Hi from Canada - Page 2 - Fiberglass RV


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Old 04-30-2008, 10:46 PM   #15
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I was thinking about the aero-dynamics of that thing... Looks the side winds COULD very well be an issue no matter what it weighs, too many rounded corners on the bottom half of the trailer.
Thanks Doug, I've given some thought to that as well. One of the things Formula*F1 builders tried until it was disallowed because it worked too well was to create a reverse air foil under their cars by getting rid of the flat bottom,*installing*rails and rounding it out to about a 22 degree departure zone at*the*rear, counter balancing the lift*created*by*the*round*top*of*the*car.*Problem* with*this*trailer concept*drawing though*is*that*the*rear*is*too*small*to*do*much in that regard I think and*
might*not*work without doing some serious air damming along the sides,*although*
there*is*some*area to work with behind the wheels. I'll look at that, thanks.
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Old 04-30-2008, 10:56 PM   #16
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The pointy rear end of the trailer should help minimize rear drag I think. Also on something this light I am thinking
motorcycle wheels or similar.

Douglas Keister Photo Gallery
Look for image 48 of the 572 photos in this category, number [b]MM0061.
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Originally posted by Photo #MM0061 caption
[b]Rarest of the rare. This [b]1935 Bowlus Papoose (only four are known to exist) is a mere eleven feet six inches in length, six feet wide, seven feet high and weights in at seven hundred pounds. Like the Road Chief, the Papoose is entered from the fore end.
I just noticed a similarity in your design to this trailer.
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Old 04-30-2008, 11:31 PM   #17
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Thanks Frederick, sorry I can't take credit for the posted egg shaped concept trailer, it did draw my eye however and it's my reason for posting here.

Interesting that the Bowlus*Papoose weighs in so low in comparision to most
trailers. The height*of*that*trailer in relation to width and weight would worry me in
cross wind*situations*though.*Aluminum*skin*is*good*I*th ink*but*carbon*fiber*and*
kevlar over an aluminum skeleton may bring the weight down to almost half of
the Bowlus P imo. I like the placement of the wheels and door, and your posting
got me thinking of whether or not slightly standing rails along the trailer surface
would add something to the aerodynamics*of*the*trailer,*something*present*car *
builders*seem to limit*other*than*on*the unseen roof lines*of*taller*vehicles.
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Old 05-01-2008, 07:49 PM   #18
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ANYONE GOT A CLUE as to what Ken's talkin' 'bout??
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Old 05-01-2008, 08:15 PM   #19
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Aluminum skin is good I think but [b]carbon fiber and kevlar over an aluminum skeleton may bring the weight down to almost half of the Bowlus P
OR, mold the body out of Fiberglass, doing away with a skeleton entirely. That will really bring the weight down.

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I like the placement of the wheels and door, and your posting got me thinking of whether or not [b]slightly standing rails along the trailer surface would add something to the aerodynamics of the trailer, something present car builders seem to limit other than on the unseen roof lines of taller vehicles.
You mean like on the hood of the 2008 Chrysler Sebring?
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Old 05-01-2008, 08:15 PM   #20
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Did you read his first post on the first page Doug? Ken wants to build a lightweight trailer. Beyond that... the technical stuff is beyond me....
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Old 05-01-2008, 08:56 PM   #21
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Fiberglass is heavy compared to some other forms of skin.

I believe Ken is not only looking at the shape of the object in regard to reducing drag, but also the drag across the surface. Some automotive roofs have longitudinal strips that channel the air, although they may have been placed primarily to protect the surface from cargo. Others, like large van roofs, have channels molded into the rooftop to create strength which also help air flow.

Sailboats found that creating a smooth surface in the hull so the water would flow easily wasn't as effective as waxing the surface so a layer of water stuck to it. The hull to water friction is greater than water to water friction, so the waxed surface moves with less resistance.
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