What does my Fiber Stream Weigh? - Page 3 - Fiberglass RV


View Poll Results: Can you guess my Travelling Weight?
2000 to 2100 pounds 3 10.00%
2100 to 2200pounds 1 3.33%
2200 to 2300 pounds 0 0%
2300 to 2400 pounds 1 3.33%
2400 to 2500 pounds 1 3.33%
2500 to 2600 pounds 2 6.67%
2600 to 2700 pounds 4 13.33%
2700 to 2800 pounds 2 6.67%
2800 to 2900 pounds 4 13.33%
2900 to 3000 pounds 5 16.67%
3000 to 3100 pounds 1 3.33%
3100 to 3200 pounds 1 3.33%
3200 to 3300 pounds 0 0%
3300 to 3400 pounds 4 13.33%
3400 to 3500 pounds 1 3.33%
Voters: 30. You may not vote on this poll

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Old 03-28-2006, 06:11 PM   #29
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Name: Brian
Trailer: Boler (B1700RGH) 1979
Alberta
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Quote:
...Near the top it is 78" because the "Child's Upper Bunk" measures 27" x 78", with a 2" thick mattress.
Thanks for the clarification, and the reminder that there is also (in some Fiber Streams) an upper bunk running across the width of the trailer at the front.
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Old 03-29-2006, 01:32 PM   #30
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Now I'm really curious. Frederick, do you know how wide and long (and perhaps how thick) the leaves are?
The leaves are 1/4" thick and 1-3/4" wide.
The longest leaf is 22-1/2", the next is 17", the next is 13", and the shortest is 10-1/2"
(this was measured along the curve)
The direct length between mounting bolt centerlines is 21".
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1978 Fiber Stream 16 named "Eggstasy" & 1971 Compact Jr. named "Boomerang"
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Old 03-29-2006, 01:47 PM   #31
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The brake size is also indicative of axle series and thus potential capacity. With the 12" wheel size, I would guess 7" brakes, but that doesn't sound big enough for 3500 lb of "stopping capacity" (which would normally suggest 10" diameter by 2.25" wide drums).
The Brake Drums are 8" diameter by 2" wide.
I also found a partially decomposed stick-on label on the center of each axle tube:
(styleized TN logo) Trade Na****s Axle C****on, Elkhart, Indiana
(The number of asterisks (*) are completely arbitrary on my part)
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Old 03-29-2006, 08:23 PM   #32
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Trailer: Boler (B1700RGH) 1979
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I'll have to do some measuring when I get home, but I think the Fiber Stream's springs are normal for the same series of axle I have in my Boler, which are good for 3500 lb/pair in 4-leaf configuration. The width sounds right, the eye-to-eye spacing is actually a bit shorter than mine (probably to allow closer axle spacing, but it makes them stiffer), and I don't know about the thickness. Maybe they actually put in two 3500-lb axles, which seems like overkill.

It's unfortunate sometimes that the RV world in centred around Elkhart, Indiana: it makes it hard to find an obscure axle company when "Elkhart" doesn't narrow the search. Dexter, for instance, is there.

I can see the 8"x2" brakes having just enough capacity for 3500 lb per pair of trailer weight, given the standards of the trailer industry. I find my 10"x2.25" drums work fine under normal conditions, but can't provide enough force to do their share at maximum braking; that's apparently okay with the trailer component companies. The Fiber Stream's small overall tire diameter will help somewhat, putting the brakes at less of a leverage disadvantage than they would be with a larger tire, but the end result is about the same as the Boler:
  • B1700 stock tire
    • size approx 205/78-14: nominal overall diameter 676 mm (26.6")
    • drum is 10" (254 mm) diameter
    • braking force at tread is 38% of force at drum surface
  • Fiber Stream stock tire
    • size 4.80x12: nominal overall diameter 20.5" (521 mm)
    • drum is 8" (203 mm) diameter
    • braking force at tread is 39% of force at drum surface
  • Fiber Stream upgraded
    • tire size 5.30x12; nominal overall diameter 21.9" (557 mm)
    • drum is 8" (203 mm) diameter
    • braking force at tread is 37% of force at drum surface
The 12" tire specs are from a randomly chosen website: Trailer Parts Superstore. And yes, I know I ignored the compression of the tire and thus overestimate the effective diameter and brake disadvantage.

It seems strange to me to put so much more load capacity in the axles than the tires they depend on. In the end, it doesn't matter how hard the brakes can grab if the tire slips because it isn't carrying enough of the trailer weight, and it doesn't matter that one axle could hold the whole trailer up if only one pair of the tires can't. It's a good thing it seems to work better than it sounds like it should!
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