Rans S21 - Performance Numbers?

[Explorer]

Has anyone compared the performance numbers of the S21 to the Super Cub?

I popped into to see a fellow who's 2/3rds the way thru his build using an IO 340 -180 Hp. With the wing design will it produce similar numbers to the Super Cub?

 

[Bartman]

the S21 in this review has the 180 hp engine option so the article should have the info you are looking for. I googled it because I had never heard of it. looks like a lot of fun.

KITPLANES Flight Review: RANS S-21

This story originally ran in KITPLANES.

www.avweb.com

 

[Explorer]

Thx!

In terms of wing area the Super Cub definitely has more wing. There wouldn't be anyone who out there that has flown both?

Piper PA-18 Super Cub

• Length: 22 feet 7 inches.
• Wingspan: 35 feet 2 1/2 inches.
• Height: 6 Feet 8 1/2 inches (on wheels, not floats)
• Wing Area: 178.5 feet.
• Airfoil: USA 35B.
• Aspect Ratio: 7:1.
• Empty Weight: 930 pounds (on wheels, not floats)
• Maximum Takeoff Weight: 1,760 pounds on floats (with gross weight increase kit up to 2,100 lb)

S-21 Outbound Specifications

	Rotax 912 ULS	Titan XIO-340
Engine power/rpm	100 hp@ 5800 rpm	180 hp @ 2700 rpm
Gross weight	1320 lb	1320 or 1800 lb
Wing loading	9.36 lbs/sq ft	12.77 lbs/sq ft
Empty weight	820 lb	985 lb
Useful load	500 lb	815 lb
Wingspan	28 ft	28 ft
Wing area	141 sq ft	141 sq ft
Length	22.41 ft	22.41 ft
Cabin width	46.5 in	46.5 in
Baggage	24 cubic ft/80 lb	24 cubic ft/120 lb
Fuel	43.5 gal/261 lb	43.5 gal/261 lb or 45 gal w/optional larger header tank.

When gross weight is limited to the Light Sport maximum of 1320 pounds, the Titan version of the S-21 effectively becomes a single-place airplane.

S-21 Outbound Performance

	Rotax 912 ULS	Titan XIO-340
Cruise speed 75% power	104 kt	135 kt
Rate of climb	850 ft/min	1500 ft/min
Landing roll	325 ft	375 ft
Takeoff roll	325 ft	380 ft
Service ceiling	12,500 ft	14,000 ft
Stall speed clean	40 kt	43 kt
Stall speed with flaps	33 kt	35 kt

With 180 hp, the Titan XIO-340 offers much better performance than the 100-hp Rotax 912 ULS, but it’s also more expensive.

 

[Flyingj]

the S21 in this review has the 180 hp engine option so the article should have the info you are looking for. I googled it because I had never heard of it. looks like a lot of fun.

KITPLANES Flight Review: RANS S-21

This story originally ran in KITPLANES.

www.avweb.com

I thought the same thing Bartman. In fact, so much that I just ordered a kit. I had the opportunity to visit the factory this week for a grand tour and demo flight. Obviously, I was very impressed.

 

[Bartman]

well make sure you post a build thread here for our peeps to follow. i'll be curious to see how it all goes together.