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Old 04-23-2013, 05:36 PM   #81 (permalink)
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Great result! Congrats! I wish I could build a boat tail for Berta... But that's impossible here in Poland.

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Old 04-23-2013, 05:37 PM   #82 (permalink)
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I bet an aero trailer isn't.
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Old 04-23-2013, 05:38 PM   #83 (permalink)
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Bloody good job!! Thanks for sharing the results of such a rigorous test!

What was the distance travelled in your runs?

Also, do you think it is worth filming a tuft test on the underside of the boat-tail? It would be great to get some test support on what angle works there.
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Old 04-23-2013, 05:39 PM   #84 (permalink)
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Excellent work!
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Old 04-23-2013, 05:48 PM   #85 (permalink)
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Hi, Pascal: test route is straight, level and 1.6 km/1 mile "at speed" (not counting the distance used to get up to speed & level off, coast down and turn around etc). You can see the section of road I use here: along the shore of the mighty and lovely St Lawrence River, immediately to the southwest of where that map link is centered.

----

I plan to tuft test the bottom of the tail. The car needs a full belly pan for the bottom of the tail to work well. I'm sure it's in very turbulent flow now, but a full undertray will feed it some cleaner flow to work with. It's on the list!
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Old 04-24-2013, 12:06 AM   #86 (permalink)
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Very nice! Glad to see the work paid off with great results!
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Old 04-24-2013, 01:57 AM   #87 (permalink)
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Your cardboard skills are on another level! Looks so amazing!

Decided to take a brake from my Vanagon project to check out some eco love!

Let me know if you want coroplast. Also near the top it was mentioned Aluminum composite panel would be a good product to make this out of. I have some ok sized scraps laying around you can have if you want to see what the properties are like.

Msg me if you need a camera man to follow you! Would be happy to help out.
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Old 04-24-2013, 02:46 AM   #88 (permalink)
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OUTSTANDING JOB, MetroMPG!!!!! I was all happy & proud of myself after filling up the White Gnat and seeing my first 54 mpg tank, but is that really 109 mpg you got with the boattail? - in "non-hybrid mode"?!?!?! Whoa - I gotta git me a first gen Insight!!!!!!

Again, WELL DONE!!!!
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Old 04-24-2013, 08:43 AM   #89 (permalink)
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Interesting. I also looked at some quick and simple approach, but I also suffer from TMP. My only criticism is that I don't think I'd give away the improvement achievable from smoothing out the tail light area by relocating them, like you did on the metro. I think you will regret doing that. It isn't really all that hard to do. all you have to do is use a trailer harness with snap on taps just inside the hatch wiring.

I'm glad you aren't looking for the 15% you got on the Metro because I strongly suspect it isn't there on the Insight. The Cd is already too good.
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Old 04-24-2013, 09:50 AM   #90 (permalink)
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Quote:
Originally Posted by pRoy View Post
Decided to take a brake from my Vanagon project to check out some eco love!
Hey pRoy.... thanks for the offer to film. I need to keep that in the back of my mind. I sent you an e-mail on other topics.

Quote:
Originally Posted by wmjinman View Post
is that really 109 mpg you got with the boattail? - in "non-hybrid mode"?!?!?!
Yup - that's the beauty of light weight + good aero + tall gearing + the secret weapon: LEAN BURN.

Quote:
Originally Posted by jime57 View Post
My only criticism is that I don't think I'd give away the improvement achievable from smoothing out the tail light area by relocating them, like you did on the metro. I think you will regret doing that. It isn't really all that hard to do. all you have to do is use a trailer harness with snap on taps just inside the hatch wiring.
No trailer harness or extra lights on hand made that approach less quick & less simple. The future better (and more complicated) version of the tail will take that approach though. Until then, I can happily live with ~10% better highway MPG.

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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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