Cool airplane-based 3-wheel vehicle build on Hemmings

Stumbled on a cool airplane-based 3-wheeled vehicle build on the Hemmings blog tonight, and it’s for sale.

This thing is really friggin cool. Execution of the nose is a bit weak, but… I really like the layout.

Now I want to find a damaged four-place single-engine low-wing plane and do that myself. Two ways to get reverse, really – use the GL1500 drivetrain like that guy did as-is (I’d want Megasquirt and taller gearing, though), or do a through-the-road hybrid system with the hybrid system on the front wheels, and implementing reverse. That allows one to use the GL1200 fuel injected driveline instead – less displacement, lower cylinder count, etc., etc.

With a GL1500 megasquirted, I’m thinking it’d get around 70-75 highway, 40-50 city.

With a GL1200 FI and a hybrid system, 75-85 mpg highway, 60-90 city depending on how well the hybrid system is tuned.

Weight would be in the 1200-1500 pound ballpark I think, both engines are in the 90-100 hp ballpark (the GL1500 was all about more torque), so you’d be looking at 0-60 times in the 5-7 second ballpark, top speeds probably 140-150 mph (quite low drag), although you won’t want to go that fast.

And, it’d be a more practical layout than my main 3-wheeler project idea if executed properly – 4 seats plus some (not much) cargo room, instead of 1 normal seat, 1 barely usable seat, and less cargo room. Downside is, production would be less practical – it ain’t cheap to build things this light new. Piper wants $301,500 for an Archer TX – even if you go with the “half of the plane price goes to the lawyers” rule, and even if you knock $100k off for not needing all the FAA certs and the Lycoming engine and all, you’re still looking at $50k.


Thoughts on my three-wheel vehicle project

For a while now, I’ve been planning a tadpole (also known as reverse trike) three-wheel vehicle that would have tandem seating, an enclosed cabin, and would achieve 156+ miles per US gallon on the highway by using a diesel engine.

I’ve even bought a 654 cc twin-cylinder Ruggerini diesel engine for this project. Here’s the problem though.

That diesel will get me in the ballpark of 16-20 hp. While that will be more than enough to achieve cruising speed, 16 hp won’t get me acceptable acceleration, and even 20 hp will be painful. In addition, the driveline will be rather long, due to having the transmission behind the engine (and a fair distance away to avoid fouling the oil filter), and then the rear wheel behind that.

So, my question to you is… should I abandon the diesel route, and go to a 300 cc single-cylinder fuel injected gasoline engine from a scooter (which means CVT)? Continue reading “Thoughts on my three-wheel vehicle project”