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Discussion Starter · #1 ·
Hi!

Me and my friend are planning to build a tuk-tuk, based off an old scooter (stearing wheel, front wheel, front part of frame), with a welded back of stainless steel bars. The purpose will be for cargo.

Somewhere along the lines of this project:

Unlike this guy tho, we're thinking of using two hub motors, and avoid the shaft altogether.

1. Any thoughts on this idea?

2. Any tips on good deals for scooter wheels (somewhere around 16", preferably thick ones)?
(Something like this QS Motor 16*3.5inch 48V50KPH 3000W 260 40H V1.12 E-Motorcycle Wheel Hub Motor | eBay , but way cheaper and somewhere around 1500W)

I'll post some photos eventually!

Cheers!
 

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1. They're death traps if you hit the brakes hard rounding a corner. Southern Asia places no value on the lives of its lower-caste occupants or drivers, which is why you see them in use there and nowhere else.
 

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My father built a trike out of a Volkswagen Beetle 30 years ago. A less refined version of this:
Wheel Tire Plant Vehicle Fuel tank


It was fine to drive right up until you tried to turn it and... it would not do it.

Would this be something you would register and take on public roads?
 

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Discussion Starter · #4 ·
In those "prognosises" that you both made there, are you assuming that the shaft does not have differential steering? Like here:

In any case, with two hub motors in the back, the idea was to bypass this problem -- in theory making the turning unproblematic, as they are independent of each other.

Am I missing something?

Thanks for your feedback.
 

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The issue is not the tires scuffing on the corners, it's the turning all being handled by the front wheel, especially if you are hauling cargo.

3 wheeled ATVs used to be quite popular, but routinely killed people due to combining steering and braking (or acceleration). 4 wheels is a lot more stable.
Tire Land vehicle Wheel Automotive tire Vehicle


That being said, if this is going to be a slow mover, that's less of an issue. So where will it be driven? Private land? Just trying to understand the parameters is all. And you of course can build whatever you like, regardless of if I think it's a good idea.
 

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El. Puerh, You should go ahead with your project. I'm using a QS 138 mid drive on my project. I haven't try others but I shopped alot before buying. I have nothing bad to say about quality, but their aftersales service is non existant. You should buy from a retailer who can provide good assistance. QS also offer many controllers, some are better then others.

The Votol is not fully mappable.

Where are you located?
 

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So...assuming that you're using two independent motors for the wheels-any reason not to create a Tadpole-style trike, with a free-flowing fixed rear wheel, then use the controllers on the two forward wheels in order to steer? A decent amount of cargo could still be carried, and it would be far safer. Admittedly you would then have to take Ackerman angles into account to avoid wheel scrub, but turning and stopping would be far less dangerous...

For an introductory treatise on steering geometry, I recommend the Link below, it will explain why so many on the Forum are worried for you:



And a quick design summary of Delta vs Tadpole:


Having said that, the same designer has-on his own Designs page-several Delta trikes that worked well. Note however, that the single-wheel steer designs are both wide-stance and low-stance, while Tuk-tuks are rather the opposite. If your heart is set on a single-steer Delta (and there are some advantages to its mechanical simplicity) I would recommend:

1) Wide, low stance to prevent overspill upon turning/braking and to keep all weight firmly within the 'magic triangle'.
2) More weight towards the rear (same reason).
3) Really good back brakes and a weaker front brake (same reason).

Best of luck!
 
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