Saturday, January 18, 2014
Saturday, December 21, 2013
Warning! You need a third degree of backyard engineering do build one of these!
To carry cargo on hills that force you to slow down to about 3 mph or less , with out getting off and pushing a bike up thte hills, I would chooose a trike. But I hate the feel of a trike (having to lean into the turns) and I can push a bike easyer than a trike.
I am not sure that this kind of trike would be easier at very slow speeds than a two wheel cargo bike. But it does appear that it would have better traction when cornering fast.
I do not know if the shocks are needed when using center point steering.
I also think it would be better to use the two support arm method, even if just to distribute the weight off of the one single bearing.
This two sided one is better, but is more complex.
Ultimate tilting trike Leaning cargo trikes
Wednesday, December 4, 2013
Friday, September 6, 2013
I am a third degree backyard engineer so don't ask foolish questions about "how do I know if these bikes are strong enough".
When I climb hills very slowly because of the cargo, I can really feel the wheel flop created by too much trail. A steep steer angle and small wheel combined with short trail adds up to easy maneuverability. I really like to climb hills with cargo.
For a long nose bike I recommend no more than 2.3" trail, with a steer angle less than 60 degrees. But for a short bike more than 70 degrees with 1.3" to 1.7" trail is best.
If your working with a BMX fork you have to make compromises.
see trail calculators http://www.kreuzotter.de/english/elenk.htm
|A steer angle 68 degrees with a 1.5" rake is 2.4" trail. but a steer angle of 70.2 degrees will do a trail of 2", so 69.7 degrees will do a 2.1" trail, close enough. It would work better with more rake. Like maybe 2".|
The reason these long bikes are so popular is that trailers can yank your bike around when full of heavy cargo.
How to motorize a heavy bike:
a good cartridge head set or this one?
Tools to think about, but Not all these tools are needed:
Head tubes, steer tubes and a disc brake tab jig .
Construction of Utility bike (the prototype)
A simple jig to hold the drop-outs should be mounted on 1/2" steel flat bar.
Some bikes will need new Heavy Duty drop outs (these also need a derailleur hanger) with disc tabs built in on the rear. Disc brakes will allow you to use a smaller rear wheel for an effectively lower gear.
a protractor square is essentieal for determining the head tube angle
|This is a frame alignment guage|
fork alignment tools
Wednesday, August 7, 2013
This is a 12 volt truck tail light with 56 large L.E.D.s
Just look at truck tail lights (with the brake light on) when they are 2000 feet ahead of you. The other way to be seen on dark day is to wear a 'day-glow' shirt.