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Learning how to build Lotus Seven replicas...together!
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PostPosted: Sun Jun 22, 2008 9:45 am 
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What are you doing with the scooter? Do you want this split into a seperate topic?

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PostPosted: Sun Jun 22, 2008 10:25 am 
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Yess, yes, yes...Tell us more!

-dave

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PostPosted: Sun Jun 22, 2008 12:37 pm 
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Miatav8,MstrASE,A&P,F wrote:


Pretty cool stuff, but this one bothers me. Seems a great way to neatly remove your head from your body in even a low speed accident...

Image[/url]

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PostPosted: Sun Jun 22, 2008 12:46 pm 
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It would seem to me that the rear fairing could come up to "helmet top level" and complete the effect.

Something I read once about the impact of streamlining was a "tin can shaped" beacon on top of the vertical stabilizer of a small cessna 150 (about 4' high) had as much drag as the whole rest of the vertical stab.


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PostPosted: Sat Jul 05, 2008 10:12 am 
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Okay, a little update.

I was going to make a whole new front end that was aero instead of trying to use the original front end. However, once the front was aero, the back did not match at all. I like the back end so I'm going with plan B but this is how I was working plan A.

I hot glued the fan-folded, thin, blue, polystyrene foam. This foam has writing on one side and a plastic film on the other. The film will keep the polyester resin off of the foam. Otherwise, it will dissolve the foam.

Any cuts will allow resin to contact the foam. The shiny side of duct tape will not stick to polyester resin.

The goal of this is not to make a finished part, but to quickly rough shape the plug for the mold to be made from. This one took about an hour. A final part made in this particular way would be very heavy once filler is added to smooth the contours. The polyiso foam used in the seat back doesn't bend at all. I would not have been able to make the curves without using a block of it and sanding them in.

Notice the many cuts in the foam. These allow the foam to make the twists and bends. The cuts should be made on the side facing out, using a sharp razor to cut approximately halfway through the foam. You need a box of razors from someplace like McMaster to do a project like this. A dull razor will not cut foam cleanly. I find it easy to do quickly with the razor held between the thumb and index finger where the razor's edge just protrudes past the fingernails. Pre-crack the foam at the cuts before placing on the form. For a compound curve, the cuts should be half way between the two bends (i.e. if the curve axis are perpendicular to each other, the cut would be at 45 degrees to either axis, basically an X).

In hindsight, I should have used 2" wide stringers parallel to the ground, then cut them at whatever angle necessary. The final shape would have been much better.

There is a sheet of painters plastic that was taped over the windscreen to prevent the resin from damaging it. I should have made a foam template to bolt to the windscreen mounts instead of leaving the windscreen inplace.

The white styrofoam block was against the front of the tire.

The fairing is very wide at the bottom for tire clearance when turning. Much of the bottom would have to be cut away for ground clearance when leaning. A separate fairing could have been made that bolts to the rigid fork tubes near the wheel. This would allow a very narrow, tire hugging fairing. FYI, the Helix uses a front trailing arm suspension with separate shocks.

The seat back was not vacuum bagged. It is two layers of polyiso and two layers of fiberglass. The complete seat back with piano hinge, latch, foam, upholstery, etc weighs 1 lb, according to my bathroom scale with me and the seat back versus just me. The tapering is performed with a rough razor cut, followed by very light sanding with drywall sanding screen to feather the edges and fully radius any corners. Glass does not go around 90 degree corners unless it is bagged. The glass is draped/stretched/fitted perfectly before any resin is applied. Then resin is gently applied with a 1" paint brush to keep from moving the glass around as it fills the weave. Only enough resin is applied to fill the weave. Anything extra adds weight. Any edges should wrap around atleast 2 inches or lay flat 2 inches past the last curve.

I use painters plastic on a table duct taped at the edges. I glassed the big piece first, with enough material to wrap around the back. Once I glassed one side, I carefully flipped it over, laying the wet glass on the plastic while I wetted out the wrap around. If you do any fiberglassing, get a box of latex gloves. A box of 100 is around $7. Put on a new pair everytime you are about to mix resin.

The strip of wood in the edge is a piece of plywood for the screws to bite into. The latch clip at the top is screwed into glass/foam only. It seems plenty strong enough for that, but I could route out that area and glass in a piece of wood flush with the surface. The surrounding area would need to be sanded until dull. The glass should extend out 2 inches all around. The wood and cavity would be wetted out with resin before sticking the wood into the cavity.

Prefit everything before picking up the resin. Regular scissors trim wet glass easily. Minimize over hangs, because the weight of them will lift the edges of the curing glass the moment you turn your back on it.

For polyester, use the least amount of catalyst to provide maximum time to apply all of the resin you've mixed and work the part. The only way to use the least amount of catalyst is to accurately measure the catalyst. Buy a bottle of MEK, not those tiny squeeze bottles. Veterinary syringes are perfect. They fit into the neck of the bottle. The catalyst (MEK) attacks the rubber plunger, tinting the mek in the bottle, but the cure is unaffected.

Velcro is very expensive. Buy "hook and loop" fasteners with adhesive backing by the roll. $11 for 25 yards of 1" hook and $11 for 25 yards of 1" loop is a good deal.
http://www.buyhookandloop.com/All.asp

The adhesive sticks to the glass well. Sew the hooks to the vinyl, place the loops on the hooks, peel the plastic to expose the adhesive on the loops, then pull the vinyl tight and stick the loops onto the glass.

Be sure to use thread that is the same color as the material.

The windscreen mounts are 1/2" tube tacked in for now. The handle bar is 3/4". I used 1" dom because I had it laying around. I should have cut it length wise to make it 3/4. I may do that later. The flanges on the original bodywork had to be cut off because they were in the way.


Last edited by Miatav8,MstrASE,A&P,F on Tue Sep 16, 2008 1:53 pm, edited 1 time in total.

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PostPosted: Sat Jul 05, 2008 10:01 pm 
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Hey, thanks for the great write-up, MstrASE. Great stuff...someday I'll have to give fiberglass work a try. I'll be eager to read more on your project.

-dave

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Visit my [Locost 7 build log]


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PostPosted: Sun Jul 13, 2008 4:49 pm 
COOL I think you scooter has nearly the same trunk space my Solstice has.


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 Post subject: Fairing
PostPosted: Sun Jul 27, 2008 11:17 pm 
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What are you using after the fibergalss to smooth it up ? I'm having a bear of a time fairing with epoxy and microballoons . So hard to get the parts smooth again after.


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PostPosted: Sat Aug 02, 2008 10:11 pm 
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Miatav8,MstrASE,A&P,F wrote:
Here is an interesting comparison of a reasonable person's "race" on the Autobagn, between a Monotracer, which is an enclosed motorcycle with landing gear and 2 occupants, a Hyabusa, and a Corvette. The bike never stopped for fuel where the others stopped several times. The video is long and in German. The Busa could have been equipped with a larger tank, but if you ride sport bikes, you know a fuel stop is an excellent opportunity to get off of the thing.

http://www.kabeleins.de/auto/videos/dre ... kel/15457/


The Monotracer is AMAZING. Better than 55mpg, 0-60 <6 seconds, top speed >150mph. The base price of 52,500 euros (US$82k) makes it extremely ripe for a cheap knockoff. Here's the manufacturer's website for those who may be interested.

http://www.monotracer.com/?page=main&lang=en

Since first seeing the video, I've been very intrigued by it, as well as by Robert Q. Riley's three wheeler. Thanks for posting.

The scooter's looking great. I am eager to see the finished product and how it works out for you WRT fuel economy, comfort at freeway speeds, etc.


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PostPosted: Sun Aug 03, 2008 1:35 pm 
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Miatav8,MstrASE,A&P,F wrote:
Also, cvt drives are high friction and one can't squeeze the clutch to coast.


Yeah...that about the only annoyance of our Vino 125...no coasting. I'm sure our mileage would be (trivially) better with a clutch or neutral. But mostly, it's just annoying.

-dave

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...nowadays people are so intellectually lazy and lethargic that they can't build ANYTHING with their hands. They'll spend hours watching whiny people marooned on an island, but won't spend a second adding anything to the world. -weconway
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PostPosted: Sun Aug 03, 2008 3:09 pm 
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Dont know if you seen this Miatav8, but its got a bunch of these thingees :-)

http://www.voidstar.com/bff/machines.html


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PostPosted: Sun Aug 03, 2008 7:38 pm 
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Miatav8,MstrASE,A&P,F wrote:
I was on a waiting list for 6 months when the Vino 125 came out. My boss just bought a Burgman 400. I think thats the perfect size for a scooter.


Yeah, we're thinking of getting a second scoot...we both prefer the Vino to any of our cars. (completed cars, that is!!!) The Burgman 400 looks real nice...certainly highway capable. Also looking at the 250's, which are probably good enough for interstate.

We'll see.

Sorry to hijack your thread...Your fiberglass is looking good. I can't wait to see the end project. I've tried to envision where you're headed, without much luck.

-dave

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...nowadays people are so intellectually lazy and lethargic that they can't build ANYTHING with their hands. They'll spend hours watching whiny people marooned on an island, but won't spend a second adding anything to the world. -weconway
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PostPosted: Sun Aug 03, 2008 11:25 pm 
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I'd rock a scooter with this engine!
http://www.youtube.com/watch?v=SeUMDY01uUA
100cc ferrari 312 flat 12 replica!

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PostPosted: Sat Nov 22, 2008 10:45 am 
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Sorry for the mess. Here are the progress photos in order.

http://home.earthlink.net/~miatav9/index.html


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PostPosted: Sat Nov 22, 2008 10:48 am 
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....


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Last edited by Miatav8,MstrASE,A&P,F on Sat Nov 22, 2008 10:54 am, edited 1 time in total.
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