I am having some fun kicking around the idea of little plane inspired by the Scooter designed around a 35 hp industrial V-twin with an Ace redrive. I am thinking aluminum-tube-and-gusset fuselage and tail and possibly still wood wings all covered in Oratex. Here's what they LAA performance spreadsheet gives me.
(Some factors have the standard value and/or the formula to the right of the entry. Note that I have increased parasitic drag to account for an open cockpit and other bits and bobs hanging out.)
Crew weight 250 lbs
Fuel + baggage weight 50 lbs
A/C empty weight 350 lbs
Total weight 650 lbs
Stall speed (flaps up) Vs1 42 mph
Climb airspeed 54.6 mph
Climb airspeed 80.1 ft/sec
CLmax 1.5
CL at 1.3 Vs 0.89
Wing area required 96.0 ft²
Propeller efficiency at take-off 70 70%
Propeller efficiency in the climb 75 75%
Propeller efficiency in the cruise 85 85%
Cd (profile) 0.01 0.01
Cd (parasite) 0.03 0.015
Aspect ratio 6
Induced drag factor K 1.2
Wing span 24.0 feet
Mean wing chord 4.00 feet
Selected rated shaft power 35.0 BHP
Effective flat plate area 4.10 ft²
Take off run 523 feet
Rate of climb at 1.3 Vs 845 feet per minute
Max level speed 102 mph
Cruise speed at 75% power 92 mph
Cruise speed at 55% power 83 mph
Flaps up stall speed 42 mph
Glide descent rate at 1.3 Vs 488 feet per minute
I think something like this could be a lot of fun, perhaps designed for big and tall pilots and with optional doors for cold weather.