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Old 08-27-12, 09:05 AM   #1
dclifton
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converting my b.o.b. yak trailer to an electric push trailer.

Can anyone point me in the right direction as to how to go about converting my b.o.b. yak trailer into an electric trailer to assist with uphills and headwinds? Are there companies or individuals out there that do these conversions.Helpful websites.Ect?thanks in advance.
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Old 08-27-12, 05:28 PM   #2
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Originally Posted by dclifton View Post
Can anyone point me in the right direction as to how to go about converting my b.o.b. yak trailer into an electric trailer to assist with uphills and headwinds? Are there companies or individuals out there that do these conversions.Helpful websites.Ect?thanks in advance.
It's pretty easy to just drop a front conversion kit motor into the Bob - I've tried it, only problem is that it is a 16" wheel, and it is hard to find a decent motor that is wound fast enough (higher rpm per volt) for that small wheel. The old Crystalyte 404 motor was ideal, but is not produced any more. The Crystalyte 209 is also a smaller, very fast motor which could be built into a 16" wheel. I've got a 209 in a 451 wheel, slightly bigger than BMX 406 sized wheel on a Dahon folder and it is extremely fast (but not very torquey). I did try a 404 in my Bob and it was good, but could have issues with traction, if you don't put the batteries in the trailer, which robs the Bob of cargo capacity to some degree. One of the faster Bafang BPM motors would be good I imagine with lots of torque as well. You are going to want a wind in the "over 400 rpm at 48 volt range", as high as possible. The Bafang BPM Code 10 is 390 rpm at 48Volts, and will get you into the low 20s (mph) range at 48 volts, in a 20" wheel, less in a 16" wheel.

You are going to want to consider your desired speed, and translate that into rpm of your wheel size, and then consider the voltage you will operate at and the rpm per volt of the motor. Truthfully, the 404 was a great motor for the Bob - I wish I could buy a few more on ebay or something. You could move to 72volt format, which would help a lot with the motor speed,on the small wheel. I'd try to stick to 48V and find a motor that is fast.

Last edited by chvid; 08-31-12 at 12:57 PM.
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Old 09-01-12, 10:07 PM   #3
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I've got a 500W Crystalyte 406 front hub laced into a 16"wheel (with 2" BigApple) on my BOB yak.
With the 36V Lit-Ion battery mounted to the trailer deck (tent and sleeping bag etc.) my "E-BOB" is a great hauler and pusher trailer.
I just got back from a 4day trip and was able to charge at the site the 1st nite but had no way of charging the second and 3rd nites.
I needed the motor for a couple of steep climbs out of the place we were (Sooke PotHoles), so needed to use the battery as sparingly as possible on the ride in, worked out without a problem.
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File Type: jpg Preparing #2 001.jpg (102.4 KB, 73 views)
File Type: jpg Tour #2 July 6-9 003.jpg (101.0 KB, 74 views)
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Old 09-01-12, 11:51 PM   #4
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I've got a 500W Crystalyte 406 front hub laced into a 16"wheel (with 2" BigApple) on my BOB yak.
With the 36V Lit-Ion battery mounted to the trailer deck (tent and sleeping bag etc.) my "E-BOB" is a great hauler and pusher trailer.
I just got back from a 4day trip and was able to charge at the site the 1st nite but had no way of charging the second and 3rd nites.
I needed the motor for a couple of steep climbs out of the place we were (Sooke PotHoles), so needed to use the battery as sparingly as possible on the ride in, worked out without a problem.
Trikin', that's a great setup with the E-BOB. How much weight can the E-BOB carry? How much weight do you have in the pictures on it?
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Old 09-02-12, 10:46 AM   #5
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I'd be guessing, could be 50+lbs, rated for 60lbs. I tried paring down the weight on my last trip, smaller lighter tent but all I did was create a less than comfortable rest. Then I thought, being August, I could leave out the warmer clothes, all that accomplished was being too cold in the evening and a shorter stay at a great mountain campsite.
I've had some call the E-BOB a cheater, but I'd rather have those extra comforts that I left out for a more enjoyable tour.
I'm going to continue to use my E-BOB to enhance my touring experiance, for years to come.
Attached Images
File Type: jpg Tour #2 July 6-9 008.jpg (101.9 KB, 57 views)
File Type: jpg TOUR June 8 & 9 2011 009.jpg (92.9 KB, 55 views)
File Type: jpg Tour #2 July 6-9 010.jpg (100.3 KB, 61 views)
File Type: jpg On The Road Again... June 2011 002.jpg (105.0 KB, 57 views)
File Type: jpg ON THE ROAD AGAIN.....Chapter2 001.jpg (96.0 KB, 57 views)
File Type: jpg Load Prep For Tour2 MINI- TOT 003.jpg (101.1 KB, 59 views)

Last edited by Trikin'; 09-02-12 at 10:54 AM.
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Old 03-15-16, 10:43 PM   #6
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I realize that this thread is well over 3 years old and generally I dont like to "necro-post" and bring them back from the dead, BUT I am in the planning stage of this exact build now in 2016. I would like to say thanks to all for the original posts.
As far as I can tell all of this info is still very much valid, the Bob wheel is still 16" so it's all good. I'm hoping to benefit from the advances in battery and motor construction that have occurred since 2012 and have a E-Bob of my own soon. I'm doing this build to assist me with a loaded surly LHT, I'm hoping to move some cargo to the trailer and get this old guy over the hills a bit quicker so I can tour for a few more years : ) I'll post again as I progress. Again thanks all.
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Old 12-29-16, 07:48 PM   #7
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Did you ever get your E-Bob built? I am looking at doing the exact same thing right now so these threads never really die as there is always someone who can benefit from them.

Those that have built one, where do you recommend ordering your motor hub and batteries kit from?

This trailer will be splitting time behind an Trice Trike and a 1988 Schwinn touring bike. =)

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I realize that this thread is well over 3 years old and generally I dont like to "necro-post" and bring them back from the dead, BUT I am in the planning stage of this exact build now in 2016. I would like to say thanks to all for the original posts.
As far as I can tell all of this info is still very much valid, the Bob wheel is still 16" so it's all good. I'm hoping to benefit from the advances in battery and motor construction that have occurred since 2012 and have a E-Bob of my own soon. I'm doing this build to assist me with a loaded surly LHT, I'm hoping to move some cargo to the trailer and get this old guy over the hills a bit quicker so I can tour for a few more years : ) I'll post again as I progress. Again thanks all.
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