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  #41  
Old 05-14-2012, 09:09 AM
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Saying no to the Jayco.. just can't do it. Particularly the 10y, as with the 8' box it's just too small. Plus, that's a lot of money to drop on another camper, and once I had the bikes unloaded I'd just be bummed I had a smaller camper. There are others on the market as well, but all pushing the $10k mark, which is way more than I want to spend.

But here's an E-2: http://denver.craigslist.org/rvs/2960228907.html

Here's a gazunga huge Starcraft: http://denver.craigslist.org/rvs/2988939921.html

A Forest River http://denver.craigslist.org/rvs/2994176538.html

another ridiculously huge one http://denver.craigslist.org/rvs/3014262399.html

If money, space, and practicality weren't constraints, I'd like to go this route though for $15k. http://denver.craigslist.org/rvd/2988471040.html this could be the next phase, presuming the whole family is into bikes in 4-5 years.


For now, I'm going to stick with what we got, and work on getting a new axle with 5x150mm hubs and M14 studs. Then build up a new frame & do a box swap.. plan 1 above.
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  #42  
Old 05-14-2012, 11:14 AM
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On all of those models it looks like the axle is in the middle of the box and the hitch end of the frame is extended for the cargo platform. That looks to make for a lot of tongue weight. Am I missing something? I would expect the axle to move forward as the trailer gets longer.
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  #43  
Old 05-14-2012, 11:29 AM
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It still has to tow right unladen, though. Nak, you may be in the market for airbags.
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  #44  
Old 05-14-2012, 01:52 PM
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Help me with the math here... What multiplier would I use against bike weights, to calculate that bike's change in tongue weight? What's the TWM (tongue weight multiple?). I realize the bike's position on the tongue is also a factor, so presuming I could potentially do 4 bikes that's a separate variable for each; TWMa, TWMb, TWMc, and TWMd.

Bike*TWM = change in tongue weight, resulting from the bike.

So what I need to do is predetermine what I want my tongue weight to be unloaded (or with 1 propane and 1 battery), then estimate my TWM variables for each bike. Then I can work through scenarios loading from 1 to 4 bikes and calculate their net effect on tongue weight. Seems simple enough, right?
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  #45  
Old 05-14-2012, 02:08 PM
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A, B, C, and D are in order of how I'd load them. Not sure if I'd get to 4, but this exercise will help answer if that's even attainable. Also I am guessing 150 as my starting tongue weight, assuming 1 propane tank and 1 battery on the tongue (which could change, if necessary) I'm going to start with the following guesses:

TWMa = .61
TWMb = .72
TWMc = -.35
TWMd = .80

I could also estimate some bike weight variables..

Bike A = 240 my 250 XCF-w
Bike B = 110 Gavin's 50
Bike C = 185 Gavin's 80, when Violet gets his 50
Bike D = 250 My 450, when MIchele gets my 250

Putting all of that into a calculator, it seems very possible to stay within my receiver hitch's limit of 650 pounds tongue weight. My current slide-in ball thing says 500 pounds though, that's a better target anyway. Here's a calculator to see how this works out.
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File Type: xls tongue_weight_calculator.xls (34.0 KB, 30 views)
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  #46  
Old 05-14-2012, 02:14 PM
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So far my first thought is move the 50 pound battery to under the bench seat in the camper, behind the axle. Or, under the trailer somehow (Red Chili style!). As I add bikes, the tongue starts to look pretty heavy and I'm guessing that 100 pounds is still enough weight to safely pull it empty?
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  #47  
Old 05-14-2012, 02:56 PM
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Your TWM should be based on the distance from the axle. A bike over the axle will not affect tongue weight. As the bike moves away from the axle it creates a moment about the axle which can be resolved into a force at the hitch.
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  #48  
Old 05-14-2012, 04:08 PM
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Quote:
Originally Posted by 60wag View Post
Your TWM should be based on the distance from the axle. A bike over the axle will not affect tongue weight. As the bike moves away from the axle it creates a moment about the axle which can be resolved into a force at the hitch.
Agreed, so do you have a way to more accurately calculate that? Or better guesses than

TWMa = .61
TWMb = .72
TWMc = -.35
TWMd = .80

??
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  #49  
Old 05-15-2012, 09:15 AM
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If you are carrying two bikes, this setup might be the most simple with the existing trailer:

http://denver.craigslist.org/mcd/2990474425.html

Maybe adding just the 50 or 80cc bikes to the trailer would be much easier due to their low weights?
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  #50  
Old 05-15-2012, 10:13 AM
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^That's pretty cool, and a good price. I might pick one up.
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