Rans S21 - Performance Numbers?

Explorer

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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

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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.

 
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Explorer

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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 ULSTitan XIO-340
Engine power/rpm100 hp@ 5800 rpm180 hp @ 2700 rpm
Gross weight1320 lb1320 or 1800 lb
Wing loading9.36 lbs/sq ft12.77 lbs/sq ft
Empty weight820 lb985 lb
Useful load500 lb815 lb
Wingspan28 ft28 ft
Wing area141 sq ft141 sq ft
Length22.41 ft22.41 ft
Cabin width46.5 in46.5 in
Baggage24 cubic ft/80 lb24 cubic ft/120 lb
Fuel43.5 gal/261 lb43.5 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 ULSTitan XIO-340
Cruise speed 75% power104 kt135 kt
Rate of climb850 ft/min1500 ft/min
Landing roll325 ft375 ft
Takeoff roll325 ft380 ft
Service ceiling12,500 ft14,000 ft
Stall speed clean40 kt43 kt
Stall speed with flaps33 kt35 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

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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.

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

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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.