Alfa Romeo Bulletin Board & Forums

Alfa Romeo Bulletin Board & Forums (https://www.alfabb.com/bb/forums/)
-   Limited Production (1960-1977) (https://www.alfabb.com/bb/forums/limited-production-1960-1977/)
-   -   Tipo 33 Stradale Replica Build (https://www.alfabb.com/bb/forums/limited-production-1960-1977/667120-tipo-33-stradale-replica-build.html)

punkt 08-21-2018 05:30 PM

Tipo 33 Stradale Replica Build
 
1 Attachment(s)
Alright, I'm doing it.

Chassis is going to be a steel spaceframe inspired by the "Locost" Lotus 7 Replica project. Suspension uprights, braking and steering components will be salvaged from a Miata. The transaxle will be a Subaru 5-speed unit. Engine can be anything really, but I would prefer it to be Alfa. I have access to a 2 liter Alfa engine (I've read that the first Tipo 33 prototypes had 1750 engines), or maybe I'll get a Busso V6. I'm probably not going to find an affordable Montreal V8. Hell, I could probably wedge a Ferrari/Maserati V8 in it if I really wanted to. I'm keeping that open for now.

The body will be carbon fiber. If all goes well with the buck and resulting molds, I will make more bodies to sell.

I've already designed the chassis, modeled the body, found a transmission (still need to pull it out of the donor car) and ordered steel, so this is happening. I'm waiting for a Miata to show up at a local salvage yard to get the rest of the chassis parts I need.

I'll update when i have something to update, in the meantime, enjoy this photo of a 1/10 scale body buck I made to make sure it looks "right"

horsewidower 08-22-2018 10:31 AM

I'm very interested in your project.

I just noticed, the other day, that Alfaholics (edit: oops, it was Classic Alfa, read on) is making a limited run of bodies. So it will be interesting to see how yours turns out.

Bob

punkt 08-22-2018 10:45 AM

Quote:

Originally Posted by horsewidower (Post 8305222)
I'm very interested in your project.

I just noticed, the other day, that Alfaholics is making a limited run of bodies. So it will be interesting to see how yours turns out.

Bob

Whoa, Alfaholics is going to make 33 Stradale bodies? Where did you see that, I couldn't find anything.

I wouldn't be shocked though.

Vivace 08-22-2018 11:44 AM

Quote:

Originally Posted by punkt (Post 8304904)
I've already designed the chassis, modeled the body, ...

I'm interested in how you designed the body. The steps, the tools, the software, the model. How are you building the molds for the body?

punkt 08-22-2018 12:01 PM

Quote:

Originally Posted by Vivace (Post 8305286)
I'm interested in how you designed the body. The steps, the tools, the software, the model. How are you building the molds for the body?

I found a complete set of drawings on this forum, with all of the various profiles for side, top, front, and back. I then stitched them together and scaled them in AutoCAD (software by AutoDesk), and I traced each and every form by hand in that software (mostly using the polyline tool). To make the 1/10 scale model, I added slots to each form to accept each perpendicular form, scaled them down to 10% of full scale, and I laser cut the forms out of 3mm basswood.

The full scale body would use the same forms that I traced, but at full scale. I will need to cut them out by hand, or use a CNC machine to cut them from plywood, and it will be assembled in much the same way as the model. Once the full size buck is assembled, the gaps between the forms will be filled in with expanding foam. Then begins the long process of carving, sanding, and applying a tooling gel coat to act as the surface. Once that is sanded and perfectly smooth, I'll take a fiberglass mold which will become the actual molds for making the new carbon fiber parts.

That's the idea anyway. This is going to be a learning experience for sure.

Vivace 08-22-2018 12:15 PM

Quote:

Originally Posted by punkt (Post 8305300)
To make the 1/10 scale model, I added slots to each form to accept each perpendicular form, scaled them down to 10% of full scale, and I laser cut the forms out of 3mm basswood.

This is similar to wooden boat "lofting" drawings - sections through the shape at spaced intervals.

Do you feel like you get any minor errors in tracing a line with a poly line? Just curious how much you have to blow it up to avoid errors.


This guy in Seattle, Adam Nonis, is a complete wizard at fabricating / molding / vac forming / shaping / altering / sewing / painting..... It's amazing. He built a cool Volvo 122 shell on top of a running BMW E30 chassis...just for fun.

https://forums.swedespeed.com/showth...n-build-thread

https://forums.swedespeed.com/showth...dQuarters-quot

punkt 08-22-2018 12:32 PM

Quote:

Originally Posted by Vivace (Post 8305306)
This is similar to wooden boat "lofting" drawings - sections through the shape at spaced intervals.

Do you feel like you get any minor errors in tracing a line with a poly line? Just curious how much you have to blow it up to avoid errors.


This guy in Seattle, Adam Nonis, is a complete wizard at fabricating / molding / vac forming / shaping / altering / sewing / painting..... It's amazing. He built a cool Volvo 122 shell on top of a running BMW E30 chassis...just for fun.

That's really amazing, thanks for the link!

Really the accuracy of the body comes down to how accurate the drawings are and how closely I follow them.

The first issue is I don't know who made the drawings or when. They could be original drawings from the mid 60's that were used to make the first bodies, or they could have been made many years afterwards. I just don't know. That's why I'm the 1/10 scale model to be sure that the shape at least looks correct, before I make a full size buck and realize that it is wrong.

I know my tracing isn't perfect, and I'm still tweaking problem areas and making finer tracings. I zoom way in to get as close to the line as possible, but at that zoom level you're sort of aiming at the center of a few grey pixels to determine where the line really is. Even if it is off, its only off by probably one or two millimeters, which I don't think would be visible as long as it is smooth and even.

Vivace 08-22-2018 01:01 PM

Quote:

Originally Posted by horsewidower (Post 8305222)
Alfaholics is making a limited run of bodies

I can't find anything on their website either.

Vivace 08-22-2018 01:04 PM

Quote:

Originally Posted by punkt (Post 8305312)
I zoom way in to get as close to the line as possible, but at that zoom level you're sort of aiming at the center of a few grey pixels to determine where the line really is. Even if it is off, its only off by probably one or two millimeters, which I don't think would be visible as long as it is smooth and even.

Wow, yeah, that's zoomed! So, similar to boats again - make sure the line or surface is "faired" to the eye, and the numbers don't matter anymore.

This looks fun!

horsewidower 08-22-2018 01:44 PM

For the life of me, I can't find the article. I'll keep looking.

It had a cost of 16K pounds and they were working with various chassis manufacturers. I wish I had marked the article.

Hans-Peter 08-22-2018 01:49 PM

Classic Alfa in the UK is making the 33 bodies, also chassis are available , they have them up and running.

Hans-Peter 08-22-2018 01:52 PM


punkt 08-22-2018 01:57 PM

Wow, that is very interesting. That is the first I've seen of an actual reproduction body.

Vivace 08-22-2018 02:18 PM


horsewidower 08-22-2018 02:55 PM

Quote:

Originally Posted by Hans-Peter (Post 8305348)
Classic Alfa in the UK is making the 33 bodies, also chassis are available , they have them up and running.

Yep, there it is. Had my vendor wrong. Thanks, I thought I'd lost my mind.


All times are GMT -7. The time now is 03:36 PM.

Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
User Alert System provided by Advanced User Tagging (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Copyright 2002-2011 AlfaBB.com All Rights Reserved.

 
For the best viewing experience please update your browser to Google Chrome