I received an email from Hector Alberto who is from Australia and is a reader of this blog. He sent links to some YouTube videos of the tadpole trike and quad he has built. I am sharing them here for the world to see.
trike & quad ride on trails:
quad ride to park:
I wrote back to Hector asking him if he would send some pictures and share anything about his homemade trike and quad he cared to. Here is his reply:
The trike frame Is made of aluminium and lots of bolts.
For the steering system I’ve used the cheap 17mm ATV stub axle found on eBay and its respective end rod bolts (I was trying to understand how steering works in real).
I want to mention that with those pieces it was easy to make adjustments about angles related with the Ackerman law.
I used 20” BMX front plastic wheels. The original axle and bearings have been replaced by high rpm bearings to fit on the ATV stub axle.
The handlebars were attached using a 90 degree metal bracket between the stub axle and the handlebars. In general the trike use to work fine, but eventually the brake system mounted on the aluminium frame just fell apart.
Front sprocket 42t, freewheel 3 speeds
This picture shows the quad frame standing up when I was painting it.
I decided to go with a quad in order to help my wife bring our son along with her. The Quad measurements are 185cm long X 85cm wide. Yes, it is really a compact size when one takes into consideration that there are two people travelling on it. It has a COASTER BRAKE in the left rear wheel and the right rear wheel has an electric hub motor and a 160mm disc brake system. The quad is single speed. It has no front wheel brakes.
The trike conversion kits are so expensive in Australia, so I’ve been hunting for a used one. I got one old tricycle for Au$40. It came with one wheel traction (left one). Once I cut off the back part of the tricycle I went to a friend who welded it as I required. It includes a bottom bracket shell (found it as well on eBay).
The quad frame is using the same steering system as the trike.
The electric hub motor wheel is a 250w 36v “front wheel” for bicycles. It is mounted in the rear right side of the quad. This configuration allows the use either of the rear wheel power drives individually. When the rear wheel with pedal power loses traction you can put extra power in the electric hub motor wheel just by using the manual throttle as needed.
The average travel speed 15-20km/hr. Max speed tested with 98kg aprox., 27km/hr. Realistically, this is not a fast machine but it works excellent for the purpose; plus, my wife and my son love it.
I hope this help others to improve their designs.
A FREE GIFT awaits you!