Robert,
I had the same vision about 5 years ago. I designed and built a very
lightweight Aluminum trailer to haul around my lightweight sports cars (Amphi is
the heaviest, the others are a Lotus 7 and Mini Cooper). I designed a single
torsion axle trailer since that proved to be more than adequate for the loads
envisioned. I was able to get the actual unladen weight of the trailer down to
around 500lbs. I hate the idea of having to have a giant pig of a tow vehicle
just to haul lightweight vehicles around!
My only caution is don't think you are going to save any money by building it
yourself. Aluminum is pretty expensive stuff..... But it is gratifying to have
an optimized design that performs well.
Gary Schulz
-----Original Message-----
From: Robert [mailto:rjv@drakebuilders.com]
Sent: Tuesday, November 19, 2002 9:47 PM
To: Amphicar Lovers
Subject: [amphicar-lovers] trailer
Since I have always loved sports cars and race cars, I am obsessed with
small and light. The fact that the Amphicar fits this criteria had a lot to
do with my first
purchase of one. If it would have been big, fat and heavy, I would not even
have considered it. I have been borrowing car trailers from friends when I
have needed one. But I can't stand how big and heavy the typical car hauler
is. It is fine when it comes time to haul the typical 2 1/2 ton American
car, but to haul the 2350 lb Amphi? Many owners haul with trailers that are
almost as heavy as the Amphicar itself. And the gas-guzzler monster to pull
the whole rig.
My dream is to design and build the smallest and lightest trailer the club
has ever seen. And don't think I'm forgetting about safety! That is the most
important part of the dream! I have been thinking and studying every trailer
example I have seen for a number of years. Celina has always been a great
spot to see lots of different concepts. This year I saw a car hauler (not
owned by an Am phi group member) that was very small, and of all things
"single axle". Everyone I've ever talked to about trailer says "Single axle
is no good for hauling cars. It is dangerous. What if you were to have a
blow-out? You should be happy pulling 250-300 lbs more for the added
security. You sure don't want to wreck that beauty."
Logic tells me that with the proper tires, a blow-out is very unlikely. And
if it were to happen, a couple of knowledgeable trailer people have told me
that the fear of "violent side-to-side movement" is simply untrue. If the
trailer is loaded properly and the weight distribution is right, the trailer
will continue to go straight, just like the laws of physics say that it
will. A single axle commonly is rated to carry 3500 lbs. Someone even
mentioned 4200 lbs in Lovers. 2350 lbs for the Amphi, 700-800 lbs for a
steel trailer, 400-500 lbs for an aluminum one. We're not even close to the
max. But I guess that a spare tire is now in order! Actually, double axle
does not delete the need for a spare. I've spoken to lots of trailer experts
that have told me that a no-pressure tire on a double-axle will fail in a
big way if driven on. The big chunks of rubber will probably waste the
fender! And maybe the towed vehicle might be damaged?
To avoid an accident, either slow down, stop, or maneuver. Simple physics
states that the more mass that you have moving, the more energy you have
stored. And it takes more energy to stop more mass. And in a accident, I'd
rather have a 3000 lb rig behind me than a 5000 lb one. One must remember
that the mass wants to continue moving; and the more it weighs, the harder
it pushes. Light vehicles also corner better. That is one of the reasons why
race car designers will almost do anything to save another pound. Remember
that any body of mass wants to continue in a straight line. The more mass,
the more energy it takes to alter the straight path the mass wants to go.
And lighter cars stop faster. If you don't believe it, just compare the
stopping distances of light and heavy sports cars, trucks, SUVs,
sedans.....lighter always stops quicker.
Now you will need a tow vehicle that is rated to pull only 3000 lbs. And
simple physics stated that is takes less energy to move a lighter mass. The
drag coefficient is a factor, but it is safe to say that a lighter vehicle
takes less energy to accelerate and maintain forward motion, so it will get
better mileage. The trailer and vehicle on the trailer are part of the body
of mass, so the lighter the better.
I think that everything points to the fact that "Less is More". I'd be
interested to hear comments.
Rob Vondracek
'64 red
[Non-text portions of this message have been removed]
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