CF Mohawk Scoop without roof panels - Page 2 - LotusTalk - The Lotus Cars Community
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post #21 of 84 (permalink) Old 08-12-2018, 04:56 AM Thread Starter
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Top of OEM roof buck removed.
Next step is to shape the H top.

I have a request from Kneffel for a single skin lightweight top either in FG or CF without any fastening attachment for us DIY types.

Are there any others interested in such an item?
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post #22 of 84 (permalink) Old 08-26-2018, 10:11 AM Thread Starter
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Update on my CF roof scoop project.

The roof molds shown in photos below from my OEM roof has been coated with a grey epoxy and refinished, new roofs in FB or CF will be fabricated from this latest refined mold.

Anyone who wants a single or double FB or CF roof please contact me via PM.
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post #23 of 84 (permalink) Old 09-02-2018, 07:15 AM Thread Starter
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Progress report:

Here are the latest pictures of the analogs pulled from the initial mold (grey in last post) from my OEM top.

These analogs (white) compose of both the top and bottom halves as seen in the photos being check for fit to my car.

Both of these analogs are then trimmed and adjusted for fit and proper gap relative to the A and B pillars.
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post #24 of 84 (permalink) Old 09-02-2018, 07:36 AM Thread Starter
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Both of these analogs are then indexed to the car and then fixed to wooden supports to prevent distortion; next, the outer surface will be filled with Bondo, primed, block sanded, and polished before being used to make the final mold.

For those who are interested in the single outer layer only and a complete CF or FG top please PM me about the details.
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post #25 of 84 (permalink) Old 09-06-2018, 01:19 PM Thread Starter
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A midweek update from your fellow humble LT member on my CF top project:

Here are the "plugs" which are the final analogs of my OEM roof top and bottom halves. Each half is reinforced on the back side with balsa wood to maintain it's final 3D shape relative to my car. These two halves will be further refined, refitted to my car, primed, block sanded - checked for uniformity, and then wet-sanded, polished and the final mold with an added flange will be made from these plugs. Once the final molds are made, all future roofs or parts will be made from them for perpetuity.
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Last edited by senna's daddy; 09-06-2018 at 01:26 PM.
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post #26 of 84 (permalink) Old 09-07-2018, 12:03 AM Thread Starter
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Top "plug" in primer.
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post #27 of 84 (permalink) Old 09-09-2018, 10:51 AM Thread Starter
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Following are the latest photos for those who are interested, here is the "plug" in its final finished form, it's been properly gapped at the A and B pillars, fitted to my car, fine sanded, and polished to a sheen. Next step is to make the final mold from this plug.
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post #28 of 84 (permalink) Old 09-09-2018, 12:03 PM Thread Starter
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More photos from today.
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post #29 of 84 (permalink) Old 09-17-2018, 09:19 AM Thread Starter
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More refinement has been done to the first top (grey), some areas will be improved like the rectangular area for the mounting at the B-pillar, we have decided to modify the rectangular pad's hard-edged shape to a smooth gradual transition to the interior contours (blue = mold). Brown = flange on the mold for proper indexing of the halves.
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post #30 of 84 (permalink) Old 09-17-2018, 09:21 AM Thread Starter
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For my open cockpit version, we may modify the shape of the scoop to be taller and narrower like the Kobayashi black car below.
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post #31 of 84 (permalink) Old 10-06-2018, 09:47 AM Thread Starter
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Sorry guys, I've been busy, I'm on Oahu for a month.
Here are the latest pics from a few weeks ago.


The molds were modified in specific areas to make the transitions smoother with Bondo so the final top will bind less to the mold due to the sharp angles, and it will also look nicer.
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post #32 of 84 (permalink) Old 10-06-2018, 09:50 AM Thread Starter
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Here's the first FG top and bottom pulled from the mold, it's being test fitted to my car - the wood is used to keep the FG from flexing.
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post #33 of 84 (permalink) Old 10-07-2018, 07:58 AM Thread Starter
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To answer Rainmaker's question regarding the design of the movable roof panels:

Here's my proposed design, the hinge for the panel(s) will be at the A-pillar so the air pressure will naturally keep it closed at speed. The panel will be secured at the B-pillar support with neodymium magnets, and all the contours will follow the factory top.

An option could be a clear polycarbonate panel for those who don't mind additional solar heat gain.

The cost will be around $4K.
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post #34 of 84 (permalink) Old 10-10-2018, 09:05 PM
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Garage
can you make something for the evora?
- full cf front hood ?
thanks

2014 Evora (NA) / MT / 2-0
BOE Chargecooler Series (FUTURE)
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post #35 of 84 (permalink) Old 10-11-2018, 05:06 AM Thread Starter
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Originally Posted by phenoyz View Post
can you make something for the evora?
- full cf front hood ?
thanks
Anything is possible, I'll need a donor hood for the mold fabrication process for at least a month, and money to cover the cost to make the mold and for each individual hood that will be made from this mold.
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post #36 of 84 (permalink) Old 10-11-2018, 11:43 AM
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For my open cockpit version, we may modify the shape of the scoop to be taller and narrower like the Kobayashi black car below.
Like my tests showed, that would give us more efficient ic cooling. The best would be to avoid the boundary layer at all.
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post #37 of 84 (permalink) Old 10-11-2018, 12:18 PM
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I think the fun part of having the 'scoop only' would be to make it so it fits in the trunk

The scoop will[I tried]

My thought would be to find a moth eaten soft top and cut it in half[!] to create a kind of drizzle proof, sun blocking, a/c retaining piece that you could travel with.

It would be pretty difficult to make a monsoon proof three part top, so why bother? More of a I got caught in the rain and my new girlfriend will be my ex girlfriend if we have to drive home this way kind of top

I mean old guys with TR2s and XK120s stayed married after all....
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post #38 of 84 (permalink) Old 10-11-2018, 01:04 PM Thread Starter
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Originally Posted by exigegus View Post
I think the fun part of having the 'scoop only' would be to make it so it fits in the trunk

The scoop will[I tried]

My thought would be to find a moth eaten soft top and cut it in half[!] to create a kind of drizzle proof, sun blocking, a/c retaining piece that you could travel with.

It would be pretty difficult to make a monsoon proof three part top, so why bother? More of a I got caught in the rain and my new girlfriend will be my ex girlfriend if we have to drive home this way kind of top

I mean old guys with TR2s and XK120s stayed married after all....
Great minds think alike, the CF piece will have a slight kick on the leading edge atop the A-pillar that will move the air up and over the open cockpit much like a F1 car; so even if it rains the cockpit will stay dry as long as you're at speed.

Because I'm using an H shaped design to optimize the structural rigidity, so the two legs of the H will be the same width as the A and B pillars - sadly this will not fit in our petite booty bin.
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post #39 of 84 (permalink) Old 10-11-2018, 01:09 PM Thread Starter
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Like my tests showed, that would give us more efficient ic cooling. The best would be to avoid the boundary layer at all.
Please give me a link to your study, my friend is a backyard aerodynamicist; as he has made his Rutan the slipperiest Long EZ by all sorts of aero mods like closing down the intake duct size and changing the profile of his fairings and wing.
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post #40 of 84 (permalink) Old 10-11-2018, 01:49 PM
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Please give me a link to your study, my friend is a backyard aerodynamicist; as he has made his Rutan the slipperiest Long EZ by all sorts of aero mods like closing down the intake duct size and changing the profile of his fairings and wing.
I wouldn't call it a study, but i did take some measurement, i wanted to go further but had no occasions yet, plus i'm waiting for winter temps to come.
Btw here it is, i'd really like to know your friend thougts.

https://www.lotustalk.com/forums/f15...18/index2.html

And this is what i'd like to realize

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