted my expectations!

I just keep reminding myself: this is a proof of concept; As much as it would be a bonus if it turned out pretty, I'm not going to spend a lot of time on finishing work.

Pics to come.

I'm going on a ~350 km trip next weekend, and this weatherproof cardboard tail will be on the car. If the weather cooperates, I'm expecting ~100 MPG (US) for the round trip, with a target cruising speed at the posted limit (80 km/h - 50 mph).

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Old 05-28-2013, 08:37 AM   #152 (permalink)
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350km? are you going through montreal ?
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Old 05-28-2013, 10:08 AM   #153 (permalink)
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Heading the other direction, actually! (Picton/Sandbanks)
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Ecodriving test: Manual vs. automatic transmission MPG showdown



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Old 05-28-2013, 02:03 PM   #154 (permalink)
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Quote:
Originally Posted by Xist View Post
You would attach those with cloth glue?
ZigZag tape comes as a self-adhesive tape.

It wouldn't be much trouble to reproduce it in cardboard and glue it on though
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Old 05-28-2013, 02:12 PM   #155 (permalink)
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Originally Posted by pascal28 View Post
Serrated nozzles on aircraft engines are for noise reduction. They have a slight efficiency penalty.
The old "lobed" nozzles reduced efficiency - i.e. 707 / DC-8 hush kits - along with noise.

But what I remember reading about the 787 serrated rear edges is that they improved efficiency ... while still cutting down noise and vibes.
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Old 05-28-2013, 02:15 PM   #156 (permalink)
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Quote:
Originally Posted by freebeard View Post
/silly vortex generators
They're not silly.

A simple strip of 1 to 1.5 mm high VGs undeniably changed the air flow pattern on Hägar's A pillar and side windows, quietening wind noise as well.
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Old 05-28-2013, 02:28 PM   #157 (permalink)
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Originally Posted by euromodder View Post
They're not silly.

A simple strip of 1 to 1.5 mm high VGs undeniably changed the air flow pattern on Hägar's A pillar and side windows, quietening wind noise as well.
Agreed !

I've seen several YouTube videos where they are placing vortex generators on airplane wings, and it makes them more efficient, especially considering the purpose: to keep flow from separating prematurely.

Jim.
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Old 05-28-2013, 02:41 PM   #158 (permalink)
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Quote:
Originally Posted by euromodder View Post
ZigZag tape comes as a self-adhesive tape.

It wouldn't be much trouble to reproduce it in cardboard and glue it on though
This has adhesive on it?
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Old 06-01-2013, 07:59 AM   #159 (permalink)
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I suspect zigzag tape would only "work" where there's laminar flow. It's just too thin, and the boundary layer is way too thick and turbulent over most of the car -- and getting worse the further back you go.

---

Plastic wrapped tail turned out not horrible!





A heat gun blowing all over the 3 mil plastic worked reasonably well to smooth it out. It was VERY wrinkly before -- even after trying hard to make it taut while laying it on the spray adhesive.

I'm leaving this AM for a long-ish weekend highway trip. Fingers crossed for the "big 100" ...
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Project MPGiata! Mods for getting 50+ MPG from a 1990 Miata
Honda mods: Ecomodding my $800 Honda Fit 5-speed beater
Mitsu mods: 70 MPG in my ecomodded, dirt cheap, 3-cylinder Mirage.
Ecodriving test: Manual vs. automatic transmission MPG showdown



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Old 06-01-2013, 10:11 AM   #160 (permalink)
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Safe travels!

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See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.



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